EP3904269A1 - Hose lifter - Google Patents

Abstract

The invention relates to a tube lifter (2) comprising a lifting tube (4) which has a tube interior (12) and can be shortened by applying negative pressure to the tube interior (12), and with a suction gripping device arranged at one end of the lifting tube (4) (8), which can be supplied with negative pressure through the hose interior (12) for sucking in and lifting an object, and with an operating device (6), and with a holding device (20) for fixing the operating device (6) together with the suction gripping device (8) and of the lifting tube (4) in the shortened, contracted state of the lifting tube to prevent unintentional lowering or falling, the holding device (20) having two holding points (26) opposite one another with respect to the lifting tube (4) and the operating device (6), at which a load-bearing element (24) of the holding device (20) for fixing the operating device (6) together with the suction gripping device ( 8) and the lifting tube (4) can attack, wherein a dimensionally stable locking member (32) is present, which is in a load-bearing connection with the load-bearing element (24) and which is designed and arranged so that it has both holding points (26) at the same time can form a load-bearing fixing connection, and that the locking member (32) has two coupling areas (36, 38) for this purpose, which are arranged so that they can form the releasable fixing connection with the opposing holding points (26).

Description

The invention relates to a tube lifter comprising a lifting tube which has a tube interior and can be shortened by applying negative pressure to the tube interior, and with a suction gripping device arranged at one end of the lifting tube, which can be supplied with negative pressure through the tube interior for sucking and lifting an object is, and with an operating device that has a suction connection for flow connection with the suction gripping device, a lifting tube connection for flow connection with the inner space of the lifting tube and a valve device for controlling flow connections and a manually operated operating element, and with a holding device for fixing the operating device together Suction gripping device and the lifting tube in the shortened, collapsed state of the lifting tube to prevent unintentional lowering or falling, the holding device having two holding points which are opposite to one another with respect to the lifting tube and the operating device and at which a load-bearing element of the holding device for fixing the operating device together with the suction gripping device and the lifting tube engage can.

Such tube lifters are often arranged on crane arms with a longitudinally displaceable suspension and can then be grasped by an operator if necessary and used for sucking in, lifting and moving any object. When the tube lifter is not needed, the lifting tube is in a foreshortened condition and is typically contracted to its minimum length, which is referred to as "collapsed". If the application of negative pressure to the lifting tube is interrupted in this state, there is a risk that the lifting tube together with the operating device and suction gripping device will lower or even fall. It has therefore already been proposed to fix the tube lifter in this contracted state by means of a holding device. The holding device typically engages the operating device or the suction gripping device. In the prior art, a holding device is known for this, which comprises load-bearing elements in the form of belts, which extend down from above and which can be suspended by means of ring-shaped holding eyes at holding points of the operating device, which are formed by protruding bolts, in order to keep the tube lifter in the contracted position To fix the state of the lifting tube in a detachable manner. For this an operator has to use one hand Take one of the eyelets attached to the belt ends and guide it over the retaining bolt and then do the same on the opposite side. The release of this fixing position is equally complex, since the user has to reach around several times.

Based on this, the present invention is based on the object of simplifying the handling of the tube lifter during commissioning and decommissioning and, in particular, of shortening the set-up times for this. Regardless of this, however, operational safety should not be reduced, but rather increased.

Based on a tube lifter of the type mentioned, this object is achieved according to the invention in that there is a dimensionally stable locking member which is in a load-bearing connection with the load-bearing element and which is designed and arranged in such a way that it can form a load-bearing fixing connection with both holding points at the same time, and that the single locking member has two coupling areas for this purpose, which are arranged so that they can form the releasable fixing connection with the opposing holding points.

It is therefore proposed according to the invention, instead of two ring-shaped eyelets at a respective lower end of two straps, which have to be gripped with one or the other hand and brought into the operating position, a dimensionally stable and preferably rigid locking member which has both holding points at the same time grab and can enter into a load-bearing fixing connection with both breakpoints at the same time, so that a unintentional falling of the operating device with the suction gripping device attached to it can be prevented and the tube lifter can be brought into an operationally safe state in which the vacuum supply to the lifting tube can also be switched off.

