Mechanical lift column, surgical table with such a mechanical lift column and lift column kit

Abstract

The invention relates to a mechanical lifting column (1) having a first hollow profile (2), a second hollow profile (3), a spring element (4), at least one lever assembly (5) and a holding mechanical structure (6). The first hollow profile (2) has a first longitudinal direction (L1) and the second hollow profile (3) has a second longitudinal direction (L2). The first longitudinal direction (L1) of the first hollow profile (2) and the second longitudinal direction (L2) of the second hollow profile (3) extend along a common, preferably vertical direction. The second hollow profile (3) is telescopically movable from a retracted position, in which the first hollow profile (2) is arranged substantially completely in the second hollow profile (3), into an extended position, in which the first hollow profile (2) is arranged only partially in the second hollow profile (3).

Description

Technical Field

[0001] This invention relates to a mechanical lifting column. It also relates to an operating table having such a mechanical lifting column and a lifting column kit. Background Technology

[0002] Lifting columns are known in the prior art and are primarily used for operating tables or desks to provide height adjustment of the tabletop. Here, height adjustment is typically achieved via a hydraulic system and / or an electric actuator, depending on the expected load in the application. For example, such a hydraulic lifting column is known from EP 3 646 841 A1. While this adjustment mechanism is perfectly suitable for adjusting the height of the operating tabletop, it is complex and generally expensive.

[0003] In addition, for operating tables, regulations stipulate regular maintenance of the lifting columns to ensure compliance with prescribed operating procedures and safeguard the safety of patients on the operating table.

[0004] If the bollard is electrically adjustable, it always needs to be connected to a power source or requires an integrated battery to operate, which limits the location or duration of use of the bollard. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide a rising bollard that is cost-effective and flexible in use.

[0006] This objective is achieved by the mechanical lifting column according to claim 1. Advantageous improvements are described in the dependent claims.

[0007] According to a first aspect, the present invention relates to a mechanical lifting column having a first hollow profile, a second hollow profile, a spring element, at least one lever assembly, and a retaining mechanism. The first hollow profile extends along a first longitudinal direction, and the second hollow profile extends along a second longitudinal direction, wherein the first longitudinal direction of the first hollow profile and the second longitudinal direction of the second hollow profile extend in the same, preferably vertical, direction. The second hollow profile is retractably movable from a retracted position to an extended position, in which the first hollow profile is substantially completely disposed within the second hollow profile, and in the extended position, the first hollow profile is only partially disposed within the second hollow profile. At least one spring element is connected to the first and second hollow profiles such that the second hollow profile is preloaded relative to the first hollow profile in the direction toward the extended position. The lever assembly is disposed within the first hollow profile and connects the first and second hollow profiles. The retaining mechanism is configured to releasably prevent movement of the second hollow profile relative to the first hollow profile.

[0008] By pre-tensioning the second hollow profile relative to the first hollow profile toward the extended position, it provides support against the forces applied to the mechanical lifting column. This allows the mechanical lifting column to be manually moved from the retracted position to the extended position without requiring the operator to overcome the full force applied to it. The mechanical structure can also be used to lock the mechanical lifting column in the desired position.

[0009] Therefore, a rising bollard is provided that can be adjusted purely mechanically and can be manufactured cost-effectively. Furthermore, the mechanical rising bollard is low-wear and flexible in application, and in particular, requires no power supply.

[0010] Preferably, the mechanical lifting column has a first support portion and a second support portion. The first support portion is connected to a first hollow profile and preferably at least partially covers the first hollow profile. The second support portion is connected to a second hollow profile and preferably at least partially covers the second hollow profile. The first support portion has an opening. A guide portion is arranged on the side of the second support portion facing the first hollow profile, extending through the opening of the first support portion into the first hollow profile. A third support portion is arranged at the end of the guide portion opposite to the second support portion. At least one spring element is connected to the first support portion and the third support portion. It is also conceivable that the first support portion is arranged on the end of the first hollow profile facing the second hollow profile and / or the second support portion is arranged on the end of the second hollow profile away from the first hollow profile. This arrangement allows at least one spring element to be protected within the first and second hollow profiles from contamination and undesirable contact.

