Self-locking gripping device and gripping device arrangement

Abstract

Self-locking gripping device (1) for the vertical transport of cylindrical elements (20), in particular cylindrical mobile vehicle barriers, with a support frame (2), wherein two clamping levers (10, 11) are pivotally coupled to the support frame (2) opposite one another and the clamping levers (10, 11) are each pivotably coupled at their ends to a clamping jaw (14, 15), characterized in that the support frame (2) has two horizontally arranged receiving areas (6, 7) for receiving a pallet fork, wherein the clamping levers (10, 11) are coupled to an upper side (12, 13) of the support frame (2) and the clamping jaws (14, 15) are each connected to a roller (16, 17).

Description

[0001] The present invention relates to a self-locking gripping device for the vertical transport of cylindrical elements, in particular cylindrical mobile vehicle barriers, with the features in the preamble of claim 1.

[0002] Furthermore, the invention relates to a gripping device arrangement according to the features in the preamble of claim 14.

[0003] Cylindrical elements in the form of mobile vehicle barriers are known in the prior art. These mobile vehicle barriers are security barriers in the form of a solid cylinder that can be deployed temporarily or permanently on roads or squares to selectively prevent vehicles from passing through, for example, at events or in other sensitive areas. These vehicle barriers typically have a base plate on which the actual barrier, in the form of the cylinder, is mounted. The cylinder itself is usually between 100 cm and 150 cm high with a diameter between 25 cm and 30 cm. The top of the cylinder may be rounded, depending on the design. The cylinders usually have a steel wall filled with concrete. Such vehicle barriers typically weigh between 300 kg and 600 kg.

[0004] Manually lifting or setting up the cylindrical vehicle barriers is impossible due to their high weight. Therefore, the cylindrical barriers have threaded holes at the top into which transport aids, especially lifting eyes, can be screwed. Using a chain, the barriers can then be lifted by a crane or forklift and set up in the desired position. However, this has two significant disadvantages. Since the barriers are only connected to the vehicle at one point at the top, they can swing or sway relative to the vehicle during transport. This poses a danger, especially in areas frequented by people during setup or dismantling. Furthermore, the lifting eye must be screwed in and out for each transport operation.The screw connections can also represent a potential weak point under stress during several years of use.

[0005] Alternatively, cylindrical elements can be lifted using self-locking gripping devices. Such gripping devices typically have a support frame with two opposing clamping levers pivotally coupled to the support frame. Each clamping lever is pivotally coupled to clamping jaws at its end. The cylindrical elements can then be gripped into the device via these jaws.

[0006] A corresponding gripping device is known, for example, from FR 2671131. The gripping device disclosed here can be lifted by means of a crane. For this purpose, chains are attached to the clamping levers, via which the gripping device can be connected to the crane. Lifting the cylindrical elements thus necessarily requires a crane, which is often unusable, especially in rough terrain. Furthermore, here too, the chain connection creates the risk of the gripping device, along with the cylindrical element contained within it, swinging or oscillating.

[0007] Starting from this premise, the object of the present invention is to provide an improved self-locking gripping device for the vertical transport of cylindrical elements, in particular cylindrical mobile vehicle barriers, which can be coupled to a pallet fork. Furthermore, the object of the invention is to provide a corresponding gripping device arrangement.

[0008] The aforementioned tasks are solved by a self-locking gripping device according to the features in claim 1 and a gripping device arrangement according to the features of claim 14.

[0009] Advantageous embodiments of the present invention are the subject of the dependent claims.

[0010] The self-locking gripping device according to the invention is used for the vertical transport of cylindrical elements, in particular cylindrical mobile vehicle barriers. Vertical transport, as defined in the invention, means that the cylindrical elements are essentially vertically oriented during the transport process. This has the advantage that the cylindrical elements do not need to be rotated or turned during either picking up or setting down. Only lifting or lowering is required. Due to the vertical orientation of the cylindrical elements, they do not protrude laterally beyond the gripping device, thus reducing the space required for transport.

[0011] The self-locking gripping device has a support frame, with two clamping levers pivotally coupled to the support frame in opposite directions. Each clamping lever is in turn pivotally coupled to a clamping jaw at its end.

