Lifting device

Abstract

This invention provides a lifting device, comprising: a lifting frame; a first support member and a second support member, spaced apart on the bottom surface or inner side of the lifting frame, the first support member including a first leg and a second leg adjustable to cooperate with the first leg, the second leg being connected to the lifting frame; the second support member including a third leg and a fourth leg adjustable to cooperate with the third leg, the fourth leg being connected to the lifting frame; a driving mechanism including a motor assembly connected to the second leg and a lead screw drivingly cooperating with the motor assembly, a nut assembly fixed on the first leg and drivingly cooperating with the lead screw; and a stroke assembly including a mounting plate and an upper position switch and a lower position switch spaced apart on the mounting plate, the top of the mounting plate being connected to the motor assembly, and the nut assembly located between the upper and lower position switches. The technical solution of this application effectively solves the problem of low assembly efficiency of electric lifting tables in related technologies.

Description

Technical Field

[0001] This invention relates to the field of electric furniture technology, and more specifically, to a lifting device. Background Technology

[0002] An electric height-adjustable desk is a type of office desk that can be adjusted in height according to the user's height, sitting posture, or standing posture. The structure of an electric height-adjustable desk generally includes a tabletop, crossbeam, base, height-adjustable column, and motor. The motor is located outside the column and drives a rotating shaft to rotate, which in turn drives the lifting mechanism inside the column, thus raising or lowering the column. Height adjustment of this type of desk is typically controlled by a manual switch and a software-based control box to control the motor's movement. These desks are relatively expensive.

[0003] To reduce costs, some publicly available technologies have proposed solutions that directly use position switches to control the height adjustment of the lifting table, such as connecting the position switches directly to the inner wall of the column. However, this solution requires additional tools and screws and is relatively difficult to install, resulting in low assembly efficiency for electric lifting tables. Summary of the Invention

[0004] The main objective of this invention is to provide a lifting device to solve the problem of low assembly efficiency of electric lifting tables in related technologies.

[0005] To achieve the above objectives, the present invention provides a lifting device, comprising: a lifting frame; a first support member and a second support member, spaced apart on the bottom surface or inner side of the lifting frame, the first support member including a first leg and a second leg adjustable to cooperate with the first leg, the second leg being connected to the lifting frame; the second support member including a third leg and a fourth leg adjustable to cooperate with the third leg, the fourth leg being connected to the lifting frame; a driving mechanism including a motor assembly connected to the second leg and a lead screw drivingly cooperating with the motor assembly, a nut assembly fixed on the first leg and drivingly cooperating with the lead screw; and a stroke assembly including a mounting plate and an upper position switch and a lower position switch spaced apart on the mounting plate, the top end of the mounting plate being connected to the motor assembly, the nut assembly being located between the upper position switch and the lower position switch, wherein the lead screw rotates relative to the nut assembly to drive the second leg and the fourth leg to lift and lower, and the nut assembly has an upper limit position that cooperates with the upper position switch and a lower limit position that cooperates with the lower position switch.

[0006] Furthermore, the first leg is the first inner tube, the second leg is the first outer tube that is adjustablely fitted outside the first inner tube, the third leg is the second inner tube, the fourth leg is the second outer tube that is adjustablely fitted outside the second inner tube, and the mounting plate passes through the nut assembly and the first inner tube.

[0007] Furthermore, the nut assembly includes a nut and a frame surrounding the nut. The frame is fixed inside the first inner tube. The mounting plate is located between the inner side of the frame and the outer side of the nut. A trigger is provided on the nut, which can be triggered and engaged with the upper position switch and the lower position switch.

[0008] Furthermore, the trigger includes a first inclined portion and a second inclined portion connected to the outer wall surface of the nut. The bottom of the first inclined portion protrudes from the top of the first inclined portion and engages with the upper position switch trigger. The top of the second inclined portion protrudes from the bottom of the second inclined portion and engages with the lower position switch trigger.

[0009] Furthermore, the nut assembly also includes a connecting plate connected to the opening of the frame, the connecting plate being provided with a clearance hole for the mounting plate, the clearance hole being guided and engaged with the mounting plate; the mounting plate includes a plate body and a guide rib provided on the side wall of the plate body, the clearance hole having a guide groove on the hole wall that is guided and engaged with the guide rib.