[0011] Preferably, the lever assembly has at least one corner rod, at least one first connecting rod, and at least one second connecting rod. The corner rod has a pivot point, a first leg, and a second leg. The first leg and the second leg extend from the pivot point. The pivot point is rotatably arranged on a first hollow profile about a first axis of rotation. The first connecting rod has a first end and a second end. The first end is rotatably arranged on a second hollow profile about a second axis of rotation. The second end is rotatably connected to the end of the first leg away from the pivot point about a third axis of rotation. The second connecting rod has a third end and a fourth end. The third end is rotatably connected to the end of the first leg away from the pivot point about a fourth axis of rotation. The fourth end has a roller rotatably supported about a fifth axis of rotation, the roller contacting the inner surface of the first hollow profile and rotatably connected to a third support about the fifth axis of rotation.

[0012] Preferably, the mechanical lifting column has two such lever assemblies, wherein a rotatably supported roller of the second lever assembly contacts the inner surface of the first hollow profile on the side opposite to the rotatably supported roller of the first lever assembly.

[0013] By connecting the first and second hollow profiles via a lever assembly, it is ensured that the second hollow profile will not tilt relative to the first hollow profile during movement, especially when a torque is applied to the second hollow profile. One or more rollers here support the second hollow profile orthogonally to the vertical direction relative to the first hollow profile and simultaneously allow for easy movement of the second hollow profile relative to the first hollow profile. In other words, one or more lever assemblies are used to reliably guide the second hollow profile relative to the first hollow profile when the forces acting on the mechanical lifting column are different.

[0014] Alternatively, a rotatably supported roller can be used to apply a clamping force to the inner surface of the first hollow profile, wherein the rotatably supported roller is preferably rotatably supported on a third support. The clamping force of the rotatably supported roller on the inner surface generates resistance against the movement of the second hollow profile relative to the first hollow profile. The mechanical lifting column can only move when this resistance is overcome. In other words, the resistance brakes the movement of the mechanical lifting column to avoid unwanted or excessively rapid movement.

[0015] Preferably, at least one sliding plate is disposed between the outer surface of the first hollow profile and the inner surface of the second hollow profile. The sliding plate allows the second hollow profile to move relative to the first hollow profile with low friction. Simultaneously, the sliding plate can be used to guide the second hollow profile relative to the first hollow profile. The contact surface of at least one sliding plate preferably has a low coefficient of friction. The sliding plate may be at least partially made of plastic, such as POM, PA, or PTFE.

[0016] Consideration may be made to the first or second hollow profile having at least one recess and the retaining mechanism including at least one locking element. The locking element is disposed on the other of the first or second hollow profile and releasably engages with at least one recess in the first or second hollow profile. This locking element reliably secures the second hollow profile relative to the first hollow profile. Thus, movement of the mechanical lifting column is prevented regardless of the applied force.

[0017] Advantageously, at least one recess and at least one locking element have corresponding geometries that prevent at least one locking element from releasing from at least one recess unless the force applied to the mechanical lifting column along the second longitudinal direction of the second hollow profile exceeds a defined force threshold. This configuration of the locking element and the recess prevents the locking element from moving out of the recess and the mechanical lifting column from moving too quickly to the retracted position when the applied force is too large. Simultaneously, it prevents the locking element from releasing and the mechanical lifting column from moving too quickly to the extended position due to the preload of the second hollow profile relative to the first hollow profile toward the extended position when the applied force is too small. This prevents damage to the mechanical lifting column and ensures reliable operation.

[0018] Consideration may be given to pre-tightening at least one locking element toward at least one recess. With the locking element pre-tightened toward at least one recess, when the second hollow profile moves relative to the first hollow profile, if the locking element does not actively overcome the pre-tightening movement, the locking element automatically engages in the next recess. This ensures that the mechanical lifting column does not unintentionally move to the retracted position, thereby ensuring reliable operation of the mechanical lifting column.

[0019] Improvedly, at least one locking element is connected to an actuating mechanism. The actuating mechanism moves the at least one locking element from a first position to a second position. In the first position, the locking element engages in a recess. In the second position, the locking element is not engaged in the recess. Preferably, the actuating mechanism has a Bowden line. The actuating mechanism allows the locking element to be released from or engaged in the recess. Here, the actuating mechanism can be positioned in an easily accessible location, for example, a lever operable by hand or foot. This simplifies the operation of the mechanical lifting column.

