WO2007065955A1

WO2007065955A1 - Device for expanding pipe ends

Info

Publication number: WO2007065955A1
Application number: PCT/EP2006/069504
Authority: WO
Inventors: Horst Hofmann; Edgar Wilhelm; Georg Holland-Moritz
Original assignee: Rennsteig Werkzeuge Gmbh
Priority date: 2005-12-09
Filing date: 2006-12-08
Publication date: 2007-06-14
Also published as: DE102005059388A1

Abstract

The invention relates to a device (Ol) for expanding pipe ends. The device comprises an expanding bolt (02) which can be inserted into the pipe end in order to expand the cross section of the latter; a clamping element (06) which can be widened in cross section and which is arranged at an axial distance from the expanding bolt (02) and can be inserted into the pipe in the state not widened in cross section; a means for introducing a force to the clamping element (06) in order to widen its cross section to such an extent that it is clamped in place in the pipe and a tensile force occurring during the expansion of the pipe end can be introduced into the pipe essentially without a change in the axial position; and a means for displacing the expanding bolt (02) relative to the clamping element (06) clamped in place in the pipe in order to press the expanding bolt (02) into the pipe end and expand its cross section. Furthermore, the device preferably comprises a tie rod (03) and a pressure sleeve (04) guided on it, which are each guided axially by the expanding bolt (02), wherein the clamping element (06) is connected to the tie rod, and wherein a relative displacement between the tie rod (03) and the pressure sleeve (04) leads to the reversible widening of the cross section of the clamping element (06).

Description

Device for expanding pipe ends

The present invention relates to a device for

Widening one end of a pipe, in particular for preparing the pipe end for pipe connections, for example with fittings.

From the utility model DE 1 831 618 U a tool for expanding pipes is known, which is widely used. The tool head of this tool comprises a series of expanding jaws that form a cylinder. A threaded sleeve is screwed onto the lower end of the tool head, which receives the expanding jaws in a radially displaceable manner, so that they can be adjusted from a smallest Hull circle to a largest Hull circle. The tool head has a radial bore in which a conical control mandrel is slidably guided. Each of the expansion jaws is hen on the inside with a conical wedge surface verse ^¬, corresponding to the shape of the control pin. The control pin can be moved by a handle lever, while a second fixed handle lever extends from the tool head. To handle the tool, the control pin is pushed between the expanding jaws by the handle lever, so that they move apart concentrically and expand the pipe end.

The disadvantage of this solution is that the tube end is not expanded completely circularly due to the spaces between the expanding jaws. The resulting uneven shaping of the pipe end, especially on the inner wall, affects the function of the later pipe connection and can lead to leaks. The bumps can be offset by a second angular offset of the tool reduced, but not fully balanced. Except ^¬ we order a second step is required.

From US 3,412,592 an apparatus for expanding tube ends is known that zip the Prin ^¬ already described above, the spreading jaws uses, extending through the Langsverschie- bung of a mandrel with a conical surface move radially outwardly and thereby a widening of the pipe end cause. In this case, an expansion element is arranged in the interior of the tube, which likewise comprises clamping jaws with a conical inner surface which is pressed against the inner wall of the tube by displacing a cone. The jaws have grooves or serrations to increase the holding force inside the tube.

From the German patent DE 1214189 A, a ande ^¬ res tool for expanding a pipe end is known, the basic principle also is often used. The expansion takes place via an expansion cone, which enables a level expansion. The counterforce required for the expansion process is generated via a frictional connection between the tool and the pipe. For this purpose, two clamping blocks clamp the pipe on the outside at a distance from the end to be expanded. Modified solutions are designed as pliers and provide for the tube to be clamped between two clamping jaws. Since the frictional force of a smooth clamping block surface or a smooth clamping jaw surface would not be sufficient, these surfaces are serrated or serrated. The disadvantage of such solutions is that the corrugated or toothed clamping block or clamping jaw surface damages the surface of the tube during the expansion process. The force to expand requires a corresponding one Force for pressing the clamping blocks or the clamping jaws onto the pipe, which characterizes the corrugation or toothing in the surface of the pipe. The force for expanding the pipe often causes the pipe to move in the tool, so that the surface is damaged by machining. A particular disadvantage of these solutions is that the force required for clamping or clamping may have to be so great that the tube is permanently deformed at the clamping point.

