Mechanical lifting column, operating table with such a mechanical lifting column and lifting column kit

Abstract

A mechanical lifting column 1 comprising a first hollow profile 2, a second hollow profile 3, a spring element 4, at least one lever arrangement 5, and a holding mechanism 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 in a common, preferably vertical, direction. The second hollow profile 3 is telescopically displaceable from a retracted position, in which the first hollow profile 2 is substantially completely arranged within the second hollow profile 3, to an extended position, in which the first hollow profile 2 is only partially arranged within 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 mechanism 6 is designed to releasably prevent the movement of the second hollow profile 3 relative to the first hollow profile 2.

Description

[0001] The present invention relates to a mechanical lifting column. Furthermore, the present invention relates to an operating table comprising such a mechanical lifting column, and to a lifting column kit.

[0002] Lifting columns are known from the prior art and are mostly used in operating tables or desks to provide height adjustment of the operating table's surface. Depending on the expected load in the application, the height adjustment is usually achieved by a hydraulic system and / or an electric drive. Such a hydraulic lifting column is known, for example, from EP 3 646 841 A1. While such adjustment mechanisms are readily suitable for adjusting the height of an operating table's surface, they are complex and often expensive. Furthermore, a mechanical solution for adjusting the height of a piece of furniture is known from EP 2 873 344 A1.

[0003] Furthermore, regular maintenance of the lifting column is required for operating tables to ensure their proper functioning and the safety of patients on the operating tables at all times.

[0004] If the lifting columns are electrically adjustable, a mains connection or an integrated battery is always required for operation, which limits the location or duration of use of the lifting column.

[0005] It is therefore an object of the present invention to provide a lifting column which is cost-effective and can be used flexibly.

[0006] The problem is solved with a mechanical lifting column according to claim 1. Advantageous further developments are described in the dependent claims.

[0007] According to a first aspect, the present invention relates to a mechanical lifting column comprising a first hollow profile, a second hollow profile, a spring element, at least one lever arrangement, and a holding mechanism. The first hollow profile extends in a first longitudinal direction, and the second hollow profile extends in 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 an identical, preferably vertical, direction. The second hollow profile is telescopically displaceable from a retracted position, in which the first hollow profile is substantially completely arranged within the second hollow profile, to an extended position, in which the first hollow profile is only partially arranged 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 pre-tensioned relative to the first hollow profile in the direction of its extended position. The lever assembly is located inside the first hollow profile and connects the first and second hollow profiles. The retaining mechanism is designed to prevent the movement of the second hollow profile relative to the first hollow profile in a releasable manner.

[0008] The preload of the second hollow profile relative to the first hollow profile in the direction of the extended position counteracts the force applied to the mechanical lifting column. This allows the mechanical lifting column to be moved manually from the retracted to the extended position without the operator having to overcome the entire force applied to the mechanical lifting column. The locking mechanism also allows the mechanical lifting column to be locked in a desired position.

[0009] This provides a lifting column that is purely mechanically adjustable and can be manufactured cost-effectively. Furthermore, the mechanical lifting column is low-wear and can be used flexibly, especially without the need for a power supply.

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

[0011] Preferably, the lever arrangement comprises at least one angle lever, at least one first connecting lever, and at least one second connecting lever. The angle lever 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 mounted on the first hollow profile about a first axis of rotation. The first connecting lever has a first end and a second end. The first end is rotatably mounted on the second hollow profile about a second axis of rotation. The second end is rotatably connected to an end of the first leg located away from the pivot point about a third axis of rotation. The second connecting lever has a third end and a fourth end. The third end is rotatably connected to an end of the first leg located away from the pivot point about a fourth axis of rotation.The fourth end has a roller rotatably mounted about a fifth axis of rotation, which contacts the inner surface of the first hollow profile and is rotatably connected to the third support about the fifth axis of rotation.

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

[0013] The connection between the first and second hollow profiles via the lever arrangement ensures that the second hollow profile does not tilt relative to the first when moved, particularly when a moment is applied to it. The roller(s) 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. In other words, the lever arrangement(s) serve to guide the second hollow profile securely relative to the first hollow profile under different forces acting on the mechanical lifting column.