[0020] Alternatively, the preload of at least one spring element can be adjusted via an adjustment mechanism. Preferably, the adjustment mechanism changes the preload of at least one spring element via a servo motor. By adjusting the preload of the spring element, a supporting force that resists the force applied to the mechanical lifting column can be set. This allows the preload to be precisely set according to the desired load of the mechanical lifting column. The adjustment mechanism can be configured, for example, as a screw thread, which can be adjusted externally using a tool. Alternatively, the screw thread can be adjusted electrically.

[0021] Improvedly, the mechanical lifting column includes a force sensor that determines the force applied to the mechanical lifting column. By determining the applied force, it can be ensured that the force applied to the mechanical lifting column does not excessively exceed or fall below the preload of the second hollow profile relative to the first hollow profile in the direction of the extended position. It is conceivable that the force sensor would issue an acoustic or optical warning signal in the event of exceeding or falling below the preload.

[0022] A second aspect of the invention relates to an operating table. The operating table according to the invention has a base, a tabletop, and the aforementioned mechanical lifting column according to the invention. A first hollow profile of the mechanical lifting column is connected to the base, and a second hollow profile of the mechanical lifting column is connected to the tabletop. Preferably, at least one rolling element is arranged on the base. It is also conceivable that at least one rolling element has a braking mechanism. The operating table can be adjusted to a desired height using the mechanical lifting column according to the invention, without the need for a complex hydraulic system or electrical setting device. The spring element of the mechanical lifting column can be set or selected according to the patient's weight, such that the preload of the second hollow profile relative to the first hollow profile in the direction of the extended position corresponds to the force applied by the patient's weight. Thus, the operating table can be manually adjusted in height with minimal effort. Such an operating table can be manufactured cost-effectively and is also flexible in use.

[0023] A third aspect of the invention relates to a bollard assembly comprising a mechanical bollard according to the invention and at least one additional spring element. The spring constant of the at least one additional spring element differs from the spring constant of the at least one spring element of the mechanical bollard. The at least one spring element can be replaced by the at least one additional spring element. The preload of the second hollow profile relative to the first hollow profile in the direction of the extended position can be changed by the spring element and the at least one additional spring element. Therefore, the spring element can be replaced according to the expected force on the mechanical bollard. This ensures simple operation of the mechanical bollard regardless of the forces acting on it. Attached Figure Description

[0024] The invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. These are illustrated schematically: Figure 1 A cross-sectional view of the mechanical lifting column in the retracted position is shown; Figure 2 A cross-sectional view of the mechanical lifting column in the extended position is shown; Figure 3 A perspective view of the mechanical lifting column in the retracted position is shown; Figure 4 A perspective view of the mechanical lifting column in the extended position is shown; Figure 5A A side view of an operating table having a mechanical lifting column according to the invention is shown; Figure 5B A cross-sectional view of an operating table having a mechanical lifting column according to the invention is shown; Figure 6 It shows Figure 5B The diagram shows a detailed view of the mechanical structure. Detailed Implementation

[0025] exist Figure 1 and Figure 2 The mechanical lifting column 1 according to the invention is shown in the retracted position. Figure 1 ) and the extended position ( Figure 2 A cross-sectional view of the mechanical lifting column 1. The mechanical lifting column 1 includes a first hollow profile 2 and a second hollow profile 3. The first hollow profile 2 extends along a first longitudinal direction L1. The second hollow profile 3 extends along a second longitudinal direction L2. The first hollow profile 2 is arranged within the second hollow profile 3 such that the longitudinal directions L1 of the first hollow profile 2 and L2 of the second hollow profile 3 extend in the same, i.e., vertical direction. The second hollow profile 3 can be telescopically moved from a retracted position to an extended position relative to the first hollow profile 2.

[0026] In this embodiment, the first hollow profile 2 and the second hollow profile 3 are implemented as extruded profiles. Alternatively, welded structures or plates screwed together may also be considered, for example. The first hollow profile 2 and the second hollow profile 3 may be made, for example, at least partially, of metal, preferably aluminum; plastic or composite material.

