A lifting desk

Abstract

This utility model relates to the field of desks and discloses a height-adjustable desk. It includes a lifting frame, a desk panel, and a spring-loaded locking pin assembly. The desk panel has four spaced-apart docking posts at its bottom, and the lifting frame has four spaced-apart docking slots at its top. The four docking posts are inserted into their corresponding slots. Two sets of spring-loaded locking pin assemblies are installed on the lifting frame. Each set of spring-loaded locking pin assemblies is suitable for locking two corresponding docking posts, making it difficult for the docking posts to be pulled out of the docking slots. The spring-loaded locking pin assembly includes a knob and two locking pins. Both locking pins are connected to the knob, which is rotatably connected to the lifting frame and exposed to the air for rotation. Rotating the knob will cause the two locking pins to move synchronously towards or away from each other. This utility model allows locking two docking posts by rotating a single knob, reducing operation steps, achieving semi-automation during locking, improving the convenience of assembly, and enhancing the stability of the desk panel and lifting frame after installation.

Description

Technical Field

[0001] This utility model relates to the field of table technology, and more specifically, to a height-adjustable office desk. Background Technology

[0002] The adjustable desk consists of a lifting frame and a tabletop. For ease of transport, both the lifting frame and tabletop are disassembled into multiple parts, which users purchase online and then assemble themselves. Currently, the tabletop is connected to the lifting frame by multiple bolts. During assembly, the lifting frame is assembled first, then the tabletop is placed upside down on the ground, and the lifting frame is placed on top. Users must align the bolt holes on the lifting frame with those on the tabletop, ensure the stability of the lifting frame to prevent tipping, and use tools to tighten multiple bolts to secure the lifting frame and tabletop together. This makes assembling the tabletop and lifting frame quite inconvenient. Utility Model Content

[0003] To address at least one of the aforementioned problems, this utility model provides a height-adjustable office desk, comprising a height-adjustable frame, a tabletop, and a resilient locking pin assembly. The tabletop has four spaced-apart docking posts at its bottom, and the height-adjustable frame has four spaced-apart docking slots at its top. The four docking posts are inserted into their corresponding docking slots. Two sets of the resilient locking pin assembly are installed on the height-adjustable frame. Each set of the resilient locking pin assembly is adapted to lock two corresponding docking posts, making it difficult for the docking posts to be pulled out of the docking slots. The resilient locking pin assembly includes a knob and two locking pins. Both locking pins are connected to the knob, which is rotatably connected to the height-adjustable frame and exposed to the air for rotation. Rotation of the knob will cause the two locking pins to move synchronously towards or away from each other. A locking slot is provided on the side wall of each docking post, and the locking pin is inserted into the locking slot to lock the docking post within the docking slot.

[0004] Optionally, the two opposite sidewalls of the tabletop are symmetrically provided with dovetail grooves, and a dovetail strip is fixedly connected to the top of the docking column, the dovetail strip being slidably inserted into the dovetail groove.

[0005] Optionally, the lifting frame includes lifting table legs, a crossbeam frame, and a side beam frame. Two lifting table legs are symmetrically spaced apart. The crossbeam frame is located between the two lifting table legs and connected to the two lifting table legs. Two side beam frames are provided, and the two side beam frames are respectively connected to the two lifting table legs. The docking groove is opened on the side beam frame, and two sets of elastic locking pin assemblies are respectively installed on the two side beam frames.

[0006] Optionally, the side beam frame has a cavity inside, which communicates with the docking groove. The side beam frame is stamped and bent to form a first support plate and a second support plate, both of which are located inside the cavity. The docking post is located on the side of the second support plate away from the first support plate. Guide sleeves are welded to the first and second support plates. The locking pin is slidably inserted into the guide sleeve. When locking the docking post, one side of the locking pin is located inside the guide sleeve, and the other side is inserted into the locking slot.

[0007] Optionally, the resilient locking pin assembly further includes a drive spring, which is inserted into the guide sleeve. One end of the drive spring abuts against the side of the locking pin near the first support plate, and the other end abuts against the first support plate, so as to drive the locking pin to tend to insert into the locking slot.

[0008] Optionally, the elastic locking pin assembly further includes a steel wire rope, and a synchronously rotating rope winding column is connected to the knob. One side of the rope winding column is inserted into the lifting frame and rotatably connected to the lifting frame. A rope-passing hole is opened on the outer wall of the rope winding column, through which the steel wire rope passes. Both ends of the rope winding column are respectively connected to two locking pins to drive the locking pins to move.

