Connecting structure of a column and a leg of a height-adjustable table

Abstract

The application discloses a connecting structure of a stand column and a table leg of a lifting table, which comprises a protrusion fixed on the bottom end of the stand column or the table leg, and a cam pressing assembly fixed on the table leg or the bottom end of the stand column and transversely and vertically extruding the protrusion; the two connecting surfaces of the end and the middle of the protrusion are both inclined surfaces with thick inside and thin outside; the mounting base of the cam pressing assembly is provided with a sliding rod, two pressing strips are slidingly matched on the sliding rod, the mounting base is provided with cavities for the sliding of the respective pressing strips, one side of the mounting base is hingedly provided with a cam for pressing the pressing strips to transversely and vertically extrude the protrusion inserted between the two pressing strips and fix the stand column and the table leg, the matching surfaces of the respective pressing strips and the inclined surfaces of the protrusion are all inclined surfaces with thin inside and thick outside, and a lever type handle is connected to the cam for extruding the pressing strips or releasing the extrusion of the pressing strips.

Description

Technical Field

[0001] This invention relates to the field of height-adjustable desk technology, specifically to a connection structure between the uprights and legs of a height-adjustable desk. Background Technology

[0002] The existing technology for height-adjustable desks uses screws or threaded fasteners to lock the uprights and legs, which requires tools and tightens multiple screws, making the installation process slow.

[0003] Later, technicians used single screws, such as knob screws, which do not require tools, but the installation speed is still relatively slow, and the force-bearing surface of a single screw is relatively small, resulting in weak stability and reliability of the connection.

[0004] Some technicians use a horizontal clamping structure to clamp the bottom of the table legs to the table feet horizontally. This does not require tools and the installation speed is relatively fast, but it still has the following shortcomings: there is only horizontal clamping force and no vertical clamping force, which makes the connection between the table legs and the table feet not firm, unstable and unreliable. In addition, it uses more components such as guide rails and springs, making the structure relatively complex. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a connection structure between the uprights and legs of a height-adjustable table that does not require tools, has a fast installation speed, and simultaneously has lateral and vertical compressive forces to ensure a firm and stable connection.

[0006] The technical solution of the present invention is to provide a connection structure between the upright and the legs of a height-adjustable table, including a protrusion at the bottom of the upright and a cam clamping assembly on the legs, or including a protrusion on the legs and a cam clamping assembly at the bottom of the upright. When the upright is inserted into the legs for installation, the cam clamping assembly is used to simultaneously squeeze the protrusion in both the horizontal and vertical directions to lock the upright and the legs.

[0007] With the above structure, the connection structure between the column and the legs of the lifting table of the present invention has the following advantages: When installing the column and the legs on site, no tools are needed. Simply insert the mating protrusions on the bottom of the column and the legs into the cam clamping assembly and clamp them horizontally and vertically at the same time. The clamping force of the cam clamping assembly replaces the clamping force provided by screws or threaded fasteners, which makes the installation fast. At the same time, it has both horizontal and vertical clamping forces, which makes the connection between the column and the legs firm, stable and reliable.

[0008] Furthermore, the width of the end of the protrusion is greater than the width of the middle part, and the two connecting surfaces of the end and the middle part are both inclined surfaces formed by being thicker on the inside and thinner on the outside; the cam clamping assembly includes a mounting base with at least one slide rod on the mounting base, two pressure strips mounted on the slide rod, wherein at least one pressure strip slides in cooperation with the slide rod, the mounting base has a cavity for sliding each pressure strip, and at least one cam is hinged to one side of the mounting base for pressing one of the pressure strips and for pressing the two pressure strips laterally and vertically to press the protrusion inserted between the two pressure strips, thereby fixing the column and the table leg to each other, the mating surfaces of each pressure strip and the inclined surface of the protrusion are both inclined surfaces formed by being thinner on the inside and thicker on the outside, and a lever-type lever for pressing or releasing the pressing of the pressure strip is connected to the cam. With the above structure, the connection structure is simple. By using the two symmetrical inclined surfaces on the protrusion and the two matching inclined surfaces on the two pressure strips, a horizontal clamping force and a vertical clamping force are generated simultaneously during the clamping process. This further ensures fast installation and makes the connection between the column and the table leg more firm, stable and reliable.

