Internal wiring lifting stand column of electric lifting table

Abstract

The utility model discloses an internal wiring lifting stand column of an electric lifting table. The internal wiring lifting stand column comprises a fixed supporting pipe of a linear driving mechanism and a fixed pipe of a telescopic pipe. The motor assembly located at the top end of the lifting stand column is connected with the power socket at the bottom end of the lifting stand column through a telescopic power line. The lower end of a fixed pipe of the telescopic pipe is provided with a through hole used for transversely embedding the power socket. An insulating shell of the power socket is fixed with the through hole; a power line head protection sleeve capable of determining the height position during installation is arranged in the lower end of a fixed pipe of the telescopic pipe, and the outer ends of a plurality of conductive terminals of the power socket are contained in the power line head protection sleeve. The bottom end of a fixed supporting pipe of the linear driving mechanism is detachably fixed to the bottom plate. The power line head protection sleeve sleeves the lower end of the fixed supporting tube through an integrally-formed fixing sleeve. The height of the power socket can be pre-determined according to the depth of the bottom end of the lifting column inserted into the foot plate hole before leaving a factory, so that the power plug and the power socket can be conveniently, flexibly and reliably plugged.

Description

Technical Field

[0001] The utility model relates to the technical field of lift tables, in particular to an inner-wire lift column of an electric lift table. Background Art

[0002] The lifting columns of conventional electric lift tables include multiple, telescopic tubes, such as three or two tubes. The outer tube of the three tubes can be a fixed tube with a base plate fixed at its bottom, or the inner tube can be a fixed tube with a base plate fixed at its bottom. The lifting columns of conventional electric lift tables also include support tubes connected to a linear drive mechanism, such as the inner and outer support tubes in a three-telescopic tube configuration, where the outer support tube can slide up and down relative to the inner support tube, which is a fixed support tube; or the only support tube in a two-telescopic tube configuration, where the fixed support tube is the only support tube.

[0003] The power cord of the lifting column of early electric lifting tables generally extended from the motor assembly at the top of the lifting column. The wire from the top of the lifting column to the ground was an exposed wire, which was easily entangled and knotted when the column was raised and lowered, posing a safety hazard such as power outage and leakage.

[0004] In recent years, some engineers have designed lifting columns with internal wiring, such as the applicant's prior patent application, ZL202322570188.0, entitled "Lifting Column with Internal Wiring and Electric Lift Table." This design provides a lifting column with internal wiring. A retractable power cord connects the motor assembly at the top of the column to the power socket at the bottom. This effectively prevents the power cord from becoming tangled when the column is raised or lowered, preventing cable jams, power outages, and leakage.

[0005] However, in practical application, the above-mentioned prior art lifting columns with internal wiring still have the following shortcomings: 1. The power socket is fixed to the bottom plate of the lifting column, while the bottom end of the fixed support tube of the linear drive mechanism can only be fixed to the bottom plate welded to the fixed tube of the telescopic tube, such as the external fixed tube or the inner fixed tube, through the power socket. Since the power socket and the bottom plate are fixed, and the height position of the bottom plate is also fixed, in actual application, due to the large difference in thickness of the footboards of the electric lift table, the depth of the bottom end of the column inserted into the footboard hole often also varies greatly. If the depth of the bottom end of the column inserted into the footboard hole is too deep, the inner surface of the bottom plate of the power socket will be too close to the top surface of the footboard of the electric lift table, making it inconvenient to plug the power plug into the power socket, and even preventing the power plug from being inserted into the power socket. 2. The fixing structure of the fixed support tube, power socket and bottom plate of the linear drive mechanism is relatively complex and relatively inconvenient to install. 3. Because the multiple power cord ends at the lower end of the power cord are directly fixed to the outer ends of multiple, such as three, conductive terminals of the power socket, the pulling of the power cord during the lifting process of the lifting column will directly affect the connection between the power cord ends and the outer ends of the conductive terminals, posing a safety hazard of loosening of the connection. The above shortcomings need to be improved. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide an internal wiring lifting column for an electric lifting table, in which the height of the power socket can be predetermined according to the depth of the bottom end of the column inserted into the foot plate hole before leaving the factory, so as to ensure that the power plug and the power socket are conveniently, flexibly and reliably connected.

