Connecting structure of stand column and table leg of lifting table
By employing a single-sided locking device between the uprights and legs of the height-adjustable table, and utilizing horizontal locking and vertical clamping, the problems of slow installation and unstable connection in existing technologies are solved, achieving a fast and stable connection effect and improving the user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2026-03-10
AI Technical Summary
The existing uprights and legs of height-adjustable desks require tools for slow installation, and the connection is not firm or stable. Especially after long-term use, they may loosen and wobble, affecting the user experience.
A single-sided locking device is adopted, including a locking column at the bottom of the column and a locking device inside the table leg. The column and table leg are fixed by horizontal locking and vertical squeezing. The locking device is pre-fixed in the factory, and the connection can be completed on site by only one-sided operation. The locking plate is equipped with a horizontal spring and a bevel to provide squeezing force.
It achieves a fast and stable connection without the need for tools, has a simple structure, is easy to operate on one side, and does not loosen even after long-term use, thus improving the user experience.
Smart Images
Figure CN121621674A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of lifting table, in particular to a connecting structure of a lifting table's stand column and table leg. BACKGROUND
[0002] The connecting structure of the stand column and the table leg of the prior art lifting table basically adopts a structure locked by screws or threaded fasteners, which needs tools and multiple screws to be screwed, thus the installation speed is slow.
[0003] The prior art personnel uses a single screw such as a knob screw, which does not need tools, but the installation speed is still slow, and the single screw has a relatively small stress surface, and the stability and reliability of the connection are not strong.
[0004] The prior art personnel uses a transverse extrusion structure to extrude the bottom end of the table leg and the table leg transversely, which does not need tools, and the installation speed is relatively fast, but still has the following deficiencies: only transverse extrusion force and no vertical extrusion force, which makes the connection of the table leg and the table leg not firm, unstable and unreliable, especially the deformation of the parts may occur during use, which makes the connection loose, thus the lifting table shakes more and affects the user's experience.
[0005] The connecting structure of the prior art fastening type table leg and the table leg without tools also has a common deficiency: the structure is relatively complex due to the extrusion from both sides to the middle, and the convenience of installation and operation is slightly insufficient. SUMMARY
[0006] The technical problem to be solved by the present application is to provide a connecting structure of a lifting table's stand column and table leg without tools, which has transverse extrusion force and vertical extrusion force to make the connection firm and stable, and only single-sided locking to make the structure relatively simple and the clamping convenient.
[0007] The technical solution of the present application is to provide a connecting structure of a lifting table's stand column and table leg, which includes at least one locking column arranged at the bottom end of the stand column and a single-sided locking device arranged in the table leg and used for transversely clamping and vertically extruding the locking column to fix the stand column and the table leg, and the top plate of the table leg has at least one locking column through hole.
[0008] After the above structure is adopted, the connecting structure of the column and the leg of the lifting table has the following advantages: the locking device can be fixed in the leg in the factory, when the column and the leg are connected on site, the bottom end of the column is upward, without the aid of tools, only the locking post hole of the leg with the fixed locking device is pressed to the position of the respective locking post, the locking device is locked to the locking post, the connection is fast, the locking device has horizontal extrusion force and vertical extrusion force on the locking post, so that the connection of the column and the leg is firm, stable and reliable, and only one side locking is needed, such as moving the locking plate in one direction, so as to horizontally clasp and vertically extrude the locking post, and compared with the prior art, the structure is simple and the clasp or unlocking is convenient.