[0009] Optionally, the knob is sleeved on the rope winding post, and the knob is adapted to slide and connect with the rope winding post; a plurality of rotation limiting grooves are provided on the outer wall of the lifting frame near the knob, and a rotation limiting post is fixedly provided on the side of the knob near the lifting frame. The rotation limiting post is adapted to be inserted into any of the rotation limiting grooves so that the rotation of the knob is limited; when it is necessary to rotate the knob, a pulling force is applied to the knob to drive the knob to move relative to the rope winding post so that the rotation limiting post is pulled out from the limiting groove.

[0010] Optionally, one side of the rope-winding post is exposed to the air and connected to the knob. The top of the knob has a spline groove, and the outer wall of the rope-winding post is fixed with a spline. The spline is inserted into the spline groove so that the knob and the rope-winding post rotate synchronously. One end of the rope-winding post inserted into the spline groove has a mounting groove, and a tension spring is installed in the mounting groove. The other end of the tension spring is connected to the knob. When no tension is applied to the knob, the tension spring drives the rotation limiting post to be inserted into the limiting groove.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] 1. When assembling the table and the lifting frame together, simply rotate the knob to move the locking pin out of place, then insert the docking post into the docking slot, and then loosen the knob to insert the locking pin into the locking slot. Moreover, turning one knob can lock two docking posts, reducing the operation steps and improving the convenience of assembly.

[0013] 2. The docking column is assembled with the tabletop using dovetail strips and dovetail grooves. It can be assembled without tools, making it convenient. The dovetail grooves of the front and rear docking columns are symmetrically opened. Therefore, after the docking column is inserted into the docking groove, the tabletop will be restrained by the two dovetail strips and dovetail grooves when it moves back and forth. It is also limited in the left and right directions within the docking groove, and limited in the up and down directions by the locking pin. This makes the tabletop locked and limited in all directions, improving the stability of the tabletop and lifting frame after installation.

[0014] 3. The two locking pins are connected by the same steel wire rope, and the steel wire rope passes through the rope winding post. Therefore, turning the knob will drive the rope winding post to rotate, so that the steel wire rope is wound around the rope winding post, thereby driving the two locking pins to move synchronously. To unlock, simply turn the knob. When locking, as long as no force is applied to the knob, the rope winding post will rotate on its own under the action of the two drive springs. The locking is semi-automatic and easy to operate.

[0015] 4. Under normal circumstances, the knob, under the action of the tension spring, causes the rotation limit pin to be inserted into the rotation limit groove to form a self-locking mechanism. If no pulling force is applied to the knob, the knob cannot be rotated, which improves the stability in the locked state. During assembly, pull the knob and rotate the knob to drive the locking pin to move and make way. After releasing the knob, the rotation limit pin will be inserted into the corresponding rotation limit groove. At this time, it is not necessary to apply force to the knob continuously, freeing up the hands and making it easier for one person to assemble, and improving the convenience of assembly. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the height-adjustable desk in an embodiment of this utility model;

[0017] Figure 2 This is an exploded view of the tabletop and the connecting column in an embodiment of this utility model;

[0018] Figure 3 This is a structural diagram of the lifting frame in an embodiment of the present utility model;

[0019] Figure 4 This is a structural diagram of the side beam frame and elastic locking pin assembly in an embodiment of this utility model;

[0020] Figure 5 The explosion of the elastic locking pin assembly in the embodiment of this utility model Figure 1 ;

[0021] Figure 6 The explosion of the elastic locking pin assembly in the embodiment of this utility model Figure 2 ;

[0022] Figure 7 This is a partial cross-sectional view of an embodiment of the present utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Lifting frame; 11. Lifting table leg; 12. Crossbeam frame; 13. Side beam frame; 14. First sheet metal plate; 15. Second sheet metal plate; 151. Rotation limit groove; 16. Connecting groove; 17. First support plate; 18. Second support plate; 19. Guide sleeve; 2. Tabletop; 21. Connecting column; 22. Dovetail groove; 23. Dovetail strip; 3. Elastic locking pin assembly; 31. Knob; 311. Spline groove; 312. Rotation limit column; 313. Cover plate; 32. Locking pin; 33. Drive spring; 34. Steel wire rope; 35. Rope winding column; 351. Rope threading hole; 352. Mounting groove; 36. Clip sleeve; 37. Pin shaft; 38. Tension spring. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1-7 This application will be described in further detail.

