Tool and method for shortening a pipe section

Abstract

Tool (30) for shortening a pipe section (10) with a thread (18) having at least one predetermined breaking point (20), in particular a drain of a wall plate (2), - with a first threaded rod (32) with a first threaded section (34) and - with a second threaded rod (36) with a second threaded section (38), - wherein the second threaded rod (36) has a continuous, preferably round or polygonal, opening, in particular a bore (40) for receiving the first threaded rod (32) and the first threaded rod (32) and the second threaded rod (36) are axially displaceable from each other, - wherein in a first position of the threaded rods (32, 36) the first threaded section (34) and the second threaded section (36) are arranged adjacent to each other and - wherein in a second position of the threaded rods (32, 36) the first threaded section (34) and the second threaded section (38) are pulled apart and spaced apart from each other.

Description

[0001] The invention relates to a tool for shortening a pipe section with a thread having at least one predetermined breaking point, particularly in the case of a wall plate. Furthermore, the invention relates to a method for shortening a pipe section with a thread having a predetermined breaking point, particularly in the case of a wall plate.

[0002] Water pipes supplying taps or similar fixtures are typically installed as pipes between a wall and a partition wall. This is particularly necessary during renovations to allow for the installation of water pipes without major alterations to the masonry.

[0003] The same problem arises when installing a pipe that is to be connected to a fitting located in a recess in a wall, and where the wall is subsequently to be tiled. Here, too, a gap must be bridged between the fitting and the tiled surface of the wall.

[0004] Wall plates serve to provide a future connection point for fittings, valves, pipes, or similar components. The wall plate is attached to the existing wall, and its inlet is connected to a supply line, such as a water pipe. The component to be supplied is connected to the outlet, which typically points at a right angle from the wall, similar to a fitting, allowing the medium, for example, water, to flow from the supply line into the wall plate and from the wall plate into the component.

[0005] Nowadays, wall plates with short threaded pipe sections are regularly used as drains. During the final installation of water connections, the threaded connection of the wall plate usually needs to be extended so that it sits flush with the wall.

[0006] Tap extensions are typically used for this purpose. To ensure the tradesperson always has the right tap extension readily available on the construction site, a wide range of different length increments is necessary. Furthermore, installing the tap extension creates an additional sealing point between the wall plate and the tap extension, which is neither visible nor inspectable.

[0007] Furthermore, wall plates with a long pipe section can also be used as a drain with thread, which is shortened during fine installation with a countersinking cutter for a drill or cordless screwdriver.

[0008] Since the shortening is carried out during the final installation, there is a risk of damaging the new tiles. This is because, firstly, metal shavings are produced during the shortening process, and secondly, the pipe section must be cut flush with the tile using the milling head, which poses a high risk of damage.

[0009] Wall panels of this type are known from US 2022 / 0186865 A1 and US 2007 / 0241563 A1.

[0010] Therefore, the present invention is based on the technical problem of being able to shorten a pipe section with a thread and at least one predetermined breaking point, in particular drains of wall plates with threaded fittings, without cutting.

[0011] The aforementioned technical problem preferably relates to a wall plate for connecting a component to be supplied with water, with a mounting flange for attaching it to a wall, with at least one inlet for connection to a supply line and with at least one outlet for connection to the component to be supplied, wherein the outlet is provided with a thread, characterized in that the outlet has at least a partially, preferably completely, circumferential recess as a predetermined breaking point at at least one axial position.

[0012] The wall plate can be configured with just one inlet and one outlet. Alternatively, it can also be configured as a double wall plate or as a wall plate T-piece.

[0013] The thread is preferably designed as an internal thread, since the known fittings usually have an external thread on the connection spigot.

[0014] Preferably, the at least one predetermined breaking point is formed by an internally formed groove and / or an externally formed groove. The groove(s) can be designed as V-shaped notches.

[0015] The wall plate described above has the advantage that when the threaded section is cut to length by separating at least one of the designated contact points, no chips are formed and there is no risk of damaging already installed tiles. Furthermore, tap extensions are no longer necessary for the final installation, thus eliminating the need for an additional sealing point in the wall.