[0009] Further, the one-side locking device comprises a locking plate sliding along the length direction of the leg, the locking plate has at least one long hole, each long hole comprises a large hole for the locking post to pass through or a gap for the clamping post in the annular groove of the locking post to pass in and out, and each long hole further comprises a small hole in communication with the large hole or the gap and for the clamping post in the annular groove of the locking post to clasp, so as to fix the column and the leg; the one-side locking device further comprises a horizontal spring clamping the small hole of the locking plate on the clamping post in the natural release state; the one-side locking device further comprises an inclined surface arranged on the bottom surface of the locking plate and used for vertically extruding the locking post, the horizontal position of the inclined surface at the end of the small hole is low, and the horizontal position of the inclined surface away from the end of the small hole is high; and the one-side locking device further comprises a vertical elastic pressing assembly for locking the locking plate in the locking state or for driving to the unlocking state and positioning. After the above specific structure of the one-side locking device is adopted, after the locking post is inserted into the large hole of the first long hole or enters from the gap, only the vertical elastic pressing assembly is pressed, the elastic force of the horizontal spring makes the first small hole of the locking plate clasp the clamping post and be always vertically extruded by the first inclined surface, that is, the clasp is automatically locked. If the leg needs to be disassembled, only the vertical elastic pressing assembly is pressed and horizontally driven, so that the small hole of the locking plate is separated from the clamping post and the vertical extrusion of the upper and lower annular surfaces of the annular groove on the first inclined surface is separated, and the leg is taken away, the locking or separation operation is convenient and fast. Even if the parts are deformed after long time use, the connection will not become loose, and the lifting table will not shake to affect the good experience of the user. Further, the connection is fast, the locking device has horizontal extrusion force and vertical extrusion force on the locking post, so that the connection of the column and the leg is firm, stable and reliable, and only one side locking is needed, so that the structure is relatively simple and the clasp is relatively convenient compared with the prior art of two-side locking to the middle.
[0010] Further, the long hole is a first long hole, the space for the big head of the lock post to pass through is a big hole, the first long hole and the matched lock post are both two and are arranged in parallel along the width direction of the table leg, and the two first long holes are arranged at one end of the locking plate close to the vertical elastic pressing assembly; the slope for vertically pressing the lock post is a first slope, the horizontal position of the first slope at the big hole is high, the horizontal position of the first slope at the small hole end is low, and the annular grooves of the two lock posts are clamped to the top plate of the table leg through the respective first slopes. After the above specific structure is adopted for the one-side locking device and the lock post, the locking device can also lock the lock post well as long as the two lock posts and the two matched first long holes, and the locking device has the horizontal extrusion force and the vertical extrusion force on the lock post, so that the connection between the stand column and the table leg is firm, stable and reliable. Compared with the four lock posts, the connection speed is relatively fast without the aid of tools, the one-end or one-side locking structure is relatively simple and convenient to clamp.
[0011] Further, the top end of the cylindrical shell of the vertical elastic pressing assembly is fixed on the locking plate, the large-diameter column of the stepped column of the button is slidably matched in the lower end circular hole of the cylindrical shell, there is a vertical compression spring between the top end of the stepped column and the locking plate, the bottom plate of the table leg is provided with a second long hole, each second long hole comprises a first large-diameter hole for clamping the large-diameter column to limit the locking plate in the locked state, a transition small hole for the small-diameter column to pass through after being pressed, and a second large-diameter hole for the large-diameter column to clamp to limit the locking plate in the unlocked state. After the above specific structure is adopted for the vertical elastic pressing assembly, the operation of locking to the locked state, moving horizontally or limiting to the unlocked state is convenient and fast, and the stability and reliability of the work are good.
[0012] Further, the connection structure of the stand column and the table leg of the lifting table further comprises two third long holes; the bottom end of the stand column is further provided with another two lock posts, the two third long holes are arranged at one end of the locking plate away from the vertical elastic pressing assembly, the third long hole comprises a gap for the clamping column in the annular groove of the lock post to enter and exit the third long hole, and a small hole for the clamping column in the annular groove of the lock post to clamp, and the gap away from the vertical elastic pressing assembly has a big head accommodating cavity for the big head of the lock post to insert and accommodate; the slope for vertically pressing the lock post is a second slope, the horizontal position of the second slope at the opening is high, the horizontal position of the second slope at the small hole end is low, and the annular grooves of the two lock posts are clamped to the top plate of the table leg through the respective second slopes. After the above specific structure is adopted for the one-side locking device and the lock post, compared with the above specific structure of adopting two lock posts, four lock posts are adopted, the technical effects of preventing the connection structure from being loose and preventing the lifting table from shaking are better, and the locking device has the horizontal extrusion force and the vertical extrusion force on the lock post, so that the connection between the stand column and the table leg is firmer, more stable and more reliable.