GB 476 885 describes a device for producing pipe connections. The pipe end is widened manually with a mandrel, the device itself is an assembly aid and has a rubber clamping element, which can be radially expanded inside the pipe. This clamping element is used exclusively to seal the assembly point against gases or liquids in the pipe. This device offers the possibility of connecting pipes or providing fittings or the like, while the pipe itself is subjected to the pressure of a liquid or a gas.

The object of the present invention is therefore to provide a device for expanding pipe ends, which neither damages the shape nor the surface of the pipe and enables a round and uniform expansion of the pipe end.

This object is achieved by a device according to the appended claim 1. With the aid of a clamping element in the interior of the tube, at a distance from the end to be widened, a temporary frictional connection is created with the tube, which exerts the counterforce for introducing an expanding bolt into the end of the tube can. - A -

An essential advantage of the invention can be seen in the fact that when a one-piece expansion bolt is used at the pipe end, a very uniform deformation is achieved during the expansion process, with only a single expansion step. The expansion bolt can be adapted to the desired internal dimension of the expansion point and, in special cases, can also have a cross-sectional shape that deviates from the circular area if this is desired for a connection to be produced.

Another advantage of this invention is that the device is no more expensive to manufacture than known tools or devices.

In a preferred embodiment of the device according to the invention, the clamping element is designed as a hollow cylinder which is arranged on a tie rod between a first and a second retaining ring, while the first retaining ring is connected to the tie rod and the second retaining ring is connected to a pressure sleeve. By shifting the pressure sleeve against the pull rod, the elastic clamping element is squeezed between the retaining rings and deformed with an enlarged cross-section. Due to this deformation, the elastic element is pressed against the inside of the tube, so that there is a frictional connection with the tube.

In a modified embodiment, the elastic clamping element is made in several pieces and is arranged between further retaining rings. This increases the stability of the elastic clamping element and the frictional connection formed with the tube interior consists of several Partial connections that take up a larger contact surface with the inner pipe wall.

In a further embodiment of the device according to the invention, the clamping element is designed as a hollow cylinder, into which a truncated-cone-shaped bolt is inserted with the aid of the pull rod for deformation. The counterforce to the insertion of the bolt into the elastic element is absorbed by the retaining ring on the pressure sleeve.

In a further modified embodiment of the cross-sectional enlargement can gen the clamp via compressed air SUC ^¬ through which the clamping element is inflated in the manner of a balloon. In this case, the pull rod and pressure sleeve, which are movable relative to one another, can be dispensed with. This type of construction is particularly suitable if the drive is also pneumatic during expansion and thus compressed air is available at the device anyway. In a further embodiment, a clamping sleeve or a mandrel or the like can be provided on the outer wall of the tube in addition to the clamping element which can be expanded in cross section. This has the advantage that the distance between the clamping element and the expanding bolt can be reduced because the counterforce for the insertion of the expanding bolt is now applied by the clamping element and the clamping sleeve. The clamping sleeve can preferably be reduced in size and lies flat against the outer tube wall. A good absorption of the axial forces by the clamping element and clamping sleeve is achieved in that they are arranged outside and inside at the same axial position. This embodiment also enables smaller dimensions for , the clamping element is present as an additional force-compo ^¬ nent.

In a modified embodiment of the device, the manually or motor-generated force for deforming the elastic element is transmitted to the pressure sleeve via a lag screw, the counterforce being absorbed by the tie rod. In a preferred embodiment, the device is designed as pliers. The means for axially displacing the expanding bolt relative to the pull rod is formed by two lever arms which are operated manually. These two lever arms are preferably also used to shift the pressure sleeves to deform the elastic element.

In another preferred embodiment, the force for expanding the pipe end is exerted by a drill attached to the tool, a cordless screwdriver, a crank, a pneumatic rotary drive or the like. upset. The drive used preferably also serves to deform the elastic element.

In order to effect the expansion of the tube end after the tube has been tightened by expanding the elastic element inserted into the tube, a relative movement between the tube end and the expansion bolt must take place. For this purpose, the expanding bolt is displaced in the axial direction relative to the elastic element in order to penetrate into the pipe end.

Further advantages, details and further developments of the invention emerge from the following descriptions. ferred embodiments, gene with reference to the Zeichnun ^¬.

