Liftable desk
By designing a liftable table, using lifting column components and linkage mechanisms, flexible adjustment of the height and length of the desktop panel components is achieved, solving the problem that existing tables cannot be adjusted according to user needs, and improving the practicality and user experience of the table.
Patent Information
- Application Number
- CN202421560235.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-03
AI Technical Summary
The existing table has a fixed height and length, which cannot be adjusted according to user needs, resulting in less practicality.
A liftable table including a table panel assembly, a lifting column assembly and a base frame is designed. The height adjustment of the table panel assembly is achieved through the combination of outer columns, inner columns and drivers; at the same time, the length adjustment of the table is achieved through the design of the bottom frame, the first moving plate, the second moving plate and the middle plate.
Users can adjust the height of the desktop panel components according to their own height and adjust the length of the table according to the number of items placed, improving the user experience and the practicality of the table.
Smart Images
Figure CN222828262U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tables, in particular to a liftable table. Background Art
[0002] Currently, most tables on the market, such as dining tables, desks, and office desks, are placed directly on the ground, and their height and length are relatively fixed. The height and length of the table cannot be adjusted according to the needs of the users. For example, users of different heights require tables of different heights. The length of the table cannot be adjusted according to the number of items placed, which makes the table generally not practical.
[0003] Therefore, further improvements are necessary. Utility Model Content
[0004] The purpose of the utility model is to provide a liftable table with simple structure, convenient adjustment, good user experience, beautiful appearance and strong practicality, so as to overcome the shortcomings of the prior art.
[0005] A liftable table designed for this purpose is characterized in that it includes a desktop panel assembly, a lifting column assembly and a base frame, the lifting column assembly includes an outer column, an inner column and a driver, the outer column is sleeved on the outer side of the inner column, the driver is arranged in the lifting column assembly, the driver drives the outer column to be connected, the outer column is connected to the desktop panel assembly, and the inner column is fixed on the base frame, the driver drives the outer column to move upward relative to the inner column to drive the desktop panel assembly to rise, and the desktop panel assembly drives the outer column to move downward relative to the inner column when pressed; the desktop panel assembly includes a bottom frame, a first movable plate, a second movable plate and a middle plate, the first movable plate and the second movable plate are movably arranged on the bottom frame to open and close each other, the middle plate is arranged between the first movable plate and the second movable plate, a linkage mechanism is arranged between the middle plate and the first movable plate and the second movable plate, when the first movable plate and the second movable plate are opened to each other, the linkage mechanism drives the middle plate to move upward so that the first movable plate, the second movable plate and the middle plate form a desktop, when the first movable plate and the second movable plate are closed to each other, the linkage mechanism drives the middle plate to move downward so that the first movable plate and the second movable plate form a desktop.
[0006] It also includes a controller, which controls the connected driver. When the controller is pressed, the driver extends and drives the outer column to move upward relative to the inner column. When the controller is pressed and presses the desktop panel assembly, the desktop panel assembly drives the outer column to move downward relative to the inner column to compress the driver.
[0007] The driver includes a driving cylinder body and a piston rod which is telescopically arranged on the driving cylinder body. The driving cylinder body is fixed on the inner column. One end of the piston rod is connected to the outer column. When the piston rod extends upward, it drives the outer column to move upward relative to the inner column. When the desktop panel assembly drives the outer column to move downward relative to the inner column, the outer column drives the piston rod to compress downward.
[0008] Guide rails are respectively arranged on both sides of the bottom frame, first sliding members are respectively arranged on both sides of the first movable plate, second sliding members are respectively arranged on both sides of the second movable plate, a sprocket assembly is arranged in the guide rails, the sprocket assembly includes sprockets arranged at both ends of the guide rails and a chain arranged between the two sprockets, the first sliding member is installed on the first side of the chain, the second sliding member is installed on the second side of the chain, the first sliding member and the second sliding member are slidably arranged on the guide rails through the chain to open and close each other, so that the first movable plate and the second movable plate are movably arranged on the bottom frame to open and close each other.