[0010] Furthermore, the mounting plate includes a plate body and a first connecting piece disposed at the top of the plate body. The first connecting piece is disposed at an angle to the plate body and is connected to the top of the motor assembly through a positioning structure.

[0011] Furthermore, the mounting plate also includes a second connecting piece disposed at the bottom end of the plate body. The second connecting piece is disposed at an angle to the plate body. The bottom of the lead screw has a connecting post and a stop portion connected to the connecting post. The diameter of the connecting post is smaller than the diameter of the lead screw. The stop portion protrudes from the side wall of the connecting post. The second connecting piece is sleeved on the outside of the connecting post and stops and cooperates with the stop portion.

[0012] Furthermore, the second connecting piece includes a first piece connected to the bottom end of the plate body and a second piece stacked and snapped together with the first piece. The first piece is sleeved on the outside of the connecting post and has a first notch for the connecting post to pass through. The second piece is sleeved on the outside of the connecting post and has a second notch for the connecting post to pass through.

[0013] Furthermore, the first notch includes a first circular hole section that mates with the connecting post and a first through section that connects the first circular hole section to the outside of the first piece. The width of the first through section is smaller than the diameter of the first circular hole section. The second notch includes a second circular hole section that mates with the connecting post and a second through section that connects the second circular hole section to the outside of the second piece. The width of the second through section is smaller than the diameter of the second circular hole section. The first piece is provided with a first locking platform that engages with the second through section, and the second piece is provided with a second locking platform that engages with the first through section.

[0014] Furthermore, the sidewalls of the first card platform and the first through section gradually expand from the inside of the first piece to the outside of the first piece, and the sidewalls of the second card platform and the second through section gradually expand from the inside of the second piece to the outside of the second piece.

[0015] Furthermore, the travel assembly also includes a circuit board connected to the mounting plate, and both the upper and lower position switches are connected to the circuit board; the outer wall of the second connecting piece is provided with a lug structure; the motor assembly includes a fixed frame, a motor, and a gear transmission structure, the fixed frame is connected to the first outer tube, the motor and the gear transmission structure are both mounted on the fixed frame, the motor drives the lead screw to rotate through the gear transmission structure, and the first connecting piece is connected to the top of the fixed frame through a positioning structure; the lifting frame includes a table and a crossbeam set at the bottom of the table, the second leg is connected to the crossbeam, the fourth leg is connected to the crossbeam, and the fixed frame is connected to the crossbeam; the lifting device also includes a first base connected to the bottom of the first inner tube and a second base connected to the bottom of the second inner tube.

[0016] According to the technical solution of this invention, the lifting device includes: a lifting frame, a first support member, a second support member, a drive mechanism, and a stroke assembly. The first and second support members are spaced apart and disposed on the bottom surface or inner side of the lifting frame. The first support member includes a first leg and a second leg that is adjustable and engages with the first leg; the second leg is connected to the lifting frame. The second support member includes a third leg and a fourth leg that is adjustable and engages with the third leg; the fourth leg is connected to the lifting frame. The drive mechanism includes a motor assembly connected to the second leg and a lead screw that engages with the motor assembly. A nut assembly that engages with the lead screw is fixed on the first leg. The stroke assembly includes a mounting plate and upper and lower position switches spaced apart on the mounting plate. The top of the mounting plate is connected to the motor assembly, and the nut assembly is located between the upper and lower position switches. In this design, the motor assembly drives a lead screw to rotate, which in turn rotates relative to the nut assembly to raise and lower the second and fourth legs. The raising and lowering of the second leg drives the lifting frame to move, and positions the nut assembly at its upper limit (triggered by an upper position switch) and lower limit (triggered by a lower position switch). Since the upper and lower position switches can be pre-mounted on the mounting plate to form a travel assembly, this assembly can be directly mounted onto the motor assembly, eliminating the need to separately install the upper and lower position switches on the first leg. This simplifies the installation of the travel assembly and improves the assembly efficiency of the lifting device. Therefore, the technical solution of this application addresses the problem of low assembly efficiency in related technologies for electric lifting tables. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A perspective view of an embodiment of the lifting device according to the present invention is shown after half of the lifting frame has been removed.