[0009] Furthermore, the center of the protrusion has two symmetrical grooves; the mounting base is rectangular with a rectangular through hole in the middle for inserting the protrusion; there are two sliding rods, fixed on the mounting bases at both ends of the rectangular through hole, and the outer ends of the two sliding rods are fixed to one end of a cam hinge shaft; there are two cams, and the eccentric holes of the two cams are movably fitted onto the cam hinge shaft; the lever is a rectangular plate, one side of which is fixed to the two cams. With the above structure, during installation, the protrusion is inserted into the rectangular through hole of the mounting base and between the two pressure strips. Moving the rectangular plate causes the two cams to press one pressure strip and drive the other pressure strip to press laterally against the walls of the two grooves, and then vertically presses the two inclined surfaces of the two protrusions through the two inclined surfaces of the two pressure strips. This further ensures a fast installation speed and a more secure, stable, and reliable connection between the column and the table leg. Moreover, with the lever using a rectangular plate, the force application surface is wider and the contact area with the mounting base is larger, resulting in better stability and reliability.

[0010] Furthermore, the cam hinge shaft has axial limiting structures at both ends. With the above structure, both ends of the hinge shaft and one end of each of the two slide rods can be detached, making the installation of the cam clamping assembly more convenient.

[0011] Furthermore, the two slide rods at the end furthest from the cam hinge shaft have shoulders to prevent one of the pressure bars from detaching from the slide rod. The mounting base has two longitudinally penetrating circular through holes at both ends to accommodate the slide rods and shoulders. With this structure, the installation of the slide rods and shoulders is more convenient and faster, making the cam clamping assembly more reliable, improving the stability and reliability of the lateral and vertical compression of the protrusions, and making the connection between the column and the table leg more secure, stable, and reliable.

[0012] Furthermore, between the two cams is a U-shaped block fixed on the mounting base, and the inner groove of the U-shaped block is a chamber for a pressure strip to slide laterally. With the above structure, the normal sliding of the pressure strip is not hindered, and the cam clamping assembly is more robust and has better mechanical properties, further ensuring a more robust, stable, and reliable connection between the column and the table leg.

[0013] Furthermore, the protrusion is fixed to the bottom end of the column, and the cam clamping assembly is fixed to the table leg. The top plate of the table leg has a rectangular through hole for the protrusion to be inserted, and the bottom box of the table leg has a notch for accommodating the mounting seat of the cam clamping assembly. When the lever of the cam clamping assembly is pressed, it is pressed tightly against the mounting seat, away from the bottom surface of the table leg's top plate. With the above structure, a first specific embodiment is provided where the protrusion is fixed to the bottom end of the column and the cam clamping assembly is fixed to the table leg. When connecting the table leg to the table frame, the tabletop of the height-adjustable table can be placed on the ground so that the bottom ends of the two columns and the protrusions fixed thereon face upwards. Then, the table leg with the cam clamping assembly fixed thereon is rotated 180 degrees, and the rectangular through hole of the mounting seat is inserted into the protrusion and positioned between the two pressure strips. Finally, the vertical rectangular plate is rotated downwards and made parallel to the top plate of the table leg, thus completing the connection and installation of the column and the table leg. This further ensures fast installation speed and provides a strong, stable, and reliable connection between the column and the table leg, thanks to both lateral and vertical compressive forces.

[0014] Furthermore, the cam clamping assembly is fixed to the bottom end of the column, and the protrusion is fixed to the table leg. The bottom box of the table leg has a notch for accommodating the protrusion connecting plate, and the top plate of the table leg has a rectangular through hole for the protrusion to extend out. The lever-type lever of the cam clamping assembly is pressed tightly against an outer side wall of the column. With the above structure, a second specific embodiment is provided where the protrusion is fixed to the table leg and the cam clamping assembly is fixed to the bottom end of the column. When connecting the table leg to the table frame, the tabletop of the height-adjustable table can be placed on the ground so that the bottom ends of the two columns and the cam clamping assembly fixed thereon face upwards. Then, the table leg with the protrusion fixed thereon is rotated 180 degrees, and the protrusion is inserted into the rectangular through hole of the mounting base and positioned between the two pressure strips. Then, the horizontal rectangular plate is rotated downwards and made parallel to an outer vertical plate of the column, thus completing the connection and installation between the column and the table leg. This further ensures the technical effect of fast installation speed and the strong, stable, and reliable connection between the column and the table leg due to both lateral and vertical clamping forces.

