Lifting column and electric lifting table

Abstract

This invention discloses a lifting column and an electric lifting table, belonging to the field of linear actuators. It solves the problem of excessive swaying of the cable inside the lifting column, which easily generates noise. The lifting column of this invention includes a sleeve assembly, a transmission assembly for driving the extension and retraction of the sleeve assembly, and a spiral cable axially passing through the sleeve assembly. The lifting column also includes a first fixing part, a second fixing part, and a third fixing part connected sequentially along the spiral cable axially. The first fixing part and the second fixing part generate axial relative displacement with the extension and retraction movement of the transmission assembly to stretch or contract the spiral cable between them. The second fixing part and the third fixing part generate axial relative displacement with the extension and retraction movement of the transmission assembly to stretch or contract the spiral cable between them.

Description

[Technical Field]

[0001] This invention relates to the field of linear actuators, and more particularly to lifting columns and electric lifting tables. [Background Technology]

[0002] Lifting columns are common components in the field of linear drive equipment, widely used in electric height-adjustable desks, electric height-adjustable beds, and other similar devices. Taking an electric height-adjustable desk as an example, it includes a tabletop, a crossbeam located beneath the tabletop, and two lifting columns. A controller is mounted on the crossbeam, electrically connected to the motors on the two lifting columns to supply power and control their operation. Typically, a power interface is located on the crossbeam for connection to the power grid. During the tabletop's lifting motion, the cables connecting to the power interface also move with the tabletop, making the space around the electric height-adjustable desk somewhat cluttered.

[0003] To address the aforementioned issues, existing electric lifting desks conceal the cables within the lifting column. These cables extend and retract with the column to maintain power supply to the equipment. However, due to their considerable length and tendency to sway radially, these retractable cables can collide with the sleeves on the lifting column during extension and retraction, generating noise and negatively impacting the user experience. [Summary of the Invention]

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art by proposing a lifting column, which solves the problem of excessive swaying of the spiral cable inside the lifting column, which easily generates noise.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] The lifting column includes a sleeve assembly, a transmission assembly for driving the sleeve assembly to extend and retract, and a spiral cable axially passing through the sleeve assembly. The lifting column also includes a first fixing part, a second fixing part, and a third fixing part connected sequentially along the spiral cable axially. The first fixing part and the second fixing part generate axial relative displacement with the extension and retraction movement of the transmission assembly to stretch or contract the spiral cable between them. The second fixing part and the third fixing part generate axial relative displacement with the extension and retraction movement of the transmission assembly to stretch or contract the spiral cable between them.

[0007] Based on the above scheme, the transmission assembly includes a first telescopic component, a second telescopic component, and a third telescopic component that can be telescopically extended and retracted relative to each other. The first fixed wire portion and the second fixed wire portion generate axial relative displacement as the first telescopic component and the second telescopic component extend and retract relative to each other. The second fixed wire portion and the third fixed wire portion generate axial relative displacement as the second telescopic component and the third telescopic component extend and retract relative to each other.

[0008] Based on the above scheme, the first telescopic component is a first lead screw, the second telescopic component is an outer sleeve with a first transmission nut, and the third telescopic component is an inner sleeve with a second transmission nut. The outer sleeve is fitted outside the inner sleeve. The transmission assembly also includes a second lead screw fitted outside the first lead screw. The first lead screw can drive the second lead screw to rotate synchronously and can telescopically extend and retract relative to the second lead screw axially. The first lead screw is threadedly engaged with the first transmission nut, and the second lead screw is threadedly engaged with the second transmission nut.

[0009] Based on the above scheme, the lifting column also includes a driving device for driving the first lead screw to rotate, the first wire fixing part is installed on the driving device, the second wire fixing part is installed on the outer sleeve, and the third wire fixing part is installed on the sleeve assembly.

[0010] Based on the above scheme, the spiral cable is provided with a sound insulation baffle on the side.

[0011] Based on the above scheme, the sleeve assembly includes an inner tube, a middle tube, and an outer tube from the inside to the outside. When the sleeve assembly is extended, its cross-sectional area increases progressively along the setting direction of the first fixed part, the second fixed part, and the third fixed part. The length of the spiral cable between the first fixed part and the second fixed part within the blocking range of the sound insulation baffle is H1, and the length of the spiral cable between the second fixed part and the third fixed part within the blocking range of the sound insulation baffle is H2. H1 is greater than H2.

[0012] Based on the above scheme, the second wire fixing part is installed on the sound insulation baffle.

[0013] Based on the above scheme, the sound insulation baffle can extend and retract with the extension and retraction of the transmission assembly.

[0014] Based on the above scheme, the spiral cable is arranged side by side with the transmission assembly, and the first wire fixing part and / or the second wire fixing part includes a guide post extending into the sleeve assembly, and at least a portion of the spiral cable is wound around the guide post.

[0015] Based on the above scheme, the spiral cable forms an accommodating space to house the transmission assembly.

[0016] Based on the above scheme, when the transmission assembly performs telescopic movement, it transmits force to the spiral cable through the second fixed part.

[0017] Based on the above scheme, the second wire fixing part is fixedly connected to the spiral cable; or, the second wire fixing part is axially positioned on the spiral cable.

[0018] Based on the above scheme, the sleeve assembly includes an inner tube, a middle tube and an outer tube from the inside to the outside. When the sleeve assembly is extended, its cross-sectional area increases step by step along the setting direction of the first fixed part, the second fixed part and the third fixed part. The length of the spiral cable between the first fixed part and the second fixed part is less than the length of the spiral cable between the second fixed part and the third fixed part.

[0019] Based on the above scheme, an integral spiral cable is connected between the first wire fixing part and the third wire fixing part.

[0020] Based on the above solution, the second wire fixing part includes a clamping part for clamping the spiral cable; or, the second wire fixing part includes a stop part, which is located between the two turns of the spiral cable to stop the axial movement of the two turns of the cable respectively.

[0021] Based on the above scheme, the spiral cable includes a first cable and a second cable separately disposed from the first cable. The first cable is connected between the first fixing part and the second fixing part, and the second cable is connected between the second fixing part and the third fixing part. The first cable and the second cable are electrically connected.