[0019] Figure 2 It shows Figure 1 A side view of the first support member and drive mechanism of the lifting device;

[0020] Figure 3 It shows Figure 1 A cross-sectional schematic diagram of the first support member and the drive mechanism of the lifting device;

[0021] Figure 4 It shows Figure 1 A side view of the first leg and drive mechanism of the lifting device;

[0022] Figure 5 It shows Figure 1 A three-dimensional structural diagram of the lifting device's drive mechanism, nut assembly, and stroke assembly;

[0023] Figure 6 It shows Figure 5 Enlarged schematic diagram of the drive mechanism, nut assembly, and stroke assembly of the lifting device at point A;

[0024] Figure 7 It shows Figure 5 Enlarged schematic diagram of the drive mechanism, nut assembly, and stroke assembly of the lifting device at point B;

[0025] Figure 8 It shows Figure 5 Enlarged schematic diagram of the drive mechanism, nut assembly, and stroke assembly of the lifting device at point C;

[0026] Figure 9 It shows Figure 1 A three-dimensional structural diagram of the drive mechanism, nut assembly, and stroke assembly of the lifting device from another angle;

[0027] Figure 10 It shows Figure 1 An exploded structural diagram of the drive mechanism, nut assembly, and stroke assembly of the lifting device;

[0028] Figure 11 It shows Figure 1 An exploded view of the drive mechanism, nut assembly, and stroke assembly of the lifting device from another angle.

[0029] Figure 12 It shows Figure 11 An exploded view of the second connecting piece of the drive mechanism and stroke assembly of the lifting device.

[0030] The above figures include the following reference numerals:

[0031] 10. Lifting frame; 20. First support member; 21. First inner tube; 22. First outer tube; 30. Second support member; 31. Second inner tube; 32. Second outer tube; 40. Drive mechanism; 41. Motor assembly; 411. Fixing frame; 412. Motor; 413. Gear transmission structure; 42. Lead screw; 421. Connecting column; 422. Stop; 50. Nut assembly; 51. Nut; 52. Frame; 53. Trigger; 531. First inclined section; 532. Second inclined section; 54. Connecting plate; 55. Clearance hole; 551. Guide groove; 60. Stroke Components; 61. Mounting plate; 611. Plate body; 612. Guide rib; 613. First connecting piece; 614. Second connecting piece; 6141. First piece body; 61411. First circular hole section; 61412. First through section; 61413. First locking platform; 6142. Second piece body; 61421. Second circular hole section; 61422. Second through section; 61423. Second locking platform; 6143. Lug structure; 62. Upper position switch; 63. Lower position switch; 64. Circuit board; 70. Positioning structure; 81. First base; 82. Second base. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] like Figures 1 to 8 As shown, the lifting device in this embodiment includes: a lifting frame 10, a first support member 20, a second support member 30, a drive mechanism 40, and a stroke assembly 60. The first support member 20 and the second support member 30 are spaced apart and disposed on the bottom surface or inner side of the lifting frame 10. The first support member 20 includes a first leg and a second leg that is positionally adjustable and cooperates with the first leg. The second leg is connected to the lifting frame 10. The second support member 30 includes a third leg and a fourth leg that is positionally adjustable and cooperates with the third leg. The fourth leg is connected to the lifting frame 10. The drive mechanism 40 includes a motor assembly 41 connected to the second leg and a lead screw 42 that drives the motor assembly 41. A nut assembly 50 that is transmissionally cooperates with the lead screw 42 is fixed on the first leg. The stroke assembly 60 includes a mounting plate 61 and an upper position switch 62 and a lower position switch 63 spaced apart on the mounting plate 61. The top end of the mounting plate 61 is connected to the motor assembly 41, and the nut assembly 50 is located between the upper position switch 62 and the lower position switch 63. The lead screw 42 rotates relative to the nut assembly 50 to drive the second and fourth legs to rise and fall, and to give the nut assembly 50 an upper limit position that engages with the upper position switch 62 and a lower limit position that engages with the lower position switch 63. This prevents the second leg from exceeding the limit range and avoids damage to the internal structure of the leg.