[0007] The technical solution of the present utility model is to provide an internal wiring lifting column for an electric lifting table, including a fixed tube of a telescopic tube; a motor assembly located at the top of the lifting column and a power socket at the bottom of the lifting column are connected via a retractable power cord, a through hole is provided at the lower end of the fixed tube of the telescopic tube for transversely embedding the power socket; an insulating shell of the power socket is fixed to the through hole; a power cord head protective cover is provided at the lower end of the fixed tube of the telescopic tube for determining the height position during installation, and the outer ends of multiple conductive terminals of the power socket are accommodated in the power cord head protective cover.

[0008] With the above structure, the internal cable routing lifting column of the electric lift table of this invention offers the following advantages: the height of the power cord protection cover can be determined during installation. Because the outer ends of the multiple conductive terminals of the power socket are accommodated within the protection cover, the height of the through-hole matches the determined height of the protection cover during installation. In other words, the height of the power socket can be pre-determined before shipment based on the depth of the column's bottom end inserted into the footboard hole, ensuring convenient, flexible, reliable, smooth, and stable insertion and removal of the power plug from the power socket. Furthermore, the system is compatible with footboards of various thicknesses for electric lift tables.

[0009] Furthermore, the internal wiring lifting column of the electric lifting table of the present invention also includes a fixed support tube for the linear drive mechanism, the bottom end of the fixed support tube of the linear drive mechanism being detachably fixed to the base plate; the power cord head protective cover is fitted onto the lower end of the inner support tube via an integrally formed fixed sleeve, and the fixed sleeve is fixed to a predetermined height at the lower end of the inner support tube via a first fixing structure. With the above structure, an embodiment of a fixed sleeve is provided in which the height position of the power cord head protective cover is adjustable before shipment. During factory installation, the height of the fixed sleeve on the fixed support tube is adjustable, and the height of the through hole is also pre-set to coincide with the installation height position of the power cord head protective cover. The fixed sleeve can be inserted from the bottom end of the fixed support tube and moved upward to a predetermined height position, and then fixed via the first fixing structure, further ensuring the technical effect of the power cord head protective cover being adjustable in height within the lower end of the fixed tube before shipment. In addition, the fixing structure between the fixed support tube of the linear drive mechanism and the power cord head protective cover is relatively simple, installation is relatively convenient, and the installation height position is accurate.

[0010] Furthermore, the linear drive mechanism's fixed support tube is a rectangular tube, the fixed sleeve is a rectangular sleeve, and the first fixing structure comprises a first screw and a matching first screw hole and first threaded hole. This structure prevents the sliding sleeve from rotating circumferentially, and the fixing structure is simple, making it both easy to install and stable and reliable.

[0011] Furthermore, the power cord protective cover has a second fixing structure for fixing the lower end of the vertical power cord cable. Below the second fixing structure are multiple power cord ends extending from the lower end of the cable and used to fix to the outer ends of multiple conductive terminals. With the above structure, the lower end of the cable is fixed, and a section is reserved outside the through hole of the fixing tube during installation to fix multiple, for example, three, power cord ends to the outer ends of the conductive terminals of the power socket. This not only makes installation more convenient, but also ensures that any pulling of the power cord during the raising and lowering of the lifting column directly affects the fixing structure at the lower end of the power cord cable, preventing or even avoiding the safety hazards that may arise from the connection between the power cord ends and the outer ends of the conductive terminals being easily loosened.

[0012] Furthermore, the fixing tube of the telescopic tube can be an external fixing tube or an internal fixing tube; the second fixing structure is a clamp that clamps the lower end of the vertical power cable, and the clamp is screwed to the power cable head protective cover via a second screw. With this structure, the specific structure of the fixing structure at the lower end of the power cable is simple, strong, and reliable.