[0013] Further, the housing of the unilateral locking device is an open upward box, the locking plate is an open downward H-shaped plate, the two vertical plates of the H-shaped plate are slidingly fitted in the box along the length direction of the box, the H-shaped plate has two horizontal compression springs fixed vertical plates at one end close to the two first small holes, the box has horizontal compression spring accommodating cavities at one end close to the two first small holes, one end of the two horizontal compression springs abuts against and is fixed on the one end plate of the box, the other end of the two horizontal compression springs abuts against and is fixed on the respective horizontal compression spring fixed vertical plate, and the bottom box plate has a fourth long-shaped through hole for the vertical elastic pressing assembly to slide along the length direction. After the above structure is adopted, the unilateral locking device has a compact structure, the sliding and guiding of the locking plate are better, the flexibility and reliability of the compression spring to the locking plate are stronger, and the technical effects that the locking device has horizontal extrusion force and vertical extrusion force on the locking post at the same time to make the connection of the post and the leg firm, stable and reliable are further ensured.
[0014] Further, the height dimension of the box is equal to the height dimension of the bottom plate to the top plate of the leg, the bottom plate of the leg has two positioning through holes, and the outer bottom surface of the box has a plurality of positioning convex columns accommodated in the respective positioning through holes. After the above structure is adopted, when the box of the unilateral locking device is installed in the leg, the top plate and the box type leg body are only needed to be separated, for example, the top plate is taken away by unscrewing the screwed screws, the box of the locking device is put into the leg body, the plurality of positioning convex columns are embedded in the respective positioning through holes, and the screws are tightened, at this time, the locking post through hole is aligned with the large hole of the respective long-shaped through hole, so that the installation of the box of the locking device is convenient and fast, and the fixation of the leg is firm and reliable. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 is a structural schematic view of one embodiment of the lifting table installed with the post and leg connecting structure of the application.
[0016] Figure 2 is Figure 1 is an enlarged structural schematic view of A in
[0017] Figure 3 is Figure 1 is a vertical sectional structural schematic view of the table plate and the leg along one post in Figure 3 、 Figure 4 and Figure 5 the horizontal compression springs in
[0018] Figure 4 is Figure 3 is an enlarged structural schematic view of B in
[0019] Figure 5 is Figure 4 is a structural schematic view of the unlocking state of the same part of the connecting structure in
[0020] Figure 6 is Figure 1 enlarged schematic view of the explosion structure of site A in Figure 1 (both the stand and the table leg are drawn with the length omitted in the figure).
[0021] Figure 7 is Figure 1 enlarged schematic view of the explosion structure of site A in Figure 2 (both the stand and the table leg are drawn with the length omitted in the figure).
[0022] Figure 8 is Figure 1 enlarged schematic view of the explosion structure of site A in
[0023] Figure 9 is a schematic view of the structure of the locking plate in the present application.
[0024] Figure 10 is a schematic view of another embodiment of the lifting table with the connecting structure of the stand and the table leg of the present application.