If a dimensionally stable or rigid locking member is mentioned above, this does not exclude a certain flexibility, but it is meant with a dimensional stability that allows the locking member for both breakpoints to be brought into a fixation position with the breakpoints at the same time; the locking member is therefore in particular not formed from a flexible belt section. Nevertheless, the holding device, in particular its load-bearing element, can comprise a belt section or belt sections on which the dimensionally stable and preferably rigid locking member is held, which will be explained below. The fixation of the tube lifter is preferably effected by or by means of the single locking member at both holding points.

It has proven to be expedient and advantageous if the two coupling areas of the locking member and the two holding points are designed in such a way that the releasable fixing connection is a mechanical, form-fitting holding connection. In such a case, a detachable fixing connection is established in the tube lifter by means of the locking member by hooking, rear hooking or reaching under the holding points.

It proves to be advantageous here if the two coupling areas are designed in the shape of hooks, an open engagement area of the hook being arranged on an underside of the locking member. The locking member can thus be placed on the holding points, in particular due to the force of gravity, and can be brought into the fixing position simultaneously for both holding points by means of a short adjusting movement.

The breakpoints could in principle be formed by any areas that can be grasped or grasped from behind at a lower end of the lifting tube or at the operating device or at the suction gripping device. However, it also proves to be advantageous if the two holding points are formed by outwardly protruding bolts or pins, in particular with a free end with an enlarged diameter. In this way, a fixing connection can be established in a simple manner. The optionally provided free end with enlarged diameter serves as a safeguard against loss, so to prevent the locking member from sliding over the free end of the bolt or pin. However, this additional feature is unnecessary if the locking element is designed or the distance between the two coupling areas of the locking element is selected so close to one another that the coupling areas cannot slide over the extent of the bolts or pins.

In a preferred embodiment of the tube lifter, the dimensionally stable locking member is connected to the load-bearing element in a pivotable and / or floating manner. When the tube lifter is in operation, that is to say the lifting tube is elongated in relation to its contracted position in which it has moved to a block, the holding device is located with its Components, that is, preferably also with the dimensionally stable locking member, well above the operating device and the suction gripping device and is therefore annoying for an operator. The aforementioned pivotable or floating mounting of the locking member does not impair the mobility of the lifting tube.

As already mentioned, it can prove to be advantageous if the load-bearing element is an arrangement of vertically extending straps provided outside the lifting tube. As a result, the holding device does not interfere with the operability and, in particular, the mobility of the lifting tube. For example, two, three or four vertically extending belt sections, which are connected to one another by rigid, semi-rigid or flexible ring sections, preferably displaceably, form a net-like support structure which, however, does not impair the operability of the lifting tube.

In one embodiment, the load-bearing element of the holding device of the tube lifter can be held or releasably suspended on a crane arm that also carries the lifting tube, in particular on a running element of a crane arm.

If the load-bearing element is made of a pliable material, a connection with the dimensionally stable locking element can be established in a particularly simple manner, for example by having openings in the dimensionally stable locking element that form eyelets, in particular slot-shaped openings, which are also open-edged on one side can be provided. But it would also be conceivable and advantageous if between the load-bearing Element and the dimensionally stable locking member acting at points connecting means such as rings, shackles or the like are provided. In this way, too, a pivotable and / or floating arrangement of the rigid locking member on the load-bearing element of the holding device can be achieved in a simple manner.

According to a further idea of particular importance, it is proposed that the locking element be acted upon by an elastic element which pretensions the locking element towards a position with respect to the lifting tube or the load-bearing element. In this way, two things can be achieved: on the one hand, a defined position of the locking member is given in the released state of the holding device, that is, during operation of the tube lifter, so that the locking member does not swing around in an uncontrolled manner. On the other hand, such a defined position in the unlocked state makes it easier to grasp and thus the maneuverability of the holding device for bringing about a renewed fixation of the tube lifter in the closed state, and the operator can get used to repeated actuation actions.

According to one embodiment of the invention, it proves to be advantageous if the locking element is designed in the shape of a U-bracket and can be arranged so that it can encompass the lifting tube or the operating device in an approximately horizontal plane from the outside, the two coupling areas in the area of the free ends of the U -Form are arranged. In this training, the operator is the locking member in the area of the transverse Grip leg between the two legs carrying the coupling areas. But it is also conceivable that the locking member surrounds the lifting tube in an approximately horizontal plane from the outside to form a frame. This could motivate an embodiment that allows the locking member to be grasped on one side or the opposite other side during handling.