[0013] Furthermore, the power cord protector is fixed to a predetermined height on the wall of the lower end of the fixed tube via a third fixing structure. This structure provides an embodiment in which the power cord protector is factory-adjustable in height, wherein the power cord protector is mounted on the lower end of the fixed tube wall. Similarly, the height of the through-hole is pre-set to coincide with the installation height of the power cord protector, further ensuring the technical effect of factory-adjustable height of the power cord protector within the lower end of the fixed tube.

[0014] Furthermore, a vertical connecting plate is fixed to the outer tube wall on the other side, symmetrical to the through-holes of the fixed tube. The vertical connecting plate has multiple vertical elongated through-holes, and the tube wall on the other side also has multiple corresponding vertical elongated through-holes. The end of the power cord cover away from the power socket has multiple transverse second threaded holes, and multiple third screws pass through the corresponding vertical elongated through-holes and are tightened in the corresponding second threaded holes. With the above structure, the fixing structure between the power cord cover and the fixed tube wall is relatively simple, installation is relatively convenient, and the installation height and position are accurate.

[0015] Furthermore, the lower end of the cable passes through a cable through-hole on the wall of the power cord head protective sleeve and is fixed by interference fit or / and adhesive bonding. The lower end of the cable has multiple power cord heads for fixing to the outer ends of multiple conductive terminals. After adopting the above structure, in another structure with adjustable height before leaving the factory, another embodiment of the fixing structure of the lower end of the power cable is provided. The lower end of the cable is fixed, and a section is reserved for pulling out the outside of the through-hole of the fixing tube during installation to fix multiple power cord heads, such as three power cord heads, to the outer ends of the conductive terminals of the power socket. This is more convenient for installation and ensures that the pulling of the power cord during the lifting process of the lifting column directly acts on the fixing structure of the lower end of the power cable, preventing or even avoiding the safety hazards that may be caused by the loosening of the connection between the power cord head and the outer end of the conductive terminal.

[0016] Furthermore, the multiple tubes of the telescopic tube are all rectangular tubes, the insulating housing of the power socket is rectangular, the power cord protective cover is a rectangular tube, and the through hole is a rectangular through hole. The insulating housing of the power socket is secured to the rectangular through hole wall via elastic clips on the upper and lower sides or the left and right sides. With this structure, the various components are prevented from rotating relative to each other, facilitating installation while ensuring a stable and reliable connection.

[0017] Furthermore, a gap is defined between the outer walls of the power socket's insulating housing and the inner walls of the power cord protection sleeve; the rear end of the power socket's insulating housing is located within the power cord protection sleeve. This structure facilitates installation and ensures that the installed power cord is contained within the first cord protection sleeve, further ensuring the reliability and stability of the electric lift table's linear drive mechanism and power cord within the telescopic tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the first embodiment of the internal wiring lifting column of the utility model.

[0019] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of A in the figure.

[0020] Figure 3 It is a structural schematic diagram of the second embodiment of the internal wiring lifting column of the utility model.

[0021] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of B.

[0022] Figure 5 yes Figure 1 Schematic diagram of the structure of the external fixing tube exploded in the first embodiment.

[0023] Figure 6 yes Figure 3 Schematic diagram of the structure of the telescopic tube exploded in the second embodiment (the fixed tube is inside).

[0024] Figure 7 yes Figure 1 Schematic diagram of the structure after the external fixing tube is exploded in the first embodiment.

[0025] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of C in the middle.

[0026] Figure 9 yes Figure 5 Schematic diagram of the structure of the first embodiment after the external fixation tube is rotated 180 degrees.

[0027] Figure 10 yes Figure 6 Schematic diagram of the structure of the telescopic tube of the second embodiment after rotating 180°.

[0028] Figure 11 yes Figure 7 Schematic diagram of the structure of the first embodiment after rotating 180°.

[0029] Figure 12 yes Figure 11 Schematic diagram of the enlarged structure of D in the middle.

[0030] Figure 13 This is a schematic diagram of the explosion structure of the third embodiment of the internal wiring lifting column of the utility model after the external fixed tube is exploded.

[0031] Figure 14 yes Figure 13 Schematic diagram of the enlarged structure of D in the middle.