[0009] The linkage mechanism includes a sliding shaft arranged on the first sliding member and the second sliding member, and a linkage plate arranged at the bottom of the middle plate, a track groove is arranged on the linkage plate, the track groove includes an upper movable groove, an intermediate groove and a lower movable groove, the intermediate groove and the lower movable groove are respectively located at the lower ends of the upper movable groove, the upper movable groove is connected with the lower movable groove through the intermediate groove, and the sliding shaft corresponds to the intermediate groove and the lower movable groove one by one; when the first movable plate and the second movable plate are opened to each other, the sliding shaft slides from the upper movable groove through the intermediate groove into the lower movable groove to drive the middle plate to move upward, and when the first movable plate and the second movable plate are closed to each other, the sliding shaft slides from the lower movable groove through the intermediate groove into the upper movable groove to drive the middle plate to move downward.
[0010] The lower movable groove is provided with a stop zone, an intermediate position and a transition zone, the intermediate position is connected to the intermediate groove, and limit strips are respectively rotated at both ends of the linkage plate corresponding to the position of the lower movable groove; when the sliding shaft slides from the upper movable groove through the intermediate groove into the lower movable groove, the sliding shaft pushes the limit strip to rotate in the first direction, and the sliding shaft slides into the transition zone; when the sliding shaft is located in the transition zone, the first movable plate and the second movable plate respectively move toward the middle plate, so that the sliding shaft slides from the transition zone through the intermediate position to the stop zone, and the sliding shaft pushes the limit strip to rotate in the second direction; when the sliding shaft is located in the stop zone, the first movable plate and the second movable plate respectively move away from the middle plate, so that the sliding shaft slides from the stop zone to the intermediate position, and the linkage plate moves downward under the action of gravity, so that the sliding shaft slides from the lower movable groove through the intermediate groove into the upper movable groove, thereby realizing the mutual closure of the first movable plate and the second movable plate.
[0011] The first limit protrusion and the second limit protrusion are respectively arranged at the two ends of the linkage plate corresponding to the positions of the lower movable groove; when the sliding shaft pushes the limit bar to rotate in the first direction, the first limit protrusion acts on the limit bar, and when the sliding shaft pushes the limit bar to rotate in the second direction, the second limit protrusion acts on the limit bar.
[0012] The middle plate is provided with guide pins, and the bottom frame is provided with guide holes. When the middle plate moves up and down, the guide pins slide up and down on the guide holes.
[0013] The first movable plate is provided with a first positioning hole, and the second movable plate is provided with a first positioning pin. When the first movable plate and the second movable plate are closed to each other, the first positioning pin is positioned and inserted into the first positioning hole.
[0014] The first movable plate and the second movable plate are respectively provided with flanges on both sides. When the first movable plate and the second movable plate are closed to each other, the flanges cover the middle plate.
[0015] The table of the utility model is provided with outer columns, inner columns and a driver, so that the height of the desktop panel assembly can be adjusted. The user can adjust the height of the desktop panel assembly according to his or her own height. In addition, by providing a bottom frame, a first movable plate, a second movable plate and a middle plate, the user can adjust the length of the table according to the number of items placed, thereby meeting the usage requirements of different users, greatly improving the user experience, and further improving the practicality of the table. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure when the table is raised and shortened in one embodiment of the utility model.
[0017] Figure 2 It is a schematic diagram of the overall structure when the table is lowered and shortened in one embodiment of the utility model.
[0018] Figure 3 It is a schematic diagram of the overall structure of a table when it is elevated and extended in one embodiment of the utility model.
[0019] Figure 4 It is a schematic diagram of the overall structure of a table when it is lowered and extended in one embodiment of the utility model.
[0020] Figure 5 It is a schematic diagram of the exploded structure of a table in one embodiment of the utility model.