[0022] Based on the above scheme, the second wire fixing part includes clamping parts for clamping the first cable and the second cable respectively, and the first cable and the second cable are connected to establish an electrical connection between them; or, the second wire fixing part includes a conductive module, and the first cable and the second cable are respectively connected to the conductive module to establish an electrical connection between them.

[0023] Based on the above scheme, the first wire fixing part includes a first wire clip, and the third wire fixing part includes a second wire clip. The first wire clip and the second wire clip respectively axially position the two ends of the spiral cable.

[0024] An electric height-adjustable desk includes a tabletop and a height-adjustable column as disclosed in any of the above technical solutions. A controller is provided on the tabletop, and the spiral cable is electrically connected to the controller.

[0025] The beneficial effects of this invention are:

[0026] The lifting column disclosed in this invention includes a sleeve assembly and a transmission assembly. A spiral cable is provided inside the sleeve assembly. The spiral cable can extend and retract with the extension and retraction of the transmission assembly. With this design, the spiral cables of some electrical equipment can be built into the sleeve assembly, so that the spiral cables can be routed from the inside of the lifting column, avoiding the mess caused by exposed spiral cables, and preventing users from tripping over the spiral cables when passing by.

[0027] The lifting column is equipped with a first, second, and third fixing part for axially positioning the spiral cable, allowing the spiral cable to extend and retract axially when the transmission assembly extends and retracts. Specifically, the first and second fixing parts can generate relative axial displacement as the transmission assembly extends and retracts, causing the spiral cable connected between them to extend and retract. Similarly, the third and second fixing parts can generate relative axial displacement as the transmission assembly extends and retracts, causing the spiral cable connected between them to extend and retract.

[0028] In the prior art, cables are usually directly connected between two fixed points on the upper and lower sides of the lifting column. Compared with the prior art, in this application, after the spiral cable is connected to the first fixed part, the second fixed part, and the third fixed part, it can form two independently deformable parts, namely the spiral cable between the second fixed part and the first fixed part, and the spiral cable between the third fixed part and the second fixed part. Due to the axial positioning of the three fixed parts, the axial expansion and contraction between the two cable segments will not affect each other. Compared with a longer cable, the shorter cable will produce a smaller sway amplitude, so the spiral cable is less likely to collide with the sleeve assembly and generate noise during the expansion and contraction of the transmission assembly. Even if a collision occurs, there will be no obvious noise because the sway amplitude of the two cable segments is small.

[0029] Furthermore, the transmission assembly includes a first telescopic component, a second telescopic component, and a third telescopic component that are relatively telescopic. The first and second cable-fixing portions undergo axial relative displacement as the first and second telescopic components extend and retract relative to each other. The second and third cable-fixing portions also undergo axial relative displacement as the second and third telescopic components extend and retract relative to each other. The first, second, and third telescopic components are relatively telescopic. When the first and second telescopic components extend and retract relative to each other, their total axial length changes, thereby changing the relative axial position of the first and second cable-fixing portions and ultimately altering the length of the spiral cable between them. Similarly, the relative axial position of the second and third cable-fixing portions also changes as the second and third telescopic components extend and retract relative to each other, ultimately altering the length of the spiral cable between them.

[0030] Furthermore, the first telescopic component is a first lead screw, the second telescopic component is an outer sleeve with a first transmission nut, and the third telescopic component is an inner sleeve with a second transmission nut. The outer sleeve is fitted over the inner sleeve. The transmission assembly also includes a second lead screw fitted over the first lead screw. The first lead screw can drive the second lead screw to rotate synchronously and can telescopically extend and retract relative to the second lead screw axially. The first lead screw is threadedly engaged with the first transmission nut, and the second lead screw is threadedly engaged with the second transmission nut. The first lead screw telescopically extends and retracts relative to the outer sleeve and the second lead screw during rotation by threading with the first transmission nut. During this process, the second lead screw is driven to rotate by the first lead screw. The second lead screw, through threading with the second transmission nut, drives the inner sleeve to telescopically extend and retract relative to the outer sleeve.

[0031] Furthermore, the lifting column also includes a drive device for driving the first lead screw to rotate. The first fixing part is mounted on the drive device, the second fixing part is mounted on the outer sleeve, and the third fixing part is mounted on the sleeve assembly. The first lead screw and the inner sleeve can extend and retract relative to the outer sleeve in different directions. When the transmission assembly is in the retracted state, the first lead screw, the second lead screw, and the inner sleeve are all located inside the outer sleeve. Mounting the second fixing part on the outer sleeve keeps the second fixing part relatively fixed to the outer sleeve. Mounting the first fixing part on the drive device keeps the first fixing part relatively fixed to the first lead screw. Mounting the third fixing part on the sleeve assembly allows the sleeve assembly to extend and retract synchronously with the transmission assembly, keeping the third fixing part relatively fixed to the inner sleeve.

[0032] Furthermore, a sound-insulating baffle is provided on the side of the spiral cable. The sound-insulating baffle is located between the spiral cable and the inner wall of the sleeve assembly, which can prevent the spiral cable from directly contacting the inner wall of the sleeve assembly due to shaking during the extension and contraction process. The sound-insulating baffle has good noise reduction performance, which can reduce the noise generated by the collision between the spiral cable and the baffle. Moreover, under the obstruction of the sound-insulating baffle, the shaking amplitude of the spiral cable can be reduced, and at the same time, the shaking amplitude of the spiral cable outside the range of the sound-insulating baffle can also be reduced.

[0033] Furthermore, the sleeve assembly includes an inner tube, a middle tube, and an outer tube from the inside out. In the extended state, the cross-sectional area of ​​the sleeve assembly increases progressively along the setting direction of the first fixed part, the second fixed part, and the third fixed part. The length of the spiral cable between the first fixed part and the second fixed part within the blocking range of the sound insulation baffle is H1, and the length of the spiral cable between the second fixed part and the third fixed part within the blocking range of the sound insulation baffle is H2. H1 is greater than H2. After the sleeve assembly is extended, the portion of the spiral cable between the first and second fixing parts is located in the inner tube, while the portion of the spiral cable between the second and third fixing parts is located in the outer tube. The inner diameter of the inner tube is smaller than that of the outer tube, making it easier for the spiral cable inside the inner tube to collide with the inner tube wall. By designing H1 to be larger than H2, the blocking effect of the sound insulation baffle on the spiral cable between the first and second fixing parts can be enhanced, making the swaying amplitude of the spiral cable between the first and second fixing parts smaller than that between the second and third fixing parts. This reduces the swaying amplitude of the spiral cable inside the inner tube, making it less likely to contact the inner tube wall. Although the swaying amplitude of the spiral cable inside the outer tube is greater, the larger space inside the outer tube also makes it less likely for the spiral cable to contact the outer tube wall.