[0032] As shown in the figure:

[0033] 1. Lifting column, 11. External fixing tube, 111. First through hole, 12. Internal support tube, 121. Bottom end plate, 13. Bottom plate, 131. Screw hole, 14. Internal fixing tube, 141. Second through hole, 15. Fourth screw;

[0034] 2. Motor assembly;

[0035] 3. Power socket assembly, 31. Power socket, 311. Insulating housing, 3111. Insulating end plate, 3112. Elastic buckle, 3113. Rectangular limiting frame, 312. Outer end of conductive terminal, 313. Inner end of conductive terminal, 32. First power cord protective cover, 33. Fixing sleeve, 34. Second screw, 35. Clamp, 36. First screw, 37. Second power cord protective cover, 371. Second threaded hole, 38. Vertical connecting plate, 381. Vertical elongated through hole, 39. Third screw;

[0036] 4. Power cord, 41. Lower end of cable, 411. Power cord end. DETAILED DESCRIPTION

[0037] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these specific embodiments are intended to facilitate understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various specific embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0038] like Figures 1-14 shown.

[0039] The lifting column 1 of the electric lift table of the present invention includes a fixed support tube connected to a linear drive mechanism, such as an inner support tube 12 within a three-telescopic tube structure. The lifting column 1 also includes multiple telescopic tubes, such as an outer fixed tube 11, one of the three telescopic tubes, that are telescoped relative to each other. The outer fixed tube 11 is positioned outside the supporting tube, such as an outer supporting tube within the outer supporting tube, and a base plate 13 can be fixed to the bottom end of the outer fixed tube 11. A motor assembly 2 at the top of the lifting column 1 is connected to a power socket 31 at the bottom end of the lifting column 1 via a retractable power cord 4, such as one that can be retracted via multiple pulleys. The lower end of the outer fixed tube 11 of the lifting column 1 has a through hole, such as a first through hole 111, for transversely engaging the power socket 31. This structure is similar to that described in the applicant's prior patent application, patent number ZL202322570188.0, entitled "A Lifting Column with Internally Routed Cables and Electric Lift Table." The inner support tube 12 is referred to as the second support tube in this patent, and the outer fixed tube 11 is referred to as the outer tube.

[0040] In the prior art, the inner tube of the three telescopic tubes can also be a fixed tube, referred to as inner fixed tube 14, with base plate 13 fixed to its bottom end. The lower end of inner fixed tube 14 of lifting column 1 has a through hole, such as second through hole 141, for transversely inserting power socket 31. In the prior art, only one support tube, namely the fixed support tube, is included in the two-telescopic tube structure.

[0041] It is readily understood that the power cord can be retracted within the lifting column. Alternatively, other prior art structures may be employed, such as a power cord having a spiral cable with multiple turns, whereby the cable extends as the telescopic tube extends and contracts as the tube contracts, allowing the cable to extend and retract as the tube expands and contracts. The above is prior art.

[0042] The invention points of the present utility model are as follows.

[0043] The insulating housing 311 of the power socket 31 is fixed to a through hole, such as the first through hole 111 or the second through hole 141. A power cord protection cover 32 is located within the lower end of the fixed tube of the telescopic tube, such as the outer fixing tube 11 or the inner fixing tube 14. This cover allows for a height adjustment during installation, i.e., before shipment. Multiple conductive terminal outer ends 312 of the power socket 31 are housed within the power cord protection cover 32.

[0044] Figure 1 、 Figure 2 、 Figure 5 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 11 、 Figure 12 Shown is the first embodiment of the present utility model.

[0045] The bottom end of the fixed support tube of the linear drive mechanism, such as the inner support tube 12, is detachably fixed to the bottom plate 13. A power cord protective cover, such as the first power cord protective cover 32, is fitted onto the bottom end of the fixed support tube, such as the inner support tube 12, via an integrally formed fixing cover 33. The fixing cover 33 is secured to the bottom end of the fixed support tube, such as the inner support tube 12, at a predetermined height via a first fixing structure.