[0027] The first support portion 7 is connected to the first hollow profile 2 such that the first hollow profile 2 is partially covered at one end. The second support portion 8 is connected to the second hollow profile 3 such that the second hollow profile 3 is partially covered at one end. As shown, the first support portion 7 and the second support portion 8 cover the respective upward-pointing ends of the hollow profiles 2 and 3 in the figure. The guide portion 10, which is configured as a tube, extends vertically from the second support portion 8 into the interior of the second hollow profile 3 such that the longitudinal direction of the guide portion 10 corresponds to the longitudinal directions L1 and L2 of the first hollow profile 2 and the second hollow profile 3. By arranging the first hollow profile 2 in the second hollow profile 3, the guide portion 10 also extends into the interior of the first hollow profile 2. One end of the guide portion 10 is connected to the second support portion 8 here. A third support portion 11 is arranged at the end of the guide portion 10 that is opposite to the second support portion 8 in the longitudinal direction.

[0028] The spring element 4, configured as a tension spring, is arranged between the first support 7 and the third support 11 such that the spring element preloads the second hollow profile 3 relative to the first hollow profile 2 in the direction of its extended position. In other words, the spring element 4... Figure 1 The maximum offset is shown in the retraction position and in Figure 2 The extended position shown is largely compressed.

[0029] Spring element 4 can be replaced by another spring element having a different spring constant than spring element 4. Because spring element 4 has a different spring constant than the other spring element, the preload of the second hollow profile 3 relative to the first hollow profile 2 in the direction of the extended position can be adjusted as needed. The mechanical lifting column 1 may have a force sensor that measures the force applied to it. Thus, spring element 4 or another spring element can be selected by the force applied to the mechanical column.

[0030] The maximum offset of the spring element 4 can be adjusted or set via the adjustment mechanism 22. Here, the adjustment mechanism 22 is configured as a screw thread. For example, the maximum offset of the spring element 4 can be shortened or lengthened from the outside using a tool. Alternatively, a servo motor can be considered, which is capable of electrically setting the maximum offset of the spring element 4.

[0031] The mechanical lifting column 1 also has a lever assembly 5. For this purpose, an angle bar 12 is arranged on the first support 7, the angle bar having a first leg 14 and a second leg 15, extending from a pivot point 13. The pivot point 13 is rotatably supported on the first support 7 about a rotation axis A. A first connecting rod 16 is connected to the second support 8 at its first end 16a and to the second leg 15 at its second end 16b. The first end 16a of the first connecting rod 16 is rotatably supported on the second support 8 about a rotation axis B. The second end 16b of the first connecting rod 16 is rotatably supported on the end of the second leg 15 opposite to the pivot point 13 about a rotation axis C.

[0032] The second connecting rod 17 is connected to the third support portion 11 at its third end 17a and to the first leg 14 at its fourth end 17b. The third end 17a of the second connecting rod 17 is rotatably supported on the third support portion 11 about the rotation axis E. The fourth end 17b of the second connecting rod 17 is rotatably supported on the end of the first leg 14 opposite to the rotation point 13 about the rotation axis D.

[0033] In other words, the second support part 8 is connected to the second leg 15 of the corner rod 12 via the first connecting rod 16, and the second connecting rod 17 is connected to the third support part 11 and the first leg 14 of the corner rod 12.

[0034] The angle rod 12, the first connecting rod 16, and the second connecting rod 17 form the lever assembly 5.

[0035] The first spring 4 pre-tensions the second hollow profile 3 to the extended position, and the spring element 4 causes the third support 11 to move toward the first support 7, thereby causing the second hollow profile 3 to move in the same direction as the spring element 4 via the lever assembly 5. Therefore, during the movement of the second hollow profile 3 from the retracted position to the extended position, the third support 11 moves vertically within the first hollow profile 2.

[0036] A rotatably supported roller 18 is arranged on the third support portion 11, and the roller contacts the inner surface 2a of the first hollow profile 2. During the entire movement of the second hollow profile 3 from the retracted position to the extended position and back, the rotatably supported roller 18 contacts the inner surface 2a. The rotatably supported roller 18 supports the force acting orthogonally to the vertical direction on the second hollow profile 3 relative to the first hollow profile 2. This ensures the smallest possible movement of the second hollow profile 3 relative to the first hollow profile 2, orthogonal to the vertical direction.