[0034] Furthermore, the second cable fixing part is mounted on the sound insulation baffle. During the extension or retraction of the transmission assembly, the relative position of the sound insulation baffle and the second cable fixing part remains unchanged, thereby simultaneously maintaining the blocking effect on the spiral cable between the first and second cable fixing parts, and on the spiral cable between the second and third cable fixing parts.

[0035] Furthermore, the soundproof baffle can extend and retract with the extension and retraction of the transmission assembly. The retractable soundproof baffle can extend after the transmission assembly extends, thereby increasing its blocking effect on the spiral cable and preventing its blocking effect on the spiral cable from weakening due to the extension of the spiral cable.

[0036] Furthermore, the spiral cable is arranged side-by-side with the transmission assembly, and the first and / or second cable fixing portions include guide posts extending into the sleeve assembly, with at least a portion of the spiral cable wound around the guide posts. The spiral cable is positioned on the side of the transmission assembly, facilitating its assembly, particularly of the lifting column, and reducing interference during extension and retraction. The guide posts provide radial positioning of the spiral cable, reducing its sway and preventing it from contacting the inner wall of the sleeve assembly.

[0037] Furthermore, the spiral cable forms an accommodating space for the transmission assembly. The spiral cable is positioned on the outer periphery of the transmission assembly, reducing the space required for its arrangement and thus decreasing the volume of the lifting column. Simultaneously, the transmission assembly can radially position the spiral cable, thereby reducing its swaying amplitude.

[0038] Furthermore, when the transmission assembly performs telescopic movement, it transmits force to the spiral cable through the second fixed part. During the telescopic movement of the transmission assembly, the second fixed part also experiences displacement. Through its connection with the spiral cable, the second fixed part can transmit force to the spiral cable, causing axial extension and contraction of the spiral cable connected between the second and first fixed parts, and axial extension and contraction of the spiral cable connected between the second and third fixed parts.

[0039] Furthermore, the second fixing part is fixedly connected to the spiral cable; or, the second fixing part is axially positioned on the spiral cable. If the second fixing part is fixedly connected to the spiral cable, the second fixing part and the spiral cable are relatively fixed, and there is no relative displacement between them, thus restricting the movement of the part of the spiral cable connected to the second fixing part towards the first fixing part or the third fixing part; if the second fixing part is axially positioned on the spiral cable, the second fixing part and the spiral cable move together, and their axial positions do not change, thereby restricting the movement of the part of the spiral cable connected to the second fixing part towards the first fixing part or the third fixing part. The second fixing part can connect one turn of spiral cable or multiple turns of spiral cable to simultaneously restrict the axial displacement of multiple turns of spiral cable, thereby improving the restrictive effect on the spiral cable. The multiple turns of spiral cable can be several turns of spiral cable connected to each other, or several turns of cable spaced apart. When two turns of spiral cable spaced apart are restricted, the remaining turns of spiral cable between the two turns are also restricted.

[0040] Furthermore, the sleeve assembly comprises, from the inside out, an inner tube, a middle tube, and an outer tube. In its extended state, the cross-sectional area of ​​the sleeve assembly increases progressively along the direction of the first, second, and third fixing parts. The length of the spiral cable between the first and second fixing parts is less than the length of the spiral cable between the second and third fixing parts. After the sleeve assembly is extended, a portion of the spiral cable between the first and second fixing parts is located in the inner tube, and a portion of the spiral cable between the second and third fixing parts is located in the outer tube. The inner diameter of the inner tube is smaller than the inner diameter of the outer tube. Therefore, the spiral cable in the inner tube is more likely to collide with the inner tube wall. Designing the length of the spiral cable between the first and second fixing parts to be less than the length of the spiral cable between the second and third fixing parts reduces the swaying amplitude of the spiral cable in the inner tube, making it less likely to contact the inner tube wall. Although the swaying amplitude of the spiral cable in the outer tube is greater, the larger space within the outer tube also makes it less likely for the spiral cable to contact the outer tube wall.

[0041] Furthermore, the first and third fixing parts are connected by an integral spiral cable. The spiral cable is a single, continuous spiral cable, eliminating the need for transfer points during current transmission, thus ensuring current quality. Moreover, the spiral cable will not break during expansion or contraction, preventing power transmission interruptions.

[0042] Furthermore, the spiral cable includes a first cable and a second cable separately disposed from the first cable. The first cable is connected between a first fixing part and a second fixing part, and the second cable is connected between the second fixing part and a third fixing part. The first cable and the second cable are electrically connected. The first cable and the second cable are two independent spiral cables, and the lengths of the first cable and the second cable can be selected according to the length of the lifting column to adapt to lifting columns of various sizes.

[0043] Furthermore, the second wire-fixing part includes clamping parts for clamping the first cable and the second cable respectively, the first cable and the second cable being connected to establish an electrical connection between them; or, the second wire-fixing part includes a conductive module, the first cable and the second cable being respectively connected to the conductive module to establish an electrical connection between them. The clamping parts can simultaneously clamp the first cable and the second cable, allowing the first cable and the second cable to extend and retract independently without interfering with each other. The parts of the first cable and the second cable clamped by the clamping parts are electrically connected by direct connection for power transmission. The electrically connected parts of the first cable and the second cable are kept in a fixed position under the limiting action of the clamping parts, thereby maintaining an uninterrupted wire connection between them. The conductive module has conductive properties, enabling power transmission between the first cable and the second cable connected to the conductive module. The first cable and the second cable can maintain an electrical connection with the conductive module to ensure uninterrupted power transmission.

[0044] This invention also discloses an electric height-adjustable desk, which employs the aforementioned lifting column and possesses all the beneficial effects of such a column. Electrical equipment can be placed on the desk. Because the spiral cable is concealed within the lifting column, there is no entanglement between the external spiral cable and the power cord of the equipment on the desk, preventing the power cord and external spiral cable from being pulled during desk lifting. During use, the electric height-adjustable desk generates minimal noise within the lifting column, ensuring a smooth user experience.