[0046] The fixed support tube of the linear drive mechanism, such as the inner support tube 12, is preferably a rectangular tube, the fixed sleeve 33 is preferably a rectangular sleeve, and the first fixing structure is preferably a first screw 36 and a matching first screw hole and a first threaded hole, such as two symmetrically arranged first screws 36, each first screw 36 passes through the corresponding screw hole on the fixed sleeve 33, and is symmetrically tightened in the respective threaded holes of the fixed support tube, such as the inner support tube 12.

[0047] The power cord protective cover, such as the first power cord protective cover 32, has a second fixing structure for fixing the lower end 41 of the vertical power cord 4. Below the second fixing structure, there are multiple power cord ends 411 extending from the lower end 41 of the cable and used to be fixed to multiple, such as three, conductive terminal outer ends 312.

[0048] The fixed tube of the telescopic tube is preferably an outer fixed tube 11 .

[0049] The multiple tubes of the telescopic tube, such as the outer fixed tube 11, the middle tube (i.e., the middle lift tube), and the inner tube (i.e., the inner lift tube), can all be rectangular tubes. The insulating housing 311 of the power socket 31 can be rectangular. Power cord protection covers, such as the first power cord protection cover 32 and the second power cord protection cover 37 described below, can both be rectangular tubes. Through holes, such as the first through hole 111 and the second through hole 141 described below, can both be rectangular through holes. The insulating housing 311 of the power socket 31 is secured to the rectangular through hole walls via elastic clips 3112 on its upper and lower sides. It is readily understood that the outer end of the insulating housing 311 of the power socket 31 has a limiting edge, such as a rectangular limiting frame 3113.

[0050] There are gaps between the outer four walls of the insulating shell 311 of the power socket 31 and the four inner walls of the power cord head protection cover, such as the first power cord head protection cover 32 and the second power cord head protection cover 37 described below; the tail end of the insulating shell 311 of the power socket 31 is located in the power cord head protection cover, such as the first power cord head protection cover 32 or the second power cord head protection cover 37 described below.

[0051] The second fixing structure is preferably a clamp 35 that clamps the lower end 41 of the vertical power cord 4. The clamp 35 is screwed and fixed to the power cord head protective cover such as the first power cord head protective cover 32, such as the side wall of the top of the first power cord head protective cover 32, through a second screw 34. Specifically, two second screws 34 can pass through the corresponding two screw holes on the clamp 35 and be tightened in the corresponding threaded holes on the side walls of the top of the first power cord head protective cover 32.

[0052] Three conductive terminals are fixed to the insulating end plate 3111 of the insulating housing 311. The outer ends 312 of the conductive terminals are located outside the insulating end plate 3111, and the inner ends 313 of the conductive terminals are located inside the power socket 31 on the inner side of the insulating end plate 3111. As will be appreciated, the inner ends 313 of the conductive terminals are used to electrically connect to the power plug. Conductive terminals are also called wiring terminals. Each outer end 312 of the conductive terminals is fixed to each power cord 411 by soldering or by using male and female clips made of conductive material. The inner ends 313 of the conductive terminals are also called male connectors, and the outer ends 312 of the conductive terminals are also called female connectors.

[0053] The bottom end plate 121 of the fixed support tube, such as the inner support tube 12, and the bottom plate 13 welded to the bottom end of the outer fixed tube 11 can be fixed by a plurality of fourth screws 15. For example, four fourth screws 15 pass through corresponding screw holes 131 on the bottom plate 13 and are tightened into corresponding threaded holes on the fixed support tube, such as the bottom end plate 121 of the inner support tube 12.

[0054] The insulating housing 311 of the power socket 31, the first power cord protective cover 32 and the integrally formed fixing cover 33 can all be made of bakelite or hard plastic. The second power cord protective cover 37 described below can also be made of bakelite or hard plastic.

[0055] For ease of description, the components marked with the first number 3 above can all be classified as power socket component 3.