[0037] exist Figure 1 and Figure 2 The cross-sectional view shows the angle bar 12, the first connecting rod 16, the second connecting rod 17, and the roller 18, which is mounted on the third support 11 and rotatably supported. However, in this embodiment, the mechanical lifting column 1 shown has an additional lever assembly 5 symmetrically arranged about the vertical midline point of the first hollow profile 2 and the second hollow profile 3. This additional lever assembly has the angle bar 12, the first connecting rod 16, the second connecting rod 17, and the second roller 18, which are rotatably supported. They are connected to the first support 7, the second support 8, and the third support 11 in a manner similar to that described above. The two rotatably supported rollers 18 contact the inner surface 2a of the first hollow profile 2 on opposite sides of the first hollow profile 2.

[0038] It is possible to preload the rotatably supported roller 18 relative to the inner surface 2a of the first hollow profile 2. The deformation of the roller 18 due to this preload generates resistance that prevents movement of the second hollow profile 3 relative to the first hollow profile 2. Alternatively, the kinematics of the lever assembly 5 can be designed such that the preload of the rotatably supported roller 18 relative to the inner surface 2a gradually decreases from the retracted position to the extended position. Thus, the resistance of the rotatably supported roller 18 to the movement of the second hollow profile 3 relative to the first hollow profile 2 decreases proportionally to the preload of the second hollow profile 3 relative to the first hollow profile 2 via the spring element 4. In this case, the preloaded and rotatably supported roller 18 constitutes the retaining mechanism 6.

[0039] exist Figure 3 The image shows a perspective view of the mechanical lifting column 1 in the retracted position, while... Figure 4The figure shows a perspective view of the mechanical lifting column 1 in the extended position.

[0040] As from Figure 3 It is found that the second support portion 8 is connected to the end of the second hollow profile 3 and partially covers the second hollow profile 3. Here, the second support portion 8 is connected to the second hollow profile 3 via a fastener, which is implemented as a screw. Alternatively, the connection can be made by another fastener, such as a weld or adhesive between the second hollow profile 3 and the second support portion 8.

[0041] exist Figure 4 The diagram shows the mechanical lifting column 1 in the extended position. Here, the second hollow profile 3 moves vertically relative to the first hollow profile 2. The first hollow profile 2 and the second hollow profile 3 have various openings, for example, that allow external access to the first hollow profile 2 and the second hollow profile 3 to install components arranged in or on the first hollow profile 2 and the second hollow profile 3.

[0042] To enable the second hollow profile 3 to move with the lowest possible friction relative to the first hollow profile 2, at least one sliding plate is arranged between the outer surface 2b of the first hollow profile 2 and the inner surface 3a of the second hollow profile 3. Here, at least one sliding plate is either connected to the first hollow profile 2 or to the second hollow profile 3 and contacts the corresponding other of the first hollow profile 2 and the second hollow profile 3. The contact surface of at least one sliding plate preferably has a low coefficient of friction. The sliding plate may be at least partially made of plastic, such as POM, PA, or PTFE. Alternatively, the sliding plate may be formed from a coating of the first hollow profile 2 and / or the second hollow profile 3.

[0043] exist Figure 5A The image shows a side view of an operating table 30 having a mechanical lifting column 1 according to the invention. Figure 5B It shows Figure 5A A cross-sectional view of the operating table 30. The mechanical lifting column 1 is connected to the base 31 at the first hollow profile 2. The tabletop 33 of the operating table 30, shown only schematically, is arranged at the second hollow profile 3. Four rolling elements 32 are arranged at the base 31. At least two rolling elements 32, preferably four, are rotatably connected to the base 31 about a vertical axis, thereby enabling the mechanical lifting column 1 to move on the rolling elements 32 in different directions. It is conceivable that the rolling elements 32 also have a braking device, by which the movement of the rolling elements 32 can be releasably stopped.

[0044] The first hollow profile 2 has recesses 20 stacked in the direction L1 on one side wall. The second hollow profile 3 has a locking element 21 on the corresponding side wall, which can be releasably engaged with a corresponding recess 20 of the first hollow profile 2. By stacking the recesses 20 in the vertical direction, the second hollow profile 3 can be secured relative to the first hollow profile 2 in different extended positions. The recesses 20 and the locking element 21 constitute a retaining mechanism 6.