[0014] Furthermore, it is conceivable that the rotatably mounted roller exerts a contact pressure on the inner surface of the first hollow profile, with the rotatably mounted roller preferably being rotatably mounted on the third support. The contact pressure of the rotatably mounted roller on the inner surface generates resistance that opposes the movement of the second hollow profile relative to the first hollow profile. The mechanical lifting column can only be moved once this resistance has been overcome. In other words, the resistance slows the movement of the mechanical lifting column to prevent unwanted or excessively rapid movements.

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

[0016] It is conceivable that the first or second hollow profile has at least one recess and that the holding mechanism includes at least one locking element. The locking element is arranged on the other side of the first or second hollow profile and engages releasably in the at least one recess of the first or second hollow profile. Such a locking element allows the second hollow profile to be securely fixed relative to the first hollow profile. Displacement of the mechanical lifting column is then prevented, regardless of the applied force.

[0017] It is advantageous if the at least one recess and the at least one locking element have corresponding geometries that prevent the at least one locking element from disengaging from the at least one recess if a force applied to the mechanical lifting column in the second longitudinal direction of the second hollow profile exceeds a defined force threshold. Such a design of the locking element and the recesses prevents the locking element from being removed from the recess if the applied force is too great, thus preventing the mechanical lifting column from being moved too quickly into the retracted position. At the same time, it prevents the locking element from being disengaged if the applied force is too low, thus preventing the mechanical lifting column from being moved too quickly into the extended position due to the preload of the second hollow profile relative to the first hollow profile.This prevents damage to the mechanical lifting column and ensures safe operation.

[0018] It is conceivable that at least one locking element is pre-tensioned in the direction of at least one recess. With pre-tensioning of the locking element in the direction of at least one recess, the locking element automatically engages in the next recess when the second hollow profile is moved relative to the first hollow profile, unless the locking element is actively moved against the pre-tension. This ensures that the mechanical lifting column does not move unintentionally into the retracted position, thus guaranteeing the safe operation of the mechanical lifting column.

[0019] In this further development, at least one locking element is connected to an actuating mechanism. The actuating mechanism can move the at least one locking element from a first position to a second position. In the first position, the locking element engages in the recess. In the second position, the locking element does not engage in the recess. Preferably, the actuating mechanism comprises a Bowden cable. The actuating mechanism can release the locking element from the recess or engage it. The actuating mechanism can, for example, be arranged in an easily accessible location. A lever that can be operated by hand or foot is conceivable. This facilitates the operation of the mechanical lifting column.

[0020] It is also conceivable that the preload of the at least one spring element can be adjusted by an adjustment mechanism. Preferably, the adjustment mechanism changes the preload of the at least one spring element by means of an actuator. By adjusting the preload of the spring element, the supporting force that counteracts a force applied to the mechanical lifting column can be set. This allows for precise adjustment of the preload according to an expected load on the mechanical lifting column. The adjustment mechanism is, for example, designed as a turnbuckle that can be adjusted externally by a tool. Alternatively, the turnbuckle can also be adjusted electrically.

[0021] Furthermore, the mechanical lifting column features a force sensor that detects the force applied to it. By measuring this force, it can be ensured that the force applied to the mechanical lifting column does not significantly 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 could emit an audible or visual warning signal if the preload is exceeded or falls below the limit.

[0022] A second aspect of the present invention relates to an operating table. The operating table according to the invention comprises a base, a lying surface, and a mechanical lifting column as described above. The first hollow profile of the mechanical lifting column is connected to the base, and the second hollow profile of the mechanical lifting column is connected to the lying surface. Preferably, at least one roller element is arranged on the base. It is also conceivable that the at least one roller element has a braking mechanism. By means of the mechanical lifting column according to the invention, the operating table can be adjusted to the desired height without the need for a complex hydraulic or electrical adjustment device.The spring element of the mechanical lifting column can be adjusted or selected according to the patient's weight, so that the preload of the second hollow profile relative to the first hollow profile in the extended position corresponds to the force exerted by the patient's weight. The operating table can then be manually adjusted in height with minimal effort. Such an operating table is inexpensive to manufacture and, moreover, offers flexible application.

[0023] A third aspect of the present invention relates to a lifting column kit comprising a mechanical lifting column according to the invention and at least one further spring element. The spring constant of the at least one further spring element differs from the spring constant of the at least one spring element of the mechanical lifting column. The at least one spring element is replaceable by the at least one further spring element. The spring element and the at least one further spring element allow the preload of the second hollow profile relative to the first hollow profile to be changed in the direction of the extended position. Thus, it is possible to exchange the spring element according to the expected force on the mechanical lifting column. This ensures easy operation of the mechanical lifting column at all times, even under varying forces acting on it.