[0056] During installation, the fixing sleeve 33 can be first inserted into the fixing support tube such as the lower end of the inner support tube 12 from the bottom end of the inner support tube 12 and fixed at a predetermined height by the first screw 36, and then the lower end 41 of the power cord 4 is fixed with the clamp 35 and the second screw 34, and a reserved length section of the power cord head 411 for fixing the outer end 312 of the conductive terminal of the power socket 31 outside the outer fixing tube 11 is reserved (the reserved length section of the power cord head 411 is not shown in the figure), and the reserved length section is accommodated in the first power cord head protective sleeve 32, and then inserted from the bottom end into the outer fixing tube 11 with the welded bottom plate 13 and the first through hole 111 reserved. Then, multiple power cords 411, such as three, are pulled out from the first power cord protective sleeve 32 and secured to the outer ends 312 of the conductive terminals of the power socket 31. The remaining length is then retained within the first power cord protective sleeve 32. The insulating housing 311 of the power socket 31 is inserted into the first through-hole 111 and pressed into place so that the rear end of the insulating housing 311 of the power socket 31 is inserted into the hole of the first power cord protective sleeve 32, blocking the remaining length of the power cord 411. The insulating housing 311 is then secured to the wall of the first through-hole 111 of the outer fixing tube 11 via the upper and lower elastic clips 3112 of the insulating housing 311 of the power socket 31. Four fourth screws 15 are then passed through the corresponding screw holes 131 on the bottom plate 13 and tightened into the corresponding threaded holes on the fixed support tube, such as the bottom end plate 121 of the inner support tube 12.

[0057] Figure 3 、 Figure 4 、 Figure 6 、 Figure 10 The second embodiment of the present invention is shown in the figures. The figures in this section show the appearance and can be seen in Figure 7 、 Figure 8 、 Figure 11 、 Figure 12 The fixed tube of the telescopic tube can be an inner fixed tube 14. The inner fixed tube 14 is preferably a rectangular tube. This is the second embodiment. It is not difficult to understand that Figure 7 、 Figure 8 、 Figure 11 and Figure 12 The structure shown is after the outer fixing tube 11 of the telescopic tube is removed, while the structure shown in this embodiment is after the outer tube, middle tube and inner fixing tube 14 of the telescopic tube are all removed. Figure 7 、 Figure 8 、 Figure 11 and Figure 12 The lower end structure shown in FIG is identical to that of the present embodiment. Specifically, the inventive concept of this embodiment is essentially the same as that of the first embodiment described above, except that the first embodiment utilizes an external fixing tube 11 while this embodiment utilizes an internal fixing tube 14. The installation process of this embodiment is also identical to that of the first embodiment, except that the assembled internal fixing tube 14, middle tube, and outer tube of the telescopic tube are inserted last. Therefore, the internal structure of the second embodiment is not separately illustrated, and its description is omitted.

[0058] Figure 13 and Figure 14 Shown is a third embodiment of the present utility model.

[0059] The power cord head protective cover such as the second power cord head protective cover 37 is fixed to the fixed tube such as the third fixing structure. Figure 13 and Figure 14 The second power line head protective cover 37 can also be fixed on the wall of the inner fixed tube 14 not shown in the figure.

[0060] Taking the external fixing tube 11 as an example, the specific structure may be as follows: a vertical connecting plate 38 is fixed on the outer tube wall on the other side symmetrical to the through hole of the fixing tube, such as the first through hole 111 of the external fixing tube 11, and a plurality of vertical elongated through holes 381, such as two, are provided on the vertical connecting plate 38. The tube wall on the other side also has a corresponding plurality of vertical elongated through holes, such as two (the vertical elongated through holes on the tube wall are not shown). The power cord head protective cover, such as the second power cord head protective cover 37, has a plurality of second horizontal threaded holes 371, such as four, on the end away from the power socket 31. A plurality of third screws 39, such as four, pass through the corresponding vertical elongated through holes 381 and the corresponding elongated through holes on the tube wall and are screwed into the corresponding second threaded holes 371. Figure 13 and Figure 14 As shown, the two upper and lower third screws 39 on the left side pass through the vertical elongated through-hole 381 on the left side and the elongated through-hole on the tube wall, and are screwed into the upper and lower second threaded holes 371 on the left side of the second power cord head protective cover 37; the two upper and lower third screws 39 on the right side pass through the vertical elongated through-hole 381 on the right side and the elongated through-hole on the tube wall, and are screwed into the upper and lower second threaded holes 371 on the right side of the second power cord head protective cover 37.

