HEIGHT-ADJUSTABLE WORKING TABLE

Abstract

A lifting column for a height-adjustable work table comprises a first hollow profile element and a second hollow profile element. The first hollow profile element encloses the second hollow profile element at least in sections. The second hollow profile element is telescopically displaceable in a displacement axis parallel to a vertical axis of the first hollow profile element. A guide device is arranged on the first hollow profile element and comprises a guide element that can be releasably connected to the guide device. A guide element surface of the at least one guide element abuts an outer surface of the second hollow profile element. A height-adjustable work table comprises at least two such lifting columns. A worktop is fixed to one end of the first hollow profile elements. The transmission units are connected to each other via a drive connection element and can be driven by the drive unit.

Claims

1.-20. (canceled)

21. A lifting column (1) for a height-adjustable work table (18), comprising: a first hollow profile element (2); a second hollow profile element (3); and a guide device (5) arranged on the first hollow profile element (2) and having a guide element (6) which can be releasably connected to the guide device (5), wherein the first hollow profile element (2) and the second hollow profile element (3) are arranged such that they can be telescoped relative to one another, wherein the first hollow profile element (2) encloses the second hollow profile element (3) at least in sections, wherein the second hollow profile element (3) is displaceable in a displacement axis parallel to a vertical axis of the first hollow profile element (2), and wherein a guide element surface (7) of the guide element (6) bears against an outer surface (8) of the second hollow profile element (3).

22. The lifting column (1) according to claim 21, wherein the first hollow profile element (2) and the second hollow profile element (3) are rectangular.

23. The lifting column (1) according to claim 21, wherein the guide element (6) is plate-shaped and has a rectangular cross-section.

24. The lifting column (1) according to claim 21, wherein the guide device (5) is configured in such a way that the guide device (5) completely covers the guide element (6) on a side of the guide element (6) opposite the guide element surface (7).

25. The lifting column (1) according to claim 21, wherein the guide element surface (7) is made, at least in sections, of a soft material whose hardness is lower than that of the second hollow profile element (3).

26. The lifting column (1) according to claim 21, wherein the guide element (6) is made entirely of a soft material.

27. The lifting column (1) according to claim 21, wherein the guide device (5) comprises a clamping device (17) by which a clamping force can be applied, by which the guide element (6) can be displaced in a direction of an outer surface of the second hollow profile element (3).

28. The lifting column (1) according to claim 27, wherein the clamping force of the clamping device (17) can be preset by a screw connection.

29. The lifting column (1) according to claim 21, wherein the lifting column (1) comprises a transmission unit (9) which connects the first hollow profile element (2) and the second hollow profile element (3) and by which the first hollow profile element (2) and the second hollow profile element (3) can be displaced relative to one another, wherein the transmission unit (9) is enclosed by the first hollow profile element (2) and/or the second hollow profile element (3).

30. The lifting column (1) according to claim 29, wherein the transmission unit (9) is configured as a ball screw (10), and wherein the ball screw (10) comprises a threaded shaft (12) and a ball screw nut (11).

31. The lifting column (1) according to claim 30, wherein the transmission unit (9) can be driven by means of a drive unit (20).

32. The lifting column (1) according to claim 30, wherein the ball screw nut (11) of the ball screw (10) is fixed to one end of the second hollow profile element (3) and an end region (13) of the threaded shaft (12) protrudes from the second hollow profile element.

33. The lifting column (1) according to claim 31, wherein the threaded shaft (12) of the ball screw (10) is driven by the drive unit (20) via a drive wheel (14) fixed to an end region (13) of the threaded shaft (12).

34. The lifting column (1) according to claim 32, wherein threads are removed from the end region (13) of the threaded shaft (12) by mechanical machining and the end region (13) is separated from the threads by an abutment element (15).

35. The lifting column (1) according to claim 30, wherein the threaded shaft (12) comprises, at least at one end region (13) of the threaded shaft (12), a stop element (16) which, in an end position of the threaded shaft (12), is in contact with the ball screw nut (11) and/or with a frame component.

36. The lifting column (1) according to claim 35, wherein the stop element (16) surrounds the threaded shaft (12) at least in sections along an outer circumferential surface of the threaded shaft (12).

