Lifting column

Abstract

The invention relates to a lifting column (2) having five column-shaped elements (4, 6, 8, 10, 12) arranged in a nested manner at least in sections, and a first spindle drive (20) for moving the three column-shaped elements (8, 10, 12) closest to the inside relative to one another, and a second spindle drive (30) for moving the three column-shaped elements (4, 6, 8) closest to the outside relative to one another. Furthermore, a coupling tube assembly (40) is provided which operatively connects the first spindle drive (20) to the second spindle drive (30).

Description

Technical Field

[0001] The present invention relates to a lifting column. Background Art

[0002] In order to lift a load, known lifting columns usually have two or more columnar elements arranged in a box-like manner. In order to telescope the lifting column, i.e. to move the columnar elements relative to each other, at least one motor is usually arranged inside the lifting column. Usually, the motor is driven by a screw transmission consisting of a screw shaft and a screw nut. The stroke of the lifting column is in this case limited by the stroke of the screw nut on the screw shaft. In order to extend the stroke, a telescopic screw shaft or a rope traction system connected to the screw transmission can be used. Alternatively, two screw transmissions can also be used, each of which is driven by a motor. Summary of the invention

[0003] The object of the present invention is to provide an improved lifting column. In particular, the object of the present invention is to provide a lifting column with a large stroke, labor-saving assembly and synchronously movable columnar elements.

[0004] This object is achieved by a lifting column according to the independent claim.

[0005] Preferred embodiments are the subject matter of the dependent claims and the following description.

[0006] A first aspect of the invention relates to a lifting column having five columnar elements arranged at least in sections and nested in a manner, and a first screw drive for moving the three innermost columnar elements relative to each other, and a second screw drive for moving the three outermost columnar elements relative to each other. In addition, a coupling pipe assembly is provided, which operatively connects the first screw drive with the second screw drive.

[0007] The operative connection referred to in the present invention is preferably a coupling, in particular a mechanical coupling. Thus, the coupling tube assembly is at least part of the operative connection between the first and second screw drives, i.e. the first and second screw drives are operatively connected to each other via the coupling tube assembly. The operative connection can also be suitably achieved if a transmission mechanism and / or a drive assembly is installed in between, for example by (in each case) coupling the transmission mechanism, the drive assembly directly or indirectly driving one of the screw drives and the coupling tube assembly.

[0008] The screw drive device referred to in the present invention is preferably a component that converts a rotational motion into a translational motion. The screw drive device is also called a screw drive mechanism, which appropriately has at least one screw shaft and a screw shaft nut, which runs on the external thread of the screw shaft. The screw shaft is preferably screwed directly into the screw shaft nut in this case. Alternatively, the screw drive device can also be a ball screw drive or a planetary drive mechanism, in which rolling bodies, such as balls or planetary rollers, roll between the screw shaft and the screw shaft nut. The screw drive device in the sense of the present invention can also have a hollow shaft and a corresponding hollow shaft nut. The screw drive device in the sense of the present invention can also alternatively or additionally have a hollow shaft and a corresponding hollow shaft nut.

[0009] One aspect of the invention is based on a method for synchronizing two screw drives of a lifting column by means of a coupling tube assembly, which screw drives are respectively used to generate a relative movement of three columnar elements. As a result, only one drive assembly is required to achieve the extension and retraction of the lifting column. As a result, the lifting column is simpler in design than a lifting column with a rope traction system. In addition, no damping is required for the columnar elements. This can save on components in particular. In this connection, not only is production simplified, but costs are also reduced.

[0010] Furthermore, a flexible design of the lifting column is possible. For example, the drive assembly can be operatively connected to the first or second screw drive or to the coupling tube assembly. Thus, the drive assembly can be arranged in any columnar element as required, in particular in the outermost, second outermost, middle or second innermost columnar element.