[0012] According to the invention, the support frame has two horizontally arranged receiving areas for a pallet fork. A pallet fork is an attachment for front loaders, for example on tractors, wheel loaders, forklifts, or telescopic handlers. Pallet forks can also be coupled with three-point linkages. They preferably comprise a tine carrier and two tines mounted laterally. A tine of the pallet fork can be inserted into each of the receiving areas, so that the self-locking gripping device can be securely mounted on the pallet fork and moved by the front loader.

[0013] A key aspect of the invention is that the clamping levers are coupled to an upper surface of the support frame, and each clamping jaw is connected to a roller. The rollers are preferably connected to the clamping jaws externally by means of bearing devices. The axles of the rollers are also preferably arranged below the clamping jaws. To lift a cylindrical element with the gripping device, the support frame is moved towards the cylindrical element using the front loader so that the cylindrical element is positioned between the opposing clamping jaws. Since the clamping levers are coupled to an upper surface of the support frame according to the invention, the support frame can be positioned as low as possible on the cylindrical element. In this state, the rollers are in contact with the ground and / or with a base plate of the cylindrical element.The clamping jaws connected to the rollers and the clamping levers coupled to the clamping jaws are in a raised position, so that the distance between the clamping jaws is greater than the diameter of the cylindrical element.

[0014] When the support frame is lifted, the rollers lose contact with the surface or the base plate of the cylindrical element, causing the clamping jaws and clamping levers to move downwards relative to the support frame. Due to the pivoting connection between the clamping jaw, clamping lever, and support frame, this movement causes the opposing clamping jaws to move towards each other and enclose the cylindrical element. Once the clamping jaws enclose the cylindrical element, further pivoting of the clamping lever or the clamping jaws is no longer possible. Further lifting of the support frame then ensures that the clamping jaws are pressed firmly against the cylindrical element, lifting it along with the support frame.

[0015] Preferably, when the gripping device is in a functional position, i.e., when a cylindrical element is picked up and lifted by the gripping device, the rollers are positioned, at least partially, opposite the underside of the support frame. When the support frame is lowered again, the rollers thus come into contact with the surface and / or the base plate of the cylindrical element first. This causes the clamping jaws and the clamping levers connected to them to move upwards again, simultaneously causing the opposing clamping jaws to separate. This releases the cylindrical element.

[0016] In a rest or receiving position, where the rollers are in contact with the floor and / or a base plate of the cylindrical element, the clamping jaws can be raised by 5 cm to 10 cm relative to the support frame compared to the functional position.

[0017] The rollers have a diameter of 10 cm to 20 cm, preferably 12 cm to 18 cm, and most preferably 14 cm to 16 cm. The rollers are preferably made of plastic.

[0018] Preferably, the support frame is U-shaped, with the clamping levers arranged on opposite legs of the support frame. The legs of the support frame are connected, in particular, by a web that joins the legs on the side of the support frame facing the front loader. The U-shaped design of the support frame has the advantage that the cylindrical element can be positioned between the legs, allowing the opposing clamping jaws to come into contact with the cylindrical element. During transport, the cylindrical element is located centrally within the support frame, which has a beneficial effect on weight distribution and thus transport safety.

[0019] In particular, the opposing legs are two hollow profiles, with the cavities of these profiles forming the receiving areas for the pallet forks. A tine of the pallet fork can be inserted into each cavity. During transport, the cylindrical element is thus positioned centrally between the tines of the pallet forks. To secure the support frame to the pallet forks, the support frame and the pallet forks can be coupled using a chain or other locking device.

[0020] Preferably, the clamping jaws have internal clamping surfaces, the cross-section of which is preferably arcuate. The arcuate shape of the clamping surfaces ensures a secure and firm fit between the clamping jaws and the cylindrical element. This prevents the cylindrical element from slipping during transport.

[0021] In particular, the arc-shaped clamping surfaces have an opening angle of 75° to 105°, preferably 80° to 100°, and most preferably 90°. These opening angles have proven particularly advantageous within the scope of the invention for ensuring a secure fit of the cylindrical elements during transport, while simultaneously facilitating their easy insertion into the gripping device. If the opening angle of the clamping surfaces is too large, inserting the cylindrical elements between the clamping jaws becomes difficult. Conversely, if the opening angle is too small, a secure fit of the cylindrical element in the gripping device during transport cannot be guaranteed.