[0016] The internally formed groove thus preferably creates an internal chamfer on the thread. The chamfer angle corresponds at least to the thread flank angle and, in particular according to DIN EN 10226-1, is approximately, preferably at most, one thread deep. The chamfer angle can range between 45° and 27.5°.

[0017] Furthermore, it is preferred that the internally formed groove be at least 0.1 mm, preferably at least 0.2 mm deeper than the thread root, in order to ensure a defined shearing off at the predetermined breaking point and not at a thread turn.

[0018] Furthermore, it should be noted that the deeper the external groove, the greater the stress concentration at the predetermined breaking point. However, when using copper alloys, this groove must not reduce the minimum wall thickness according to EN 1254-20. For wall plates with a ½ inch diameter, this minimum wall thickness is 1.2 mm.

[0019] The internal and / or external grooves preferably have a triangular cross-section to maximize stress in the predetermined breaking point. To further maximize the notch effect at the predetermined breaking point, it is advantageous for the groove to be as pointed as possible. For improved manufacturability, a rounding at the predetermined breaking point is possible, preferably no greater than the rounding of the thread crests, for example, approximately R2.5.

[0020] The spacing between each pair of predetermined breaking points must be selected to ensure compliance with the minimum thread lengths specified in DIN EN 10226-1 and ISO 7-1. For the preferred dimension of ½ inch diameter wall plates, the distance between two predetermined breaking points, or the minimum thread length, is 9.2 mm. Based on the requirements for minimum thread length, recommended groove depth, and chamfer angle, a predetermined breaking point spacing of at least 10 mm, preferably 10.5 mm, is required.

[0021] Furthermore, it can be considered that for a defined break at the predetermined breaking point and for a good surface finish on the fracture edge after breaking, a material with low elongation at break that allows for brittle fracture is advantageous. This requirement is particularly well met by cast materials.

[0022] The technical problem described above is solved by a tool for shortening a pipe section with a thread having at least one predetermined breaking point, in particular shortening a drain of a previously described wall plate, with a first threaded rod having a first threaded section and with a second threaded rod having a second threaded section, wherein the second threaded rod has a through opening, preferably round or polygonal, in particular a bore for receiving the first threaded rod and the first threaded rod and the second threaded rod are axially displaceable relative to each other, wherein in a first position of the threaded rods the first threaded section and the second threaded section are arranged adjacent to each other and wherein in a second position of the threaded rods the first threaded section and the second threaded section are pulled apart and spaced apart from each other.

[0023] By screwing the two threaded rods into the pipe section, the predetermined breaking point can be torn open and a distal part of the pipe section torn off by pulling out the second threaded rod.

[0024] Preferably, the first and second threaded rods assume a predetermined azimuthal angular position relative to each other. This prevents the two threaded rods from rotating against each other, allowing the two adjacent threaded sections to be aligned and arranged in a straight line. Possible embodiments include a flattened inner part and a corresponding counter-profile on the outer part, or an axially extending projection that is guided in a groove.

[0025] The tool's functionality is ensured when the two threaded sections of the first and second threaded rods are screwed in to such a depth that the first threaded section is located on the proximal side and the second threaded section on the distal side of the predetermined breaking point. Preferably, a stop element is provided for this purpose, which is slidably attached to the outside of the second threaded rod. The stop element can be positioned and secured at predetermined axial positions, allowing the tool to be screwed in until the stop element reaches its stop at the distal end of the pipe section. Once the stop is reached, the two threaded sections are screwed in to the required depth.

[0026] An alternative to the stop element is for the second threaded rod to have at least one marking on its outer surface that is at least partially circumferential. The tool can then be screwed in up to this mark, so that both threaded sections are screwed in to the required depth.

[0027] In the described embodiments, the first and second threaded rods are made of a material with a higher strength than the material of the drain with the internal thread. This ensures reliable tearing of the drain at the predetermined breaking point.

[0028] The described tool preferably includes a force generator for generating a shearing force to pull apart the first and second threaded rods. The force generator transmits the force required to break the predetermined breaking point to the two threaded rods by pulling them apart and, during this process, transferring the breaking force to the predetermined breaking point.