[0011] Arranged in a specific column element in the sense of the present invention is preferably arranged on the floor or ceiling of the respective column element. Arranged in a column element is therefore in particular arranged in the column element in any operating state. For example, in the retracted state of the lifting column, although in a literal sense a drive assembly arranged in the innermost column element can also be arranged in a column element placed further outwards, in the extended state the drive assembly can only be arranged in the innermost column element.

[0012] By arranging the coupling tube of the coupling tube assembly parallel to the first and second screw drives, a reliable and space-saving operative connection of the first and second screw drives can be achieved. The coupling tube is suitably rotatably supported in the lifting column, for example rotatably supported on the third column element.

[0013] The coupling tube assembly is suitably arranged for transmitting torque from one columnar element to another columnar element, in particular across at least one columnar element, such as a columnar element of the intermediate piece. This means that the torque can be transmitted to the coupling tube via one of the columnar elements, for example the second inner columnar element, and provided to the other columnar element, for example the second outer columnar element. This can be suitably achieved regardless of the degree of telescopic extension of the lifting column, i.e. the degree of displacement of the columnar elements relative to one another. The coupling tube assembly enables an operational connection between the first and second screw drives that is particularly low in components and mechanically strong.

[0014] Preferred embodiments of the invention and further embodiments thereof are described below, and unless explicitly excluded, the individual embodiments and further embodiments thereof may be combined arbitrarily with one another and with the various aspects of the invention described further below.

[0015] Space can be saved by the following design, that is, the first and second screw drives each have only a telescopic shaft with an internal screw shaft and an external hollow shaft. The screw shaft is preferably a shaft with an external thread or a spirally extending groove for guiding the rolling elements. Correspondingly, the hollow shaft is preferably a hollow shaft with an external thread or a spirally extending groove for guiding the rolling elements. In addition to the space-saving design of the first and second screw drives, this also allows the innermost and outermost cylindrical elements to be moved very reliably and precisely relative to each other.

[0016] In order to make the three outermost or three innermost three columnar elements move synchronously relative to each other, the first hollow shaft of the first screw drive is preferably rotatably supported on the second inner columnar element. Alternatively or in addition, the second hollow shaft of the second screw drive is rotatably supported on the second outer columnar element. In this case, the hollow shafts are appropriately operatively connected via a coupling tube assembly. This means that the rotation of the first hollow shaft can be transmitted to the second hollow shaft by means of the coupling tube assembly, and vice versa. The synchronous movement between the columnar elements that can be achieved in this way is very aesthetically pleasing to the user.

[0017] The swivel mounting of the hollow shaft on the second inner or second outer cylindrical element preferably includes an axial fixing of the hollow shaft on the respective cylindrical element.

[0018] In the case of such a rotational support of the hollow shaft, the movement out and in of each screw shaft can be achieved by each hollow shaft having a built-in screw shaft nut. The screw shaft nut can be mounted on the hollow shaft in a rotationally fixed manner or constructed integrally with the hollow shaft. The screw shaft nut is suitably operatively connected to the corresponding screw shaft, for example by engaging the corresponding thread or by the corresponding rolling body. In this case, the screw shaft is suitably arranged rotatably relative to the respective hollow shaft (and the screw shaft nut connected thereto in a rotationally fixed manner), for example, arranged in a rotationally fixed manner at the middle columnar element or the outermost columnar element. In this case, the screw shaft is suitably fixed axially to the middle or outermost columnar element, for example, rigidly connected to the columnar element. The advantage of this method is that it is no longer necessary to transmit force from the screw transmission to the columnar element through a support portion for supporting the screw transmission components, especially the hollow shaft and the screw shaft. Therefore, in order to realize the rotational support of the screw transmission components, small roller bearings can be used, or even only sliding bearings can be used.