[0036] Applying the technical solution of this embodiment, the travel assembly 60 includes a mounting plate 61 and an upper position switch 62 and a lower position switch 63 spaced apart on the mounting plate 61. The top end of the mounting plate 61 is connected to the motor assembly 41, and the nut assembly 50 is located between the upper position switch 62 and the lower position switch 63. The motor assembly 41 drives the lead screw 42 to rotate, and the lead screw 42 can rotate relative to the nut assembly 50 to drive the second and fourth legs to rise and fall. The rising and falling of the second leg can drive the lifting frame 10 to rise and fall, and give the nut assembly 50 an upper limit position that engages with the upper position switch 62 and a lower limit position that engages with the lower position switch 63. Thus, since the upper position switch 62 and the lower position switch 63 can be pre-installed on the mounting plate 61 to form a travel assembly 60, the travel assembly 60 can be directly assembled onto the motor assembly 41 without separately installing the upper position switch 62 and the lower position switch 63 onto the first leg, making the installation of the travel assembly 60 convenient and improving the assembly efficiency of the lifting device. Therefore, the technical solution of this embodiment can solve the problem of low assembly efficiency of electric height-adjustable tables in related technologies. The aforementioned lifting device is preferably a height-adjustable table.

[0037] It should be noted that the nut assembly 50 being located between the upper position switch 62 and the lower position switch 63 means that the nut assembly 50 can not only move within the area formed by the upper position switch 62 and the lower position switch 63, but also that when the nut assembly 50 is in the upper position switch 62, the center of the nut assembly 50 and the center of the upper position switch 62 can be on the same horizontal line, and when the nut assembly 50 is in the lower limit position, the center of the nut assembly 50 and the center of the lower position switch 63 can be on the same horizontal line.

[0038] It should also be noted that the lifting table is in its highest state when the nut assembly 50 is in its lower limit position, and in its lowest state when the nut assembly 50 is in its upper limit position. That is, the distance between the top surface of the lifting frame of the lifting table and the ground when it is in its highest state is greater than the distance between the top surface of the lifting frame of the lifting table and the ground when it is in its lowest state.

[0039] In this embodiment, the lifting frame 10 may consist only of a crossbeam, with the second leg connected to the inner side of the crossbeam and the fourth leg connected to the inner side of the crossbeam. Alternatively, in other embodiments, the lifting frame may consist only of a tabletop, with the second leg connected to the bottom surface of the tabletop and the fourth leg connected to the bottom surface of the tabletop. The lifting frame may also include a tabletop and a crossbeam, with the crossbeam located at the bottom of the tabletop, and the second and fourth legs connected to the crossbeam.

[0040] like Figures 1 to 5As shown, the first leg is the first inner tube 21, the second leg is the first outer tube 22, which is adjustablely fitted outside the first inner tube 21, the third leg is the second inner tube 31, and the fourth leg is the second outer tube 32, which is adjustablely fitted outside the second inner tube 31. In this way, the first inner tube 21 and the first outer tube 22 are nested together to prevent the first outer tube 22 from tilting during lifting. Simultaneously, the second inner tube 31 and the second outer tube 32 are nested together to prevent the second outer tube 32 from tilting during lifting. To make the lifting device compact, the mounting plate 61 passes through the nut assembly 50 and the first inner tube 21. Furthermore, the first inner tube 21 protects the mounting plate 61, preventing the upper position switch 62 and the lower position switch 63 on the mounting plate 61 from being exposed to the outside of the lifting device and causing interference.

[0041] Of course, in the embodiment shown in the figure, the first leg can be a first support rod, the second leg can be a second support rod, the third leg can be a third support rod, and the fourth leg can be a fourth support rod. A first guide structure is provided between the first support rod and the second support rod, with a first sliding groove and a first slider providing a guiding fit; a second guide structure is provided between the third support rod and the fourth support rod, with a second sliding groove and a second slider providing a guiding fit.