[0025] The accompanying drawings of this utility model embodiment provide a coordinate system XYZ, where the positive direction of the X-axis represents the right, the negative direction of the X-axis represents the left, the positive direction of the Y-axis represents the front, the negative direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom.

[0026] This utility model embodiment provides a height-adjustable office desk, see reference. Figure 1 The height-adjustable desk includes a height-adjustable frame 1, a desk 2, and a spring-loaded locking pin assembly 3. The bottom of the desk 2 has four interlocking posts 21, which can be inserted into the height-adjustable frame 1. Two sets of spring-loaded locking pin assemblies 3 are installed on the height-adjustable frame 1. Each set of spring-loaded locking pin assemblies 3 is adapted to lock two corresponding interlocking posts 21, preventing the desk 2 from being easily pulled off the height-adjustable frame 1 along the insertion direction. Parts of the spring-loaded locking pin assembly 3 are rotatably connected to the height-adjustable frame 1, and are limited in position after rotation, allowing one person to operate and insert the interlocking posts 21 on the desk 2. Afterwards, the rotation limitation on the spring-loaded locking pin assembly 3 is released, allowing part of the spring-loaded locking pin assembly 3 to be inserted into the interlocking posts 21 to lock the desk 2 onto the height-adjustable frame 1.

[0027] Reference Figures 1 to 3The lifting frame 1 includes lifting table legs 11 (existing technology, specific structure not described), a crossbeam frame 12, and side beam frames 13. Two lifting table legs 11 are symmetrically spaced along the left-right direction. The crossbeam frame 12 is located between the two lifting table legs 11 and connected to them by bolts. Two side beam frames 13 are provided, each connected to one of the two lifting table legs 11 by bolts. Two sets of elastic locking pin assemblies 3 are respectively installed on the two side beam frames 13. The side beam frames 13 and the elastic locking pin assemblies 3 are pre-assembled into a module before leaving the factory; the user only needs to fix the side beam frames 13 and the lifting table legs 11 together with bolts (existing operations also use bolts to fix the side beam frames 13 to the lifting table legs 11, therefore no additional assembly steps are added). The following description uses the installation relationship of one set of side beam frames 13 and elastic locking pin assemblies 3 as an example.

[0028] Reference Figures 2 to 4 The side beam frame 13 includes a first sheet metal plate 14 and a second sheet metal plate 15. The first sheet metal plate 14 is a plate resembling the number "7", and the second sheet metal plate 15 is an "L"-shaped plate. The first sheet metal plate 14 is located on the side of the lifting table leg 11 away from the crossbeam frame 12. The side of the lifting table leg 11 near the crossbeam frame 12 is provided with bolts to fix the first sheet metal plate 14 and the lifting table leg 11 together. The second sheet metal plate 15 is located on the side of the first sheet metal plate 14 away from the lifting table leg 11. The first sheet metal plate 14 and the second sheet metal plate 15 are connected to form a cavity. The elastic locking pin assembly 3 is located in the cavity and is installed on the second sheet metal plate 15 to form a module for fixed connection with the first sheet metal plate 14. A connecting plate is bent downward on the side of the first sheet metal plate 14 near the second sheet metal plate 15. The second sheet metal plate 15 is fixedly connected to the connecting plate by bolts.

[0029] Two symmetrically spaced mating grooves 16 are provided on the top of the first sheet metal plate 14 along the front-to-back direction. The mating grooves 16 communicate with the cavity, and two corresponding mating posts 21 are inserted into the corresponding mating grooves 16 and into the cavity. A mating groove 16 that mates with the elastic locking pin assembly 3 is provided on the side of the two mating posts 21 that is close to each other.

[0030] Reference Figures 2 to 5The elastic locking pin assembly 3 includes a knob 31, two locking pins 32, two drive springs 33, and a steel wire rope 34. The knob 31 is rotatably mounted on the second sheet metal plate 15. The two locking pins 32 are located on the front and rear sides of the knob 31 and are slidably mounted on the second sheet metal plate 15. The two drive springs 33 drive the two locking pins 32 to insert into corresponding mating slots 16, locking the mating post 21 within the slots 16 and preventing it from being easily pulled out. The two ends of the steel wire rope 34 are connected to the two locking pins 32, and the steel wire rope 34 is also connected to the knob 31. Rotating the knob 31 causes the steel wire rope 34 to wind around, thereby causing the two locking pins 32 to move synchronously towards or away from each other. The knob 31 is exposed to the air for direct user operation.