[0019] However, it is also conceivable that the screw shaft is rotatably supported on the middle or outermost cylindrical element. In this case, the screw drive preferably has a shaft synchronization element in each case in order to transmit torque between the hollow shaft and the screw shaft in an appropriate manner. For example, the shaft synchronization element can be mounted on each screw shaft in a torsionally fixed manner. The hollow shaft preferably has an inner shaft contour, on which the shaft synchronization element is supported in a torsionally fixed and axially movable manner.

[0020] In the sense of the invention, a profile is a configuration of a surface of a preferably substantially cylindrical body which prevents a component complementary to the surface and at least partially resting on the surface from moving in the circumferential direction, but allows an axial movement. In principle, an arrangement outside or inside the body is conceivable. This can therefore be referred to as an outer profile or inner profile.

[0021] Analogously to the coupling tube assembly, the torque can be transmitted from one of the cylindrical elements to the other cylindrical element by means of the shaft synchronization. Thus, for example, it is conceivable that the second screw shaft rotatably supported on the outermost cylindrical element is driven by means of the drive assembly and the corresponding torque is transmitted by means of the associated shaft synchronization to the second hollow shaft rotatably supported on the second outer cylindrical element. The screw drive is operatively connected by means of the coupling tube assembly, whereby the torque can be further transmitted to the first screw shaft rotatably supported on the middle cylindrical element and further to the first hollow shaft by means of the associated shaft synchronization.

[0022] A particularly efficient, particularly easy-to-install and space-saving arrangement of the coupling tube assembly in the lifting column can be achieved by rotatably mounting the coupling tube on the intermediate cylindrical element. In this way, a mechanical, substantially axial play-free or play-free operative connection between the first and second screw drives can be achieved across the intermediate cylindrical element.

[0023] In this case, it is also conceivable to couple two similar screw drives together. Thus, further effort and thus costs can be saved if the first screw drive and the second screw drive are of identical construction. Thus, both the hollow shaft of the screw drive and the screw shaft can be designed to run in a clockwise direction.

[0024] Alternatively or in addition, the coupling tube also has an inner tube profile on which the inner tube synchronizer is supported in a torsionally fixed and axially movable manner. In this case, the inner tube synchronizer is used to transmit torque between the coupling tube and the second screw drive, in particular the second hollow shaft, or between the coupling tube and a motor-driven shaft. If the coupling tube is driven by a motor, its rotation can be transmitted to the second hollow shaft. On the other hand, if the shaft or the second screw shaft is driven by a motor, the rotation of the second hollow shaft or the above-mentioned shaft can be transmitted to the coupling tube.

[0025] The motor-driven shaft is expediently part of the coupling tube assembly. The shaft is preferably supported in the coupling tube axially movably by means of an inner tube synchrotron and is connected to the coupling tube in a rotationally fixed manner. In this case, the inner tube synchrotron is preferably mounted in a rotationally fixed manner on the shaft. Alternatively, however, the inner tube synchrotron can also be formed integrally with the shaft. It is particularly conceivable that the shaft has, at least in sections, an outer shaft contour that is complementary to the inner tube contour.

[0026] Preferably, the shaft is rotatably supported on a cylindrical element different from the middle cylindrical element, for example, on a second outer cylindrical element. Accordingly, in this case, the drive assembly is preferably also arranged in the second outer cylindrical element.

[0027] By providing the shaft, a telescopic coupling tube assembly can be formed. As a result, the coupling tube does not have to be arranged concentrically with the second screw drive, in particular the second hollow shaft. This allows a certain degree of freedom in the arrangement of the first and second screw drives and the coupling tube assembly in the lifting column.

[0028] Alternatively, the second screw drive, in particular the second hollow shaft, can also be operatively connected, in particular torque-proof connected, to the coupling tube via an inner tube synchronizing element. In this case, the inner tube synchronizing element can be mounted torque-proof on the second hollow shaft. In this case, the coupling tube is expediently arranged coaxially with the second screw drive, in particular the second hollow shaft. This enables a particularly space-saving arrangement of the coupling tube assembly.