[0029] The power generator can be designed in different ways and, for example, generate the required force through a press machine, a spindle drive or a lever arm.

[0030] In a first embodiment, the power generator has a housing connected to the second threaded rod, wherein an output wedge is slidably arranged in the housing and rests against the first threaded rod, preferably connected to the first threaded rod, and wherein a drive wedge is provided for transmitting an externally exerted pressing force into a linear movement of the output wedge.

[0031] Preferably, the drive wedge is movable from a starting position to an end position essentially perpendicular to the sliding direction of the output wedge, and the output wedge and the drive wedge have contact surfaces that extend obliquely to the direction of movement of the output wedge and obliquely to the sliding direction of the drive wedge. The angle α between the sliding direction of the drive wedge and the obliquely extending contact surface can be less than 45°, in particular less than 20°, preferably less than 10°. An angle range of 2.5° to 10° is particularly preferred.

[0032] The inclined surfaces transfer the movement of the drive wedge to the driven wedge. Depending on the predetermined angle, the pressing force exerted on the drive wedge is amplified and transmitted as a force to the driven wedge, whereby the magnitude of the displacement of the driven wedge is smaller than the magnitude of the adjustment of the drive wedge.

[0033] The described force generator enables a force transmission via the drive wedge, starting from a smaller force, which is transmitted to the drive wedge via a larger adjustment range of a press jaw, into a smaller sliding range with a larger sliding force. This force transmission is particularly advantageous when separating a section of pipe, as this requires a large force with only a short adjustment range.

[0034] Furthermore, a preload spring is preferably provided for returning the drive wedge to its starting position, which is arranged in the housing.

[0035] To ensure proper application of the pressing force to the drive wedge, contact surfaces for the press jaw halves are provided on the outside of the housing and on the outside of the drive wedge. These preferably have a round, dome-like shape into which correspondingly round press jaw sections engage. The round shape allows the press jaw to be positioned at different angles relative to the housing, thus simplifying the positioning and operation of the tool.

[0036] In a further embodiment, the force generator has a first lever and a second lever which are connected to each other by a joint, wherein the first lever has a first force transmission surface for contact with a bearing surface formed on the first threaded rod and a first contact surface for contacting a first press jaw half, wherein the second lever has a second force transmission surface for contact with a bearing surface formed on the second threaded rod and a second contact surface for contacting a second press jaw half, and wherein the distance of the force transmission surfaces to the joint is shorter than the distance of the contact surfaces to the joint.

[0037] Thus, in this design of the power generator, a force transmission is achieved from the pressing force exerted by the press jaw halves to an increased force on the contact surfaces of the threaded rods with a shorter adjustment path of the threaded rods.

[0038] The technical problem outlined above is also solved by a method for shortening a pipe section with a thread having a predetermined breaking point, in particular a section of a wall plate described above, in which a previously described tool is used, in which the first threaded section of the first threaded rod and the second threaded section of the second threaded rod are positioned close to each other, preferably in contact with each other, in which the tool is screwed into the pipe section to such an extent that the axial position of the distal end of the first threaded section is positioned at least as deep as the axial position of the predetermined breaking point of the pipe section and that the axial position of the proximal end of the second threaded section is positioned less deep than the axial position of the predetermined breaking point of the pipe section.in which the second threaded rod is moved axially out of the pipe section relative to the first threaded rod, and in which the pipe section is torn off at the predetermined breaking point by the movement of the second threaded rod relative to the first threaded rod.

[0039] Through the interaction of the two threaded rods with sections of the thread arranged on both sides of one of the predetermined breaking points, and through the relative movement of the threaded rods, a sufficiently large force is exerted over a short distance to tear open the material in the area of ​​the predetermined breaking point and to enable separation.

[0040] Preferably, the penetration depth of the threaded section of the first threaded rod and the threaded section of the second threaded rod is determined by positioning a stop element, and the tool is screwed in until the stop element rests against the front end of the pipe section. This ensures, in a simple manner, that the two threaded rods are correctly positioned.