[0015] Furthermore, the width of the end of the protrusion near the cam clamping assembly is greater than the width of the middle part of the protrusion, and the width of the end plate of the protrusion away from the clamping assembly is greater than the width of the middle part of the protrusion and also greater than the width of the end of the protrusion near the cam clamping assembly. The end plate of the protrusion away from the clamping assembly is fixed to a protrusion connecting plate, and the protrusion connecting plate is fixed to the bottom plate of the column or the top plate of the table leg by multiple screws. With the above structure, the lateral and vertical compression of the protrusion by the cam clamping assembly makes the connection between the column and the table leg stronger, more stable, and more reliable, and the connection between the protrusion and the bottom of the column or the table leg is quicker, stronger, and more reliable.

[0016] Furthermore, the end face of the protrusion furthest from the cam clamping assembly is a symmetrical inclined plane with a convex center and concave sides. With the above structure, the insertion of the protrusion into the cam clamping assembly is more convenient, faster, and more accurate, and the lateral and vertical clamping of the protrusion into the cam clamping assembly has better firmness, stability, and reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a height-adjustable table according to an embodiment of the connection structure between the column and the table legs of the present invention. Figure 1 ( Figures 1-9 These are all embodiments where the protrusions are located at the bottom of the column; the tabletop is omitted. Figure 2 (Same as above).

[0018] Figure 2 This is a schematic diagram of the structure of a height-adjustable table according to an embodiment of the connection structure between the column and the table legs of the present invention. Figure 2 (The cam clamping assembly is clamped both horizontally and vertically).

[0019] Figure 3 yes Figure 2 A magnified structural diagram of A in the diagram.

[0020] Figure 4 yes Figure 3 The exploded structural diagram of this connection structure is shown in the figure.

[0021] Figure 5 yes Figure 4 The diagram shows the mounting bracket from a different angle and enlarged.

[0022] Figure 6 This is a schematic diagram of the connection structure between the column and the table leg of the present invention, showing that the cam clamping assembly is not clamped and some parts are exposed. Figure 1 .

[0023] Figure 7 yes Figure 6 A magnified structural diagram of B in the diagram.

[0024] Figure 8This is a schematic diagram of the connection structure between the column and the table leg of the present invention, showing that the cam clamping assembly is not clamped and some parts are exposed. Figure 2 .

[0025] Figure 9 yes Figure 8 A magnified structural diagram of C.

[0026] Figure 10 This is a schematic diagram of a height-adjustable table with another embodiment of the connection structure between the column and the table legs of the present invention. Figures 10-13 These are all embodiments where the protrusions are located on the table legs; the tabletop is omitted.

[0027] Figure 11 yes Figure 10 A magnified structural diagram of D in the diagram.

[0028] Figure 12 This is an exploded structural diagram showing the exploded components of another embodiment of the connection structure between the column and the table leg of the present invention (the bottom of one column explodes, and the bottom of the other column is removed from the table leg).

[0029] Figure 13 yes Figure 12 A schematic diagram of the explosion structure from a different angle.

[0030] As shown in the figure:

[0031] 1. Adjustable table; 11. Upright column; 111. Inner tube; 112. Outer tube; 113. Bottom plate; 1131. Second threaded hole; 1132. Third threaded hole; 12. Table leg; 121. Top plate; 1211. Second rectangular through hole; 1212. First screw through hole; 1213. Third rectangular through hole; 1214. Fourth screw through hole; 122. Base box; 1221. First notch; 1222. Second notch;

[0032] 2. Protrusion; 21. First inclined surface; 22. Groove; 23. Bottom end of protrusion; 24. Middle part of protrusion; 25. Top plate of protrusion; 26. Symmetrical inclined surface.

[0033] 3. Cam clamping assembly; 31. Mounting base; 311. Lateral sliding chamber of pressure bar; 312. First rectangular through hole; 313. Circular through hole; 314. Bottom surface; 315. First threaded hole; 316. Third screw through hole; 32. Slide rod; 321. Shoulder; 33. Pressure bar; 331. Slide rod through hole; 332. Second inclined surface; 34. Cam; 341. Eccentric hole; 35. Cam hinge shaft; 351. Spring retainer; 36. Rectangular plate; 37. I-shaped block; 371. Inner groove;

[0034] 4. Connector, 41. First protrusion connecting plate, 411. Second screw through hole, 42. Second screw, 43. First screw, 44. Second protrusion connecting plate, 441. Fourth threaded hole, 45. Third screw, 46. Fourth screw. Detailed Implementation

[0035] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The image shows a first embodiment of the present invention.