[0021] Figure 6 It is a cross-sectional view of a table when it is raised and shortened in one embodiment of the utility model.
[0022] Figure 7 It is a cross-sectional view from another direction when the table is raised and shortened in one embodiment of the utility model.
[0023] Figure 8 It is a cross-sectional view of the third position when the table is raised and shortened in one embodiment of the utility model.
[0024] Fig. 9 It is a schematic diagram of the matching structure of the linkage plate and the sliding shaft in one embodiment of the utility model.
[0025] Fig.10 It is a partial structural schematic diagram of a table when it is raised and shortened in one embodiment of the utility model.
[0026] Fig.11 It is a partial structural schematic diagram of another position when the table is raised and shortened in one embodiment of the utility model.
[0027] Fig.12 It is a schematic diagram of the assembly structure of the guide rail, the first sliding member, the second sliding member and the sprocket assembly in one embodiment of the utility model. DETAILED DESCRIPTION
[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0029] See also Figure 1-Figure 12 The liftable table comprises a desktop panel assembly 1, a lifting column assembly 2 and a base frame 3. The lifting column assembly 2 comprises an outer column 4, an inner column 5 and a driver 6. The outer column 4 is sleeved on the outside of the inner column 5. The driver 6 is arranged in the lifting column assembly 2. The driver 6 drives the outer column 4 to connect. The outer column 4 is connected to the desktop panel assembly 1. The inner column 5 is fixed on the base frame 3. The driver 6 drives the outer column 4 to move upward relative to the inner column 5 to drive the desktop panel assembly 1 to rise. When the desktop panel assembly 1 is pressed, the outer column 4 is driven to move downward relative to the inner column 5 to make the desktop panel assembly 1 descend; the desktop panel assembly 1 comprises a bottom frame 7, a first movable plate 8, a second movable plate 9 and a middle plate 10. The bottom frame 7 is fixed on the outer column 4. The first movable plate 8 and the second movable plate 9 are arranged on the bottom frame 7 for mutual opening and closing activities, the middle plate 10 is arranged between the first movable plate 8 and the second movable plate 9, and a linkage mechanism is arranged between the middle plate 10 and the first movable plate 8 and the second movable plate 9. When the first movable plate 8 and the second movable plate 9 are opened with each other, the middle plate 10 is driven to move upward by the linkage mechanism, and the heights of the first movable plate 8, the second movable plate 9 and the middle plate 10 are flush, so that the first movable plate 8, the second movable plate 9 and the middle plate 10 form a desktop, and the length of the table is extended at this time. When the first movable plate 8 and the second movable plate 9 are closed with each other, the linkage mechanism drives the middle plate 10 to move downward, and the middle plate 10 moves to below the first movable plate 8 and the second movable plate 9, so that the first movable plate 8 and the second movable plate 9 form a desktop, and the length of the table is shortened at this time.
[0030] It also includes a controller (not shown in the figure), which controls the connection driver 6. The controller is set at the bottom of the desktop panel assembly 1. When the controller is pressed, the driver 6 extends and drives the outer column 4 to move upward relative to the inner column 5 to drive the desktop panel assembly 1 to rise. After the desktop panel assembly 1 reaches a suitable position, the controller can be released to complete the adjustment; when the controller is pressed and the desktop panel assembly 1 is pressed (by hand), the desktop panel assembly 1 drives the outer column 4 to move downward relative to the inner column 5 to make the desktop panel assembly 1 descend and compress the driver 6. After the desktop panel assembly 1 reaches a suitable position, the controller can be released to complete the adjustment; the controller structure is a prior art and will not be described in detail here.