[0041] Alternatively, a mark on the second threaded section can be used to determine the screw-in depth. This ensures the correct positioning of the two threaded rods purely visually.

[0042] The invention will now be explained using exemplary embodiments with reference to the drawing. The drawing shows... Fig. 1 a wall panel attached to a wall, Fig. 2 the wall panel from Fig. 1 with an additional pretext, Fig. 3 the wall panel from Fig. 2 with a screw-in tool for shortening the drain of the wall plate, Fig. 4 the wall panel from Fig. 3 with a detached section after the abbreviation, Fig. 5 the wall panel from Fig. 4 with a shortened process, Fig. 5a the wall panel with a two-layer pre-wall with tile covering, Fig. 6 the wall panel from Fig. 5 with a mounted fitting, Fig. 7 the tool for shortening the drain of the wall plate Fig. 3 in an enlarged view, Fig. 8 the tool after Fig. 7 in a first cross-section with a first force generator for generating a displacement force to pull apart the first threaded rod and the second threaded rod, Fig. 9 the tool after Fig. 8 in a second cross-section in a starting position, Fig. 10 the tool after Fig. 9 in a final position, Fig. 11 the tool according to the Fig. 8 and Fig. 9 in a perspective side view with attached pressing tool, Fig. 12 a schematic representation of the tool with power generator and attached press jaw half according to Fig. 10 with the acting forces, Fig. 13 the tool after Fig. 7 with a second power generator in a starting position and Fig. 14 the tool after Fig. 13 in the final position.

[0043] In the following description of the various embodiments according to the invention, components and elements with the same function and mode of operation are provided with the same reference numerals, even if the components and elements may differ in their dimensions or shape in the various embodiments.

[0044] Fig. Figure 1 shows a wall plate 2 for connecting a component requiring a water supply. The wall plate 2 has a mounting flange 4 for attachment to a wall 6 and connects an inlet 8 to an outlet 10 for connection to the component requiring a water supply. The inlet 8 is connected to a supply line 12 by means of a press fitting 14 and an O-ring 16 and is generally used for conveying water. Of course, any other fluid can also be conveyed using the wall plate.

[0045] The outlet 10 is designed as a pipe section with a thread 18, which is designed as an internal thread and which serves to screw in a threaded section with an external thread of the component to be supplied.

[0046] How Fig. As shown in Figure 1, the process 10 has a circumferential recess 20 at two axial positions, serving as a predetermined breaking point. The predetermined breaking points 20 are formed by an internally formed groove 22 and an externally formed groove 24.

[0047] Fig. Figure 2 shows the formation of a partition wall 26, which has been installed at a distance from the wall 6, with the drain 10 protruding through an opening 28.

[0048] Fig. Figure 3 further shows a tool 30 for shortening the run 10 of a wall disc 2 according to the Fig. 1 and Fig. 2. The tool 30 has a first threaded rod 32 with a first threaded section 34 and a second threaded rod 36 with a second threaded section 38. Furthermore, the second threaded rod 36 has a bore 40 for receiving the first threaded rod 32, and the first threaded rod 32 and the second threaded rod 36 are axially displaceable relative to each other.

[0049] In a first position of the threaded rods 32 and 36 according to Fig. In the first threaded section 34 and the second threaded section 38 are arranged adjacent to and aligned with each other so that both threaded sections 34 and 38 can be screwed into the same thread 18 one after the other. In the first position, the two threaded sections 34 and 38 are abutting each other.

[0050] The threaded rods 32 and 36 are screwed into the thread 18 of the drain 10 to such an extent that the threaded section 34 is located proximal to the predetermined breaking point 20 and the threaded section 38 is located distal to the predetermined breaking point 20. The point of contact between the two threaded sections 34 and 38 is therefore located in the area of ​​the predetermined breaking point 20.