[0024] The invention will now be explained in more detail with reference to the embodiments shown in the figures. The figures schematically show: Fig. 1 a sectional view of a mechanical lifting column in a retracted position; Fig. 2 a sectional view of the mechanical lifting column in an extended position; Fig. 3 a perspective view of the mechanical lifting column in a retracted position; Fig. 4 a perspective view of the mechanical lifting column in an extended position; Fig. 5A a side view of an operating table with a mechanical lifting column according to the invention; Fig. 5B a sectional view of the operating table with a mechanical lifting column according to the invention; and Fig. 6 a detailed view of one in Fig. Holding mechanism shown in 5B.

[0025] In the Fig. 1 and Fig. Figure 2 shows sectional views of a mechanical lifting column 1 according to the invention in a retracted position ( Fig. 1) and an extended position ( Fig. 2) shown. The mechanical lifting column 1 comprises a first hollow profile 2 and a second hollow profile 3. The first hollow profile 2 extends in a first longitudinal direction L1. The second hollow profile 3 extends in a second longitudinal direction L2. The first hollow profile 2 is arranged within the second hollow profile 3 such that the longitudinal direction L1 of the first hollow profile 2 and the longitudinal direction L2 of the second hollow profile 3 extend in an identical, namely vertical, direction. The second hollow profile 3 is telescopically displaceable relative to the first hollow profile 2 from the retracted position to the extended position.

[0026] In the present embodiment, the first hollow profile 2 and the second hollow profile 3 are designed as extruded profiles. Alternatively, a welded construction or plates bolted together are also conceivable. The first hollow profile 2 and the second hollow profile 3 can, for example, consist at least partially of metal, preferably aluminum, plastic, or composite materials.

[0027] A first support 7 is connected to the first hollow profile 2 such that the first hollow profile 2 is partially covered at one end. A second support 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 7 and the second support 8 cover the upward-facing end of the respective hollow profile 2, 3 in the figures. A guide 10, which in this case is designed as a tube, extends vertically from the second support 8 into the interior of the second hollow profile 3 such that the longitudinal direction of the guide 10 corresponds to the longitudinal directions L1, L2 of the first hollow profile 2 and the second hollow profile 3. Due to the arrangement of the first hollow profile 2 within the second hollow profile 3, the guide 10 also extends into the interior of the first hollow profile 2. One end of the guide 10 is connected to the second support 8.A third support 11 is arranged at the end of the guide 10 opposite the second support 8 in the longitudinal direction.

[0028] A spring element 4, designed as a tension spring, is arranged between the first support 7 and the third support 11 such that it pre-tensions the second hollow profile 3 relative to the first hollow profile 2 in the direction of the extended position. In other words, the spring element 4 is in the Fig. 1 shown in the retracted position, largely maximally deflected and in the Fig. 2 shown extended position largely compressed.

[0029] Spring element 4 can be replaced by another spring element with a spring constant that differs from that of spring element 4. Due to the different spring constants of spring element 4 and 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. It is conceivable that the mechanical lifting column 1 has a force sensor that measures the force applied to it. This would allow the selection of spring element 4 or the other spring element based on the force applied to the mechanical column.

[0030] The maximum deflection of the spring element 4 can be adjusted via an adjustment mechanism 22. In this case, the adjustment mechanism 22 is designed as a turnbuckle. The maximum deflection of the spring element 4 can be shortened or lengthened externally, for example, using a tool. Alternatively, it is conceivable to provide an actuator that allows for electrical adjustment of the maximum deflection of the spring element 4.

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

[0032] A second connecting lever 17 is connected at a third end 17a to the third support 11 and at a fourth end 17b to the first leg 14. The third end 17a of the second connecting lever 17 is rotatably mounted on the third support 11 about the axis of rotation E. The fourth end 17b of the second connecting lever 17 is rotatably mounted about an axis of rotation D on an end of the first leg 14 opposite the pivot point 13.

[0033] In other words, the second support 8 connects the second support 8 to the second leg 15 of the angle lever 12 via the first connecting lever 16, and the second connecting lever 17 connects the third support 11 to the first leg 14 of the angle lever 12.