[0037] The existing height-adjustable desk 1 includes a column 11 and table legs 12 connected to the column 11 at a 90-degree angle. The column 11 is generally connected to the table legs 12 at the middle of its length. The column 11 is generally a rectangular sleeve. The inner tube 111 of the rectangular sleeve is generally a fixed tube and is connected to the table legs 12. The outer tube 112 of the rectangular sleeve is generally a movable tube for height adjustment. Of course, it can also be the other way around, with the outer tube fixed and the inner tube height-adjustable, that is, the inner tube is a movable tube for height adjustment.

[0038] The connection structure between the upright and the legs of the height-adjustable table of the present invention includes a protrusion 2 at the bottom of the upright 1 and a cam clamping assembly 3 on the legs 12, or it includes a protrusion on the legs 12 and a cam clamping assembly at the bottom of the upright 1. When the upright 1 is inserted into the legs 12 for installation, the cam clamping assembly 3 is used to simultaneously clamp the protrusion 2 in both the horizontal and vertical directions to lock the upright 1 and the legs 12. This configuration can also be referred to as a fixing mechanism.

[0039] Alternatively, it can be described as including a protrusion 2 located at the bottom of the column 11, and a cam clamping assembly 3 located on the table leg 12 for laterally and vertically clamping the protrusion 2 to lock the column 1 and the table leg 12; or, it includes a protrusion 2 located on the table leg 12, and a cam clamping assembly 3 located at the bottom of the column 11 for laterally and vertically clamping the protrusion 2 to lock the column 1 and the table leg 12. The configuration described here can also be referred to as fixing.

[0040] The width at the end of the protrusion 2 is greater than the width at the middle. Both the end and middle connecting surfaces are inclined surfaces formed by a thickness on the inside and a thinner outer surface, referred to as the two first inclined surfaces 21. The cam clamping assembly 3 includes a mounting base 31 with at least one slide rod 32 on it. Two pressure strips 33 are mounted on the slide rod 32, with at least one pressure strip 33 slidingly engaging with the slide rod 32. Figure 7 As shown, one pressure strip 33 on the left can be slidably fitted onto the slide rod 32, while the other pressure strip 33 on the right can be fixed to the right end of the slide rod 32. Alternatively, both pressure strips 33 can be slidably fitted onto the slide rod 32. It is easy to understand that the specific structure of the sliding fit can be: the pressure strip 33 has a slide rod through hole 331, the slide rod through hole 331 is slidably fitted onto the slide rod 32, and the mounting base 31 has a cavity for each pressure strip 33 to slide, which can be called a pressure strip transverse sliding cavity 311. At least one cam 34 is hinged to one side of the mounting base 31 to press one of the pressure strips 33 and to compress the two pressure strips 33 laterally and vertically to the protrusion 2 inserted between the two pressure strips 33, thereby fixing the column 11 and the table leg 12 together. The mating surfaces of each pressure strip 33 and the inclined surface of the protrusion 2, i.e., the first inclined surface 21, are both inclined surfaces formed by being thinner on the inside and thicker on the outside, such as the second inclined surface 332. A lever-type lever is connected to the cam 34 for pressing or releasing the pressure on the pressure strips 33. The lever-type lever and the cam 34 can be welded or screwed together.

[0041] The center of the protrusion 2 has two symmetrical grooves 22. The mounting base 31 can be rectangular, with a rectangular through hole in the middle for inserting the protrusion 3, such as the first rectangular through hole 312. Preferably, there are two slide rods 32, fixed on the mounting bases 31 at both ends of the rectangular through hole, such as the first rectangular through hole 312. The outer ends of the two slide rods 32 are fixed to one end of a cam hinge shaft 35. That is, the outer end of one slide rod 32 is fixed to one end of a cam hinge shaft 35, and the outer end of the other slide rod 32 is fixed to the other end of a cam hinge shaft 35. Preferably, there are two cams 34, and the eccentric holes 341 of the two cams 34 are movably fitted onto the cam hinge shaft 35. The lever is preferably a rectangular plate 36, and one side of the rectangular plate 36 is fixed to the two cams 34, such as by welding.

[0042] The cam hinge shaft 35 has axial limiting structures at both ends. The axial limiting structures at both ends of the cam hinge shaft 35 are as follows: Figure 7 and Figure 9 The spring retainer 351 shown or the cotter pin (not shown in the figure) etc.