It proves to be particularly advantageous if the locking member can be brought into a fixation connection (locking) and out of a fixation connection (loosening) at the same time by manual one-hand actuation with respect to both holding points. For this purpose, the locking member comprises a manual grip area, on which it can be gripped with one hand of the operator and in particular can be pivoted and / or adjusted linearly. If the locking member is designed, for example, in the shape of a U-bracket, then the cross strut or apex strut of the U-shape preferably forms a manual grip area that a user can comfortably grasp and thus operate the locking member with just one hand.

With regard to ease of use, it has proven to be advantageous if the manual one-hand operation is a pivoting operation of the locking member combined with a short linear adjusting movement of the locking member. The linear adjusting movement can be, for example, a pulling movement or a sliding movement, in particular in each case approximately in a horizontal plane.

According to a further embodiment of the tube lifter according to the invention, it can be provided that the locking element automatically enters the detachable fixing connection when the lifting tube is raised when the lifting tube reaches its shortened, collapsed state, in that the two coupling areas of the locking element each have a centering opening for the holding points, so that the stopping points are automatically and compulsorily detected by the respective centering opening when moving up and are positively guided into a fixing position that engages behind the vertical direction in the respective coupling area. This then even saves manual operation of the locking member. Nevertheless, the locking member can be actuated manually for the purpose of releasing the fixing position. For the implementation of the above automatic fixation when the tube lifter is raised, it proves to be advantageous if the locking member has a link guide track for each stopping point, which then lead to the coupling areas in order to form an engagement behind the stopping points that causes the fixation position.

Instead of forming a mechanical, positive-locking holding connection between the coupling areas of the locking member and the two holding points, it can also be provided that the two coupling regions of the locking member and the holding points are designed so that the releasable holding connection is a magnetic or electromagnetic holding connection. In such cases, the holding points and coupling areas comprise magnetic or magnetizable materials.

Figur 1

eine perspektivische und teilweise Ansicht eines erfindungsgemäßen Schlauchhebers im kontrahierten und gegen Herabfallen fixierten Zustand;

Figur 2

eine Seitenansicht des Schlauchhebers nach Figur 1;

Figur 3

eine weitere Seitenansicht des Schlauchhebers gesehen in Richtung des Pfeils III in Figur 2;

Figur 4

eine Figur 1 entsprechende Ansicht einer weiteren Ausführungsform eines erfindungsgemäßen Schlauchhebers;

Figur 5

eine perspektivische und teilweise Ansicht des erfindungsgemäßen Schlauchhebers im gelösten nicht fixierten Zustand;

Figur 6

eine Seitenansicht des Schlauchhebers nach Figur 5;

Figur 7

eine schematische Darstellung einer weiteren Ausführungsform eines erfindungsgemäßen Schlauchhebers mit automatischer Verriegelungsfunktion; und

Figur 8

eine perspektivische Gesamtansicht des erfindungsgemäßen Schlauchhebers.

Further features, details and advantages of the invention emerge from the attached patent claims and from the drawings and the following description of preferred embodiments of the invention. In the drawing shows:

Figure 1

a perspective and partial view of a tube lifter according to the invention in the contracted state and fixed against falling;

Figure 2

a side view of the tube lifter according to Figure 1 ;

Figure 3

a further side view of the tube lifter seen in the direction of arrow III in FIG Figure 2 ;

Figure 4

one Figure 1 corresponding view of a further embodiment of a tube lifter according to the invention;

Figure 5

a perspective and partial view of the tube lifter according to the invention in the released, non-fixed state;

Figure 6

a side view of the tube lifter according to Figure 5 ;

Figure 7

a schematic representation of a further embodiment of a tube lifter according to the invention with an automatic locking function; and

Figure 8

a perspective overall view of the tube lifter according to the invention.

the Figures 1 to 3 show a first embodiment of a tube lifter 2 according to the invention. The tube lifter 2 comprises a lifting tube 4, of which only a vertically lower end area is shown, as well as an operating device 6 and a suction gripping device 8 connected vertically below the operating device 6. The operating device 6 comprises a lifting tube connection 10 for fastening with the lifting tube 4 and for establishing a flow connection with a tube interior 12 of the lifting tube 4. Furthermore, the operating device comprises an interface, referred to as a suction connection 14, to the suction gripping device 8.