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

[0035] The spring element 4 pre-tensions the second hollow profile 3 into an extended position such that the spring element 4 moves the third support 11 towards the first support 7, thereby also moving the second hollow profile 3 in the direction of the movement of the spring element 4 via the lever arrangement 5. The third support 11 thus moves vertically within the first hollow profile 2 from the retracted position to the extended position during the movement of the second hollow profile 3.

[0036] A rotatably mounted roller 18 is arranged at the third support 11 and contacts an inner surface 2a of the first hollow profile 2. The rotatably mounted roller 18 maintains contact with the inner surface 2a throughout the entire movement of the second hollow profile 3 from the retracted position to the extended position and vice versa. Forces acting orthogonally to the vertical direction on the second hollow profile 3 can be supported by the rotatably mounted roller 18 relative to the first hollow profile 2. This ensures minimal movement of the second hollow profile 3 relative to the first hollow profile 2 in the orthogonal direction.

[0037] In the Fig. 1 and Fig. Figure 2 shows, based on the sectional views, an angle lever 12, a first connecting lever 16, a second connecting lever 17, and a rotatably mounted roller 18 provided at the third support 11. However, in this embodiment, the illustrated mechanical lifting column 1 has a further lever arrangement 5, symmetrically positioned about a vertical central axis of the first hollow profile 2 and the second hollow profile 3, comprising an angle lever 12, a first connecting lever 16, a second connecting lever 17, and a second rotatably mounted roller 18. These are connected to the first support 7, the second support 8, and the third support 11 analogously to the structure described above. The two rotatably mounted 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 conceivable that the rotatably mounted rollers 18 are preloaded against the inner surface 2a of the first hollow profile 2. The deformation of the rollers 18 due to the preload can generate resistance that opposes the movement of the second hollow profile 3 relative to the first hollow profile 2. Furthermore, it is conceivable that the kinematics of the lever arrangements 5 are designed such that the preload of the rotatably mounted rollers 18 against the inner surface 2a decreases from the retracted position to the extended position. This reduces the resistance of the rotatably mounted rollers 18 to movement of the second hollow profile 3 relative to the first hollow profile 2 proportionally to the preload of the second hollow profile 3 relative to the first hollow profile 2 exerted by the spring element 4. In such a case, the preloaded and rotatably mounted rollers 18 constitute a holding mechanism 6.

[0039] In Fig. Figure 3 shows a perspective view of the mechanical lifting column 1 in the retracted position, while in Fig. Figure 4 shows a perspective view of the mechanical lifting column 1 in the extended position.

[0040] As from Fig. As can be seen from Figure 3, the second support 8 is connected to one end of the second hollow profile 3 and partially covers the second hollow profile 3. The second support 8 is connected to the second hollow profile 3 by fasteners, which in this case are designed as screws. Alternatively, a connection by another fastener would also be conceivable, for example a weld or an adhesive bond between the second hollow profile 3 and the second support 8.

[0041] In Fig. Figure 4 shows the mechanical lifting column 1 in its extended position. The second hollow profile 3 is shifted vertically relative to the first hollow profile 2. The first hollow profile 2 and the second hollow profile 3 have various openings which, for example, allow external access to the first hollow profile 2 and the second hollow profile 3 for mounting components located in or on them.

[0042] To enable the second hollow profile 3 to move with minimal friction relative to the first hollow profile 2, at least one sliding plate is arranged between an outer surface 2b of the first hollow profile 2 and an inner surface 3a of the second hollow profile 3. The at least one sliding plate is connected either to the first hollow profile 2 or to the second hollow profile 3 and contacts the other surface of the first hollow profile 2 and the second hollow profile 3, respectively. The contact surface of the at least one sliding plate preferably has a low coefficient of friction. The sliding plate can be made at least partially of plastic, such as POM, PA, or PTFE. It is also conceivable that the sliding plate is formed by a coating on the first hollow profile 2 and / or the second hollow profile 3.

[0043] In the Fig. Figure 5A shows a side view of an operating table 30 with a mechanical lifting column 1 according to the invention. Fig. Figure 5B shows a sectional view of operating table 30. Fig. 5A. The mechanical lifting column 1 is connected to a base 31 on the first hollow profile 2. A lying surface 33 of the operating table 30, shown only schematically, is arranged on the second hollow profile 3. Four roller elements 32 are arranged on the base 31. At least two roller elements 32, preferably four roller elements 32, are rotatably connected to the base 31 about the vertical axis, so that the mechanical lifting column 1 can be moved on the roller elements 32 in different directions. It is conceivable that the roller elements 32 also have a braking device with which the movement of the roller elements 32 can be releasably prevented.