[0029] In an alternative embodiment, the same advantages can also be achieved if the inner tube synchronizing element is part of the second screw drive, in particular the second hollow shaft. In this case, the inner tube synchronizing element and the second hollow shaft are preferably designed as one piece. In particular, the hollow shaft can have, at least in sections, a hollow shaft outer contour that is designed complementary to the inner tube contour.

[0030] In order to be able to transmit a rotational movement across the cylindrical elements by means of the coupling tube assembly, in particular from the second outer cylindrical element to the second inner cylindrical element, the coupling tube preferably has an outer tube contour on which the outer tube synchronizer is supported in a rotationally fixed and axially movable manner. The outer tube synchronizer is expediently part of the coupling tube assembly and is preferably operatively connected to the first screw drive, in particular to the first hollow shaft or the first screw shaft.

[0031] A second aspect of the invention relates to an x-ray system with an x-ray source, an x-ray detector and a lifting column according to the first aspect of the invention. The x-ray source or the x-ray detector is hereby suitably mounted on a lifting column. With the aid of the lifting column, the components of the system can be positioned at a short distance from the ceiling or the floor. In this way, the components can be moved precisely relative to each other, regardless of whether they are pulled or pushed for positioning.

[0032] As an alternative to use in a x-ray system, the lifting column according to the first aspect of the invention may also be used in an automated system, ie as part of one or more robots. It is also conceivable to use the lifting column in a possibly mobile goods or passenger elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The invention is further explained below with reference to the drawings. Elements with the same function are marked with the same reference numerals in this document, as far as this is suitable for the purpose. The invention is not restricted to the embodiments shown in the drawings, nor is it restricted thereto in terms of functional features. The preceding description and the following description of the drawings contain many features, some of which are reflected in a variety of combinations in the dependent claims. However, the skilled person will also consider these features and all other features disclosed in the preceding and following description of the drawings individually and combine them to form useful further combinations. In particular, all of the above-mentioned features can be combined individually and in any suitable combination with the lifting column according to the first aspect of the invention and the x-ray system according to the second aspect of the invention.

[0034] In the accompanying drawings, at least partially schematically shown:

[0035] Figure 1 A first example of a lifting column is shown;

[0036] Figure 2 A second example of a lifting column is shown;

[0037] Figure 3 A third example of a lifting column is shown; and

[0038] Figure 4 An example of a Roentgen system is shown. DETAILED DESCRIPTION

[0039] Figure 1 A first example of a lifting column 2 is shown, which has five column elements 4, 6, 8, 10, 12 arranged at least sectionally nested. In particular, the second outer column element 6 is arranged at least sectionally in the outermost column element 4, the middle column element 8 is arranged at least sectionally in the second outermost column element 6, the second innermost column element 10 is arranged at least sectionally in the middle column element 8, and the innermost column element 12 is arranged at least sectionally in the second innermost column element 10. The column elements 4, 6, 8, 10, 12 are rotationally fixed relative to each other.

[0040] By means of the first screw drive 20 and the second screw drive 30, the column elements 4, 6, 8, 10, 12 can be moved axially relative to each other. The two screw drives 20, 30 expediently work in a complementary manner. This means that the first screw drive 20 can move the three innermost column elements 8, 10, 12 relative to each other, while the second screw drive 30 can move the three outermost column elements 4, 6, 8 relative to each other. As a result, it is possible to increase the stroke compared to conventional lifting columns, or at least to achieve a comparable stroke in a significantly more robust embodiment.

[0041] The coupling tube assembly 40 operatively connects the first screw transmission 20 with the second screw transmission 30. This means that the coupling tube assembly 40 is part of the operative connection between the first screw transmission 20 and the second screw transmission 30. In this example, the operative connection also includes a drive assembly 50. The drive assembly 50 has a motor 52 and an optional first transmission mechanism 54 and / or a second transmission mechanism 56 for transmitting the torque generated by the motor 52 to the first screw transmission 20 or the coupling tube assembly 40.