[0045] exist Figure 6 The mechanical lifting column 1 is shown in the figure. Figure 5B The diagram shows a detailed view of the retaining mechanism 6. The locking element 21 engages with a recess 20 and is shaped to correspond to the shape of the recess 20. Here, the recess 20 is, for example, a hole, into which the locking element 21 is bolted. Preferably, the locking element 21 and the recess 20 are constructed such that the locking element 21 can only be released from the recess 20 when a defined force threshold is reached on the mechanical lifting column 1. This limitation can be achieved, for example, by tilting the locking element 21 when the applied force differs from the defined force threshold. This prevents the mechanical lifting column 1 from moving too quickly from the extended position to the retracted position when the applied force is too large, or from moving too quickly from the retracted position to the extended position due to pre-tension when the applied force is too small, during the release of the retaining mechanism 6. This limitation on the releasability of the locking element 21 serves, for example, to ensure the safety of personnel on the operating table 30 and those in the surrounding area.

[0046] Preferably, the locking element 21 is pre-tightened toward the recess 20. Thus, when the second hollow profile 3 moves relative to the first hollow profile 2, the locking element 21 engages in the next recess 20 unless the pre-tightened locking element 21 is actively overcome. It is also conceivable that the locking element 21 can be released from engagement in the recess 20 via an actuating mechanism, such as a Bowden wire. Alternatively, actuation via a lever or electric actuator is also conceivable. Thus, the locking element 21 can, for example, be arranged within the mechanical lifting column 1 and operated externally. The actuating mechanism can here, for example, be arranged on the base 31 in the form of a lever operable by foot. Alternatively, the actuating mechanism can also be arranged on the table in the form of a lever operable by hand.

[0047] List of reference numerals 1 Mechanical rising bollard 2. First hollow profile 2a Inner Surface 2b outer surface 3 Second hollow profile 4 Spring Elements 5-Lever Component 6. Maintain mechanical structure 7 First Support Section 8 Second Support Section 9 openings 10 Guiding Department 11 Third Support Section 12-corner pole 13 turning points 14 First Leg 15 Second leg 16 First connecting rod 16a First end 16b second end 17 Second connecting rod 17a Third end 17b Fourth end 18 rollers 20 recesses 21 locking components 22 regulating mechanisms 30 operating tables 31 base 32 rolling elements 33 countertops A. First rotation axis B Second Rotation Axis C Third Rotation Axis D Fourth Rotation Axis E Fifth Rotation Axis L1 First longitudinal direction L2 Second longitudinal direction

Claims

1. A mechanical lifting column (1), the mechanical lifting column having a first hollow profile (2), a second hollow profile (3), a spring element (4), at least one lever assembly (5) and a retaining mechanical structure (6); in, The first hollow profile (2) extends along a first longitudinal direction (L1), and the second hollow profile (3) extends along a second longitudinal direction (L2). Wherein, the first longitudinal direction (L1) of the first hollow profile (2) and the second longitudinal direction (L2) of the second hollow profile (3) extend in the same, preferably vertical direction. The second hollow profile (3) is retractable from a retracted position to an extended position, in which the first hollow profile (2) is substantially completely arranged in the second hollow profile (3), and in the extended position, the first hollow profile (2) is only partially arranged in the second hollow profile (3). The at least one spring element (4) is connected to the first hollow profile (2) and the second hollow profile (3), such that the second hollow profile (3) is pre-tensioned relative to the first hollow profile (2) in the direction of the extended position. The lever assembly (5) is arranged inside the first hollow profile (2) and connects the first hollow profile (2) and the second hollow profile (3). The retaining mechanical structure (6) is configured to releasably prevent the movement of the second hollow profile (3) relative to the first hollow profile (2).

2. The mechanical lifting column (1) according to claim 1, characterized in that, The mechanical lifting column (1) has a first support portion (7), which is connected to and preferably at least partially covers the first hollow profile (2). The mechanical lifting column (1) has a second support (8), which is connected to the second hollow profile (3) and preferably at least partially covers the second hollow profile (3). The first support part (7) has an opening (9). A guide portion (10) is arranged on the side of the second support portion (8) facing the first hollow profile (2), wherein the guide portion (10) extends into the first hollow profile (2) through the opening (9) of the first support portion (7), wherein a third support portion (11) is arranged on the end of the guide portion (10) opposite to the second support portion (8), wherein at least one spring element (4) is connected to the first support portion (7) and the third support portion (11).