[0044] The first hollow profile 2 has recesses 20 arranged one above the other on a side wall in the direction L1. The second hollow profile 3 has a locking element 21 on a corresponding side wall, which can be detachably engaged in any one of the recesses 20 of the first hollow profile 2. Due to the vertical arrangement of the recesses 20 one above the other, the second hollow profile 3 can be fixed in various extended positions relative to the first hollow profile 2. The recesses 20 and the locking element 21 constitute a holding mechanism 6.

[0045] In the Fig. 6 is a detailed view of the in Fig.Figure 5B shows the holding mechanism 6 of the mechanical lifting column 1. The locking element 21 engages with a recess 20 and is shaped to correspond to the shape of the recesses 20. In this case, the recesses 20 are, for example, bores into which the locking element 21 engages in the form of a bolt. Preferably, the locking element 21 and the recesses 20 are designed such that the locking element 21 can only be released from a recess 20 up to a defined force threshold applied to the mechanical lifting column 1. Such a limitation can be implemented, for example, by tilting the locking element 21 when the applied force deviates 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 a large force is applied, or from being released too quickly when the holding mechanism 6 is released.If insufficient force is applied, the preload causes the locking element to move too quickly from the retracted position to the extended position. Limiting the release capability of the locking element 21 serves, for example, to ensure the safety of a person lying on the operating table 30's surface 33 and of the surrounding personnel.

[0046] Preferably, the locking element 21 is pre-tensioned in the direction of the recesses 20. This ensures that when the second hollow profile 3 is moved relative to the first hollow profile 2, the locking element 21 engages in the next recess 20, unless the locking element 21 is actively actuated against the pre-tension. It is also conceivable that the locking element 21 can be released from engagement in the recess 20 by means of an actuating mechanism, for example, a Bowden cable. Alternatively, actuation via a lever or an electric actuator would also be conceivable. This allows the locking element 21, for example, to be arranged within the mechanical lifting column 1 and operated externally. The actuating mechanism can, for example, be arranged at the base 31 in the form of a lever that can be operated with the foot. Alternatively, the actuating mechanism can also be arranged on the lying surface in the form of a lever that can be operated by hand. REFERENCE MARK LIST 1 Mechanical lifting column 2 First hollow profile 2a Inner surface 2b Outer surface 3 Second hollow profile 3a Inner surface 4 spring element 5 lever arrangement 6 Holding mechanism 7 First support 8 Second support 9 Opening 10 Leadership 11 Third support 12 angle levers 13 Pivot point 14 First thigh 15 Second thigh 16 First connecting lever 16a First End 16b Second End 17 Second connecting lever 17a Third End 17b Fourth End 18 rolls 20 Exclusion 21 Latching element 22 Adjustment mechanism 30 operating tables 31 Base 32 roller elements 33 sleeping area A First axis of rotation B Second axis of rotation C Third axis of rotation D Fourth axis of rotation E Fifth axis of rotation L1 First longitudinal direction L2 Second longitudinal direction