[0045] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0046] The invention will be further described below with reference to the accompanying drawings:

[0047] Figure 1 This is a schematic diagram of the structure of the lifting column when it is not extended in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the extended lifting column in an embodiment of the present invention;

[0049] Figure 3 This is a cross-sectional view of the lifting column in an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of the internal structure of the lifting column in an embodiment of the present invention;

[0051] Figure 5 This is an exploded view of the junction box in an embodiment of the present invention;

[0052] Figure 6 This is an exploded view of the junction box from another perspective in an embodiment of the present invention;

[0053] Figure 7 for Figure 5 Enlarged view of point A in the middle;

[0054] Figure 8 for Figure 6 Enlarged view of point B in the middle;

[0055] Figure 9 This is a schematic diagram of the connection between the spiral cable and the power interface in an embodiment of the present invention;

[0056] Figure 10 This is a schematic diagram of the transmission assembly in an embodiment of the present invention;

[0057] Figure 11 This is a schematic diagram of the spiral cable after it has been extended in an embodiment of the present invention;

[0058] Figure 12 This is a schematic diagram of another structure of the spiral cable within the sleeve assembly in an embodiment of the present invention;

[0059] Figure 13 This is a schematic diagram illustrating the interaction between the clamping part and the spiral cable in an embodiment of the present invention;

[0060] Figure 14 This is a schematic diagram illustrating the cooperation between the stop and the spiral cable in an embodiment of the present invention;

[0061] Figure 15 This is a schematic diagram showing the cooperation between the two snap-fit ​​parts and the spiral cable in an embodiment of the present invention.

[0062] Figure label:

[0063] Inner tube 100, outer tube 110, middle tube 120, fixing plate 130;

[0064] First telescopic component 200, second telescopic component 210, third telescopic component 220, drive device 230, second lead screw 240, first transmission nut 250, and second transmission nut 260;

[0065] First wire fixing part 300, guide post 301, second wire fixing part 310, third wire fixing part 320, opening 330, second wire clip 331, positioning slot 332, positioning hole 333, stop protrusion 334;

[0066] Spiral cable 400, cable routing cavity 401, accommodating space 402, first cable 410, second cable 420, positioning protrusion 430;

[0067] 500mm soundproofing baffle;

[0068] First power interface 600, junction box 610, box body 620, wiring cavity 630, first mounting hole 640, second mounting hole 650, terminal block 660, socket hole 670, pre-positioning component 680. [Specific implementation method]

[0069] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0070] The terms "exemplary" and "some embodiments" used below are meant to be "used as examples, embodiments, or illustrations," and any embodiment described as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. Numerous specific details are set forth in the following detailed description to better illustrate the invention, and those skilled in the art will understand that this disclosure can be practiced without certain specific details.

[0071] Reference Figures 1 to 4 , Figure 10 and Figure 11 This invention discloses a lifting column, which is a three-section column, including a sleeve assembly and a transmission assembly disposed within the sleeve assembly. The sleeve assembly includes an inner tube 100, an outer tube 110 disposed outside the inner tube 100, and a middle tube 120 disposed between the inner tube 100 and the outer tube 110. The transmission assembly is used to drive the sleeve assembly to extend and retract. The transmission assembly includes a first telescopic component 200, a second telescopic component 210, and a third telescopic component 220. The first telescopic component 200 and the third telescopic component 220 are disposed within the second telescopic component 210 and can extend and retract relative to the second telescopic component 210. When the transmission assembly is in the extended state, the second telescopic component 210 is located between the first telescopic component 200 and the third telescopic component 220. The lifting column also includes a drive device 230, which is a motor box containing a motor that provides the power required for the extension and retraction of the transmission assembly.

[0072] The lifting column also includes a spiral cable 400 that runs through the interior of the sleeve assembly along the extension and retraction direction of the sleeve assembly. The spiral cable 400 supplies power to the transmission assembly. The spiral cable 400 is helical with multiple turns. When the transmission assembly extends, the pitch of the spiral cable 400 increases, and the entire cable lengthens. When the transmission assembly shortens, the pitch of the spiral cable 400 decreases, and the entire cable retracts. With this design, cables for some electrical equipment can be housed within the sleeve assembly, allowing cables to be routed from inside the lifting column without causing messy exposed cables, and preventing users from tripping over cables when passing by.

[0073] The lifting column is also provided with a first fixing part 300, a second fixing part 310 and a third fixing part 320 arranged sequentially along the extension direction of the spiral cable 400 for axial positioning of the spiral cable 400. The first fixing part 300 is fixed relative to the first extension component 200, the second fixing part 310 is fixed relative to the second extension component 210, and the third fixing part 320 is fixed relative to the third extension component 220.

[0074] The first wire-fixing portion 300 can move relative to the second wire-fixing portion 310 as the first telescopic member 200 extends and retracts. The third wire-fixing portion 320 can move relative to the second wire-fixing portion 310 as the third telescopic member 220 extends and retracts. The spiral cable 400 includes a first cable 410 and a second cable 420. The first cable 410 and the second cable 420 are electrically connected to ensure uninterrupted power transmission. Both the first cable 410 and the second cable 420 can extend and retract with the extension and retraction of the transmission assembly. The first cable 410 is connected between the second wire-fixing portion 310 and the first wire-fixing portion 300 to extend and retract with the movement of the first wire-fixing portion 300. The second cable 420 is connected between the second wire-fixing portion 310 and the third wire-fixing portion 320 to extend and retract with the movement of the third wire-fixing portion 320. Figure 4 and Figure 11 As shown, the length of the first cable before extension is L1, and the length after extension is L3; the length of the second cable before extension is L2, and the length after extension is L4.

[0075] In the prior art, cables are usually directly connected between two fixed points on the upper and lower sides of the lifting column. Compared with the prior art, in this application, the spiral cable 400, after being connected by the first fixing part 300, the second fixing part 310 and the third fixing part 320, can be divided into two independently deformable parts, namely the first cable 410 and the second cable 420. Due to the axial positioning of the three fixing parts, the axial expansion and contraction between the two cable segments will not affect each other. Compared with a longer cable, the shorter first cable 410 and the second cable 420 will produce a smaller sway amplitude, so that the spiral cable 400 is less likely to collide with the sleeve assembly and generate noise during the expansion and contraction of the transmission assembly. Even if a collision occurs, the small sway amplitude of the first cable 410 and the second cable 420 will not produce obvious noise.