[0031] The driver 6 includes a driving cylinder body 34 and a piston rod 11 which is telescopically arranged on the driving cylinder body 34. The driving cylinder body 34 is an air cylinder or an oil cylinder. The driving cylinder body 34 is fixed on the inner column 5. One end of the piston rod 11 is connected to the outer column 4. When the piston rod 11 extends upward, it drives the outer column 4 to move upward relative to the inner column 5. When the desktop panel assembly 1 drives the outer column 4 to move downward relative to the inner column 5, the outer column 4 drives the piston rod 11 to compress downward.
[0032] The driving cylinder 34 is provided with a switch valve, and the controller controls the switch valve. When the controller is pressed, the switch valve is opened, and the piston rod 11 is in an active state.
[0033] The side of the inner column 5 is provided with a roller 37 . When the outer column 4 is raised or lowered, the inner side surface thereof rolls with the roller 37 , thereby reducing the friction between the outer column 4 and the inner column 5 .
[0034] Guide rails 12 are provided on both sides of the bottom frame 7, first sliding members 13 are provided on both sides of the first movable plate 8, second sliding members 14 are provided on both sides of the second movable plate 9, a sprocket assembly is provided in the guide rail 12, the sprocket assembly includes sprockets 15 provided at both ends of the guide rail 12 and a chain 16 provided between the two sprockets 15, the first sliding member 13 is installed on a first side 35 of the chain 16, the second sliding member 14 is installed on a second side 36 of the chain 16, the first sliding member 13 and the second sliding member 14 are slidably provided on the guide rail 12 through the chain 16 to open and close each other, so that the first movable plate 8 and the second movable plate 9 are movably provided on the guide rail 12 to open and close each other. On the bottom frame 7; when the user moves the first movable plate 8, the first movable plate 8 drives the chain 16 to move through the first sliding member 13, and the chain 16 drives the second sliding member 14 to move, and the moving direction of the second sliding member 14 is opposite to that of the first sliding member 13, and the second sliding member 14 drives the second movable plate 9 to move, so that the first movable plate 8 and the second movable plate 9 are opened and closed with each other; the user can also realize the mutual opening and closing of the first movable plate 8 and the second movable plate 9 by moving the second movable plate 9; the user only needs to move one of the first movable plate 8 and the second movable plate 9 to realize the mutual opening and closing of the first movable plate 8 and the second movable plate 9, which is easy to operate.
[0035] The linkage mechanism includes a sliding shaft 17 arranged on the first sliding member 13 and the second sliding member 14, and a linkage plate 18 arranged on both sides of the bottom of the middle plate 10. A track groove 19 is arranged on the linkage plate 18. The track groove 19 includes an upper movable groove 20, an intermediate groove 21 and a lower movable groove 22. The intermediate groove 21 and the lower movable groove 22 are respectively located at the lower ends of the upper movable groove 20. The upper movable groove 20 is connected with the lower movable groove 22 through the intermediate groove 21. The sliding shaft 17 corresponds to the intermediate groove 21 and the lower movable groove 22 one by one; when the first movable plate 8 and the second movable plate 9 are opened to each other, the sliding shaft 17 slides from the upper movable groove 20 through the intermediate groove 21 into the lower movable groove 22 to drive the middle plate 10 to move upward. When the first movable plate 8 and the second movable plate 9 are closed to each other, the sliding shaft 17 slides from the lower movable groove 22 through the intermediate groove 21 into the upper movable groove 20 to drive the middle plate 10 to move downward.