[0031] Reference Figures 2 to 5 The second sheet metal plate 15 is stamped and bent to form a first support plate 17 and a second support plate 18, both of which are located within the cavity. Since a set of elastic locking pin assemblies 3 is provided with two locking pins 32, the first support plate 17 and the second support plate 18 are symmetrically provided in twos. The following description takes the cooperation structure of a first support plate 17, a second support plate 18, and a locking pin 32 as an example.

[0032] The second support plate 18 is located between the docking post 21 and the first support plate 17, with the first support plate 17 and the second support plate 18 spaced apart. Guide sleeves 19 are welded to the first support plate 17 and the second support plate 18. The second support plate 18 is fitted onto the guide sleeve 19, with one end of the guide sleeve 19 away from the docking post 21 abutting against the side of the first support plate 17 closest to the second support plate 18. This arrangement provides support on both sides of the guide sleeve 19, making it more stable. A drive spring 33 is located inside the guide sleeve 19, and a locking pin 32 is slidably inserted into the guide sleeve 19. One end of the drive spring 33 abuts against the side of the locking pin 32 closest to the first support plate 17, and the other end abuts against the first support plate 17, thus driving the locking pin 32 to tend to insert into the locking slot. When locking the docking post 21, one side of the locking pin 32 is located inside the guide sleeve 19, and the other side is inserted into the locking slot, with the wire rope 34 taut.

[0033] Reference Figures 2 to 5 A collar is welded onto the second sheet metal plate 15, and a bearing is installed inside the collar. A rope-winding post 35 is inserted into the bearing. One side of the rope-winding post 35 protrudes from the bearing and is exposed in the cavity, while the other side passes through the second sheet metal plate 15 and is located at the bottom of the sheet metal plate, connected to the knob 31, and rotates synchronously. A baffle ring is fitted and fixedly connected to the rope-winding post 35, and the baffle ring abuts against the top of the collar, making it difficult for the rope-winding post 35 to be pulled off the bearing.

[0034] Reference Figures 2 to 5A rope-passing hole 351 is provided on the outer wall of the rope-winding post 35, through which the wire rope 34 passes. A through-hole is provided on the side of the locking pin 32 away from the second support plate 18, through which the locking pin 32 passes. One end of the wire rope 34 is inserted into the through-hole and passes through the through-hole located on the side of the locking pin 32 away from the second support plate 18, and passes through the drive spring 33. A clamping sleeve 36 is fitted on the end of the wire rope 34 located on the locking pin 32 away from the second support plate 18. The outer diameter of the clamping sleeve 36 is larger than the diameter of the through-hole. After the clamping sleeve 36 is fitted onto the wire rope 34, it is pressed and deformed by pliers, thereby achieving a fixed connection with the wire rope 34. When knob 31 rotates the rope winding post 35, it causes the wire rope 34 to wind around the rope winding post 35. The locking pin 32 is pulled away from the docking post 21 by the locking head sleeve 36, disengaging from the locking slot to unlock. Similarly, the other end of the wire rope 34 pulls another locking pin 32 to unlock.

[0035] Reference Figures 2 to 7 The knob 31 is located at the bottom of the second sheet metal plate 15 and is fitted onto the rope winding post 35. A spline groove 311 is provided on the top of the knob 31. A spline is provided on one side of the rope winding post 35 at the bottom of the second sheet metal plate 15. The outer diameter of the spline is smaller than the outer diameter of the portion of the rope winding post 35 without the rope winding post 35, allowing the spline to pass smoothly through the bearing during assembly. The spline is inserted into the spline groove 311, and rotating the knob 31 causes the rope winding post 35 to rotate.

[0036] Multiple rotation limiting grooves 151 are provided on the outer wall of the second sheet metal plate 15 near the knob 31. The multiple rotation limiting grooves 151 are arranged at intervals around the rope winding column 35. A rotation limiting post 312 is fixedly provided on the side of the knob 31 near the lifting frame 1. The rotation limiting post 312 is suitable for being inserted into any rotation limiting groove 151 so that the rotation of the knob 31 is limited, forming a self-locking mechanism, which improves the stability when the docking column 21 is locked.