The operating device 6 comprises, in a manner known per se, a valve device as well as a control mechanism and a manually operable operating element 16 which is ergonomically provided on a manually grippable handle 18 of the operating device 6. By actuating the operating element 16 on the handle 18, flow connections between a vacuum-generating device (not shown), the hose interior 12 and the suction gripping device 8, which can be placed on an object to be sucked in, lifted and displaced, can be established in a desired and known manner.

Typically, tube lifters of the type mentioned above are either suspended in a stationary manner or provided so that they can be moved on struts or crane arms. When the tube lifter is to be taken out of service or during breaks in handling, the operating device 6 is used to create a vacuum in the tube interior 12 of the lifting tube 4 such that the tube lifter 2 is upwardly contraction of the lifting tube 4 is driven into its shortened and typically contracted configuration to the stop. In order to prevent sinking or even falling when the vacuum source is switched off, the tube lifter 2 is fixed in this state by means of a holding device 20. This holding device 20 has been improved according to the invention. It comprises an arrangement that forms a support net, in the present case in particular four essentially vertically extending belt sections 22, which are connected at the bottom and in particular also in the middle or at the top, for example, by a preferably flexible, ring-shaped closed belt section 23, partially fixed and partially displaceable, and a load-bearing element 24 of the holding device 20 form. The holding device 20 further comprises two horizontally and diametrically opposite holding points 26, for example in the form of protruding holding bolts 28, which in this embodiment have a free end 30 that is widened in the shape of a flange.

The holding device 20 further comprises a dimensionally stable locking member 32 which is formed from a single component and which is preferably designed in the form of a U-bracket here. This locking member 32 is detachably connected, for example, to two diametrically opposite belt sections 22 by having an eyelet-forming, for example elongated, slot-shaped opening 34 into which the belt section 22 in question engages or is in turn suspended with a loop-shaped end. In this way, the bow-shaped locking member 32 is pivotable and, so to speak, held in a floating manner on the belt sections 22. A differently designed connection of the locking member 32 with the two Belt sections 22 would also be conceivable as long as the locking member 32 is pivotable and floating on the belt sections.

The locking member 32 also has two coupling areas 36, 38 which are provided diametrically opposite one another in accordance with the arrangement of the holding points 26. The coupling areas 36, 38 are hook-shaped in the case shown as an example. A plane of this hook shape is each vertically oriented so that the respective coupling area 36, 38 forms a through-opening 40, which is radial with respect to the lifting tube 4, for the retaining bolts 28 (In Figure 5 best visible when not fixed). This passage opening 40 is not closed due to the hook shape, but opens outward via an inlet opening 42, so that the respective holding point 26 designed as a retaining bolt 28 via this inlet opening 42 into the Figures 1 to 3 position shown can reach, which will be described below. First of all, it should also be mentioned that the locking member 32 is additionally held by means of an elastically stretchable element 44. This can be a rubber band or any elastic or elasticized element 44 per se. In the present case, it is arranged, for example, between a belt section 22 and a region 46 of the locking member 32, which is somewhat spaced from the coupling regions 36, 38 and from the elongated slot-shaped openings 34 for the engagement of the belt sections 22. As a result, a force that gives away the locking element 32 is generated on the locking element 32 and introduced into it. This force has the effect that the locking member 32 is not locked, i.e. not interacting with the breakpoints 26, which is shown in FIG Figures 5 and 6th is shown in the in Figures 5 and 6th position shown is pivoted in contact with the lifting tube 4. In this position, the locking member 32 is then arranged in a defined manner on the lifting tube 4 and does not swing around in an uncontrolled manner.