[0022] It has also proven advantageous if the clamping surfaces are provided with a non-slip coating, particularly a rubber coating. This further increases the secure fit between the clamping jaws and the cylindrical elements.

[0023] The clamping jaws can each have a collar on their receiving edge, the collar preferably being oriented transversely, and more preferably at right angles to the edge. The collars facilitate the easy insertion of the cylindrical elements between the clamping jaws. When the clamping jaws are moved towards a cylindrical element, the outwardly projecting collars ensure that the cylindrical element is guided into the receiving space defined by the clamping jaws. The collars can also be provided with a non-slip coating, in particular with a rubber coating. In addition to the advantages already mentioned, the non-slip coating also prevents the outer surfaces of the cylindrical elements from being damaged by contact with the clamping surfaces or the collars.

[0024] Furthermore, it has proven advantageous to connect a stabilizing post to the support frame. The stabilizing post is aligned perpendicular to the plane of the support frame in its longitudinal direction and thus runs essentially parallel to a cylindrical element held in the gripping device. The stabilizing post is connected to the support frame in such a way that a cylindrical element held by the gripping device makes at least partial contact with the stabilizing post. Particularly with cylindrical elements exceeding 100 cm in length, the stabilizing post ensures a secure fit of the cylindrical element within the gripping device. The stabilizing post can also be provided with a non-slip coating, especially rubber, to further enhance the secure fit of the cylindrical element within the gripping device.

[0025] Preferably, each clamping lever is provided with a locking element, whereby the angle formed between the clamping levers and the support frame can be adjusted by means of the locking element in a rest position of the gripping device. The locking element can be, for example, a bolt or a screw that extends through the clamping levers. In the rest position of the gripping device, the angle between the clamping lever, which is pivotably coupled to the support frame, is determined by the locking element, since it is in contact with the support frame. If the locking element is designed as a screw and this screw is screwed further into the clamping lever, the screw protrudes further on the side of the clamping lever facing the support frame, thus increasing the angle between the clamping lever and the support frame.This allows the clamping levers and the clamping jaws coupled to the clamping lever to be adjusted both in their height and in their distance from each other, so that optimal adaptation of the gripping device to the dimensions of the cylindrical elements to be transported is possible.

[0026] The invention further comprises a gripping device arrangement, which is formed from a self-locking gripping device according to the invention and a cylindrical element. The gripping device arrangement is characterized in that the cylindrical element is fixed in the self-locking gripping device by the clamping jaws, wherein the clamping jaws grip the cylindrical element in a lower third, in particular in a lower quarter of the cylindrical element.

[0027] All the aforementioned features and properties of the self-locking gripping device can also be part of the gripping device arrangement without leaving the scope of the invention.

[0028] Further features, properties and advantages of the invention are the subject of the following description of the figures.

[0029] They show: Fig. 1. A self-locking gripping device in one perspective, Fig. 2a the self-locking gripping device in a front view, Fig. 2b the self-locking gripping device in a side view, Fig. 2c the self-locking gripping device in a top view, Fig. 3a a gripping device arrangement in the open state in a perspective view, Fig. 3b the gripping device arrangement in the open state in a front view, Fig. 4a the gripping device arrangement in a closed state in a perspective view, Fig. 4b the gripping device arrangement in the closed state in a front view, Fig. 5 a clamping jaw with roller in a top view and Fig. 6 a clamping lever in a side view.

[0030] The same reference numerals are used for corresponding parts or components, even if a repeated description is omitted for the sake of simplicity. The figures are schematic drawings intended to facilitate understanding of the invention.

[0031] The Fig. Figure 1 shows a self-locking gripping device 1. The self-locking gripping device 1 is in the Fig. 1 shown in one perspective. Fig. 2a shows a front view, which Fig. 2b a side view and the Fig. 2c a top view of the self-locking gripping device 1.

[0032] The self-locking gripping device 1 is used for the vertical transport of cylindrical elements, in particular cylindrical mobile vehicle barriers. The self-locking gripping device 1 has a U-shaped support frame 2, the opposing legs 3, 4 of which are designed as hollow profiles. The opposing legs 3, 4 are connected to each other by a web 5. The hollow spaces of the opposing legs 3, 4 form receiving areas 6, 7 for receiving pallet forks. One of the tines of the pallet fork (not shown) can be inserted into each of the receiving areas 6, 7. A locking element 9 is integrated at each of the open ends 8 of the opposing legs 3, 4, which prevents the pallet fork from fully passing through the receiving areas 6, 7.