Show it:

1 shows a simplified illustration of a first embodiment of the device according to the invention in the form of hand-operated pliers;

2 shows a simplified illustration of a second embodiment, which is suitable for connection to a

Drill screwdriver or the like suitable;

FIG. 3 shows a detailed view of a ball guide head which is used in the embodiment according to FIG. 2; Fig. 4 is a detailed perspective view of an expanding bolt.

Fig. 1 shows a device Ol for widening a pipe end in an embodiment as a hand tool. The device has an expansion bolt 02, which has a conical attachment section and is preferably designed in one piece. A pull rod 03 and a pressure sleeve 04 are passed axially through the expanding bolt 02. The pressure sleeve 04 is slidably arranged on the pull rod 03. The expanding bolt 02 is slidably arranged on the pressure sleeve. The pull rod and the pressure sleeve are inserted into the pipe to be expanded (not shown) in order to attach the device. At the distal end of the pressure sleeve 04 there is a clamping element 06 which is variable in cross section and spaced from the expansion bolt 02. This element is preferably made of rubber or a similar elastic material and has a high coefficient of static friction. But it can also modified designs for the clamping element can be selected that allow a cross-sectional widening, for example cylinder sections that are displaceable on wedge surfaces and thereby change their radial position with respect to the axis of the drawbar.

In the in fing. 1 embodiment, the clamping element 06 is designed as a hollow cylinder and is dimensioned such that it can be inserted into the pipe to be expanded with almost full cross-section. The elastic clamping element 06 is arranged between a first retaining ring 07 and a second retaining ring 08. The retaining rings are also such that they can be imports into the aufzu ^¬ wide pipe nearly querschnittsfullend. This ensures that the elastic element is largely deformed by the retaining rings in the direction of the inner surface of the tube and that the deformation force is largely transmitted as a contact force between the elastic clamping element 06 and the inner surface of the tube. The first retaining ring 07 is connected to the pull rod 03, while the second retaining ring 08 is connected to the pressure sleeve 04. By moving the pull rod against the pressure sleeve, the distance between the retaining rings is reduced and the force for deforming the clamping element is applied. The pressure of the elastic clamping element 06 on the inside of the tube leads to a frictional connection between the tube and the tool. This connection applies the counterforce to the displacement force which is generated when the pipe end is expanded by inserting the expansion bolt into the pipe.

The device 01 shown in Fig. 1 is a hand tool with a rigid lever arm 09 and a movable lever arm

11 executed, handles are arranged at the ends, not shown. The rigid lever arm is equipped with a basic rigidly connected by 13. The pressure sleeve 04 including the pull rod 03 is guided in the basic body. The expanding bolt 02 is attached to the basic body. The expanding bolt is preferably attached to the base body in an easily detachable manner in order to allow an exchange for other expanding bolts with a different outside diameter. The conical end of the expanding bolt facing the pipe is adapted to the inside diameter of the pipe so that the expanding bolt can be easily inserted. The maximum external dimension of the expanding bolt is adapted to the desired cross-section of the pipe that is to be achieved by the expanding.

The movable lever arm 11 is connected to a pivot lever 12. The pivot lever is rotatably mounted on the pull rod 03 via a first bolt 14. Furthermore, the pivot lever is coupled to the pressure sleeve 04 via a cam drive 16. In order to bring the device 01 into the starting position, the lever arms are pivoted away from one another. In this position, the cam drive 16 does not cause any displacement of the pull rod 03 with respect to the pressure sleeve 04. In this position, no force acts on the retaining rings 07, 08 attached to the pull rod and on the pressure sleeve to deform the elastic clamping element 06. The clamping element is in this state into the dilated tube is ^¬ until the expanding bolt 02 abuts the tube end. If the movable lever arm is pivoted in the direction of the rigid lever arm, the distance from the axis of rotation of the pivot lever 12 in the first bolt 14 to the pressure sleeve 04 initially increases, so that the pull rod 03 m of the pressure sleeve is displaced. The lever force that occurs is transmitted to the elastic element 06 via the pull rod 03 and the pressure sleeve 04 as well as the retaining rings, so that the elastic element is deformed and a frictional connection with the tube is achieved Connection comes in. The cam drive 16 is designed in such a way that the pivoting movement of the lever arms only causes the pressure sleeves 04 to shift relative to the pull rod 03 during a first part of the total pivoting movement. When the first part of the swivel movement is completed, a circular section 17 of the swivel lever 12 acts with respect to the pressure sleeve 04. At the same time, a second bolt 18 strikes a stop edge 19 of an articulated lever 21. If the lever arms are pivoted further towards one another, the pivot lever 12 rotates in an axis of rotation in the second pin 18. Since the articulated lever 21 is rotatably mounted in the base body 12 with a third pin 22, the lever force between the lever arms now causes a pulling force on the pull rod 03 against the base body 12. Since the tie rod is frictionally connected to the pipe, the expanding bolt 02 is pressed into the pipe end. By Hebelverhaltnisse on Schwenkhe ^¬ bel 11 and the base body 12, a high force can be applied to the expanding bolt, so that hardly deformable pipes can be expanded by a Give the movable lever arm 11 on the rigid lever arm 09th Ratchet drives, toggle lever drives or other ratios known per se can be used to generate even higher forces.