[0037] Reference Figures 2 to 7 The knob 31 is slidably connected to the rope post 35 along the axial direction of the rope post 35. Therefore, when the knob 31 needs to be rotated, a pulling force is applied downward to the knob 31 to drive the knob 31 to move relative to the rope post 35, so that the rotation limit post 312 is disengaged from the rotation limit groove 151, and then the knob 31 can be rotated.

[0038] Reference Figures 2 to 7In detail, the end of the rope winding post 35 inserted into the spline groove 311 has an installation groove 352, which extends through the rope winding post 35. The outer wall of the rope winding post 35 has a through-hole that communicates with the installation groove 352 and is located below the wire rope 34. A pin 37 is inserted into the pin hole, and the other end of the pin 37 is limited by a cotter pin (an existing standard part), preventing the pin 37 from being pulled out. A tension spring 38 is hooked onto the pin 37 and is located within the installation groove 352. The spline groove 311 extends through the knob 31, and a cover plate 313 is bolted to the bottom of the knob 31. A hook is fixedly installed on the cover plate 313, facilitating machining and assembly. The hook is located within the spline groove 311, and the end of the tension spring 38 furthest from the pin 37 is hooked to the hook. When no tension is applied to the knob 31, the tension spring 38 drives the rotation limit post 312 to be inserted into the limit groove.

[0039] Reference Figures 2 to 7 Under normal circumstances, when no force is applied to the knob 31, the knob 31, under the action of the tension spring 38, causes the rotation limit pin 312 to be inserted into the rotation limit groove 151 to form a self-locking mechanism. At this time, if no force is applied to the knob 31, the knob 31 cannot be rotated, which improves the stability in the locked state. During assembly, after pulling and rotating the knob 31 to drive the knob 31 to move the locking pin 32 to make way, the knob 31 is released, and the rotation limit pin 312 will be inserted into the corresponding rotation limit groove 151 again. At this time, it is not necessary to apply force to the knob 31 continuously, which frees up the hands, makes it easier for one person to assemble, and improves the convenience of assembly.

[0040] In this embodiment, the tabletop 2 is preferably a rectangular plate, with four connecting posts 21 located at the four right angles of the tabletop 2. Dovetail grooves 22 are symmetrically formed on both the front and rear outer walls of the tabletop 2, with two grooves spaced apart on the rear side and two spaced apart on the front side. Each connecting post 21 has a dovetail strip 23 integrally formed at its top, which slides into the dovetail groove 22. Both the connecting posts 21 and the dovetail grooves 22 are made from scrap materials, reducing resource waste. During assembly, the user simply slides the dovetail strip 23 into the dovetail groove 22.

[0041] The implementation principle of a height-adjustable desk according to an embodiment of this application is as follows: After the lifting frame 1 is assembled, it is placed squarely. Then, the knob 31 is pulled down, causing the rotation limit pin 312 to disengage from the rotation limit groove 151. The knob 31 is then rotated, causing the winding post 35 to rotate. The wire rope 34 is wound around the winding post, which in turn pulls the two locking pins 32 closer together to allow them to move. After the locking pins 32 are fully moved, the pulling force on the knob 31 is reduced, but the knob 31 is still unable to rotate. The knob 31 moves left, right, up, and down under the tension spring 38, and the rotation limit pin 312 inserts into the corresponding rotation limit groove 151, causing the knob 31 to self-lock and not rotate. Both elastic locking pin assemblies 3 operate in this manner, thus freeing up the hands. Finally, place the tabletop 2 above the lifting frame 1 and insert the corresponding docking post 21 into the corresponding docking slot 16. Then, pull down the knob 31 to disengage the rotation limit post 312 from the rotation limit slot 151. The rope winding post 35 will rotate on its own under the action of the two drive springs 33, and drive the knob 31 to rotate, so that the locking pin 32 is inserted into the locking slot for locking. When in the locked state, release the knob 31, and the knob 31 will move up and down left and right on the tension spring 38. The rotation limit post 312 will then insert into the corresponding rotation limit slot 151 for self-locking.

[0042] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.