[0061] The lower end 41 of the cable passes through a cable hole on the wall of the power line head protective cover, such as the second power line head protective cover 37, and is fixed by interference fit or / and bonding. The lower end 41 of the cable has multiple power line heads 411 for fixing to the outer ends 312 of the multiple conductive terminals. Figure 14 A circular cable through hole may be provided on the top plate of the second unit wire end protection cover 37, but the cable through hole is not shown in the figure.

[0062] When installing the third embodiment, the power cord 411 and the lower end 41 of the cable can be passed through the circular cable through-hole on the top plate of the second power cord protective cover 37, and then interference fit and glued together to accommodate the reserved length of the power cord 411 in the second power cord protective cover 37. At this time, the position of the first power cord protective cover 37 is basically stable, and then the welded bottom plate 13 and the outer fixing tube 11 with the first through-hole 111 are inserted from the bottom end, and then the third screw 39 is inserted from the vertical elongated through-hole 381 and screwed into the respective second threaded holes 371, and then pulled out from the second power cord protective cover 37. Multiple, for example, three, power cords 411 are removed and secured to the outer ends 312 of the conductive terminals of the power socket 31. The remaining length of the excess power cords 411 is then retained within the second power cord protective sleeve 37. The insulating housing 311 of the power socket 31 is inserted into the first through-hole 111 and pressed into place so that the rear end of the insulating housing 311 of the power socket 31 is inserted into the hole of the second power cord protective sleeve 37, blocking the remaining length of the power cord 411. The insulating housing 311 of the power socket 31 is then secured to the wall of the first through-hole 111 of the outer fixing tube 11 via the upper and lower elastic clips 3112. Four fourth screws 15 are then inserted through the corresponding screw holes 131 on the bottom plate 13 and tightened into the corresponding threaded holes on the fixing support tube, such as the bottom end plate 121 of the inner support tube 12. Of course, in order to make it easier to screw multiple third screws 39 such as the four third screws 39 of the second power cord protective cover 37, you can not weld the bottom plate 13 first, but put your hand deep into the bottom end of the outer fixing tube 11 to assist in aligning the screws of the second power cord protective cover 37. After the power socket 31 is connected to the power cord 411 and fixed, finally weld the bottom plate 13 and use four fourth screws 15 to screw and fix the support tube such as the bottom end plate 121 of the inner support tube 12 to the bottom plate 13.

[0063] The above embodiments allow for variations, such as a structure for fixing the lower end of the vertical power cable to the power cord end protective sleeve, such as the first power cord end protective sleeve and the second power cord end protective sleeve, or a clamp and the power cord end protective sleeve using male and female buckles. The first screw can be one, three, four, or other numbers. The fixing sleeve can also be a clamp structure that uses multiple screws to clamp to the fixed support tube, or it can be connected using male and female buckles or hooks and rings. All tubes can be round tubes, oval tubes, triangular tubes, etc., but rectangular tubes are preferred. The elastic buckles of the insulating housing of the power socket can also be provided on the left and right sides. The insulating housing of the power socket can also be fixed to the through-hole walls, such as the through-hole walls of the first through-hole and the through-hole walls of the second through-hole, by screw threading, gluing, or interference fit. There is no limit to the depth to which the tail end of the insulating housing of the power socket is inserted into the first power cord end protective sleeve and the second power cord end protective sleeve. The first power cord end protective sleeve and the fixing sleeve can be not integrally formed, but can be two pieces screwed or glued to each other. Alternatively, the vertical connecting plate may be omitted, and the third screw may be threaded through the vertical elongated through-hole in the wall of the fixed tube and screwed into the second threaded hole in the second power cord protective cover. Of course, the vertical connecting plate is preferably provided to provide a more secure structure. The removable connection between the bottom end plate of the fixed support tube, such as the inner support tube, and the bottom plate of the fixed tube, such as the outer or inner fixed tube, may also be achieved by pre-embedded studs secured with nuts, or by multiple claws extending from multiple pre-reserved holes in the bottom plate and then crimped and fastened.