[0042] like Figures 1 to 8 As shown, the nut assembly 50 includes a nut 51 and a frame 52 surrounding the nut 51. The frame 52 is fixed inside the first inner tube 21, and the mounting plate 61 is located between the inner side of the frame 52 and the outer side of the nut 51. A trigger element 53 is provided on the nut 51. In order for the nut assembly 50 to have an upper limit position that triggers with the upper position switch 62 and a lower limit position that triggers with the lower position switch 63, the trigger element 53 can trigger with both the upper position switch 62 and the lower position switch 63.

[0043] Specifically, the frame 52 includes a surrounding plate surrounding the nut 51 and a connecting rib disposed between the outer side wall of the nut 51 and the inner side wall of the surrounding plate, so that the nut 51 can be stably located within the frame 52.

[0044] like Figure 9 and Figure 10As shown, the trigger 53 includes a first inclined portion 531 and a second inclined portion 532 connected to the outer wall surface of the nut 51. The bottom of the first inclined portion 531 protrudes from the top of the first inclined portion 531 and engages with the upper position switch 62. Thus, as the upper position switch 62 on the mounting plate 61 rises with the first outer tube 22, the contact of the upper position switch 62 gradually contacts the top to the bottom of the first inclined portion 531, so that the first inclined portion 531 is completely pressed against the contact of the upper position switch 62, thereby effectively triggering the upper position switch 62 and stopping the nut assembly 50 at the upper limit position. The top of the second inclined portion 532 protrudes from the bottom of the second inclined portion 532 and engages with the lower position switch 63. As the first outer tube 22 descends, the contacts of the lower position switch 63 on the mounting plate 61 gradually contact each other from the bottom to the top of the second inclined section 532, so that the second inclined section 532 is completely pressed on the contacts of the lower position switch 63, thereby effectively triggering the lower position switch 63 and stopping the nut assembly 50 at the lower limit position.

[0045] like Figure 6 and Figure 11 As shown, the nut assembly 50 also includes a connecting plate 54 connected to the opening of the frame 52. The mounting plate 61 passes through the nut assembly 50 and the first inner tube 21. To allow the nut assembly 50 to avoid the mounting plate 61, the connecting plate 54 is provided with a clearance hole 55 to avoid the mounting plate 61. Simultaneously, to allow the mounting plate 61 to move along a predetermined track during the lifting and lowering process with the first outer tube 22, the clearance hole 55 is guided to engage with the mounting plate 61. The mounting plate 61 includes a plate body 611 and guide ribs 612 provided on the side wall of the plate body 611. The wall of the clearance hole 55 is provided with a guide groove 551 that guides and engages with the guide ribs 612. Thus, the guide ribs 612 and the guide groove 551 can form a predetermined track, preventing deflection and making the lifting and lowering of the mounting plate 61 more stable, thereby increasing the stability of the lifting device.

[0046] like Figure 7 and Figure 11 As shown, the mounting plate 61 includes a plate body 611 and a first connecting piece 613 disposed at the top of the plate body 611. To facilitate the connection of the first connecting piece 613 to the top of the motor assembly 41, the first connecting piece 613 is angled relative to the plate body 611, and is connected to the top of the motor assembly 41 via a positioning structure 70. In this way, the first connecting piece 613 can be correctly installed on the top of the motor assembly 41 via the positioning structure 70, improving installation efficiency.

[0047] In this embodiment, specifically, the positioning structure 70 includes a boss on the top of the motor assembly 41 and a positioning hole in the first connecting piece 613. The boss is aligned with the positioning hole, so that the first connecting piece 613 and the top of the motor assembly 41 can be installed in place without the need for screws, which effectively improves the installation efficiency between the motor assembly 41 and the mounting plate 61.

[0048] like Figure 8 , Figure 9 and Figure 11 As shown, the mounting plate 61 also includes a second connecting piece 614 disposed at the bottom end of the plate body 611. To facilitate the connection between the second connecting piece 614 and the bottom of the lead screw 42, the second connecting piece 614 is angled to the plate body 611. The bottom of the lead screw 42 has a connecting post 421 and a stop portion 422 connected to the connecting post 421. The diameter of the connecting post 421 is smaller than the diameter of the lead screw 42, and the stop portion 422 protrudes from the side wall of the connecting post 421. The second connecting piece 614 is sleeved on the connecting post 421 and engages with the stop portion 422. Thus, the stop portion 422 stops the second connecting piece 614, preventing the second connecting piece 614 from moving downwards and detaching from the bottom of the lead screw 42.