Claims

[1] Mechanical lifting column (1) with a first hollow profile (2), a second hollow profile (3), a spring element (4), at least one lever arrangement (5) and a holding mechanism (6); wherein the first hollow profile (2) extends in a first longitudinal direction (L1) and wherein the second hollow profile (3) extends in 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 an identical, preferably vertical, direction, wherein the second hollow profile (3) is telescopically displaceable from a retracted position, in which the first hollow profile (2) is substantially completely arranged in the second hollow profile (3), to an extended position, in which the first hollow profile (2) is only partially arranged in the second hollow profile (3), wherein 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, wherein the lever arrangement (5) is arranged within the first hollow profile (2) and the first hollow profile (2) and the second hollow profile (3) connects, wherein the holding mechanism (6) is designed to prevent the movement of the second hollow profile (3) relative to the first hollow profile (2) in a releasable manner. [2] Mechanical lifting column (1) according to claim 1, characterized by , that the mechanical lifting column (1) has a first support (7) which is connected to the first hollow profile (2) and preferably at least partially covers the first hollow profile (2), and 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), wherein the first support (7) has an opening (9), wherein a guide (10) is arranged on a side of the second support (8) facing the first hollow profile (2), wherein the guide (10) extends through the opening (9) of the first support (7) into the first hollow profile (2), wherein a third support (11) is arranged at the end of the guide (10) opposite the second support (8), wherein the at least one spring element (4) is connected to the first support (7) and the third support (11). [3] Mechanical lifting column (1) according to claim 2, characterized by, that the first support (7) is arranged at an end of the first hollow profile (2) facing the second hollow profile (3), and / or the second support (8) is arranged at an end of the second hollow profile (3) facing away from the first hollow profile (2). [4] Mechanical lifting column (1) according to any one of the preceding claims, characterized by , that the lever arrangement (5) comprises at least one angle lever (12), at least one first connecting lever (16) and at least one second connecting lever (17), wherein the angle lever (12) has a pivot point (13), a first leg (14) and a second leg (15), wherein the first leg (14) and the second leg (15) extend from the pivot point (13), wherein the pivot point (13) is rotatably arranged on the first hollow profile (2) about a first axis of rotation (A), wherein the first connecting lever (16) has a first end (16a) and a second end (16b), wherein the first end (16a) is rotatably arranged about a second axis of rotation (B) on the second hollow profile (3), and wherein the second end (16b) is rotatably connected about a third axis of rotation (C) to an end of the first leg (14) located away from the pivot point (13), wherein the second connecting lever (17) has a third end (17a) and a fourth end (17b), wherein the third end (17a) is rotatably connected to an end of the first leg (14) located away from the pivot point (13) about a fourth axis of rotation (D), and wherein the fourth end (17b) has a roller (18) rotatably mounted about a fifth axis of rotation (E), wherein the rotatably mounted roller (18) contacts an inner surface (2a) of the first hollow profile (2) and is rotatably connected about the fifth axis of rotation (E) to the third support (11). [5] Mechanical lifting column (1) according to claim 4, wherein the rotatably mounted roller (18) applies a contact pressure to the inner surface (2a) of the first hollow profile (2), wherein the rotatably mounted roller (18) is preferably rotatably mounted on the third support (11). [6] Mechanical lifting column (1) according to one of the preceding claims, wherein at least one sliding plate is arranged between an outer surface (2b) of the first hollow profile (2) and an inner surface (3a) of the second hollow profile (3). [7] Mechanical lifting column (1) according to 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 holding mechanism (6) comprises at least one locking element (21) which is arranged on the other side of the first hollow profile (2) or the second hollow profile (3), and into which at least one recess (20) of the first hollow profile (2) or the second hollow profile (3) engages detachably. [8] 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 the at least one locking element (21) from disengaging from the at least one recess (20) if a force applied to the mechanical lifting column (1) in the second longitudinal direction of the second hollow profile (3) exceeds a defined force threshold. [9] Mechanical lifting column (1) according to claim 7 or 8, wherein the at least one detent element (21) is pre-tensioned in the direction of the at least one recess (20). [10] Mechanical lifting column (1) according to any one of the preceding claims 7 to 9, wherein the at least one detent element (21) is connected to an actuating mechanism and the actuating mechanism can move the at least one detent element (21) from a first position in which the detent element (21) engages in the recess (20) to a second position in which the detent element (21) does not engage in the recess (20), wherein the actuating mechanism preferably comprises a Bowden cable. [11] Mechanical lifting column (1) according to one of the preceding claims, wherein the preload of the at least one spring element (4) can be adjusted by an adjusting mechanism (22). [12] Mechanical lifting column (1) according to claim 11, wherein the adjustment mechanism (22) changes the preload of the at least one spring element (4) by means of an actuator motor. [13] Mechanical lifting column (1) according to one of the preceding claims, wherein the mechanical lifting column (1) further comprises a force sensor which determines a force applied to the mechanical lifting column (1). [14] Operating table (30), comprising: a base (31), a lying area (33), and a mechanical lifting column (1) according to 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 lying surface. [15] Lifting column kit, comprising: a mechanical lifting column (1) according to any one of claims 1 to 13, and at least one more spring element, characterized by , that the spring constant of the at least one further spring element differs from the spring constant of the at least one spring element (4) of the mechanical lifting column (1) and the at least one spring element (4) can be replaced by the at least one further spring element.

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