To the holding device 20 starting from the in Figures 5 , 6th To lock the unlocked position shown again, the lifting tube 4 for contracting, that is to say the tube lifter 2 for moving upward, is controlled via the operating device 6. When the lifting tube 4 has reached its contracted state or shortly before that, the operator grips a manual grip area 48 of the locking member 32 with one hand and swivels the floating locking member 32 in the direction of the arrow 50 in FIG Figure 5 downward. In addition, the operator can exert a relatively short linear pushing and / or pulling movement on the locking member 32 in the horizontal direction, so that the bolt-shaped holding point 26 can reach the access opening 40 of the respective coupling area 36, 38 via the entry opening 42, so that the in Figures 1 to 4 shown fixing position is reached. One recognizes from Figures 1 to 4 that in this exemplary horizontal position of the locking member 32, the elastically stretchable element 44 is tensioned. It is possible, by shaping the coupling regions 36, 38 delimiting the respective access opening 40, to make this horizontal position of the locking member 32 stable. A stable horizontal position of the locking member 32 can also be supported by the fact that the slot-shaped opening 34 on which the respective belt section 22 is suspended is, almost exactly vertically above the center point of the access opening 40 and thus the holding points 26 is arranged. If the negative pressure in the hose interior is switched off, the operating device 6 sinks downward due to gravity until it is prevented from further sinking by the holding points 26 received in the access opening 40. The bow-shaped locking member 32 is then stably stabilized in the horizontal position. However, it is also conceivable to design and arrange the locking member 32 in such a way that the elastically stretchable element 44, when the locking member 32 is released, the locking member 32 starting from the position shown in FIG Figures 1 to 4 can pivot upwards again, i.e. in the direction of the in Figures 5 and 6th indicated position, but while maintaining the positive retaining connection with the holding points 26. In this position, additional securing would then be implemented by entangling the hook-shaped coupling areas 36, 38 in order to prevent the holding points 26 from being in any way out of their fixed position with the coupling areas 36, 38 can slide out. It would also be conceivable that the slot-shaped opening 34, for example here, on which the respective belt section 22 is hung, is deliberately arranged somewhat horizontally offset with respect to the center point of the access opening 40, so that the load hung there automatically tilts the locking member 32, that is Is realized due to gravity when the load of the operating device 6 together with the suction gripping devices 8 loads the locking member 32. However, this is not necessary in the present case, since the laterally protruding holding points 26 are received in a stable manner in the hook-shaped delimited penetration opening 40 of the coupling areas 36, 38 and that Locking member 32 remains stable in its horizontal position.

The embodiment according to Figure 4 differs from the embodiment according to Figures 1-3 only in that the retaining bolts 28 do not have a widened free end. This is also not necessary because the distance between the coupling areas 36, 38 of the locking member 32 is dimensioned in such a way that the locking member 32 can indeed grip around the operating device 6 and the lifting tube 4, but not over the when engaging with the holding points 26 or holding bolts 28 free end of a retaining bolt 28 can slide away.

In a further embodiment, but not shown in detail, it would be conceivable that instead of or in addition to a mechanical engagement connection between the coupling areas and the holding points, a magnetic or electromagnetic coupling or fixing is provided. In such a case, magnetic or magnetizable materials would be provided in the area of the holding points 26 and the coupling areas 36, 38.

Figure 7 schematically illustrates a further embodiment in which the locking member 32 has a link guide track 52 on each side. When the tube lifter is raised, the stopping point 26 arrives at this link guide track 52 of the locking member 32 and is then positively guided and automatically brought into the final fixing position behind the gate at the end of the link track 52, in which the tube lifter 2 is fixed against falling. It proves to be advantageous that the Coupling areas 36, 38 of the locking member 32 on both sides each have a centering opening for the holding points, so that the holding points 26 are automatically and compulsorily captured by a respective centering opening 54 when they are raised and are positively guided into a fixed position at the respective coupling area 36, 38 that engages behind the vertical direction.

In Figure 8 Finally, a perspective overall view of the tube lifter 2 according to the invention is also shown. The overall construction of the holding device 20 can be seen with belt sections 22, of which at least two opposite belt sections 22 form the load-bearing element 24 of the holding device 20. The belt sections 22 are preferably detachably connected at the top to an exemplary metallic flange-shaped retaining plate 60. The holding plate 60 rests flat on a connecting flange 62 of the lifting tube 4 and is held by it. The connection flange 62 of the lifting tube 4 extends with a loadable connection tubing 64 through an opening in the holding plate 60 and can be connected to a tubing carrying the lifting tube under vacuum. However, this is only an example. The lifting tube 4 can also be suspended in any other arbitrary manner, in which case the connecting flange 62 of the lifting tube 4 can have, for example, hooks or eyes for attaching to a crane arm or crane truck. A vacuum connection of the lifting tube 4 is then preferably implemented via flexible, flexible lines. It is also conceivable that the holding device 20 itself can be releasably fastened directly to a support arm, crane arm or crane truck and does not rest on the connecting flange 62 of the lifting tube 4 as shown.