[0064] Parts, structures, quantities, etc. not marked above are not shown in the drawings, and some parts shown in the drawings are not marked in the text. The drawings are for illustration only. If there is any inconsistency between the drawings and the text description or between the drawings, the text description shall prevail.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A lifting column for an electric lift table with internal wiring, comprising a fixed tube within a telescopic tube; a motor assembly at the top of the lifting column is connected to a power socket at the bottom of the lifting column via a retractable power cord; and a through-hole is defined at the lower end of the fixed tube of the telescopic tube for transversely engaging the power socket. The following features are present: The insulating shell of the power socket is fixed to the through hole; the lower end of the fixed tube of the telescopic tube is equipped with a power cord head protective cover that can determine the height position during installation, and the outer ends of multiple conductive terminals of the power socket are accommodated in the power cord head protective cover.

2. The internal wiring lifting column of the electric lifting table according to claim 1 is characterized by: It also includes a fixed support tube for the linear drive mechanism, the bottom end of the fixed support tube for the linear drive mechanism is detachably fixed to the base plate; the power cord protective cover is fitted on the lower end of the fixed support tube through an integrally formed fixed sleeve, and the fixed sleeve is fixed at a predetermined height at the lower end of the fixed support tube through a first fixed structure.

3. The internal wiring lifting column of the electric lifting table according to claim 2 is characterized by: The fixed support tube of the linear drive mechanism is a rectangular tube, the fixed sleeve is a rectangular sleeve, and the first fixing structure is a first screw and a matching first screw through hole and first threaded hole.

4. The internal cable lifting column of the electric lifting table according to claim 1, characterized in that: The power cord protective cover is provided with a second fixing structure for fixing the lower end of the vertical power cable. Below the second fixing structure are multiple power cords extending from the lower end of the cable and used to be fixed to the outer ends of multiple conductive terminals.

5. The internal wiring lifting column of the electric lifting table according to claim 4 is characterized in that: The fixed tube of the telescopic tube is an external fixed tube or an internal fixed tube; the second fixing structure is a clamp for clamping the lower end of the vertical power cable, and the clamp is screwed and fixed to the power cable head protective cover through a second screw.

6. The internal wiring lifting column of the electric lifting table according to claim 1 is characterized by: The power line head protective cover is fixed to a predetermined height of the tube wall at the lower end of the fixed tube via a third fixing structure.

7. The internal cable lifting column of the electric lifting table according to claim 6, characterized in that: A vertical connecting plate is fixed on the outer tube wall on the other side symmetrical to the through hole of the fixed tube, and there are multiple vertical elongated through holes on the vertical connecting plate. There are also multiple corresponding vertical elongated through holes on the tube wall on the other side. The end of the power cord protective cover away from the power socket has multiple horizontal second threaded holes, and multiple third screws pass through the corresponding vertical elongated through holes and are tightened in the corresponding second threaded holes.

8. The internal cable lifting column of the electric lifting table according to claim 6, characterized in that: The lower end of the cable passes through a cable through-hole on the wall of the power line head protection sleeve and is fixed by interference fit or / and bonding. The lower end of the cable has multiple power line heads for fixing with the outer ends of multiple conductive terminals.

9. The internal cable lifting column of the electric lifting table according to claim 1, characterized in that: The multiple tubes of the telescopic tube are all rectangular tubes, the insulating shell of the power socket is rectangular, the power cord protective cover is a rectangular tube, the through hole is a rectangular through hole, and the insulating shell of the power socket is fixed to the rectangular through hole wall by elastic buckles on the upper and lower sides or the left and right sides.

10. The internal wiring lifting column of the electric lifting table according to claim 1, characterized in that: There are gaps between the outer four walls of the insulating shell of the power socket and the four inner walls of the power cord head protection cover; the tail end of the insulating shell of the power socket is located in the power cord head protection cover.

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