[0036] The lower movable groove 22 is provided with a stop zone 23, an intermediate position 24 and a transition zone 25, the intermediate position 24 is connected to the intermediate groove 21, and the two ends of the linkage plate 18 are respectively rotated to set limit strips 26 corresponding to the position of the lower movable groove 22; when the sliding shaft 17 slides from the upper movable groove 20 through the intermediate groove 21 into the lower movable groove 22, the sliding shaft 17 pushes the limit strip 26 to rotate in the first direction A (upward), that is, the sliding shaft 17 passes over the limit strip 26, the sliding shaft 17 slides into the transition zone 25, and the limit strip 26 rotates downward to reset, at this time, the first movable plate 8 and the second movable plate 9 are fully opened, and at this time, there is a gap between the first movable plate 8 and the second movable plate 9 and the middle plate 10 respectively, so it is necessary to move the first movable plate 8 and the second movable plate 9 toward the middle plate 10 respectively (that is, the first movable plate 8 and the second movable plate 9 are closed to each other), when the first movable plate 8 and the second movable plate 9 move toward the middle plate 10 respectively, the sliding shaft 17 moves from the transition zone 2 5 slides to the stop zone 23 through the intermediate position 24 (at this time, there is no gap between the first movable plate 8, the second movable plate 9 and the middle plate 10 respectively), and the sliding shaft 17 pushes the limit bar 26 to rotate in the second direction B (upward), that is, the sliding shaft 17 passes over the limit bar 26, and then the limit bar 26 rotates downward to reset; when the sliding shaft 17 is located in the stop zone 23 (at this time, the first movable plate 8 and the second movable plate 9 are opened to each other), if the first movable plate 8 and the second movable plate 9 are to be closed to each other, first move the first movable plate 8 and the second movable plate 9 away from the middle plate 10 respectively, so that the sliding shaft 17 slides from the stop zone 23 to the intermediate position 24, and the linkage plate 18 moves downward under the action of gravity, so that the sliding shaft 17 slides from the lower movable groove 22 (intermediate position 24) through the intermediate groove 21 into the upper movable groove 20, and at the same time, the linkage plate 18 drives the middle plate 10 to move downward, and then the first movable plate 8 and the second movable plate 9 can be closed to each other.
[0037] A first limit protrusion 27 and a second limit protrusion 28 are respectively provided at the two ends of the linkage plate 18 corresponding to the positions of the lower movable groove 22; when the sliding shaft 17 pushes the limit bar 26 to rotate in the first direction A, the first limit protrusion 27 acts on the limit bar 26 in a limiting manner, and when the sliding shaft 17 pushes the limit bar 26 to rotate in the second direction B, the second limit protrusion 28 acts on the limit bar 26 in a limiting manner. This structure prevents the linkage plate 18 from moving downward under the action of gravity when the sliding shaft 17 passes through the intermediate position 24, so that the sliding shaft 17 can smoothly slide from the transition area 25 through the intermediate position 24 to the stop area 23.
[0038] A guide pin 29 is provided at the bottom of the middle plate 10, and a guide hole 30 is provided on the bottom frame 7. When the middle plate 10 moves up and down, the guide pin 29 slides up and down on the guide hole 30 to play a guiding role and prevent the middle plate 10 from deflecting.
[0039] A first positioning hole 31 is provided on one side of the first movable plate 8, and a first positioning pin 32 is provided on one side of the second movable plate 9. When the first movable plate 8 and the second movable plate 9 are closed to each other, the first positioning pin 32 is positioned and inserted into the first positioning hole 31, thereby playing a role in mutual positioning of the first movable plate 8 and the second movable plate 9; a first gasket 38 is sleeved on the outer periphery of the first positioning pin 32. When the first movable plate 8 and the second movable plate 9 are closed to each other, the first gasket 38 is located between the first movable plate 8 and the second movable plate 9, thereby playing a buffering role.
[0040] A second positioning pin 39 is provided on one side of the middle plate 10, and a second positioning hole 40 is provided on the other side. A second gasket 41 is sleeved on the outer periphery of the second positioning pin 39. When the first movable plate 8 and the second movable plate 9 are opened to each other and the middle plate 10 moves upward, the second positioning pin 39 is positioned and inserted into the first positioning hole 31, and the first positioning pin 32 is positioned and inserted into the second positioning hole 40, so that the first movable plate 8 and the second movable plate 9 respectively play a role of mutual positioning with the middle plate 10. The second gasket 41 is located between the first movable plate 8 and the middle plate 10, and the first gasket 38 is located between the middle plate 10 and the second movable plate 9, which plays a buffering role.