[0049] like Figure 8 , Figure 9 , Figure 11 as well as Figure 12 As shown, the second connecting piece 614 includes a first piece 6141 connected to the bottom end of the plate body 611 and a second piece 6142 stacked and snapped together with the first piece 6141. This design simplifies the structure of the first piece 6141 and the second piece 6142, making assembly easier. The first piece 6141 is fitted onto the outside of the connecting post 421 and has a first notch for the connecting post 421 to pass through. The second piece 6142 is fitted onto the outside of the connecting post 421 and has a second notch for the connecting post 421 to pass through. This allows the connecting post 421 to pass through both the first piece 6141 and the second piece 6142, thus restricting the radial movement of the second connecting piece 614 along the connecting post 421. Simultaneously, the stop portion 422 stops the second piece 6142, preventing the second connecting piece 614 from moving downwards along the axial direction of the connecting post 421.

[0050] like Figure 8 , Figure 9 , Figure 11 as well as Figure 12As shown, the first notch includes a first circular hole segment 61411 that mates with the connecting post 421 and a first through segment 61412 that connects the first circular hole segment 61411 to the outside of the first piece 6141. The width of the first through segment 61412 is smaller than the diameter of the first circular hole segment 61411. This allows the first piece 6141 to pass directly from the outside of the connecting post 421 through the first through segment 61412 and the first circular hole segment 61411, allowing it to fit over the connecting post 421, facilitating assembly and eliminating the need to fit the first piece 6141 over the connecting post 421 from bottom to top. The second notch includes a second circular hole segment 61421 that mates with the connecting post 421 and a second through segment 61422 that connects the second circular hole segment 61421 to the outside of the second piece 6142. The width of the second through segment 61422 is smaller than the diameter of the second circular hole segment 61421. In this way, the second piece 6142 can directly pass through the second through section 61422 and the second circular hole section 61421 from the outside of the connecting post 421, allowing the second piece 6142 to be fitted over the connecting post 421, which facilitates assembly and eliminates the need to fit the second piece 6142 over the connecting post 421 from bottom to top. Furthermore, since the first piece 6141 is provided with a first locking platform 61413 that engages within the second through section 61422, and the second piece 6142 is provided with a second locking platform 61423 that engages within the first through section 61412, it is convenient to stack and snap the first piece 6141 and the second piece 6142 together, resulting in a more compact structure. At this time, the second connecting piece 614 is connected to the bottom of the lead screw 42 without screws, and the first connecting piece 613 is connected to the top of the motor assembly 41 without screws. Consequently, the mounting plate 61 is connected to the motor assembly 41 and the lead screw 42 without screws. The above installation method is simple to operate, making the lifting device very convenient to assemble and disassemble, and the cost is also low.

[0051] like Figure 8 and Figure 12As shown, to ensure a more secure connection between the second through segment 61422 and the first locking platform 61413, and a more secure connection between the first through segment 61412 and the second locking platform 61423, the sidewalls of both the first locking platform 61413 and the first through segment 61412 gradually expand from the inside of the first piece 6141 to the outside of the first piece 6141. Similarly, the sidewalls of both the second locking platform 61423 and the second through segment 61422 gradually expand from the inside of the second piece 6142 to the outside of the second piece 6142. In this way, as the first locking platform 61413 is inserted into the second through section 61422 from the outside of the first piece 6141 to the inside of the first piece 6141, the side wall of the first locking platform 61413 and the side wall of the second through section 61422 are pressed together more and more tightly, ensuring the locking effect of the first locking platform 61413 into the second through section 61422. Similarly, the locking effect of the second locking platform 61423 into the first through section 61412 is also ensured.