[0025] shown in the figure:
[0026] 1. a lifting table, 11. a stand, 111. an inner tube of a rectangular sleeve, 112. an outer tube of a rectangular sleeve, 113. a rectangular bottom end plate, 12. a table leg, 121. a top plate, 1211. a locking post via hole, 122. a bottom plate, 1221. a second long-shaped via hole, 12211. a first large-diameter hole, 12212. a transition small hole, 12213. a second large-diameter hole, 1222. a positioning via hole, 123. a bottom disc, 124. a rectangular limiting frame, 13. a table plate;
[0027] 2. a locking post, 21. an annular groove, 22. a clamping post;
[0028] 3. a unilateral locking device, 31. a locking plate, 311. a first long-shaped via hole, 3111. a large hole, 3112. a first small hole, 312. a first inclined surface, 313. a third long-shaped via hole, 3131. a notch, 3132. a second small hole, 314. a second inclined surface, 315. a horizontal compression spring fixing vertical plate, 32. a horizontal compression spring, 33. a vertical compression spring assembly, 331. a cylindrical shell, 3311. a circular hole, 332. a button, 3321. a large-diameter post, 3322. a small-diameter post, 333. a vertical compression spring, 34. a box body, 341. a large-head accommodating cavity, 342. a horizontal compression spring accommodating cavity, 343. an end plate, 344. a positioning protruding post, 345. a sliding groove, 346. a bottom box plate, 3461. a fourth long-shaped via hole. DETAILED DESCRIPTION
[0029] The specific embodiments of the present application will be further described below with reference to the drawings. It should be noted that the description of these specific embodiments is intended to help understand the present application, but does not constitute a limitation of the present application. In addition, the technical features involved in the various specific embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0030] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 .
[0031] The prior art lifting table 1 comprises a table plate 13, a stand column 11 and a table leg 12 connected with the stand column 11 at 90 degrees, the table leg 12 can be a long strip box body comprising a top plate 121 and a bottom plate 122, and each end of the bottom of the table leg 12 can have a supporting bottom disc 123 or bottom column. The stand column 11 is generally connected with the middle of the length of the table leg 12, and the stand column 11 is generally a rectangular sleeve, the inner tube 111 of the rectangular sleeve is generally a fixed tube and is connected with the table leg 12, and the outer tube 112 of the rectangular sleeve is generally a lifting movable tube. Of course, it can also be reversed, that is, the outer tube is fixed and the inner tube is lifted, that is, the inner tube is a lifting movable tube.
[0032] The connecting structure of the stand column and the table leg of the lifting table of the present application comprises at least one lock column 2 arranged at the bottom end of the stand column 11 and a single-sided locking device 3 arranged in the table leg 12 and used for transversely clamping and vertically extruding the lock column 2 to fix the stand column 11 with the table leg 12. Referring to Figure 6 , the lock column 2 can be four, symmetrically distributed on the rectangular bottom end plate 113 of the stand column 11, that is, two pairs along the length direction, two in each pair; or it can be considered as two pairs along the width direction, two in each pair, and the four lock columns 2 form a rectangle. Referring to Figure 7 , the top plate 121 of the table leg 12 has at least one lock column through hole 1211, such as four lock column through holes 1211. It is not difficult to understand that the four lock column through holes 1211 correspond one-to-one with the four lock columns 2 and are coaxial with each other. The four lock columns 22 can also be called four lock columns 2.
[0033] The single-side locking device 3 comprises a locking plate 31 sliding along the length direction of the table leg 12, the locking plate 31 has a plurality of, for example four, elongated holes, each of which comprises a large hole 3111 for the big head of the locking post 2 to pass through or a gap 3131 for the clamping post 22 in the annular groove 21 of the locking post 2 to pass in and out, and each of which further comprises a small hole in communication with the large hole 3111 or the gap 3131 and for the clamping post 22 in the annular groove 21 of the locking post 2 to be clamped so as to fix the upright post 11 and the table leg 12. The single-side locking device 3 further comprises a transverse spring, for example a transverse compression spring 32, clamping the small hole of the locking plate 31 on the clamping post 22 in the annular groove 21 of the locking post 2 in a natural release state. The single-side locking device 3 further comprises an inclined surface arranged on the bottom surface of the locking plate 31 and used for vertically pressing the locking post 2, the horizontal position of the inclined surface at the end of the small hole is low, and the horizontal position of the inclined surface away from the end of the small hole is high. The single-side locking device 3 further comprises a vertical spring pressing assembly 33 locking the locking plate 31 in a locking state or being actuated to an unlocking state and being positioned.