[0043] Two slide rods 32 at the end away from the cam hinge shaft 35 have shoulders 321 to prevent one of the pressure bars 33 from disengaging from the slide rod 32. The two ends of the mounting base 31 have two circular through holes that extend longitudinally through the mounting base 31 and accommodate their respective slide rods 32 and shoulders 321. The shoulders 321 are also called the big head.

[0044] Between the two cams 34 is a U-shaped block 37 fixed on the mounting base 31. The inner groove 371 of the U-shaped block 37 is a chamber for a pressure strip 33 to slide laterally. A gap may be left between the outer side of the U-shaped block 37 and the cam hinge shaft 35. A gap may be left between the two ends of the U-shaped block 37 and the two cams 34 to prevent interference between the two cams 34 and the U-shaped block 37 when they rotate. The inner groove 371 can also be called a recess.

[0045] The protrusion 2 is preferably fixed to the bottom end of the column 11, such as the bottom end of the inner tube 111. The cam clamping assembly 3 is preferably fixed to the table leg 12. The top plate 121 of the table leg 12 has a rectangular through hole for the protrusion 2 to be inserted, such as the second rectangular through hole 1211. The bottom box 122 of the table leg 12 has a notch for accommodating the mounting seat 31 of the cam clamping assembly 3, such as the first notch 1221. The first notch can be a rectangular notch. The lever-type lever of the cam clamping assembly 3, such as the rectangular flat plate 36, is pressed against the mounting seat 31 away from the bottom surface 314 of the top plate 121 of the table leg 12 when pressed. It is easy to understand that the bottom surface 314 here is the bottom surface 314 of the mounting seat 31.

[0046] The mounting base 31 and the table leg 12 can be fixed by the following specific structure: the top plate 121 of the table leg 12 has multiple holes 1212 for first screws, and the mounting base 31 has multiple holes 315 for first threads. The multiple screws, which can be called first screws 43, pass through their respective holes 1212 and are screwed into their respective holes 315.

[0047] The width of the end of protrusion 2 near the cam clamping assembly 3 is greater than the width of the middle part of protrusion 2. The width of the end plate of protrusion 2 away from the clamping assembly 3 is greater than the width of the middle part of protrusion 2 and also greater than the width of the end of protrusion 2 near the cam clamping assembly 3. The end plate of protrusion 2 away from the clamping assembly 3 is fixed to a protrusion connecting plate. The protrusion connecting plate is fixed to the bottom end plate 113 fixed to the bottom of the column 11 or the top plate 121 of the table leg 12 by multiple screws. The end face of protrusion 2 away from the cam clamping assembly 3 is a symmetrical inclined surface with a convex middle and concave sides.

[0048] The specific structure of the first embodiment of the protrusion described above is as follows: the width of the bottom end 23 of the protrusion is greater than the width of the middle part 24 of the protrusion, the width of the top plate 25 of the protrusion is greater than the width of the middle part 24 of the protrusion and greater than the width of the bottom end 23 of the protrusion, the top plate 25 of the protrusion is fixed to a connecting plate such as the first protrusion connecting plate 41 by welding, the first protrusion connecting plate 41 is fixed to the bottom end plate 113 at the bottom end of the column 11 such as the bottom end of the inner tube 111 by multiple screws such as four screws, the first protrusion connecting plate 41 has four second screw through holes 411, the bottom end plate 113 has four second threaded holes 1131, and the four second screws 42 pass through their respective second screw through holes 411 one by one and are tightened in their respective second threaded holes 1131. The bottom end plate 1113 is a rectangular bottom end plate. The bottom end face of the protrusion 2 can be as follows. Figure 9 The diagram shows a symmetrical inclined plane 28, which is lower in the middle and higher on both sides. The side shape of the bump 2 is similar to an I-shape, while the bottom end 23 of the bump is similar to an arrow shape. The bottom end 23 of the bump is also called the bottom plate of the bump or the bottom of the bump. The top plate 25 of the bump is also called the top plate of the bump.