[0051] Starting from the first position, the first threaded rod 32 and the second threaded rod 36 are moved apart, as indicated by the two arrows. The second threaded rod 36 is pulled out relative to the first threaded rod 32 and brought into a second position, as shown in Fig. Figure 4 shows that by pulling apart the two threaded rods 32 and 36, the pipe section of the drain 10 is split or torn off at a circumferential predetermined breaking point 20, so that a shortened drain 10a is created and the torn-off part 10b can be removed with the second threaded rod 26.

[0052] Fig. Figure 4 shows the second position of the threaded rods 32 and 36, in which the first threaded section 34 and the second threaded section 38 are pulled apart and spaced apart from each other.

[0053] Fig. Figure 5 shows the wall panel 2 after the removal of the separated part 10b and the removal of the tool 30. The front end of the drain 10 protrudes only slightly from the opening 28, so the wall panel 2 has been adapted to the installation depth of the wall 26.

[0054] Fig. Figure 5a shows an alternative configuration of the pre-wall 26 with two layers 26a and 26b, the second layer 26b being a layer of tiles. In this case, the front end of the drain 10 is flush with the surface of layer 26b.

[0055] In this configuration, the wall plate 2 with the long pipe section 10 offers advantages for creating the composite seal in shower and bathtub areas. Here, it is possible to seal directly onto the threaded connection of the pipe section 10 using an expansion joint sleeve 26c. When installing with a wall plate with a short thread and a tap extension, additional sealing measures would be necessary, such as the installation of an additional sealing sleeve.

[0056] Fig. Figure 6 finally shows the fully assembled and adapted wall plate 2 with an attached component in the form of a tap 42, which is supplied with water from the supply line 12 via the inlet 8 and the outlet 10.

[0057] Fig. Figure 7 shows the previously described tool 30 with the first threaded rod 32 and the second threaded rod 36 in cross-section. In addition to the previous illustration, a stop element 44 is provided, which is slidably attached to the outside of the second threaded rod 36. The stop element 44 can be positioned and fixed by means of a fastening screw (not shown). The stop element 44 allows the depth to be determined by which the first threaded rod 32 and the second threaded rod 36 are screwed into the thread 18 to ensure that one of the predetermined breaking points 20 is opened. Another possibility is that the stop element 44 is fixed by means of a detent function using a spring-loaded pressure piece and a corresponding recess for the engagement of the pressure piece.

[0058] In the Fig. Figures 8 to 10 show a tool 30 comprising a first threaded rod 32, a second threaded rod 36, and a stop element 44. A force generator 100 is also provided for generating a displacement force to pull apart the first threaded rod 32 and the second threaded rod 36. The force generator 100 has a housing 102 connected to the second threaded rod 36 and an interior chamber 104. Furthermore, an output wedge 106 is slidably arranged in the interior chamber 104, and thus in the housing 102, and is positively connected to the first threaded rod 32. Additionally, a drive wedge 108 is provided for transmitting an externally applied pressing force into a linear movement of the output wedge 106.

[0059] In the Fig. Figure 8 shows a cross-section in which the drive wedge 106 is moved perpendicular to the plane of the drawing when the pressing force is applied. Fig. 9 and Fig. Figure 10 shows a cross-section in a view perpendicular to the Fig. 8. Thus, when a pressing force is applied, the drive wedge 106 moves from top to bottom and therefore essentially perpendicular to the sliding direction of the output wedge 106 from a starting position ( Fig. 9) into a final position ( Fig. 10) is movable.

[0060] The output wedge 106 and the drive wedge 108 have contact surfaces 110 and 112 that extend obliquely to the direction of movement of the output wedge 106 and obliquely to the sliding direction of the drive wedge 108. The angle α between the sliding direction of the drive wedge 108 and the obliquely extending contact surface 112 is less than 20°, preferably less than 10°.

[0061] For attaching a press jaw (see below) Fig. 11) The two sides of the drive wedge 108 have rounded contact surfaces 114 and 116. Furthermore, the housing 102 consists of a cup-shaped part 102a and a cover 102b. Preferably, a preload spring (not shown) is also provided for returning the drive wedge 108 to its initial position.