[0034] Referring to Figure 6 , the elongated hole can be a first elongated hole 311, and the space for the big head of the locking post 2 to pass through can be a large hole 3111. The first elongated hole 311 and the matching locking post 2 are both two and arranged in parallel along the width direction of the table leg 12, and the two first elongated holes 311 are both arranged at one end of the locking plate 31 close to the vertical spring pressing assembly 33. The inclined surface used for vertically pressing the locking post 2 is a first inclined surface 312, and the horizontal position of the inclined surface away from the end of the small hole is high, for example, the horizontal position of the first inclined surface 312 at the large hole 3111 is high, and the horizontal position of the first inclined surface 312 at the end of the small hole, for example, the first small hole 3112, is low. The annular grooves 21 of the two locking posts 2 clamp the top plate 121 of the table leg 12 and the locking plate 31 through the respective first inclined surfaces 312.
[0035] Referring to Figure 6The connection structure between the upright and the legs of the height-adjustable table of the present invention also includes two third elongated through holes 313. Two additional locking pins 2 are also provided at the bottom of the upright 11, for a total of four locking pins 2. The two third elongated through holes 313 are located at the end of the locking plate 31 away from the vertical spring-loaded component 33. The space through which the large end of the locking pin 2 passes is the large end receiving cavity 341 within the box 34 described below. Each third elongated through hole 313 includes a notch 3131 for the locking pin 22 in the annular groove 21 of the locking pin 2 to enter and exit the third elongated through hole 313 from the large end receiving cavity 341, and a small hole, such as a second small hole 3132, for the locking pin 22 in the annular groove 21 of the locking pin 2 to engage. At the outer end of the notch 3131 away from the vertical spring-loaded component 33, there is a large end receiving cavity 341 for the large end of the locking pin 2 to be inserted and accommodated. The inclined surface used for vertically pressing the locking pin 2 is the second inclined surface 314. The horizontal position of the inclined surface away from the end of the small hole is higher, such as the second inclined surface 314 at the notch 3131, which is higher. The horizontal position of the second inclined surface 314 at the end of the small hole, such as the second small hole 3132, is lower. The annular grooves 21 of the two locking pins 2 clamp the locking plate 31 and the top plate 121 of the table leg 12 through their respective second inclined surfaces 314. It is easy to understand that the third elongated through hole 313 has no large hole. After the large end of the locking pin 2 is inserted, it falls directly into the large end receiving cavity 341 on one side of the notch 3131 without interference.
[0036] The housing of the single-sided locking device 3 is a box 34 with its opening facing upwards. The locking plate 31 is a U-shaped plate with its opening facing downwards. The two vertical plates of the U-shaped plate slide and engage within the box 34 along the length of the box. If they slide and engage within the grooves 345 on both sides of the box 34, the guiding, flexibility, and reliability of the sliding of the locking plate 31 will be improved. There are two horizontal compression springs fixing the vertical plates 315 at one end of the U-shaped plate near the two first small holes 3112. There is a horizontal compression spring receiving cavity 342 at one end of the box 34 near the two first small holes 3112. One end of the two horizontal compression springs 32 abuts against and is fixed to one end plate 343 of the box 34, and the other end of the two horizontal compression springs 32 abuts against and is fixed to their respective horizontal compression spring fixing vertical plates 315.
[0037] The height of the box body 34 is equal to the height from the base plate 122 to the top plate 121 of the table leg 12. The base plate 122 of the table leg 12 has two positioning through holes 1222, and the outer bottom surface of the box body 34 has two positioning protrusions 344 that are accommodated in their respective positioning through holes 1222. The bottom plate 346, or box bottom plate, has a fourth elongated through hole 3461 for the vertical spring-loaded component to slide along its length.