[0033] Two clamping levers 10, 11 are pivotably connected opposite each other to a top surface 12, 13 of the respective legs 3, 4. The clamping levers 10, 11 are each pivotally coupled at their ends to a clamping jaw 14, 15. The clamping jaws 14, 15 are each connected to a roller 16, 17. The rollers 16, 17 are connected to the clamping jaws 14, 15 on their outer surfaces 38 by means of bearing devices 18, 19. This is particularly evident in the Fig. 2a shows the front view.

[0034] The Fig. 2a also shows that the axes a of the rollers 16, 17 are arranged below the clamping jaws 14, 15.

[0035] The Fig. Figure 3 shows a gripping device arrangement 23 with a self-locking gripping device 1 in an open state, before receiving a cylindrical element 20 designed as a mobile vehicle barrier. The cylindrical element 20 comprises a base plate 21 and a cylindrical shaft 22 connected to the base plate 21.

[0036] To receive the cylindrical element 20 into the self-locking gripping device 1, the support frame 2 is first positioned by the front loader so that the cylindrical element 20 is located between the opposing legs 3, 4 of the support frame 2. The clamping levers 10, 11 coupled to the legs 3, 4, and the clamping jaws 14, 15, which are also pivotably coupled to them, are lifted by the rollers 16, 17 connected to the clamping jaws 14, 15 and thus held in an open position in which they do not yet contact the cylindrical element 20. The rollers 16, 17 are still in contact with the base plate 21 of the cylindrical element.

[0037] The Fig. Figure 4 shows the gripping device assembly 23 in its closed state. Here, the cylindrical element 20 is held in the self-locking gripping device 1. When the support frame 2 is lifted by the front loader, initially only the support frame 2 itself moves upwards, while the rollers 16, 17 remain on the ground. Simultaneously, the angle α formed between the support frame 2 and the clamping levers 10, 11 decreases. This causes the clamping jaws 14, 15 to be pressed inwards towards the cylindrical element 20. As the support frame 2 is lifted further, the rollers 16, 17 lose contact with the base plate 21, and the clamping jaws 14, 15 are pressed firmly against the cylindrical element 20 by its own weight. The cylindrical element 20 is thus securely clamped between the clamping jaws 14, 15.The clamping jaws 14, 15 grip the cylindrical element 20 in a lower third of the cylindrical element 20.

[0038] The Fig. Figure 4 also shows that when the gripping device is in a functional position, the rollers 16, 17 project section by section towards a lower surface 24 of the support frame 2. When the cylindrical element 20 is set down, the rollers 16, 17 first come into contact with the base plate 21 of the cylindrical element 20. This causes the clamping levers 10, 11 and the clamping jaws 14, 15 to be moved upwards, resulting in a widening of the area between the clamping jaws 14, 15. The cylindrical element 20 is thus no longer wedged by the clamping jaws 14, 15, so that the self-locking gripping device 1 is released from the cylindrical element 20.

[0039] In the Fig. Figure 5 shows a detailed top view of the clamping jaw 14. To securely grip the cylindrical elements 20, the clamping jaws 14 and 15 have internal clamping surfaces 25. The clamping surfaces 25 have a circular arc cross-section, with the circular arc clamping surface 25 located in the Fig. The embodiment shown in Figure 5 has an opening angle β of 75°. The clamping surfaces 25 are each provided with a non-slip coating 26, here in the form of a rubber coating. The rubber coating further increases the frictional force formed between the cylindrical element 20 and the gripping jaws 14, 15.

[0040] The clamping jaws 14, 15 each have a collar 28 on their receiving edge region 27, with the collars 28 being oriented at right angles to the edge region 27. The collars 28 facilitate the easy insertion of the cylindrical elements 20 between the clamping jaws 14, 15, since the right-angled arrangement of the collars 28 to the clamping jaws 14, 15 guides the cylindrical elements 20 towards the receiving area between the clamping jaws 14, 15. The collars 28 are also provided with a non-slip coating 26 in the form of a rubber lining.