After the expansion process has taken place, the lever arms 09, 11 can be pivoted away from one another again. The elastic element is thereby relaxed and the frictional connection to the tube is released, so that the device 01 can be removed from the tube again.

The counterforce to the expansion is absorbed exclusively by the frictional connection between the elastic element 06 and the tube. The large area in the pipe

Clamping element prevents damage to the inner surface of the Tube by pressing. Even if there is a slight displacement of the elastic clamping element 06 within the tube during the expansion process, the surface of the tube interior is not damaged. Since the pressing force of the clamping element acts concentrically on the inside of the pipe, deformation of the pipe by pinching or constriction is excluded. The clamping element is located at a sufficient distance from the expansion bolt 02 in the tube so that the deformation caused by the expansion of the tube does not affect the frictional connection between the elastic element 06 and the tube.

When expanding an already assembled pipe, there is often little space for attaching a tool in the outer region of the pipe end. Since the device according to the invention is placed inside the tube, such a space is not necessary here.

A particular advantage of the embodiment described above is that both the force for holding the pipe and the force for widening the pipe end are generated manually with the same lever arms 09, 11. In particular, only a single swiveling movement of the lever arms is required, by means of which the tool 01 is first applied and then the expansion process is effected. The generation of the force for deforming the cross-sectionally variable clamping element 06 can be done in other embodiments by manually pulling the pull rod or by another means, for. B. a lag screw can be applied. The force for deforming the clamping element can be metered with a lag screw. The device 01 can be replaced by exchanging fewer tool parts for the expansion of other pipe sizes, pipe types or be adapted to other expansion forms. To do this, first unscrew the first retaining ring 07 from the pull rod 03. The elastic element 06 and the second retaining ring 08 can then be pushed down from the pull rod. Since the expanding bolt 02 is attached to the base body 13, it can be pushed down by simply pulling it off the base body via the pressure sleeve 04 and the pull rod 03. Now the expanding bolts suitable for the desired expansion as well as the associated retaining rings and the associated elastic clamping element are to be mounted on the device in reverse order.

FIG. 2 shows a further preferred embodiment of the device according to the invention, which is now configured for driving by a drill screwdriver, a drilling machine or the like. The design of the expanding bolt 02, the cross-sectionally variable clamping element 06, the pull rod 03, the pressure sleeve 04 and the retaining rings 07, 08 corresponds to the embodiment shown in FIG. 1. Inside a housing 31 there are means for transmitting forces for deforming the clamping element 06 and for widening the pipe end. On the rear of the housing, a connection piece 32 of a shaft 33 is led out of the housing. The connecting piece 32 has a four- or six-sided or also a star-shaped cross section, in order to be able to safely transmit acting torques. For driving the shaft 33 via the connecting piece 32 a akkumulatorbe ^¬ exaggerated drill, a drill, a pressing pneumatic screwdriver or a similar tool can be used. If necessary, a crank can also be used for this. In the embodiment shown, the shaft 33 is mounted in the interior of the housing 31 in ball bearings 34. The shaft has a circumferential rim 36 which is between the spherical store 34 is guided and the shaft 33 secures against axial displacement. The shaft also has an external thread which is guided in an internal thread of a threaded spindle 37. The threaded spindle is secured against rotation in the housing 31 by a groove. A ball guide head 38 is screwed onto the threaded spindle and is described in more detail below. The ball guide head is arranged within a ball guide sleeve 39, which has a circumferential, inclined ball guide edge 41. A plurality of balls 43 are guided between the ball guide head 38, the ball guide edge 41 and an end face 42 of the pressure sleeve 04. The tie rod 03 is Untitled buildin ^¬ on Kugelfuhrungskopf 38th