[0038] The top end of the cylindrical outer shell 331 of the vertical spring-loaded assembly 33 is fixed to the locking plate 31. The large-diameter column 3321 of the step column of the button 332 is slidably fitted in the lower end round hole 3311 of the cylindrical outer shell 331. There is a vertical compression spring 333 between the top end of the step column and the locking plate 31. There is a second elongated through hole 1221 on the bottom plate 122 of the table leg 12. Each second elongated through hole 1221 includes a first large-diameter hole 12211 that engages the large-diameter column 3321 to limit the locking plate 31 to the locked state, a transition small hole 12212 for the small-diameter column 3322 to pass through after being pressed, and a second large-diameter hole 12213 for the large-diameter column 3321 to engage to limit the locking plate 31 to the unlocked state.
[0039] The upright 11 can be called a table leg, and the table foot 12 can be called a base, footboard, or foot base, etc. The fixing methods, in addition to those already specified, can include welding, screw threading, or bolt and nut threading, etc. Horizontal is also called horizontal direction, and vertical is also called vertical or vertical direction. The top view of the first elongated through hole 311 resembles a gourd shape and can be called a gourd-shaped through hole. The terms "opening" and "notch" are interchangeable. Vertical clamping is also called top-and-bottom clamping or top-and-bottom pressing. The single-sided locking device 3 can also be called a one-sided locking device or a one-end locking device, meaning that simply moving the locking plate 31 to one side, i.e., moving the locking plate 31 in one direction, is sufficient to horizontally engage and vertically clamp the locking post 2. The unlocked state is also called the open state.
[0040] The above specific structure allows for the following variations.
[0041] like Figure 10 As shown, there can be one locking pin 2 at the bottom of the column 11, and one locking pin through hole 1211 on the top plate 121 of the table leg 12, which is matched with the locking pin 2. To prevent the inner tube 111 of the rectangular sleeve at the bottom of the column 11 from rotating relative to the table leg 12, a convex rectangular limiting frame 124 can be provided on the top plate 121 of the table leg 12, and the inner tube 111 of the rectangular sleeve is circumferentially limited within the convex rectangular limiting frame 124. Of course, a rectangular groove can also be used instead of the convex rectangular limiting frame.
[0042] The third elongated through-hole can be omitted, and the four elongated through-holes that mate with the four locking pins can all adopt the structure of the first elongated through-hole. The first inclined surface and the mating relationship with the locking pins are also the same, achieving the same technical effect as the above structure. However, compared to the previous structure, the housing and locking plate of the single-sided locking device need to be relatively longer, occupying more space and consuming more material. Therefore, the structure of two first elongated through-holes and two third elongated through-holes is preferred.
[0043] The lateral compression spring can be a single spring, with one end abutting and fixed to one end plate of the housing of the single-sided locking device, and the other end abutting and fixed to the cylindrical outer shell of the vertical spring assembly.
[0044] The lateral compression spring can also be replaced by two tension springs. The tension springs are set in a cavity of the box body of the single-sided locking device at the end away from the vertical spring compression component. One end of each tension spring is fixed or welded to the other end plate of the box body, and the other end of each tension spring is fixed or welded to the end of the locking plate away from the vertical spring compression component.
[0045] The height of the box can also be slightly greater than the height from the top plate to the bottom plate of the table leg, so that after the top plate and bottom plate of the table leg are fixed with screws, the box of the single-sided locking device is also firmly and reliably fixed to the table leg.
[0046] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not labeled. The drawings are for illustrative purposes only; in case of any discrepancies between the drawings and the text description, or between the drawings themselves, the text description shall prevail.
[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A connection structure between the upright and the legs of a height-adjustable table, characterized in that: The single-sided locking device comprises at least one locking pin arranged at the bottom end of the stand and at least one locking hole arranged in the top plate of the leg for transversely clamping and vertically extruding the locking pin to fix the stand and the leg.