[0062] The force exerted by the drive wedge 108 on the output wedge 106 causes the output wedge 106 to displace relative to the housing 102. This, in turn, leads to a relative movement between the first threaded rod 32, which is connected to the output wedge 106, and the second threaded rod 36, which is connected to the housing. Fig. Figure 10 shows the two ends of the thread sections 34 and 38 spaced apart.

[0063] In the application of the tool 100 with a stationary wall plate 2 as described above, the housing 102 is removed from the wall plate 2 together with the second threaded rod 36, and the first threaded rod 32 remains stationary and connected to the wall plate 2, as described above. The force transmitted by the output wedge 106 thus causes the thread 18 of the drain 10 to shear off at the predetermined breaking point 20.

[0064] Fig. Figure 11 shows the described power generator 100 in a perspective view with an attached press jaw 150, which has two press jaw halves 152 and 154. The press jaw halves 152 and 154 are attached to a bracket 160 by means of joints 156 and 158 and have attachment elements 162 and 164 at their front ends. The attachment elements 162 and 164 have a dome-shaped, round form that corresponds to the attachment surfaces 114 and 116 of the drive wedge 108. Due to their rounded shape, the press jaw halves 152 and 154 can be attached to the drive wedge 108 at different angles and then actuated.

[0065] The press jaw 150 is actuated by a press machine (not shown), which is known per se and can advance a piston hydraulically or electrically. Fig. 11 from right to left. At the end of the piston are two rollers that roll along the inner surfaces 166 and 168 of a so-called entry contour, thus pushing the press jaw halves 152 and 154 apart as the piston advances. This pushing apart causes the attachment elements 162 and 164 to be compressed, thereby exerting the pressing force on the drive wedge 108.

[0066] Fig. Figure 12 schematically shows the forces exerted in the previously described arrangement. The piston (not shown) moves a distance dx1 from right to left and exerts a horizontally acting force F1 (see arrows), which causes the press jaw halves 152 and 154 to pivot. This pivoting movement creates a Fig. Figure 11 shows a force F2, represented vertically by an arrow, generated while the attachment element 162 moves a distance dx2. Here, dx2 is smaller than dx1 and the force F2 is greater than F1.

[0067] The inclined surfaces 110 and 112 transmit the movement of the drive wedge 108 to the output wedge 106, with the surfaces 110 and 112 sliding over one another. Depending on the predetermined angle α, the pressing force exerted on the drive wedge 108 is amplified and transmitted as force F3 to the output wedge 106, such that F3 is greater than F2. Furthermore, the magnitude of the displacement dx3 of the output wedge 106 is smaller than the magnitude of the adjustment dx2 of the drive wedge 108.

[0068] The described force generator 100 thus enables a force transmission via the drive wedge 108, starting from a smaller force, which is transmitted to the drive wedge 108 via a larger adjustment travel of a press jaw, into a smaller sliding travel with a larger sliding force. This force transmission is particularly advantageous in the described cutting of a section of a pipe, since this requires the application of a large force with only a short adjustment travel.

[0069] The in Fig. The 12 arrows shown are not to scale, but merely indicate the direction of movement and force application. Depending on the dimensions of the individual components, a transmission ratio for F1:F3 of 1:10 to 1:30 or more can be achieved.

[0070] In the Fig. 13 and Fig. Figure 14 shows a further embodiment of a force generator 200, which has a first lever 202 and a second lever 204 connected to each other by a joint 206. The first lever 202 has a first force transmission surface 208 for bearing against a contact surface 35 formed on the first threaded rod 32 and a first engagement surface 210 for engaging a first press jaw half 152 of a press jaw 150. Furthermore, the second lever 204 has a second force transmission surface 212 for bearing against a second contact surface 39 formed on the second threaded rod 36 and a second engagement surface 214 for engaging a second press jaw half 154 of a press jaw 150. Furthermore, the distance of the force transmission surfaces 208 and 212 to the joint 206 is shorter than the distance of the contact surfaces 210 and 214 to the joint 206.

[0071] In Fig.Figure 13 shows the starting position with adjacent threaded sections 34 and 38 and the open press jaw 150. Applying a force to the press jaw, labeled F1 and dx1, generates a greater force F2 with a smaller displacement dx2. Again, the arrows shown are symbolic; the transmission ratio F1:F2 can take values ​​from 1:2 to 1:30.