37. The lifting column (1) according to claim 35, wherein the stop element (16) consists of an elastically deformable material.

38. The lifting column (1) according to one of claim 35, wherein the stop element (16) is configured as a spring element.

39. A height-adjustable work table (18), comprising at least two lifting columns (1) according to claim 29, wherein a worktop (21) is fixed in an end region (13) of the first hollow profile elements (2), and wherein the transmission units (9) are connected to one another via a drive connection element (19) and can be driven by means of the drive unit (20).

40. The height-adjustable work table (18) according to claim 39, wherein the drive connecting element (19) is guidable within connecting hollow profile elements arranged between the lifting columns (1).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1 shows a schematic illustration of the lifting column in a sectional view,

[0033] FIG. 2 shows a schematic illustration of the guiding device and

[0034] FIG. 3 shows a schematic illustration of a height-adjustable work table.

DETAILED DESCRIPTION

[0035] FIG. 1 shows a schematic illustration of a lifting column 1 in a sectional view. The lifting column 1 comprises a first hollow profile element 2 and a second hollow profile element 3, which are arranged so as to be telescopic relative to one another. The hollow profile elements 2,3 are each configures as hollow tubes with a square cross-section. The second hollow profile element 3 is arranged inside the first hollow profile element 2 and is partially enclosed by the latter. In an upper edge region 4 of the first hollow profile element 2, a guide device 5 with guide elements 6 is attached as shown in FIG. 2. The two hollow profile elements 2,3 are movably connected to each other via a transmission unit 9 enclosed by the first hollow profile element 2 and/or the second hollow profile element 3. The transmission unit 9 is configured as a ball screw 10, which comprises a ball screw nut 11 and a threaded shaft 12. The ball screw nut 11 is arranged and fixed at one end of the second hollow profile element 3. By mechanically machining the threaded shaft 12 in an end region 13 of the threaded shaft 12, a shaft shoulder having a keyway formed therein is formed. A drive wheel 14 is pushed onto this shaft shoulder and fixed to the threaded shaft 12 by means of a key connection. In the process, the drive wheel 14 is pushed onto the shaft shoulder until it rests against an abutment element 15. The abutment element 15 is formed by a spacer washer welded to the end of the shaft shoulder. The threaded shaft 12 comprises a stop element 16 made of a rubber-like material in each of the two end regions. By means of the stop elements 16, the two end positions of the traverse movement of the threaded shaft 12 are fixed. Thereby, in the end positions of the threaded shaft 12, the respective stop element 16 is brought into contact with the ball screw nut 11 or a frame component and the shock-like contact is thus damped. The lifting column 1 rests on a machine base 22 attached to the lower end of the second hollow profile element 3.

[0036] FIG. 2 shows a schematic illustration of the guide device 5. Here, the guide elements 6 are arranged around the circumference of the second hollow profile element 3 and are detachably connected to the guide device 5. The guide element surface 7 of the guide element 6 rests against an outer surface 8 of the second hollow profile element 3. The guide elements 6 are made entirely of a brass alloy, the hardness of which is lower than that of the second hollow profile element. The guiding device 5 comprises a clamping device 17, which is configured as a screw connection. By means of the screw connection, a clamping force can be applied with which the guide elements 6 are displaced in the direction of the outer surface 8 of the second hollow profile element 3. The level of the clamping force can be used to achieve play-free guidance of the second hollow profile element 3 within the first hollow profile element 2.

[0037] FIG. 3 shows a schematic illustration of a height-adjustable work table 18 with multiple lifting columns 1. The height-adjustable work table 18 comprises a worktop 21 that is fixed to the first hollow profile element 2. In this case, the transmission units 9 of the lifting columns 1 are connected to one another via a drive connecting element 19 configured as a drive chain. The drive chain can be driven via a common drive unit 20. In this exemplary embodiment, the drive unit 20 is configured as an electric drill, whereby the drive torque applied by the electric drill is transmitted to the transmission units 9 via a worm gear via the drive connection element 19. After the height-adjustable work table 18 has been adjusted, the electric drilling machine can be disconnected from the worm gear again. In a compressed state of the lifting column 1, the work table 19 rests on the ground via a plurality of heavy-duty rollers 23, with no contact between the machine feet 22 and the ground. Thus, the work table 18 can be moved manually.