[0052] like Figures 3 to 11 As shown, to facilitate easy energization of both the upper position switch 62 and the lower position switch 63, the travel assembly 60 also includes a circuit board 64 connected to the mounting plate 61. Both the upper position switch 62 and the lower position switch 63 are connected to the circuit board 64. Figures 9 to 12 As shown, in order to facilitate the handling of the second connecting piece 614, the outer wall surface of the second connecting piece 614 is provided with a lug structure 6143. Specifically, there are multiple lug structures 6143, a portion of which is disposed on the first piece 6141, and another portion of which is disposed on the second piece 6142.

[0053] like Figures 1 to 5 , Figures 9 to 11 As shown, the motor assembly 41 includes a fixed frame 411, a motor 412, and a gear transmission structure 413. The fixed frame 411 is connected to the first outer tube 22. The motor 412 and the gear transmission structure 413 are both mounted on the fixed frame 411. The motor 412 drives the lead screw 42 to rotate through the gear transmission structure 413. The first connecting piece 613 is connected to the top of the fixed frame 411 through a positioning structure 70. Specifically, the lifting frame 10 may only include a crossbeam, a second leg connected to the crossbeam, and a fourth leg connected to the crossbeam. The fixed frame 411 includes folding plates and a housing that are spaced apart and connected to the crossbeam. The first connecting piece 613 is connected to the top of the housing through the positioning structure 70. The motor 412 is connected to the folding plate. The gear assembly of the gear transmission structure 413 is located inside the housing. The transmission rod of the gear transmission structure 413 is used to transmit the rotation of the motor 412 to the gear assembly, and the gear assembly drives the lead screw 42 to rotate. To facilitate the support of the first inner tube 21 and the second inner tube 31 respectively, the lifting device also includes a first base 81 connected to the bottom of the first inner tube 21 and a second base 82 connected to the bottom of the second inner tube 31.

[0054] The lifting device of this embodiment has a set of stroke components and its installation method, which can be adapted to different lifting tables. The lifting table with this set of stroke components can eliminate the need for a manual switch and a control box with software, resulting in lower cost. Furthermore, even if it ages or is damaged during use, replacement and maintenance are simple and quick.

[0055] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0058] 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 lifting device, characterized in that, include: The lifting frame (10) includes a table and a crossbeam disposed at the bottom of the table; The first support member (20) and the second support member (30) are spaced apart on the bottom surface or inner side of the lifting frame (10). The first support member (20) includes a first leg and a second leg that is adjustable to cooperate with the first leg. The second leg is connected to the lifting frame (10). The second support member (30) includes a third leg and a fourth leg that is adjustable to cooperate with the third leg. The fourth leg is connected to the lifting frame (10). The drive mechanism (40) includes a motor assembly (41) connected to the second leg and a lead screw (42) that drives the motor assembly (41). A nut assembly (50) that drives the lead screw (42) is fixed on the first leg. The travel assembly (60) includes a mounting plate (61) and an upper position switch (62) and a lower position switch (63) spaced apart on the mounting plate (61). The top of the mounting plate (61) is connected to the motor assembly (41), and the nut assembly (50) is located between the upper position switch (62) and the lower position switch (63). The lead screw (42) rotates relative to the nut assembly (50) to drive the second leg and the fourth leg to rise and fall, and to give the nut assembly (50) an upper limit position that is triggered by the upper position switch (62) and a lower limit position that is triggered by the lower position switch (63). The mounting plate (61) includes a plate body (611) and a first connecting piece (613) disposed at the top of the plate body (611). The first connecting piece (613) is disposed at an angle to the plate body (611). The first connecting piece (613) is connected to the top of the motor assembly (41) through a positioning structure (70). The mounting plate (61) further includes a second connecting piece (614) disposed at the bottom end of the plate body (611). The second connecting piece (614) is disposed at an angle to the plate body (611). The bottom of the lead screw (42) has a connecting post (421) and a stop part (422) connected to the connecting post (421). The diameter of the connecting post (421) is smaller than the diameter of the lead screw (42). The stop part (422) protrudes from the side wall of the connecting post (421). The second connecting piece (614) is sleeved on the outside of the connecting post (421) and stops and cooperates with the stop part (422).