Claims

[1] Tool (30) for shortening a pipe section (10) with a thread (18) having at least one predetermined breaking point (20), in particular a drain of a wall plate (2), - with a first threaded rod (32) with a first threaded section (34) and - with a second threaded rod (36) with a second threaded section (38), - wherein the second threaded rod (36) has a continuous, preferably round or polygonal, opening, in particular a bore (40) for receiving the first threaded rod (32) and the first threaded rod (32) and the second threaded rod (36) are axially displaceable from each other, - wherein in a first position of the threaded rods (32, 36) the first threaded section (34) and the second threaded section (36) are arranged adjacent to each other and - wherein in a second position of the threaded rods (32, 36) the first threaded section (34) and the second threaded section (38) are pulled apart and spaced apart from each other. [2] Tool according to claim 1, characterized by , - that a stop element (44) is provided and - that the stop element (44) is slidably attached to the outside of the second threaded rod (36). [3] Tool according to claim 1 or 2, characterized by , that a force generator (100; 200) is provided for generating a displacement force to pull apart the first threaded rod (32) and the second threaded rod (36). [4] Tool according to claim 3, characterized by , - that the power generator (100) has a housing (102) connected to the second threaded rod (36), - that an output wedge (106) is slidably arranged in the housing (102) and rests against the first threaded rod (32), - that a drive wedge (108) is provided to transmit an externally applied pressing force into a linear movement of the output wedge (106), - that the drive wedge (108) is movable essentially perpendicular to the sliding direction of the output wedge (106) from a starting position to an end position and - that the output wedge (106) and the drive wedge (108) have contact surfaces (110, 112) that run obliquely to the direction of movement of the output wedge (106) and obliquely to the sliding direction of the drive wedge (108). [5] Tool according to claim 4, characterized by , that an angle (α) between the sliding direction of the drive wedge (108) and the inclined contact surface (112) is less than 45°, in particular less than 20°, preferably less than 10°. [6] Tool according to claim 4 or 5, characterized by, that contact surfaces (114, 116) for press jaw halves are formed on the outside of the housing (102) and on the outside of the drive wedge (108). [7] Tool according to claim 3, characterized by , - that the power generator (200) has a first lever (202) and a second lever (204) which are connected to each other by a joint (206), - that the first lever (202) has a first force transmission surface (208) for contact with a contact surface (35) formed on the first threaded rod (32) and a first contact surface (210) for contacting a first press jaw half, - that the second lever (204) has a second force transmission surface (212) for contact with a contact surface (39) formed on the second threaded rod (36) and a second contact surface (214) for attaching a second press jaw half and - that the distance of the force transmission surfaces (208, 212) to the joint (206) is shorter than the distance of the contact surfaces (210, 214) to the joint (206). [8] Method for shortening a pipe section having a thread (18) having a predetermined breaking point (20), in particular a drain of a wall plate (2), - in which a tool (30) according to one of claims 1 to 7 is used, - wherein the first threaded section (34) of the first threaded rod (32) and the second threaded section (38) of the second threaded rod (36) are positioned close to each other, preferably in contact with each other, - where the tool (30) is screwed into the pipe section to such an extent, -- that the axial position of the distal end of the first threaded section (34) is positioned at least as deep as the axial position of the predetermined breaking point (20) of the pipe section and -- that the axial position of the proximal end of the second threaded section (38) is positioned less deep than the axial position of the predetermined breaking point of the pipe section, - in which the second threaded rod (36) is moved out of the pipe section in an axial direction relative to the first threaded rod (32) and - in which the pipe section is torn off at the predetermined breaking point (20) by the movement of the second threaded rod (36) relative to the first threaded rod (32). [9] Method according to claim 8, - in which the penetration depth of the first threaded section (34) of the first threaded rod (32) and of the second threaded section (38) of the second threaded rod (36) is determined by positioning a stop element (44) and - in which the tool (30) is screwed in until the stop element (44) abuts the front end of the pipe section (10).

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