2. The connection structure of the leg and the foot of the sit-stand desk according to claim 1, characterized in that: The single-sided locking device comprises a locking plate sliding along the length direction of the leg, the locking plate having at least one long hole, each long hole comprising a large hole for the locking pin to pass through or a gap for the locking pin in the annular groove to pass in and out, and each long hole further comprising a small hole in communication with the large hole or the gap and for the locking pin in the annular groove to clasp to fix the stand and the leg; the single-sided locking device further comprises a transverse spring clamping the small hole of the locking plate to the locking pin in the annular groove in a natural release state; the single-sided locking device further comprises an inclined surface arranged at the bottom of the locking plate and for vertically extruding the locking pin, the horizontal position of the inclined surface at the end of the small hole being low, and the horizontal position of the inclined surface away from the end of the small hole being high; the single-sided locking device further comprises a vertical spring assembly for locking the locking plate in a locking state or for unlocking and positioning.
3. The connection structure of the leg and the foot of the sit-stand desk according to claim 2, characterized in that: The long hole is a first long hole, and the first long hole and the matching locking pin are both two and arranged in parallel along the width direction of the leg, the two first long holes being arranged at one end of the locking plate close to the vertical spring assembly; the inclined surface for vertically extruding the locking pin is a first inclined surface, the horizontal position of the first inclined surface at the large hole being high, and the horizontal position of the first inclined surface at the end of the small hole being low, the annular grooves of the two locking pins clamping the locking plate and the top plate of the leg through the respective first inclined surfaces.
4. The connection structure of the leg and the foot of the sit-stand desk according to claim 2, characterized in that: The top end of the cylindrical shell of the vertical spring assembly is fixed on the locking plate, the large-diameter column of the stepped column of the button is slidingly fitted in the lower end hole of the cylindrical shell, there is a vertical compression spring between the top end of the stepped column and the locking plate, and the bottom plate of the leg has a second long hole, each second long hole comprising a first large-diameter hole for clamping the large-diameter column to limit the locking plate in a locking state, a transition small hole for the small-diameter column to pass through after being pressed, and a second large-diameter hole for the large-diameter column to clasp to limit the locking plate in an unlocking state.
5. The connection structure of the leg and the foot of the height adjustable table according to claim 3, wherein: The single-sided locking device further comprises two third long holes, and the bottom end of the stand further comprises another two locking pins, the two third long holes being arranged at one end of the locking plate away from the vertical spring assembly, the third long hole comprising a gap for the locking pin in the annular groove to pass in and out of the third long hole and a small hole for the locking pin in the annular groove to clasp, and the outer end of the gap away from the vertical spring assembly having a large-head accommodating cavity for the large head of the locking pin to insert and accommodate; the inclined surface for vertically extruding the locking pin is a second inclined surface, the horizontal position of the second inclined surface at the opening being high, and the horizontal position of the second inclined surface at the end of the small hole being low, the annular grooves of the two locking pins clamping the locking plate and the top plate of the leg through the respective second inclined surfaces.
6. The connection structure of the leg and the foot of the sit-stand desk according to claim 2, characterized in that: The shell of the unilateral locking device is an open upward box, the locking plate is a open downward H-shaped plate, the two vertical plates of the H-shaped plate are slidingly fitted in the box along the length direction of the box, the H-shaped plate has two spring fixed vertical plates at the end close to the two first small holes, the box has spring containing cavities at the end close to the two first small holes, the two ends of the two transverse compression springs are abutted on and fixed on the end plate of the box, the other ends of the two transverse compression springs are abutted on and fixed on the respective spring fixed vertical plates, and the bottom box plate has a fourth long-shaped through hole for the vertical spring compression assembly to slide along the length direction.
7. The connection structure of the leg and the foot of the sit-stand desk according to claim 6, characterized in that: The height dimension of the box is equal to the height dimension of the bottom plate to the top plate of the table leg, the bottom plate of the table leg has two positioning through holes, and the outer bottom surface of the box has two positioning convex columns contained in the respective positioning through holes.