[0049] The above-mentioned end faces, such as the bottom 23 of the protrusion and the middle part 24 of the protrusion, are both inclined surfaces formed by being thicker on the inside and thinner on the outside. This can be further elaborated as follows: Figure 9 As shown, the wall thickness, i.e., the vertical thickness, at the lower end of each groove 22 is thicker near the groove sidewall and thinner further away from the groove sidewall. In other words, the bottom wall of both grooves 22 is a first inclined surface 21, which is higher on the inside and lower on the outside. The above-mentioned mating surfaces of the pressure strip 33 and the inclined surface of the protrusion 2, i.e., the first inclined surface 21, are all inclined surfaces that are thinner on the inside and thicker on the outside. This can be further explained as follows: Figure 9 As shown, the vertical thickness of each pressure strip 33 is thinner on the inside and thicker on the outside. In other words, the bottom surface of both pressure strips 33 is a second inclined surface 332 that matches the first inclined surface 21 of the bottom wall of the groove 22 of the protrusion 2, which is lower on the outside and higher on the inside.

[0050] Figure 10 , Figure 11 , Figure 12 and Figure 13 The following is a second embodiment of the present invention.

[0051] The cam clamping assembly 3 is fixed to the bottom end of the column 11, the protrusion 2 is fixed to the table leg 12, the bottom box 122 of the table leg 12 has a notch for accommodating the protrusion connecting plate, such as the second protrusion connecting plate 44, such as the second notch 1222. The second notch 1222 can also be a rectangular notch. The top plate 121 of the table leg 12 has a rectangular through hole for the protrusion 2 to extend out, such as the third rectangular through hole 1213. The lever-type lever of the cam clamping assembly 3, such as the rectangular plate 36, is pressed tightly against an outer side wall of the column 11.

[0052] The cam clamping assembly 3 is fixed to the bottom end of the column 11 and can adopt the following specific structure: the bottom end of the column 11, such as the bottom end of the inner tube 111, can be fixed by welding or screwing a bottom plate 113, such as a rectangular bottom plate, with multiple third threaded holes 1132 on the bottom plate 113, and multiple third screw through holes 316, such as two spaced third screws 45, which pass through their respective third screw through holes 316 and are screwed into their respective third threaded holes 1132.

[0053] The protrusion 2 can be fixed to the table leg 12 in the following specific structure: the protrusion 2 can be fixed by welding or screwing to the second protrusion connecting plate 44. The top plate of the table leg 12 has multiple holes such as two fourth screw through holes 1214. The protrusion 2 extends out of the third rectangular through hole 1213. The second protrusion connecting plate 44 is accommodated in the second notch 1222 of the bottom box 122. Multiple screws such as two fourth screws 46 pass through the two fourth screw through holes 1214 and are screwed into the two fourth threaded holes 441 on the second protrusion connecting plate 44.

[0054] like Figure 12 and Figure 13 As shown, see also Figure 7 and Figure 9 The specific structure of the second embodiment of the bump description in the seventh paragraph from the top is as follows: the width of the top of the bump is greater than the width of the middle of the bump, the width of the bottom plate of the bump is greater than the width of the middle of the bump and greater than the width of the top of the bump, and the top surface of the bump 2 can be a symmetrical inclined surface that is high in the middle and low on both sides.

[0055] Apart from the content described in the four paragraphs above, the other structures of the second embodiment are the same as or symmetrical to those of the first embodiment.

[0056] For ease of description, the first protrusion connecting plate 41, the second protrusion connecting plate 44, the first screw 43, the second screw 42, the third screw 45, and the fourth screw 46 can be collectively referred to as connector 4. The first screw 43, the second screw 42, the third screw 45, and the fourth screw 46 can all be countersunk screws. The first screw through hole 1212, the second screw through hole 411, the third screw through hole 316, and the fourth screw through hole 1214 can all be countersunk screw through holes, so that the large head of the assembled screw does not protrude outward, thus improving the stability, firmness, and aesthetics of the connection structure.

[0057] The above-described specific structure of the present invention may have the following variations, but the above-described specific structure is preferred.

[0058] The cam can be a single unit, located at the middle of both ends of the mounting base, and the middle of the mounting base does not have a U-shaped block.

[0059] The slide bar can be a single rod, located at the middle of both ends of the mounting base. The two ends of the slide bar can be fixed on one side of the mounting base and on the cam hinge shaft on the other side of the mounting base. A slide bar through hole is provided in the middle of the two pressure bars, and the two ends of the two pressure bars slide in their respective sliding chambers. At this time, there can be two cams distributed on both sides of the slide bar, and the cam hinge shaft can be directly fixed on one side of the mounting base.