[0041] The first movable plate 8 and the second movable plate 9 are respectively provided with flanges 33 on both sides, and the flanges 33 are arranged obliquely. When the first movable plate 8 and the second movable plate 9 are closed to each other, the flanges 33 cover both sides of the middle plate 10, and the first movable plate 8 and the second movable plate 9 are covered on the middle plate 10, so that the middle plate 10 cannot be seen, which plays a role in aesthetics.
[0042] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A liftable table, characterized in that: The invention comprises a desktop panel assembly (1), a lifting column assembly (2) and a base frame (3), wherein the lifting column assembly (2) comprises an outer column (4), an inner column (5) and a driver (6), wherein the outer column (4) is sleeved on the outer side of the inner column (5), and the driver (6) is arranged in the lifting column assembly (2), the driver (6) drives and connects the outer column (4), and the outer column (4) is connected to the desktop panel assembly (1), and the inner column (5) is fixed on the base frame (3), and the driver (6) drives the outer column (4) to move upward relative to the inner column (5) to drive the desktop panel assembly (1) to rise, and when the desktop panel assembly (1) is pressed, the outer column (4) is driven to move downward relative to the inner column (5); the desktop panel assembly (1) comprises a bottom frame (7), a first movable plate (8), and a first movable plate (9). The invention relates to a first movable plate (8) and a middle plate (10), wherein the first movable plate (8) and the second movable plate (9) are movably arranged on the bottom frame (7) so as to open and close each other, and the middle plate (10) is arranged between the first movable plate (8) and the second movable plate (9). A linkage mechanism is arranged between the middle plate (10) and the first movable plate (8) and the second movable plate (9). When the first movable plate (8) and the second movable plate (9) are opened to each other, the middle plate (10) is driven to move upward by the linkage mechanism so that the first movable plate (8), the second movable plate (9) and the middle plate (10) form a desktop. When the first movable plate (8) and the second movable plate (9) are closed to each other, the linkage mechanism drives the middle plate (10) to move downward so that the first movable plate (8) and the second movable plate (9) form a desktop.
2. The liftable table according to claim 1, characterized in that: The device also includes a controller, which controls a connected driver (6). When the controller is pressed, the driver (6) extends and drives the outer column (4) to move upward relative to the inner column (5). When the controller is pressed and presses the desktop panel assembly (1), the desktop panel assembly (1) drives the outer column (4) to move downward relative to the inner column (5) to compress the driver (6).
3. The liftable table according to claim 2, characterized in that: The driver (6) comprises a driving cylinder (34) and a piston rod (11) which is telescopically arranged on the driving cylinder (34). The driving cylinder (34) is fixed on the inner column (5). One end of the piston rod (11) is connected to the outer column (4). When the piston rod (11) extends upward, it drives the outer column (4) to move upward relative to the inner column (5). When the desktop panel assembly (1) drives the outer column (4) to move downward relative to the inner column (5), the outer column (4) drives the piston rod (11) to be compressed downward.
4. The liftable table according to claim 1, characterized in that: Guide rails (12) are respectively arranged on both sides of the bottom frame (7), first sliding members (13) are respectively arranged on both sides of the first movable plate (8), and second sliding members (14) are respectively arranged on both sides of the second movable plate (9). A sprocket assembly is arranged in the guide rail (12), and the sprocket assembly comprises sprockets (15) arranged at both ends of the guide rail (12) and a chain (16) arranged between the two sprockets (15). The first sliding member (13) is mounted on a first side (35) of the chain (16), and the second sliding member (14) is mounted on a second side (36) of the chain (16). The first sliding member (13) and the second sliding member (14) are slidably arranged on the guide rail (12) via the chain (16) so as to be mutually opened and closed, so that the first movable plate (8) and the second movable plate (9) are mutually opened and closed and movably arranged on the bottom frame (7).