[0076] The inventive concept of this application lies in dividing a single cable into two independently telescopic cables, thereby reducing the swaying amplitude of a single cable segment while maintaining the overall telescopic length of the cable. In addition to three-section posts, the solution of this application can also be used for multi-section posts (at least more than two sections).

[0077] Reference Figure 4Based on the above embodiments, in one embodiment of the present invention, the spiral cable 400 between the first fixing part 300 and the third fixing part 320 is a single continuous cable. The first cable 410 is integrally formed on the second cable 420, which can ensure the quality of the current. The spiral cable 400 will not break during the extension and retraction process, thus preventing power transmission interruption. The second fixing part 310 connects the spiral cable 400 to divide the spiral cable 400 into the first cable 410 and the second cable 420.

[0078] When the transmission assembly extends or retracts, the second wire fixing part 310 transmits force to the spiral cable 400 to axially position the spiral cable 400, so that the connection between the spiral cable 400 and the second wire fixing part 310 will not have axial displacement and will move toward the first wire fixing part 300 or the third wire fixing part 320 during the extension or retraction of the transmission assembly.

[0079] In this embodiment, there are two ways in which the second wire fixing part 310 connects to the spiral cable 400:

[0080] Reference Figure 13 First, the second cable fixing part 310 includes a clamping part, which fixes the spiral cable 400 in place by clamping to restrict the movement of the clamped portion on the spiral cable 400, and to restrict the movement of the portion of the spiral cable connected to the clamping part towards the first or third cable fixing part. The clamping part provides strong and stable restriction on the spiral cable 400. For example, the clamping part can be a pressure plate installed on the second telescopic member 210, with both ends of the pressure plate connected to the second telescopic member 210. The spiral cable 400 is pressed between the pressure plate and the second telescopic member 210.

[0081] Reference Figure 14 Second: The second wire fixing part 310 includes a stop part, which only has a stopping function for the spiral cable 400. The second wire fixing part 310 is a baffle or baffle, located between the two turns of the spiral cable 400 to stop the two turns of the cable axially and to position the two turns of the cable axially. It can restrict the movement of the coil of the first cable 410 toward the third wire fixing part 320 and the movement of the coil of the second cable 420 toward the first wire fixing part 300. The stop part will not damage the spiral cable 400 and affect the current quality.

[0082] In the above, such as Figure 13 As shown, only one second fixing part can be provided. After the second fixing part is connected to the spiral cable 400, it can divide the spiral cable 320 between the first fixing part 300 and the third fixing part into two independently extendable sections; as shown Figure 15As shown, multiple second fixing parts can also be provided. The multiple second fixing parts are arranged at intervals along the extension and retraction direction of the spiral cable 400. After the multiple second fixing parts are connected to the spiral cable 400, the extension and retraction of the spiral cable 400 between the first and last two second fixing parts is restricted. This design can shorten the length of the spiral cable 400 between the first fixing part 300 and the second fixing part 310, and between the second fixing part 310 and the third fixing part 320, so as to enhance the effect of the second fixing part 310 on reducing the sway amplitude of the spiral cable 400.

[0083] Each second fixing part can transmit axial force to only one turn of the spiral cable. Under the constraint of the second fixing part, this turn of the spiral cable will not move towards the first or third fixing part during the extension and retraction of the transmission assembly, thus reducing the overall sway of the spiral cable. The second fixing part can also apply axial force to multiple turns of the spiral cable to simultaneously restrict their axial displacement, improving the restraining effect on the spiral cable. These multiple turns of the spiral cable can be several turns connected to each other or several turns spaced apart. When two spaced turns of the spiral cable are restricted, the remaining turns between them are also restricted.

[0084] Unlike the above embodiments, in another embodiment of the present invention, the first cable and the second cable are two independent spiral cables. The lengths of the first cable and the second cable can be selected according to the length of the lifting column to adapt to lifting columns of various sizes. An electrical connection is established between the first cable and the second cable for power transmission.

[0085] In this embodiment, there are two ways to connect the second fixing part to the spiral cable:

[0086] First, the second cable securing section includes clamping parts for securing the first cable and the second cable respectively. The first cable and the second cable are connected to establish an electrical connection between them. Only one clamping part can be provided, capable of simultaneously clamping both the first and second cables, allowing them to extend and retract independently without interference. The parts of the first and second cables clamped by the clamping parts are electrically connected via a direct connection for power transmission. The electrically connected parts of the first and second cables remain fixed in position under the limiting action of the clamping parts, thereby ensuring an uninterrupted wire connection between them. Alternatively, two clamping parts can be provided, one for clamping the first cable and the other for clamping the second cable.

[0087] Second, the second fixed part includes a conductive module. The first cable and the second cable are electrically connected to the conductive module to establish an electrical connection between the first cable and the second cable. The conductive module has conductive properties so that power can be transmitted between the first cable and the second cable connected to the conductive module. The first cable and the second cable can maintain an electrical connection with the conductive module to maintain relative fixation with the second telescopic component, while ensuring that the power transmission is not interrupted.

[0088] During the extension and retraction of the sleeve assembly, the inner tube 100 and outer tube 110 can extend and retract relative to the middle tube 120. The first wire fixing part 300 is fixed relative to the inner tube 100, and the third wire fixing part 320 is fixed relative to the outer tube 110. The first cable 410 can extend and retract with the extension and retraction of the inner tube 100 relative to the middle tube 120, and the second cable 420 can extend and retract with the extension and retraction of the outer tube 110 relative to the middle tube 120. When the sleeve assembly is in the extended state, part of the first cable 410 is located in the inner tube 100, and part of the second cable 420 is located in the outer tube 110. Since the inner diameter of the inner tube 100 is smaller than the inner diameter of the outer tube 110, the first cable 410 is more likely to collide with the tube wall of the inner tube 100. Based on the above embodiment, in one embodiment of the present invention, a wiring cavity 401 for arranging the spiral cable 400 is formed between one side of the transmission assembly and the sleeve assembly. The spiral cable is positioned on the side of the transmission assembly, parallel to it, to facilitate its assembly and also to facilitate the assembly of the lifting column. A guide post 301 extending into the inner tube 100 is provided on the first cable fixing part 300. The spiral cable 400 forms an accommodating space 402 for receiving the guide post 301, allowing at least a portion of the first cable 410 to be wound around the guide post 301. The guide post 301 radially limits the first cable 410, reducing its swaying length (for example, if the first cable 410 is 20cm long and the guide post 301 is 10cm long, after the first cable 410 is wound around the guide post 301, the swaying length of the first cable 410 changes from 20cm to 10cm), thus preventing the first cable 410 from easily contacting the wall of the inner tube 100. Furthermore, a guide post can also be provided on the second cable fixing part to radially limit the second cable.