Claims (15)

Tube lifter (2) with a lifting tube (4), which has a tube interior (12) and can be shortened by applying negative pressure to the tube interior (12), and with a suction gripping device (8) arranged at one end of the lifting tube (4), which through the hose interior (12) can be supplied with negative pressure for sucking in and lifting an object,
and with an operating device (6) which has a suction connection (14) for flow connection with the suction gripping device (8), a lifting tube connection (10) for flow connection with the tube interior (12) of the lifting tube (4) and a valve device for controlling flow connections and a has manually operable operating element (16), and with a holding device (20) for fixing the operating device (6) together with the suction gripping device (8) and the lifting tube (4) in the shortened, contracted state of the lifting tube to prevent unintentional lowering or falling, the holding device (20) has two holding points (26) opposite one another with respect to the lifting tube (4) and the operating device (6), at which a load-bearing element (24) of the holding device (20) for fixing the operating device (6) together with the suction gripping device (8) and the lifting tube (4) can attack,
characterized in that a dimensionally stable Locking member (32) is provided which is in a load-bearing connection with the load-bearing element (24) and which is designed and arranged so that it can simultaneously form a load-bearing, releasable fixing connection with both holding points (26), and that the locking member (32 ) has two coupling areas (36, 38) for this purpose, which are arranged in such a way that they can form the detachable fixing connection with the opposing holding points (26). Tube lifter (2) according to Claim 1, characterized in that the two coupling areas (36, 38) of the locking member (32) and the two holding points (26, 28) are designed so that the releasable fixing connection is a mechanical, form-fitting retaining connection. Tube lifter (2) according to claim 1 or 2, characterized in that the two coupling areas (36, 38) are hook-shaped, an open engagement area of the hook being arranged on an underside of the locking member (32). Tube lifter (2) according to Claim 1, 2 or 3, characterized in that the two holding points (26) are formed by outwardly protruding bolts (28) or pins, in particular with a free end (30) of enlarged diameter. Tube lifter (2) according to one or more of the preceding claims, characterized in that the locking member (32) is connected to the load-bearing element (24) in a pivotable and / or floating manner. Tube lifter (2) according to one or more of the preceding claims, characterized in that the load-bearing element (24) is an arrangement of vertically extending straps (22) provided outside the lifting tube (4). Tube lifter (2) according to one or more of the preceding claims, characterized in that the load-bearing element (24) is held on a crane arm which also carries the lifting tube (4), in particular on a running element of a crane arm. Tube lifter (2) according to one or more of the preceding claims, characterized in that the locking element (32) is acted upon by an elastic element (44) which the locking element (32) with respect to the lifting tube (4) or the load-bearing element (24) biasing toward a position. Tube lifter (2) according to one or more of the preceding claims, characterized in that the locking element (32) is designed in the shape of a U-bracket and can be arranged in such a way that it connects the lifting tube (4) or the operating device (6) in an approximately horizontal plane from the outside can encompass, wherein the two coupling areas (36, 38) are arranged in the area of the free ends of the U-shape. Tube lifter (2) according to one or more of the preceding claims, characterized in that the locking member (32) surrounds the lifting tube (4) in an approximately horizontal plane from the outside to form a frame. Tube lifter (2) according to one or more of the preceding claims, characterized in that the locking member (32) can be brought into a fixation connection (locking) and apart from a fixation connection (loosening) with respect to both holding points (26) at the same time by manual one-handed actuation. Tube lifter (2) according to one or more of the preceding claims, characterized in that the manual one-hand operation is a pivoting operation of the locking member (32) combined with a short linear adjustment movement of the locking member (32). (Pulling movement, sliding movement) Tube lifter (2) according to one or more of the preceding claims, characterized in that the locking member (32) automatically moves into the detachable fixing connection when the lifting tube (4) is raised when the lifting tube (4) reaches its shortened, collapsed state by the two Coupling areas (36, 38) of the locking member (32) each have a centering opening (54) for the holding points (26), so that the holding points (26) automatically and compulsorily captured by the respective centering opening (44) and positively guided into one of the vertical direction reaching behind fixing position at the respective coupling area (36, 38). Tube lifter (2) according to Claim 13, characterized in that the locking member (32) forms a link guide track (52) for each stopping point (26). Tube lifter (2) according to one or more of the preceding claims, characterized in that the two coupling areas (36, 38) of the locking member (32) and the holding points (26) are designed so that the releasable holding connection is a magnetic or electromagnetic holding connection.

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