5. The liftable table according to claim 4, characterized in that: The linkage mechanism comprises a sliding shaft (17) arranged on the first sliding member (13) and the second sliding member (14), and a linkage plate (18) arranged at the bottom of the middle plate (10); a track groove (19) is arranged on the linkage plate (18); the track groove (19) comprises an upper movable groove (20), an intermediate groove (21) and a lower movable groove (22); the intermediate groove (21) and the lower movable groove (22) are respectively located at two ends below the upper movable groove (20); the upper movable groove (20) and the lower movable groove (22) are connected through the intermediate groove (21); The sliding shaft (17) corresponds to the middle groove (21) and the lower movable groove (22) respectively; when the first movable plate (8) and the second movable plate (9) are opened to each other, the sliding shaft (17) slides from the upper movable groove (20) through the middle groove (21) into the lower movable groove (22) to drive the middle plate (10) to move upward; when the first movable plate (8) and the second movable plate (9) are closed to each other, the sliding shaft (17) slides from the lower movable groove (22) through the middle groove (21) into the upper movable groove (20) to drive the middle plate (10) to move downward.
6. The liftable table according to claim 5, characterized in that: The lower movable groove (22) is provided with a stop zone (23), an intermediate position (24) and a transition zone (25); the intermediate position (24) is connected to the intermediate groove (21); and limit strips (26) are respectively provided at both ends of the linkage plate (18) corresponding to the position of the lower movable groove (22); when the sliding shaft (17) slides from the upper movable groove (20) through the intermediate groove (21) into the lower movable groove (22), the sliding shaft (17) pushes the limit strip (26) to rotate in a first direction (A), and the sliding shaft (17) slides into the transition zone (25); when the sliding shaft (17) is located in the transition zone (25), the first movable plate (8) and the second movable plate (9) respectively move toward the middle plate (10), The sliding shaft (17) slides from the transition zone (25) through the intermediate position (24) to the stop zone (23), and the sliding shaft (17) pushes the limit bar (26) to rotate in the second direction (B); when the sliding shaft (17) is located in the stop zone (23), the first movable plate (8) and the second movable plate (9) respectively move away from the middle plate (10), so that the sliding shaft (17) slides from the stop zone (23) to the intermediate position (24), and the linkage plate (18) moves downward under the action of gravity, so that the sliding shaft (17) slides from the lower movable groove (22) through the intermediate groove (21) into the upper movable groove (20), thereby realizing the mutual closure of the first movable plate (8) and the second movable plate (9).
7. The liftable table according to claim 6, characterized in that: A first limiting convex point (27) and a second limiting convex point (28) are respectively provided at positions corresponding to the lower movable groove (22) at both ends of the linkage plate (18); when the sliding shaft (17) pushes the limiting bar (26) to rotate in a first direction (A), the first limiting convex point (27) acts on the limiting bar (26) to limit the position; when the sliding shaft (17) pushes the limiting bar (26) to rotate in a second direction (B), the second limiting convex point (28) acts on the limiting bar (26) to limit the position.
8. The liftable table according to claim 1, characterized in that: A guide pin (29) is provided on the middle plate (10), and a guide hole (30) is provided on the bottom frame (7). When the middle plate (10) moves up and down, the guide pin (29) slides up and down on the guide hole (30).
9. The liftable table according to claim 1, characterized in that: The first movable plate (8) is provided with a first positioning hole (31), and the second movable plate (9) is provided with a first positioning pin (32); when the first movable plate (8) and the second movable plate (9) are closed to each other, the first positioning pin (32) is inserted into the first positioning hole (31) for positioning.
10. The liftable table according to claim 1, characterized in that: Flanged edges (33) are respectively provided on both sides of the first movable plate (8) and the second movable plate (9); when the first movable plate (8) and the second movable plate (9) are closed to each other, the flanged edges (33) cover the middle plate (10).