[0089] Based on the above embodiments, in one embodiment of the present invention, the length of the first cable is less than the length of the second cable, that is, L1 is less than L2. With the overall length of the spiral cable remaining constant, the shorter first cable has a smaller amplitude of sway, making it less likely for the first cable to contact the inner tube wall. The second cable is longer, and therefore also has a larger amplitude of sway than the first cable. However, the space inside the outer tube is larger, so even with a larger amplitude of sway, the second cable is still less likely to contact the outer tube wall.

[0090] Reference Figure 4Based on the above embodiments, in one embodiment of the present invention, sound-insulating baffles 500 are provided on both sides of the spiral cable 400 on the second telescopic component 210. The sound-insulating baffles 500 are disposed between the spiral cable 400 and the inner wall of the sleeve assembly, which can prevent the spiral cable 400 from directly contacting the inner wall of the sleeve assembly due to shaking during the extension and retraction process. The sound-insulating baffles 500 have good noise reduction performance, which can reduce the noise generated by the collision between the spiral cable 400 and the baffle. Under the obstruction of the sound-insulating baffles 500, the shaking amplitude of the spiral cable 400 can be reduced, and at the same time, the shaking amplitude of the spiral cable 400 located outside the range of the sound-insulating baffles 500 can be reduced. During the extension or retraction of the transmission assembly, the relative position of the sound-insulating baffles 500 and the second telescopic component 210 remains unchanged, thereby maintaining the obstruction effect on the spiral cable 400.

[0091] The soundproof baffle 500 can be made of materials with vibration reduction and noise reduction properties, such as rubber.

[0092] The second cable fixing part 310 can be connected between the two sound insulation baffles 500, thus eliminating the need for a structure on the second telescopic member 210 for mounting the second cable fixing part 310. Furthermore, the first cable 410 and the second cable 420 are always partially within the blocking range of the sound insulation baffles 500, maintaining their blocking effect. Alternatively, the second cable fixing part and the sound insulation baffles can be mounted separately on the second telescopic member.

[0093] The soundproof baffle 500 is provided along the length of the second telescopic member 210 to increase the protection of the first cable 410 and the second cable 420.

[0094] Since the cables inside the inner tube 100 are more prone to collisions, the soundproof baffle 500 can be set near the upper end of the second telescopic component 210, so that the length H1 of the first cable 410 in the blocking range of the soundproof baffle 500 is greater than the length H2 of the second cable 420 in the blocking range of the soundproof baffle 500, thereby increasing the protection of the first cable 410.

[0095] The sound insulation baffle can also be configured to extend and retract with the extension and retraction of the transmission assembly. The extendable sound insulation baffle can extend after the transmission assembly extends, thereby increasing its blocking effect on the spiral cable and avoiding weakening its blocking effect on the spiral cable due to the extension of the spiral cable.

[0096] Reference Figure 12Unlike the above embodiments, in another embodiment of the present invention, a wiring cavity 401 for arranging the spiral cable 400 is formed between the outer periphery of the transmission assembly and the sleeve assembly. The transmission assembly is located within the accommodating space 402 of the spiral cable 400, so that the spiral cable 400 is wound around the transmission assembly. The transmission assembly can radially position the spiral cable 400, thereby reducing the swaying amplitude of the spiral cable 400. At the same time, setting the spiral cable 400 on the outer periphery of the transmission assembly can reduce the space required for the spiral cable 400 arrangement, thereby reducing the volume of the lifting column.

[0097] Reference Figure 3 , Figures 5 to 8 Based on the above embodiments, in one embodiment of the present invention, to prevent the spiral cable 400 from separating from the first fixing part 300 and the third fixing part 320 during the extension and retraction process, the first fixing part 300 includes a first wire clip 302, and the third fixing part 320 includes a second wire clip 331. The first wire clip 302 and the second wire clip 331 have the same basic structure. For ease of explanation, this embodiment will describe the structure of the second wire clip 331. The second wire clip 331 has an opening 330 so that one end of the spiral cable 400 can be inserted into the second wire clip 331 through the opening 330, and the other end of the spiral cable 400 can also be inserted into the first wire clip 302. This fixes both ends of the spiral cable 400 and allows it to move with the movement of the first fixing part 300 and the third fixing part 320, thereby enabling the spiral cable 400 to extend and retract to maintain power transmission.

[0098] The spiral cable 400 is provided with a positioning protrusion 430 protruding in the radial direction of the spiral cable 400. The second wire clip 331 is provided with a positioning slot 332 corresponding to the positioning protrusion 430. When the spiral cable 400 is inserted into the second wire clip 331, the positioning protrusion 430 cooperates with the positioning slot 332 to position the spiral cable 400 in the extension and retraction direction of the transmission assembly. In the extension and retraction direction of the transmission assembly, the inner walls on both sides of the positioning slot 332 have a stopping effect on the positioning protrusion 430, and can maintain the cooperation state between the two in the extension and retraction direction of the transmission assembly. The two ends of the spiral cable 400 will not move relative to the first wire fixing part 300 and the third wire fixing part 320 respectively during the extension and retraction process, so as to maintain the current supply to the electrical equipment.

[0099] Positioning protrusions can also be set on the cable card, and positioning slots can be set on the spiral cable.