2. The lifting device according to claim 1, characterized in that, The first leg is a first inner tube (21), the second leg is a first outer tube (22) that is adjustablely fitted outside the first inner tube (21), the third leg is a second inner tube (31), the fourth leg is a second outer tube (32) that is adjustablely fitted outside the second inner tube (31), and the mounting plate (61) passes through the nut assembly (50) and the first inner tube (21).

3. The lifting device according to claim 2, characterized in that, The nut assembly (50) includes a nut (51) and a frame (52) surrounding the nut (51). The frame (52) is fixed inside the first inner tube (21). The mounting plate (61) is located between the inner side of the frame (52) and the outer side of the nut (51). A trigger (53) is provided on the nut (51). The trigger (53) can be triggered and cooperate with the upper position switch (62) and the lower position switch (63).

4. The lifting device according to claim 3, characterized in that, The trigger (53) includes a first inclined portion (531) and a second inclined portion (532) connected to the outer wall of the nut (51). The bottom of the first inclined portion (531) protrudes from the top of the first inclined portion (531) and engages with the upper position switch (62). The top of the second inclined portion (532) protrudes from the bottom of the second inclined portion (532) and engages with the lower position switch (63).

5. The lifting device according to claim 3, characterized in that, The nut assembly (50) further includes a connecting plate (54) connected to the opening of the frame (52), the connecting plate (54) being provided with a clearance hole (55) to avoid the mounting plate (61), the clearance hole (55) being guided and engaged with the mounting plate (61); The mounting plate (61) includes a plate body (611) and a guide rib (612) provided on the side wall of the plate body (611). The clearance hole (55) has a guide groove (551) that guides and cooperates with the guide rib (612).

6. The lifting device according to claim 1, characterized in that, The second connecting piece (614) includes a first piece (6141) connected to the bottom end of the plate body (611) and a second piece (6142) stacked and snapped together with the first piece (6141). The first piece (6141) is sleeved on the outside of the connecting post (421) and has a first notch for the connecting post (421) to pass through. The second piece (6142) is sleeved on the outside of the connecting post (421) and has a second notch for the connecting post (421) to pass through.

7. The lifting device according to claim 6, characterized in that, The first notch includes a first circular hole segment (61411) that mates with the connecting post (421) and a first through segment (61412) that connects the first circular hole segment (61411) to the outside of the first piece (6141). The width of the first through segment (61412) is smaller than the diameter of the first circular hole segment (61411). The second notch includes a second circular hole segment (61421) that mates with the connecting post (421) and a first through segment (61412) that connects the second circular hole segment (61411) to the outside of the first piece (6141). 421) A second through section (61422) that communicates with the outside of the second piece (6142), the width of the second through section (61422) is smaller than the diameter of the second circular hole section (61421), the first piece (6141) is provided with a first locking platform (61413) that is inserted into the second through section (61422), and the second piece (6142) is provided with a second locking platform (61423) that is inserted into the first through section (61412).

8. The lifting device according to claim 7, characterized in that, The sidewalls of the first card platform (61413) and the first through section (61412) gradually expand from the inside of the first piece (6141) to the outside of the first piece (6141). The sidewalls of the second card platform (61423) and the second through section (61422) gradually expand from the inside of the second piece (6142) to the outside of the second piece (6142).

9. The lifting device according to claim 2, characterized in that, The travel assembly (60) also includes a circuit board (64) connected to the mounting plate (61), and the upper position switch (62) and the lower position switch (63) are both connected to the circuit board (64). The outer wall surface of the second connecting piece (614) is provided with a lug structure (6143). The motor assembly (41) includes a fixed frame (411), a motor (412), and a gear transmission structure (413). The fixed frame (411) is connected to the first outer tube (22). The motor (412) and the gear transmission structure (413) are both mounted on the fixed frame (411). The motor (412) drives the lead screw (42) to rotate through the gear transmission structure (413). The first connecting piece (613) is connected to the top of the fixed frame (411) through the positioning structure (70). The second leg is connected to the crossbeam, the fourth leg is connected to the crossbeam, and the fixing frame (411) is connected to the crossbeam; The lifting device further includes a first base (81) connected to the bottom of the first inner tube (21) and a second base (82) connected to the bottom of the second inner tube (31).

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