[0060] The upright 11 can be referred to as the table leg, and the table foot 12 can be referred to as the base, foot plate, or foot bottom plate, etc. In addition to those already specified, the fixing methods can include interference fit between the shaft and hole, welding, screw connection, or bolt and nut connection, etc.

[0061] 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.

[0062] 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: It includes a protrusion at the bottom of the column and a cam clamping assembly on the table leg, or it includes a protrusion on the table leg and a cam clamping assembly at the bottom of the column. When the column is inserted into the table leg for installation, the cam clamping assembly is used to simultaneously squeeze the protrusion in both the horizontal and vertical directions to lock the column and the table leg. The width of the end of the protrusion is greater than the width of the middle part, and the two connecting surfaces of the end and the middle part are both inclined surfaces formed by being thicker on the inside and thinner on the outside; the cam clamping assembly includes a mounting base with at least one slide rod on the mounting base and two pressure strips mounted on the slide rod, wherein at least one pressure strip slides in cooperation with the slide rod. The mounting base has a chamber for each pressure strip to slide. At least one cam is hinged to one side of the mounting base for pressing one of the pressure strips and for pressing the two pressure strips laterally and vertically to insert the protrusion between the two pressure strips, thereby fixing the column and the table leg to each other. The mating surfaces of each pressure strip and the inclined surface of the protrusion are both inclined surfaces formed by being thinner on the inside and thicker on the outside. A lever-type lever is connected to the cam for pressing or releasing the pressing of the pressure strip.

2. The connection structure between the upright and the legs of the height-adjustable table according to claim 1, characterized in that: The center of the protrusion has two symmetrical grooves; the mounting base is rectangular with a rectangular through hole in the middle for inserting the protrusion; there are two slide rods, which are fixed on the mounting bases at both ends of the rectangular through hole; the outer ends of the two slide rods are fixed to one end of a cam hinge shaft; there are two cams, and the eccentric holes of the two cams are movably fitted onto the cam hinge shaft; the lever is a rectangular plate, and one side of the rectangular plate is fixed to the two cams.

3. The connection structure between the upright and the legs of the height-adjustable table according to claim 2, characterized in that: The cam hinge shaft has axial limiting structures at both ends.

4. The connection structure between the upright and the legs of the height-adjustable table according to claim 2, characterized in that: Two slide rods at the end away from the cam hinge shaft have shoulders to prevent one of the pressure bars from detaching from the slide rod. At both ends of the mounting base, there are two circular through holes that extend longitudinally through the mounting base and accommodate the slide rods and shoulders.

5. The connection structure between the upright and the legs of the height-adjustable table according to claim 2, characterized in that: Between the two cams is a U-shaped block fixed on the mounting base, and the inner groove of the U-shaped block is a chamber for a pressure bar to slide laterally.

6. The connection structure between the upright and the legs of the height-adjustable table according to claim 1, characterized in that: The protrusion is fixed to the bottom of the column, and the cam clamping assembly is fixed to the table leg. The top plate of the table leg has a rectangular through hole for the protrusion to be inserted, and the bottom box of the table leg has a notch for accommodating the mounting seat of the cam clamping assembly. When the lever of the cam clamping assembly is in the clamping state, it is close to the bottom surface of the mounting seat away from the top plate of the table leg.

7. The connection structure between the upright and the legs of the height-adjustable table according to claim 1, characterized in that: The cam clamping assembly is fixed to the bottom of the column, the protrusion is fixed to the table leg, the bottom box of the table leg has a notch for accommodating the protrusion connecting plate, the top plate of the table leg has a rectangular through hole for the protrusion to extend out, and the lever of the cam clamping assembly is pressed against an outer side wall of the column.

8. The connection structure between the upright and the legs of the height-adjustable table according to claim 1, characterized in that: The width of the end of the protrusion near the cam clamping assembly is greater than the width of the middle part of the protrusion. The width of the end plate of the protrusion away from the clamping assembly is greater than the width of the middle part of the protrusion and also greater than the width of the end of the protrusion near the cam clamping assembly. The end plate of the protrusion away from the clamping assembly is fixed to a protrusion connecting plate. The protrusion connecting plate is fixed to the bottom plate of the column or the top plate of the table leg by multiple screws.

9. The connection structure between the upright and the legs of the height-adjustable table according to claim 8, characterized in that: The end face of the protrusion away from the cam clamping assembly is a symmetrical inclined surface that is convex in the middle and concave on both sides.

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