[0100] The second wire clip 331 is provided with a positioning hole 333 that connects to the opening 330. The spiral cable 400 moves radially through the opening 330 to be inserted into the positioning hole 333, which minimizes damage to the spiral cable 400 and facilitates the separation of the spiral cable 400 from the second wire clip 331. The inner wall of the opening 330 is provided with a stop protrusion 334 for radially stopping the spiral cable 400. The stop protrusion 334 can stop the spiral cable 400 radially to keep the spiral cable 400 in the positioning hole 333, so that the spiral cable 400 will not move radially with the extension and retraction of the transmission assembly and separate from the second wire clip 331.

[0101] The first wire fixing part 300 is connected to the drive device 230, the second wire fixing part 310 is connected to the outer tube, and the third wire fixing part 320 is connected to the end of the outer tube 110.

[0102] Reference Figure 3 , Figures 5 to 9 Based on the above embodiments, in one embodiment of the present invention, the lower end of the sleeve assembly is further provided with a first power interface 600. One end of the spiral cable 400 is electrically connected to the first power interface 600, and the other end of the spiral cable 400 is electrically connected to the driver. The lifting column also includes a junction box 610. The first power interface 600 and the spiral cable 400 are electrically connected on the junction box 610. The junction box 610 can hide the part where the spiral cable 400 is electrically connected to the first power interface 600, so that the terminals of the two can be isolated from the transmission assembly and the sleeve assembly. The terminals of the spiral cable 400 and the terminals of the first power interface 600 will not come into contact with the transmission assembly or the sleeve assembly, avoiding the current from being transmitted to the transmission assembly or the sleeve assembly and causing leakage or sparks, thus reducing the safety hazards of the lifting column.

[0103] The position of the first power interface 600 will not change relative to the ground as the bushing assembly expands or contracts, thus preventing any change in the position of the power line connected to the power grid.

[0104] Junction box 610 includes a box body 620 and a wiring cavity 630 formed by the box body 620. The part of the spiral cable 400 that is electrically connected to the first power interface 600 is hidden in the wiring cavity 630. The spiral cable 400 and the first power interface 600 are electrically connected within the wiring cavity 630. The wiring cavity 630 hides the part of the electrical connection between the two inside, which can avoid contact with the transmission assembly or the sleeve assembly. Even if the position of the part of the electrical connection between the spiral cable 400 and the first power interface 600 changes during the extension and retraction of the sleeve assembly, it will only move within the wiring cavity 630 and will not accidentally touch the transmission assembly or the sleeve assembly.

[0105] Reference Figure 4Based on the above embodiments, in one embodiment of the present invention, the drive device 230 is further provided with a second power interface 601. The second power interface 601 can be electrically connected to the controller of the electric table, or connected to an external circuit, or electrically connected to another lifting column.

[0106] Reference Figures 7 to 9 Based on the above embodiments, in one embodiment of the present invention, the second wire clip 331 on the outer tube 110 is mounted on the junction box 610. The box body 620 is provided with a first mounting hole 640 for mounting the second wire clip 331, and the first mounting hole 640 communicates with the wiring cavity 630. After the spiral cable 400 is engaged with the second wire clip 331, it can extend into the wiring cavity 630 through the first mounting hole 640, which facilitates the connection between the spiral cable 400 and the junction box 610. The wire clip can also be integrally formed on the box body.

[0107] The housing 620 also has a second mounting hole 650 for mounting the first power interface 600. The second mounting hole 650 connects to the wiring cavity 630. The side of the first power interface 600 that extends into the wiring cavity 630 has a terminal 660 for electrically connecting the spiral cable 400. The other side of the first power interface 600 has a socket hole 670. The first power interface 600 is installed at the second mounting hole 650 so that the terminal 660 can extend into the wiring cavity 630 through the second mounting hole 650. The first power interface 600 is installed on the junction box 610 and can be fixed to the junction box 610 so that the terminal 660 can be kept in the wiring cavity 630, preventing the part of the spiral cable 400 that is electrically connected to the terminal 660 from contacting the transmission assembly or the sleeve assembly.

[0108] Reference Figure 3 , Figure 5 and Figure 6 Based on the above embodiments, in one embodiment of the present invention, the junction box 610 further includes a prepositioning component 680, which is fitted on the transmission assembly for circumferential positioning of the junction box 610. The prepositioning component 680 is a square tube, which can rotate and limit the junction box 610 after cooperating with the transmission assembly, so as to avoid the junction box 610 from deviating from its position and affecting the assembly of the lifting column.

[0109] The bottom of the outer tube 110 is open, and the junction box 610 is located at the bottom of the outer tube 110. The lifting column also includes a fixing plate 130, which is fixedly connected to the junction box 610, the transmission assembly, and the sleeve assembly. The fixing plate 130 can connect the transmission assembly and the sleeve assembly so that part of the structure of the transmission assembly is connected to part of the structure of the sleeve assembly, so that the transmission assembly can drive the sleeve assembly to extend and retract. The fixing plate 130 also installs the junction box 610 onto the sleeve assembly, which can reduce the number of parts required to assemble the junction box 610 and reduce the assembly steps. Under the action of the pre-positioning component 680, the junction box 610 can be pre-held in the installation position and will not change position during the installation of the fixing plate 130.

[0110] During the installation of the mounting plate 130, multiple screws pass through the mounting plate 130 and are fixedly connected to the junction box 610, the transmission assembly, and the outer tube 110, respectively. The pre-positioning member 680 aligns the screw holes on the junction box 610 with the screw holes on the mounting plate 130.

[0111] Reference Figure 3 and Figure 10 Based on the above embodiments, in one embodiment of the present invention, the second telescopic component 210 is an outer sleeve with a first transmission nut 250, the first telescopic component 200 is a first lead screw, the third telescopic component 220 is an inner sleeve with a second transmission nut 260, and the transmission assembly further includes a second lead screw 240 fitted outside the first lead screw. The first lead screw can drive the second lead screw to rotate synchronously and can telescopically extend and retract axially relative to the second lead screw 240. The inner sleeve is disposed inside the outer sleeve, and the second lead screw 240 and the first lead screw are disposed inside the inner sleeve. The first lead screw is threadedly engaged with the first transmission nut 250, and the second lead screw 240 is threadedly engaged with the second transmission nut 260.