[0042] The first screw drive 20 has a first hollow shaft 22 and a first screw shaft 24 arranged at least in sections therein. The first hollow shaft 22 can be driven directly by a motor 52, in particular via a first transmission mechanism 54. The first hollow shaft 22 has a first screw shaft nut 26 built into it, into which the first screw shaft 24 is screwed.

[0043] The second screw transmission 30 is constructed to be substantially identical in structure to the first screw transmission 20. The second screw transmission has a second hollow shaft 32 and a second screw shaft 34 arranged at least in sections therein. The second hollow shaft can be driven indirectly by a motor 52, i.e., through a coupling tube assembly 40. If necessary, the coupling tube assembly 40 can be operatively connected to the motor 52 via a second transmission mechanism 56. The second hollow shaft 32 has a second screw shaft nut 36 built into it, into which the second screw shaft 34 is screwed.

[0044] In order to achieve synchronous movement of the three innermost cylindrical elements 8, 10, 12 relative to each other, the first hollow shaft 22 is rotatably supported on the second innermost cylindrical element 10 and is simultaneously axially fixed thereto. The first screw shaft 24 is mounted in a rotationally fixed manner on the middle cylindrical element 8. The first hollow shaft nut 28 is mounted in a rotationally fixed manner on the innermost cylindrical element 12, into which the first hollow shaft 22 is screwed via an external thread 22a.

[0045] Therefore, during the rotation of the first hollow shaft 22 driven by the motor 52, the first hollow shaft nut 28 and the innermost columnar element 12 move axially along the first hollow shaft 22, thereby moving relative to the second innermost columnar element 10, and the first screw shaft 24 moves out of or into the first hollow shaft 22, thereby causing the middle columnar element 8 to move relative to the second innermost columnar element 10.

[0046] In order to achieve synchronous movement of the three outermost columnar elements 4, 6, 8 relative to each other, the coupling tube assembly 40 has a coupling tube 42 arranged coaxially with the second screw drive 30, in particular the second hollow shaft 32. The coupling tube 42 has a tube outer contour 42a, on which the outer tube synchronization element 44 is supported in a torsionally fixed and axially movable manner. The outer tube synchronization element 44 can therefore transmit torque to the coupling tube 42. The outer tube synchronization element 44 is operatively connected to the motor 52, in particular operatively connected via the second transmission mechanism 56.

[0047] The coupling tube 42 also has a tube inner profile 42b on which the inner tube synchro 46 is supported in a torsionally fixed and axially movable manner. The inner tube synchro 46 is mounted in a torsionally fixed manner on the second hollow shaft 32. Therefore, the coupling tube 42 can transmit the rotation driven by the motor 52 to the second hollow shaft 32.

[0048] In this case, the coupling tube 42 is rotatably supported at the middle cylindrical element 8, while the second hollow shaft 32 is rotatably supported on the second outer cylindrical element 6. Therefore, the function of the coupling tube assembly 40 is to transfer torque from the second inner cylindrical element 10 across the middle cylindrical element 8 to the second outer cylindrical element 6.

[0049] The second hollow shaft nut 38 is mounted in a rotationally fixed manner on the middle cylindrical element 8 , into which the second hollow shaft 32 is screwed via an external thread 32 a. The second spindle shaft 34 is mounted in a rotationally fixed manner on the outermost cylindrical element 4 .

[0050] Therefore, during the rotation of the second hollow shaft 22 driven by the motor 52 and transmitted by the connecting tube assembly 40, the second hollow shaft nut 38 and the middle columnar element 8 move axially along the second hollow shaft 22, thereby moving relative to the second outermost columnar element 6, and the second screw shaft 34 moves out of or into the second hollow shaft 34, thereby causing the outermost columnar element 4 to move relative to the second outermost columnar element 6.