[0043] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0044] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0046] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. A height-adjustable desk, characterized in that: The system includes a lifting frame (1), a tabletop (2), and a spring-loaded locking pin assembly (3). The tabletop (2) has four spaced-apart docking posts (21) at its bottom, and the lifting frame (1) has four spaced-apart docking slots (16) at its top. The four docking posts (21) are inserted into their respective docking slots (16). Two sets of the spring-loaded locking pin assembly (3) are installed on the lifting frame (1). Each set of the spring-loaded locking pin assembly (3) is adapted to lock two corresponding docking posts (21), making it difficult for the docking posts (21) to be pulled out of the docking slots (16). The component (3) includes a knob (31) and two locking pins (32). Both locking pins (32) are connected to the knob (31). The knob (31) is rotatably connected to the lifting frame (1) and is exposed to the air for rotation. After the knob (31) is rotated, it will drive the two locking pins (32) to move synchronously towards or away from each other. The side wall of the docking post (21) is provided with a locking slot. The locking pins (32) are inserted into the locking slot to lock the docking post (21) into the docking groove (16).

2. The height-adjustable desk according to claim 1, characterized in that: The tabletop (2) has dovetail grooves (22) symmetrically opened on two opposite side walls. The top of the docking column (21) is fixedly connected to a dovetail strip (23), which is slidably inserted into the dovetail groove (22).

3. The height-adjustable desk according to claim 1, characterized in that: The lifting frame (1) includes lifting table legs (11), crossbeam frame (12) and side beam frame (13). Two lifting table legs (11) are symmetrically spaced apart. The crossbeam frame (12) is located between the two lifting table legs (11) and connected to the two lifting table legs (11). Two side beam frames (13) are provided. The two side beam frames (13) are respectively connected to the two lifting table legs (11). The docking groove (16) is opened on the side beam frame (13). Two sets of elastic locking pin assemblies (3) are respectively installed on the two side beam frames (13).

4. The height-adjustable desk according to claim 3, characterized in that: The side beam frame (13) has a cavity inside, which is connected to the docking groove (16). The side beam frame (13) is stamped and bent to form a first support plate (17) and a second support plate (18). The first support plate (17) and the second support plate (18) are both located in the cavity. The docking post (21) is located on the side of the second support plate (18) away from the first support plate (17). The first support plate (17) and the second support plate (18) are welded with guide sleeves (19). The locking pin (32) is slidably inserted into the guide sleeve (19). When locking the docking post (21), one side of the locking pin (32) is located in the guide sleeve (19), and the other side is inserted into the locking slot.

5. The height-adjustable desk according to claim 4, characterized in that: The elastic locking pin assembly (3) further includes a drive spring (33), which is inserted into the guide sleeve (19). One end of the drive spring (33) abuts against the side of the locking pin (32) near the first support plate (17), and the other end abuts against the first support plate (17) to drive the locking pin (32) to tend to insert into the locking slot.

6. The height-adjustable desk according to claim 1, characterized in that: The elastic locking pin assembly (3) also includes a steel wire rope (34). A synchronously rotating rope winding post (35) is connected to the knob (31). One side of the rope winding post (35) is inserted into the lifting frame (1) and is rotatably connected to the lifting frame (1). The outer wall of the rope winding post (35) is provided with a rope hole (351). The steel wire rope (34) passes through the rope hole (351). Both ends of the rope winding post (35) are respectively connected to two locking pins (32) to drive the locking pins (32) to move.

7. The height-adjustable desk according to claim 6, characterized in that: The knob (31) is sleeved on the rope winding post (35), and the knob (31) is adapted to slide and connect with the rope winding post (35); the lifting frame (1) has a plurality of rotation limiting grooves (151) on the outer wall near the knob (31), and the knob (31) is fixedly provided with a rotation limiting post (312) on the side near the lifting frame (1). The rotation limiting post (312) is adapted to be inserted into any of the rotation limiting grooves (151) so that the rotation of the knob (31) is limited; when it is necessary to rotate the knob (31), a pulling force is applied to the knob (31) to drive the knob (31) to move relative to the rope winding post (35) so that the rotation limiting post (312) is pulled out from the limiting groove.

8. The height-adjustable desk according to claim 7, characterized in that: One side of the rope-winding post (35) is exposed to the air and connected to the knob (31). The top of the knob (31) is provided with a spline groove (311). The outer wall of the rope-winding post (35) is fixed with a spline. The spline is inserted into the spline groove (311) so that the knob (31) and the rope-winding post (35) rotate synchronously. One end of the rope-winding post (35) inserted into the spline groove (311) is provided with a mounting groove (352). A tension spring (38) is installed in the mounting groove (352). The other end of the tension spring (38) is connected to the knob (31). When no tension is applied to the knob (31), the tension spring (38) drives the rotation limiting post (312) to be inserted into the limiting groove.

Images