[0112] The first lead screw extends and retracts relative to the outer sleeve and the second lead screw 240 during rotation by threaded engagement with the first transmission nut 250. During this process, the second lead screw 240 is driven to rotate by the first lead screw. The second lead screw drives the inner sleeve to extend and retract relative to the outer sleeve by threaded engagement with the second transmission nut 260.

[0113] The drive device 230 is used to drive the first lead screw to rotate. The first lead screw extends and retracts relative to the outer sleeve and the second lead screw 240 during rotation by threaded engagement with the first transmission nut 250. The second lead screw 240 is driven to rotate by the first lead screw during this process. The second lead screw drives the inner sleeve to extend and retract relative to the outer sleeve by threaded engagement with the second transmission nut 260.

[0114] The present invention also discloses an electric table, including a tabletop, a controller on the tabletop, and two lifting columns at the bottom of the tabletop, one of which is the lifting column disclosed in any of the above embodiments. A spiral cable is electrically connected to the controller, and the controller is electrically connected to the drive device in each of the two lifting columns.

[0115] Electrical equipment can be placed on the table. Since the spiral cable is hidden inside the lifting column, there will be no external spiral cable tangling with the power cord of the electrical equipment on the table, which would cause the power cord and external spiral cable to be pulled during the lifting process of the table.

[0116] Thanks to the junction box, the lifting column will not leak electricity, thus preventing electric shock to users. The spiral cable will also not experience insufficient voltage supply to the driver due to leakage, which would affect the lifting of the tabletop.

[0117] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A lifting column, comprising a sleeve assembly, a transmission assembly for driving the sleeve assembly to extend and retract, and a spiral cable axially penetrating within the sleeve assembly, characterized in that, The lifting column further includes a first fixing part, a second fixing part, and a third fixing part connected sequentially along the spiral cable axially. The first fixing part and the second fixing part generate axial relative displacement with the extension and retraction movement of the transmission assembly to stretch or contract the spiral cable between them. The second fixing part and the third fixing part generate axial relative displacement with the extension and retraction movement of the transmission assembly to stretch or contract the spiral cable between them. A sound insulation baffle is provided on the side of the spiral cable. The sleeve assembly includes an inner tube, a middle tube, and an outer tube from the inside to the outside. In the extended state, the cross-sectional area of ​​the sleeve assembly increases progressively along the setting direction of the first fixing part, the second fixing part, and the third fixing part. The length of the spiral cable between the first fixing part and the second fixing part within the blocking range of the sound insulation baffle is H1, and the length of the spiral cable between the second fixing part and the third fixing part within the blocking range of the sound insulation baffle is H2. H1 is greater than H2.

2. The lifting column according to claim 1, characterized in that, The transmission assembly includes a first telescopic component, a second telescopic component, and a third telescopic component that can extend and retract relative to each other. The first and second fixed wire portions generate axial relative displacement as the first and second telescopic components extend and retract relative to each other. The second and third fixed wire portions also generate axial relative displacement as the second and third telescopic components extend and retract relative to each other.

3. The lifting column according to claim 2, characterized in that, The first telescopic component is a first lead screw, the second telescopic component is an outer sleeve with a first transmission nut, and the third telescopic component is an inner sleeve with a second transmission nut. The outer sleeve is fitted over the inner sleeve. The transmission assembly also includes a second lead screw fitted over the first lead screw. The first lead screw can drive the second lead screw to rotate synchronously and can telescopically extend and retract relative to the second lead screw axially. The first lead screw is threadedly engaged with the first transmission nut, and the second lead screw is threadedly engaged with the second transmission nut.

4. The lifting column according to claim 3, characterized in that, The lifting column also includes a drive device for driving the first lead screw to rotate, the first wire fixing part is mounted on the drive device, the second wire fixing part is mounted on the outer sleeve, and the third wire fixing part is mounted on the sleeve assembly.

5. The lifting column according to claim 1, characterized in that, The second fixing part is installed on the sound insulation baffle.

6. The lifting column according to claim 1, characterized in that, The sound insulation baffle can extend and retract with the extension and retraction of the transmission assembly.

7. The lifting column according to claim 1, characterized in that, The spiral cable is arranged side by side with the transmission assembly, and the first wire fixing part and / or the second wire fixing part includes a guide post extending into the sleeve assembly, and at least a portion of the spiral cable is wound around the guide post.

8. The lifting column according to claim 1, characterized in that, The spiral cable forms an accommodating space for the transmission assembly.

9. The lifting column according to any one of claims 1 to 8, characterized in that, When the transmission assembly performs telescopic movement, it transmits force to the spiral cable through the second fixed part.

10. The lifting column according to claim 9, characterized in that, The second wire fixing part is fixedly connected to the spiral cable; or, the second wire fixing part is axially positioned on the spiral cable.

11. The lifting column according to any one of claims 1 to 8, characterized in that, The sleeve assembly includes an inner tube, a middle tube, and an outer tube from the inside out. When the sleeve assembly is extended, its cross-sectional area increases progressively along the setting direction of the first fixed part, the second fixed part, and the third fixed part. The length of the spiral cable between the first fixed part and the second fixed part is less than the length of the spiral cable between the second fixed part and the third fixed part.

12. The lifting column according to any one of claims 1 to 8, characterized in that, The first and third fixing parts are connected by an integral spiral cable.

13. The lifting column according to any one of claims 1 to 8, characterized in that, The spiral cable includes a first cable and a second cable separately disposed from the first cable. The first cable is connected between the first fixing part and the second fixing part, and the second cable is connected between the second fixing part and the third fixing part. The first cable and the second cable are electrically connected.

14. The lifting column according to claim 13, characterized in that, The second wire-fixing part includes clamping parts for clamping the first cable and the second cable respectively, the first cable and the second cable being connected to establish an electrical connection between them; or, the second wire-fixing part includes a conductive module, the first cable and the second cable being connected to the conductive module respectively to establish an electrical connection between them.

15. The lifting column according to any one of claims 1 to 8, characterized in that, The first wire fixing part includes a first wire clip, and the third wire fixing part includes a second wire clip. The first wire clip and the second wire clip respectively axially position the two ends of the spiral cable.

16. An electric height-adjustable desk, characterized in that: It includes a tabletop and a lifting column as described in any one of claims 1 to 15, wherein a controller is provided on the tabletop and the spiral cable is electrically connected to the controller.

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