[0051] As an alternative to the arrangement shown in which the drive assembly 50 is arranged in the second inner cylindrical element 10, it is also conceivable to arrange it in the second outer cylindrical element 6. The motor 52 is then directly operatively connected to the second hollow shaft 32, if necessary via the first transmission mechanism 54. The second hollow shaft 32 can transmit the torque applied thereby to the outer tube synchronizer 44 via the inner tube synchronizer 46 and the coupling tube 42. The outer tube synchronizer 44 is appropriately, for example, operatively connected to the first hollow shaft 22 via the second transmission mechanism 56.

[0052] The outer tube contour 42a and / or the inner tube contour 42b can be formed by a non-circular outer contour or inner contour of the coupling tube 42 in the circumferential direction. In this case, the coupling tube 42 preferably has such a non-circular outer contour at least over most of its length. The coupling tube 42 preferably does not have a non-circular outer contour in the rotation bearing area on the middle columnar element 8. For example, the non-circular inner contour or outer contour can be formed by the cross section of the coupling tube 42 being an elliptical or angular outer contour shape or inner contour shape. Alternatively, it is also conceivable to provide an axially extending groove or web in or on the complementary web or groove of the tube synchronizer 44, 46 in a close or embedded manner. However, other designs are also conceivable in principle.

[0053] The lifting column 2 can support a load (not shown). Figure 1 For the lifting column 2 shown, it has proven to be advantageous that the loads are not supported by the bearings for supporting the components of the first and second screw drives 20, 30 and the coupling tube assembly 40. Instead, the force flows caused by such loads are supported completely by the first and second hollow shafts 22, 32, the first and second screw shafts 24, 34 and the nuts 26, 28, 36, 38. Instead, the force flows caused by such loads are supported completely by the first and second hollow shafts 22, 32, the first and second screw shafts 24, 34 and the nuts 26, 28, 36, 38.

[0054] Figure 2 A second example of a lifting column 2 is shown, which has five column elements 4, 6, 8, 10, 12, which are arranged at least partially nested and can be axially moved relative to one another by means of a first screw drive 20 and a second screw drive 30. Figure 1 The lifting column shown differs in that the drive assembly 50 is arranged in the second outer column element 6 , while the coupling tube assembly 40 , in particular the coupling tube 42 , is not arranged coaxially with the second spindle drive 30 .

[0055] In contrast, the coupling tube assembly 40 is disposed separately from the first and second screw drives 20 and 30 and is operatively connected to the first and second screw drives via the first and second transmission mechanisms 54 and 56 .

[0056] In particular, the coupling tube assembly 40 has a shaft 48, which is rotatably supported on the second outer cylindrical element 6. The shaft 48 can be driven by means of a motor 52 and is operatively connected to the second hollow shaft 32 via a first transmission mechanism 54. The inner tube synchronizer 46 is mounted on the shaft 48 in a rotationally fixed manner or is integrally formed with the shaft, so that the rotation of the shaft 48 driven by the motor 52 is transmitted to the coupling tube 42. The outer tube synchronizer 44 is operatively connected to the first hollow shaft 22, in particular via a second transmission mechanism 56. As a result, the torque can be transmitted from the second outer cylindrical element 6 via the middle cylindrical element 8 to the second inner cylindrical element 10.

[0057] The separate arrangement of the coupling tube assembly 40 makes the arrangement of the coupling tube assembly 40 together with the first and second screw drives 20 and 30 in the lifting column 2 particularly effective. For example, the first and second screw drives 20 and 30 and the coupling tube assembly 40 can be installed in a particularly space-saving triangular arrangement.

[0058] In this variant, the bearings for supporting the spindle drives 20 , 30 are also not loaded.