To apply the embodiment of the device shown in FIG. 2, the pull rod 03 with the elastic or cross-sectionally variable clamping element 06 is inserted into the tube to be expanded until the expansion bolt 02 is at the end of the tube. The shaft 33 is then driven via its connecting piece 32, so that the threaded spindle 37 moves in the direction of the connecting piece 32. At the beginning, the balls 43 are arranged such that the pressure sleeve 04 is not displaced with respect to the pull rod 03. Due to the displacement of the threaded spindle, the ball guide head 38 is also moved relative to the ball guide sleeve 39. The balls 43 are increasingly guided between the ball guide head 38 and the end face ^¬ side 42 of the pressure sleeve due to the oblique ball guide, so that the pressure sleeve 04 is displaced relative to the pull rod 03. This displacement of the pressure sleeve against the pull rod deforms the clamping element 06 and creates a frictional connection with the inside of the pipe. With a subsequent feed of the threaded spindle 37, the pull rod 03 is over the Ball guide head 38, over the threaded spindle, over the shaft 33 and the housing 31 moved against the expanding bolt 02. Since the tool is already frictionally connected to the pipe, the expanding bolt 02 is pressed into the pipe end. After the expansion process has taken place, the shaft 33 is to be driven in the opposite direction of rotation via the connecting piece 32. As a result, the Gewmdespmdel 37 moves back and all other parts back to their starting positions. The frictional connection with the pipe is released and the tool can be removed.

FIG. 3 shows a detailed view of the ball guide head 38 of the embodiment of the device 01 according to the invention shown in FIG. 2. The ball guide head has an external thread 46, which is used to fasten the threaded spindle 37. The pull rod 03 is attached to a shoulder 47 of the ball guide head. A continuous internal thread 48 is used for this purpose. Ball guide shells 49 are used to guide the balls 43.

Fig. 4 shows a detail view of the Aufweitbolzens 02 in Fig. 1 and 2 embodiments shown the inventiveness gemaßen device 01. The expanding bolt 02 is preferably of emstuckig and has a conical Ansetzab ^¬ section 51. To carry out the draw bar 03 and the pressure sleeve 04, the expanding bolt has a continuous opening 52. To attach the expanding bolt to the base body 13 or to the housing 31, the expanding bolt has a socket-like extension 53. Reference list

01 Device for expanding pipe ends

02 expanding bolts

03 pull rod

04 Druckhulse

05 -

06 (elastic) clamping element

07 first retaining ring

08 second retaining ring

09 rigid lever arm

10 -

11 movable lever arm

12 swivel levers

13 basic body

14 first bolt

15 -

16 cam drive

17 circular section of the cam drive 18 second bolt

19 stop edge

20 -

21 articulated lever

22 third bolt

30 -

31 housing

32 connector

33 wave

34 ball bearings

35 -

36 wreath

37 threaded spindle 38 ball guide head

39 ball bearing sleeves

40 -

41 ball guide edge

42 face of the pressure sleeve

43 balls

44 -

45 -

46 external thread

47 Approach to the ball guide head

48 internal thread

49 ball bearing shells

50 -

51 attachment section

52 opening

53 Approach to the expanding bolt

Claims

1. Device (Ol) for expanding pipe ends with

- An expansion bolt (02) which can be inserted into the pipe end for cross-sectional expansion;

- A cross-section expandable clamping element (06) which is arranged axially spaced from the expanding bolt (02) and can be inserted into the tube in the non-cross-sectional expanded state;

a means for introducing a force onto the clamping element (06) in order to expand its cross-section to such an extent that it is clamped in the tube,

characterized in that

- It further comprises a means for axially displacing the expanding bolt (02) relative to the clamping element (06) clamped in the tube in order to press the expanding bolt (02) into the tube end and thereby widen its cross section, and that

- In the clamped state, the clamping element (6) can initiate a tensile force that occurs when the pipe end is widened, essentially without axial change in position in the pipe.