3. The mechanical lifting column (1) according to claim 2, characterized in that, The first support portion (7) is arranged on the end of the first hollow profile (2) facing the second hollow profile (3), and / or the second support portion (8) is arranged on the end of the second hollow profile (3) away from the first hollow profile (2).

4. The mechanical lifting column (1) according to any one of the preceding claims, characterized in that, The lever assembly (5) has at least one corner rod (12), at least one first connecting rod (16) and at least one second connecting rod (17). The corner rod (12) has a rotation point (13), a first leg (14), and a second leg (15), wherein the first leg (14) and the second leg (15) extend from the rotation point (13), and the rotation point (13) is rotatably arranged on the first hollow profile (2) around a first rotation axis (A). The first connecting rod (16) has a first end (16a) and a second end (16b), wherein the first end (16a) is rotatably arranged on the second hollow profile (3) about a second rotation axis (B), and wherein the second end (16b) is rotatably connected to the end of the first leg (14) away from the rotation point (13) about a third rotation axis (C). The second connecting rod (17) has a third end (17a) and a fourth end (17b), wherein the third end (17a) is rotatably connected to the end of the first leg (14) away from the rotation point (13) about a fourth rotation axis (D), and wherein the fourth end (17b) has a roller (18) rotatably supported about a fifth rotation axis (E), wherein the rotatably supported roller (18) contacts the inner surface (2a) of the first hollow profile (2) and is rotatably connected to the third support (11) about the fifth rotation axis (E).

5. The mechanical lifting column (1) according to claim 4, wherein, The rotatably supported roller (18) applies a clamping force to the inner surface (2a) of the first hollow profile (2), wherein the rotatably supported roller (18) is preferably rotatably supported on the third support (11).

6. The mechanical lifting column (1) according to any one of the preceding claims, wherein, At least one sliding plate is arranged between the outer surface (2b) of the first hollow profile (2) and the inner surface (3a) of the second hollow profile (3).

7. The mechanical lifting column (1) according to any one of the preceding claims, wherein, The first hollow profile (2) or the second hollow profile (3) has at least one recess (20), and The retaining mechanism (6) includes at least one locking element (21) arranged on another of the first hollow profile (2) or the second hollow profile (3) and releasably engaged in at least one recess (20) of the first hollow profile (2) or the second hollow profile (3).

8. The mechanical lifting column (1) according to claim 7, wherein, The at least one recess (20) and the at least one locking element (21) have corresponding geometries that prevent at least one locking element (21) from being released from at least one recess (20) unless the force applied to the mechanical lifting column (1) along the second longitudinal direction of the second hollow profile (3) exceeds a defined force threshold.

9. The mechanical lifting column (1) according to claim 7 or 8, wherein, The at least one locking element (21) is pre-tightened in the direction toward the at least one recess (20).

10. The mechanical lifting column (1) according to any one of claims 7 to 9, wherein, The at least one locking element (21) is connected to an actuating mechanism, and the actuating mechanism enables the at least one locking element (21) to move from a first position to a second position, in the first position the locking element (21) engages in a recess (20), and in the second position the locking element (21) is not engaged in a recess (20), wherein the actuating mechanism preferably has Bowden lines.

11. The mechanical lifting column (1) according to any one of the preceding claims, wherein, The preload of the at least one spring element (4) can be adjusted by the adjustment mechanism (22).

12. The mechanical lifting column (1) according to claim 11. in, The adjustment mechanism (22) changes the preload of the at least one spring element (4) via a servo motor.

13. The mechanical lifting column (1) according to any one of the preceding claims, wherein, The mechanical lifting column (1) also has a force sensor that determines the force applied to the mechanical lifting column (1).

14. An operating table (30), said operating table having: Base (31) Countertop (33) And the mechanical lifting column (1) according to any one of the preceding claims, wherein, The first hollow profile (2) is connected to the base (31) and the second hollow profile (3) is connected to the tabletop.

15. A bollard assembly, the bollard assembly comprising: The mechanical lifting column (1) according to any one of claims 1 to 13, and At least one additional spring element, Its features are, The spring constant of the at least one additional spring element is different from the spring constant of at least one spring element (4) of the mechanical lifting column (1), and the at least one spring element (4) can be replaced by at least one additional spring element.

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