[0059] Figure 3 A third example of a lifting column 2 is shown, which has five column elements 4, 6, 8, 10, 12, which are arranged at least partially nested and axially displaced relative to one another by means of a first screw drive 20 and a second screw drive 30. Figure 1 and Figure 2 The difference from the example shown in the figure is that the screw shafts 24, 34 each have a shaft synchronizer 24a, 34a, which can be mounted on the screw shafts 24, 34 in a rotationally fixed manner or can be constructed integrally with the screw shafts. The shaft synchronizer 24a, 34a is supported on the shaft inner contour 22b, 32b of the first hollow shaft 22 or the second hollow shaft 32 in a rotationally fixed and axially movable manner. Therefore, the hollow shafts 22, 32 are not operatively connected to the respective screw shafts 24, 34 through an internally arranged rotationally fixed or integrally constructed screw shaft nut, but through the shaft synchronizer 24a, 34a, in particular, connected in a rotationally fixed manner.

[0060] The spindle shafts 24, 34 are supported in a rotationally fixed manner on the middle cylindrical element 8 or the outermost cylindrical element 4. In this case, the second spindle shaft 34 is directly operatively connected to a drive assembly 50 which is also arranged in the outermost cylindrical element 4.

[0061] The first screw shaft 24 is operatively connected to the coupling tube 42 in the middle cylindrical element 8 via the first transmission 54. Since both the first screw shaft 24 and the coupling tube 42 are supported in a rotationally fixed manner on the middle cylindrical element 8 and are thus axially fixed, no outer tube synchronization is required.

[0062] In order to move the cylindrical elements 4, 6, 8, 10, 12 synchronously relative to each other, the screw shafts 24, 34 are screwed into screw shaft nuts 26, 36 which are mounted in a torque-proof manner in the second inner cylindrical element 10 or the second outer cylindrical element 6. Thus, when the screw shafts 24, 34 rotate, the second inner cylindrical element 10 moves relative to the middle cylindrical element 8, and the second outer cylindrical element 6 moves relative to the outermost cylindrical element 4.

[0063] The hollow shaft 22, 32 is screwed into a hollow shaft nut 28, 38 which is torque-proof mounted in the middle columnar element 8 or the innermost columnar element 12, so that when the hollow shaft 22, 32 rotates, the innermost columnar element 12 moves relative to the second innermost columnar element 10, and the middle columnar element 8 moves relative to the second outermost columnar element 6.

[0064] Therefore, the torque applied by the motor 52 is transmitted from the outermost columnar element 4 to the second outermost columnar element 6 through the second screw transmission device 30, from the second outermost columnar element 6 to the middle columnar element 8 through the connecting tube assembly 40, and from the middle columnar element 8 to the second innermost columnar element 10 through the first screw transmission device 20.

[0065] exist Figure 3 In the example shown, Figure 1 and Figure 2 Unlike the example shown, the force flow flows through the hollow shafts 22, 32 and the bearings of the lead screw shafts 24, 34. For this purpose, the drive assembly 50, in particular the motor 52, can be arranged in the outermost column element 4. This can facilitate the installation of the lifting column 2 and / or the energy supply of the motor 52, for example, if the lifting column 2 is used as a floor or ceiling support and the outermost column element 4 is located on the ground or the outermost column element 4 is connected to the ceiling.

[0066] Figure 4 An example of an x-ray room is shown, in which an x-ray system 100 is equipped with an x-ray source 110 and two x-ray detectors 120 and two lifting columns 2, in particular five-fold telescopic lifting columns. Here, one of the x-ray detectors 120 is integrated into a patient table 130, while the other x-ray detector 120 is part of a wall device and can be adjusted in height by means of one of the lifting columns 2. The x-ray source 110 is also supported in a height-adjustable manner by means of another lifting column 2.

[0067] In this regard, the lifting column 2 can generally be used as a bracket, in particular a floor bracket and / or a ceiling bracket.