[0041] Fig. Figure 5 also shows that the rollers 16, 17 in the embodiment shown here have a diameter D of 16 cm.

[0042] The Fig. Figures 1 to 4 further show that the self-locking gripping device 1 comprises a stabilizing post 29, which is connected to the support frame 2. The stabilizing post 29 is oriented in its longitudinal direction L perpendicular to the plane of the support frame and essentially parallel to a received cylindrical element 20. A cylindrical element 20 received by the gripping device 1 contacts the stabilizing post 29 at least partially in the received state, so that the cylindrical element 20 is held and stabilized in its position by the stabilizing post 29. The side 30 of the stabilizing post 29 facing the clamping jaws 14, 15 is provided with a non-slip coating 26, in this case a rubber coating. This also improves the stabilizing effect of the stabilizing post 29.The stabilizing post 29 is connected at its underside to the support frame 2, and specifically to the web 5, by means of a connecting web 31. At its upper end 32, the stabilizing post 29 is connected to the web 5 by means of two stabilizing elements 33, here in the form of L-profiles.

[0043] The support frame 2 has two handles 34 on each of its legs 3, 4, with which the gripping device 1 can be transported manually.

[0044] To achieve the pivotable coupling between the clamping levers 10, 11 and the support frame 2, two fastening elements 35 are joined to the legs 3, 4 of the support frame 2, with the fastening elements 35 being arranged at a distance from each other that essentially corresponds to the width of the clamping levers 10, 11. The fastening elements 35 each have four adjacent bores 36, with the clamping levers 10, 11 being pivotably coupled to the fastening elements 35 by a bolt 37, which extends through two opposing bores 36 in both the fastening elements 35 and the clamping levers 10, 11. The distance between the clamping jaws 14, 15 can be adjusted through the four adjacent openings, depending on which of the opposing openings 36 the clamping levers 10, 11 are connected to the fastening elements 35.This allows the gripping device 1 to be adapted to the dimensions of the cylindrical elements 20 to be transported.

[0045] To pivotally couple the clamping jaws 14, 15 with the clamping levers 10, 11, the clamping jaws 14, 15 each have two opposing fastening elements 35 on their outer sides 38, each of which is provided with four bores 36. Here, too, the clamping levers 10, 11 are pivotally coupled to the fastening elements 35 of the clamping jaws 14, 15 by a bolt 37 extending through the bores 36 of the fastening elements 35 and through the clamping levers 10, 11. To prevent the clamping jaws 14, 15 from folding down completely, a locking pin 39 is provided between the uppermost bores 36 of each clamping jaw. This locking pin extends through the two opposing bores 36 and rests on the clamping levers 10, 11. The locking element 39 holds the clamping jaws 14, 15 in an upright position without fixing them firmly to the clamping levers 10, 11.

[0046] The clamping levers 10, 11 can, as in a Fig. As shown in the side view of the clamping levers 10, 11 in Figure 6, a locking element 40 is provided. The locking element 40 is, in particular, a screw or bolt that extends through the clamping levers 10, 11. The lower end 41 of the locking element is in contact with the legs 3, 4 of the support frame 2. By rotating the locking element 40, its lower end 41 can be extended further out of or retracted from the clamping levers 10, 11. This allows the angle α formed between the support frame and the clamping levers 10, 11 to be increased or decreased. This, in turn, allows the distance between the clamping jaws 14, 15 to be adjusted. The locking elements 40 thus provide a further adjustment option for adapting the distance between the clamping jaws 14, 15 to the cylindrical element 20 being transported.

[0047] The Fig. It can also be seen from figure 6 that the clamping levers 10, 11 each have end bores 42 which are penetrated by the bolts 37 for pivotable fastening of the clamping levers 10, 11 with the legs 3, 4 and the clamping jaws 14, 15. Reference symbol: 1 gripping device 2 support frames 3 legs 4 legs 5 Bridge 6 Recording area 7 Recording area 8 End 9 Locking element 10 clamping levers 11 clamping levers 12 Top of 3 13 Top of 4 14 clamping jaws 15 clamping jaws 16 rolls 17 rolls 18 Storage device 19 Storage device 20 cylindrical element 21 Base plate 22 cylindrical shaft 23 Gripping device arrangement 24 Bottom of 2 25 clamping surface 26 anti-slip coating 27 Edge area 28 collars 29 stabilizing posts Page 30 of 26 31 Connecting bridge 32 top end 33 Stabilizing element 34 grab handles 35 fasteners 36 holes 37 bolts 38 Outside of 14, 15 39 Safety element 40 locking element 41 End of 40 42 end holes a axis of 16, 17 L Longitudinal direction of 29 α angle β Opening angle QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] FR 2671131