2. Device according to claim 1, characterized in that the expanding bolt (02) is made in one piece.

3. Device according to claim 1 or 2, characterized in that the expanding bolt (02) has at least one conical front attachment section (51), the outer diameter of which at the narrowest point is smaller than the inner diameter of the pipe end to be expanded

4. Device according to one of claims 1 to 3, characterized in that the means for introducing a force onto the clamping element (06) comprises a pull rod (03) and a pressure sleeve (04) guided thereon, each axially through the expanding bolt ( 02) are guided, the clamping element (06) being connected to the pull rod (03), and a relative displacement between the pull rod (03) and the pressure sleeve (04) leading to the reversible cross-sectional expansion of the clamping element (06).

5. The device (01) according to claim 4, characterized in that the clamping element (06) is designed as an elastic hollow cylinder which is guided on the pull rod (03), and that on the pull rod (03) a first retaining ring (07) and a second retaining ring (08) is attached to the pressure sleeve (04), which engage on the end faces of the clamping element (06) and press it together by a displacement between the pull rod (03) and pressure sleeve (04).

6. The device (01) according to claim 5, characterized in that the elastic clamping element (06) is made in several parts and further retaining rings are arranged between its parts.

7. The device (01) according to claim 4, characterized in that the clamping element (06) is designed as an elastic hollow cylinder, and that on the pull rod (03) a truncated cone-shaped bolt and on the pressure sleeve (04)

Retaining ring (08) are attached, wherein the frustoconical pin is arranged protruding into the elastic hollow cylinder, and the largest diameter of the frustoconical pin is larger than the inner diameter of the hollow cylinder.

8. Device (Ol) according to one of claims 3 to 7,

characterized in that the pull rod (03) is connected to the pressure sleeve (04) via a tension screw.

9. Device (Ol) according to one of claims 1 to 7,

characterized in that the driving forces for the means for introducing a force onto the clamping element (06) and for the means for displacing the expanding bolt (02) can be introduced via two lever arms (09, 11).

10. The device (01) according to claim 9, characterized in that the pressure sleeve (04) is connected to one of the lever arms (09, 11) and in a first section

Swiveling movement of the lever arms (09, 11) against the

Drawbar is moved. 11. The device (01) according to claim 10, characterized

characterized in that the pressure sleeve (04) with the

Drawbar (03) is connected via a cam drive (16) which is actuated by the lever arms (09,

11) is driven.

12. The device (01) according to claim 10 or 11, characterized

characterized in that the lever arms (09, 11) are connected via an articulated lever (21) which, in a second section of the pivoting movement of the lever arms (09, 11), has an axis of rotation for the pivoting movement on a

Forming stop edge (19).

13. Device (Ol) according to one of claims 1 to 7, characterized in that the means for displacing the expanding bolt (02) is driven via a connecting piece (32) of a shaft (33), the connecting piece (32) being driven through a drill, a drill, a crank or a similar drive means is driven.

14. The device (Ol) according to claim 13, characterized in that the means for displacing the expanding bolt (02) is further formed by a threaded spindle (37) connected to the pull rod (03), which is connected to an external thread the expanding bolt (02) verbun ^¬ which shaft (33) runs.

15. The device (01) according to claim 13 or 14, characterized

characterized that the means of postponing the

Expanding bolt (02) in a first step also ^¬ if the pressure sleeve (04) moves relative to the pull rod (03).

16. The device (01) according to claim 15, characterized in that the means for displacing the expanding bolt

(02) further comprises a ball guide head (38) connected to the threaded spindle (37) and the pull rod (03) with obliquely arranged ball guide shells (49), a plurality of balls (43) and a ball guide sleeve (39) with a circumferential oblique ball guide edge (41) ; the balls (43) being arranged between the ball guide sleeve (39), the ball guide shells (49) and an end face (42) of the pressure sleeve (04); and that in a starting position the balls (43) are arranged in such a way that the pressure sleeves (04) are opposite the pull rod (03) is not shifted; and that, for a displacement ^¬ the Kugelfuhrungskopfes the balls bung (38) opposite the ball fuhrungshulse (39) (43) owing to the oblique Kugelfuhrung increasingly between the Kugelfuhrungskopf (38) and the end face (42) of Druckhulse (04) are guided and so the pressure sleeve (04) opposite the tie rod

(03) is moved.

17. The device (01) according to one of claims 1 to 16,

characterized in that a clamping sleeve is further provided, which is arranged axially spaced from the expanding bolt (02) on the outside of the tube.

18. The device (01) according to claim 17, characterized in that the clamping sleeve can be made cross-sectionally.