[0068] Reference numerals list

[0069] 2 Lifting columns

[0070] 4 Outermost columnar element

[0071] 6 The second outermost columnar element

[0072] 8 The middle columnar element

[0073] 10 The second outermost columnar element

[0074] 12 Innermost columnar element

[0075] 20 First screw drive

[0076] 22 First hollow shaft

[0077] 22a External thread

[0078] 22b Shaft inner profile

[0079] 24 First screw shaft

[0080] 24a First shaft synchronizing element

[0081] 26 First screw shaft nut

[0082] 28 First hollow shaft nut

[0083] 30 Second screw drive

[0084] 32 Second hollow shaft

[0085] 32a External thread

[0086] 32b Shaft inner profile

[0087] 34 Second screw shaft

[0088] 34a Second shaft synchronizing element

[0089] 36 Second screw shaft nut

[0090] 38 Second hollow shaft nut

[0091] 40 Connecting pipe assembly

[0092] 42 Connecting pipe

[0093] 42a Tube outer profile

[0094] 42b Inner profile of tube

[0095] 44 Outer tube synchro

[0096] 46 Inner tube synchro

[0097] 48 Axis

[0098] 50 Drive components

[0099] 52 Motor

[0100] 54 First transmission mechanism

[0101] 56 Second transmission mechanism

[0102] 100 roentgen system

[0103] 110 Roentgen ray source

[0104] 120 Roentgen ray detector

[0105] 130 patient stations

Claims

1. A lifting column (2), comprising: - five columnar elements (4, 6, 8, 10, 12) arranged in at least segmented nested fashion; - a first screw drive (20) for moving the three innermost cylindrical elements (8, 10, 12) relative to each other; - a second screw drive (30) for moving the three outermost cylindrical elements (4, 6, 8) relative to each other; and - A coupling tube assembly (40) operatively connecting the first screw transmission (20) and the second screw transmission (30).

2. The lifting column (2) according to claim 1, in, The first and second screw drives (20, 30) each have a telescopic shaft with an inner screw shaft (24, 34) and an outer hollow shaft (22, 32).

3. The lifting column (2) according to claim 2, in, The first hollow shaft (22) of the first screw drive (20) is rotatably supported on the second inner cylindrical element (10), and the second hollow shaft (32) of the second screw drive (30) is rotatably supported on the second outer cylindrical element (6).

4. A lifting column (2) according to claim 2 or 3, in, The hollow shafts (22, 32) each have a built-in screw shaft nut (26, 36), which is operatively connected to the respective screw shaft (24, 34).

5. The lifting column (2) according to claim 2 or 3, in, The spindle shaft (24, 34) has a shaft synchronizer (24a, 34a), and the hollow shaft (22, 32) has a shaft inner contour (22b, 32b), on which the shaft synchronizer (24a, 34a) is supported in a rotationally fixed and axially displaceable manner.

6. Lifting column (2) according to any one of the preceding claims, in, The connecting pipe (42) of the connecting pipe assembly (40) is rotatably supported on the middle columnar element (8).

7. Lifting column (2) according to any one of the preceding claims, in, The first screw transmission device (20) and the second screw transmission device (30) are of the same structure.

8. Lifting column (2) according to any one of the preceding claims, in, The connecting pipe assembly (40) has an inner pipe synchronizer (46) which is supported on a pipe inner contour (42b) of the connecting pipe (42) in a torsionally fixed and axially movable manner.

9. The lifting column (2) according to claim 8, in, The coupling tube assembly (40) has a shaft (48) which can be driven by a motor and is supported in the coupling tube (42) in an axially displaceable manner by means of the inner tube synchronizer (46) and is connected to the coupling tube (42) in a rotationally fixed manner.

10. The lifting column (2) according to claim 8, in, The second screw drive (30) is operatively connected to the coupling tube (42) via the inner tube synchronizer (46).

11. Lifting column (2) according to any one of the preceding claims, in, The connecting pipe assembly (40) has an outer pipe synchronizer (44) which is supported on a pipe outer contour (42a) of the connecting pipe (42) in a rotationally fixed and axially displaceable manner.

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