[0006]

Claims

[1] Self-locking gripping device (1) for the vertical transport of cylindrical elements (20), in particular cylindrical mobile vehicle barriers, with a support frame (2), wherein two clamping levers (10, 11) are pivotably coupled to the support frame (2) opposite each other and the clamping levers (10, 11) are each pivotably coupled at their ends to a clamping jaw (14, 15), characterized by , that the support frame (2) has two horizontally arranged receiving areas (6, 7) for receiving a pallet fork, wherein the clamping levers (10, 11) are coupled to a top (12, 13) of the support frame (2) and the clamping jaws (14, 15) are each connected to a roller (16, 17). [2] Self-locking gripping device (1) according to claim 1, characterized by , that the support frame (2) is U-shaped, wherein the clamping levers (10, 11) are arranged on opposite legs (3, 4) of the support frame (2). [3] Self-locking gripping device (1) according to claim 2, characterized by , that the opposite legs (3, 4) are two hollow profiles, the cavities forming the receiving areas (6, 7) for receiving the pallet fork. [4] Self-locking gripping device (1) according to one of claims 1 to 3, characterized by , that the rollers (16, 17) are connected to the outer sides (38) of the clamping jaws (14, 15) by means of bearing devices (18, 19). [5] Self-locking gripping device (1) according to any one of claims 1 to 4, characterized by , that the axes (a) of the rollers (16, 17) are arranged below the clamping jaws (14, 15). [6] Self-locking gripping device (1) according to any one of claims 1 to 5, characterized by that the rollers (16, 17) have a diameter (D) of 10 to 20 cm, preferably of 12 to 18 cm, particularly preferably of 14 to 16 cm. [7] Self-locking gripping device (1) according to any one of claims 1 to 6, characterized by, that when the gripping device (1) is in a functional position, the rollers (16, 17) protrude section by section from a bottom (24) of the support frame (2). [8] Self-locking gripping device (1) according to any one of claims 1 to 7, characterized by , that the clamping jaws (14, 15) have internal clamping surfaces (25), wherein the clamping surfaces (25) are in particular circular arc-shaped in cross-section. [9] Self-locking gripping device (1) according to claim 8, characterized by , that the circular arc-shaped clamping surfaces (25) have an opening angle (β) of 75° to 105°, preferably of 80° to 100°, particularly preferably of 90°. [10] Self-locking gripping device (1) according to claim 8 or 9, characterized by that the clamping surfaces (25) are provided with a non-slip coating (26), in particular with a rubber coating. [11] Self-locking gripping device (1) according to any one of claims 1 to 10, characterized bythat the clamping jaws (14, 15) each have a collar (28) on their receiving edge area (27), wherein the collar (28) is preferably oriented transversely, particularly preferably at right angles to the edge area (27). [12] Self-locking gripping device (1) according to any one of claims 1 to 11, characterized by , that a stabilizing post (29) is connected to the support frame (2), wherein the stabilizing post (29) is aligned in its longitudinal extension direction (L) perpendicular to the support frame plane, such that a cylindrical element (20) received by the gripping device (1) contacts the stabilizing post (29) at least section by section. [13] Self-locking gripping device (1) according to any one of claims 1 to 12, characterized by, that a locking element (40) is provided on each of the clamping levers (10, 11), wherein the angle (α) between the clamping levers (10, 11) and the support frame (2) can be adjusted by means of the locking element (40) in a rest position of the gripping device (1). [14] Gripping device arrangement (23) comprising a self-locking gripping device (1) with the features according to any one of claims 1 to 13 and a cylindrical element (20), in particular a cylindrical mobile vehicle barrier, characterized by , that the cylindrical element (20) is fixed in the self-locking gripping device (1) by the clamping jaws (14, 15), wherein the clamping jaws (14, 15) grip the cylindrical element (20) in a lower third, in particular in a lower quarter of the cylindrical element (20).

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