Mechanical joint

Abstract

The present invention provides a tool (80) for forming an external circumferential groove (4) on a pipe end inserted into it, said groove being configured and arranged to receive a clip ring (30, 130) designed to close onto said pipe end, wherein the tool (80) has a main hollow body (81) for mounting on a pipe end, with a pipe stop (82) for retaining the pipe end, the tool (80) having a grooving cutter (84) at an axial distance from the pipe stop (82), wherein the axial distance between the pipe stop (82) and the grooving cutter (84) can be adjusted to modify the axial distance between the pipe stop (12) and the external circumferential groove (4). Figure for the abstract: Fig. 12

Description

Title of the invention: Mechanical fitting technical field

[0001] The present invention relates to a mechanical fitting for connecting a pipe, a method for assembling such a mechanical fitting and a pipe, and a tool usable in such a method. EARLIER ART

[0002] Compression or crimp fittings are used to connect not only metal pipes, but also plastic or metal-plastic composite pipes. They are used to connect sections of pipe arranged in a suitable manner, their connecting parts being inserted into the ends of the pipes to be connected, where they are then deformed, crimped, or pressed. They are secured in certain areas, for example, using pressure sleeves on the parts, using so-called system compression tools which generally have interchangeable pressure jaws.

[0003] Pipe, tube, or conduit systems are assembled in several stages: the pipes are first inserted into a fitting, and then the fitting is crimped to ensure good mechanical strength and a leak-proof installation. Compression is essentially pressure exerted on the fitting sleeve—also called a crimping or compression sleeve—which causes the fitting to deform or conform to the shape of the pipe inserted into it. The pressure is generally applied to the fitting using a compression jaw acting as a friction tool. These compression jaws exert radial pressure on the fitting material to create interaction with the surface of the pipe(s) to be connected, thus ensuring a reliable connection and seal.

[0004] Other fittings, such as those used for example for hoses of the type of gardening equipment, use a threaded engagement to ensure the crimping of the hose and rely on the fact that a part of the fitting engages in the hose.

[0005] In both cases, the connection is based on a deformation of the pipe to be connected, most often using an insert placed inside the tube to be connected.

[0006] For different pipe configurations, crimp fittings can be designed as curved, angled or T-shaped pieces, generally with one, two or three connecting pieces.

[0007] The pipe or conduit may be of a single material and made of thermoplastic materials, including but not limited to PE, PB, PEX, PERT, PER ... or composite (multi-material pipe structure) with different layers of functional materials (PEX, PERT, PVDF, aluminium ...).

[0008] It is known to use crimp fittings made entirely of plastic, or crimp fittings with a fitting body made of metal (brass, stainless steel...), or thermoplastic (PVC, PPSU, PVDF, PPS), which can also be reinforced with fiberglass reinforcements.

[0009] However, with the introduction of c-PVC pipes, compression fittings relying on pipe material deformation for connection do not give good results. Indeed, c-PVC has different properties and is more brittle than other materials.

[0010] One proposed solution is a solvent bonding connection. However, regulations are evolving, and it will be necessary to avoid the addition of solvents.

[0011] It is therefore necessary to find another solution for compression fittings, in order to avoid the use of solvents.

[0012] One object of this disclosure is to propose a mechanical fitting allowing the connection of CPVC, PVC and PVC-U piping systems for hot and cold water installations, in particular pressurized installations.

[0013] An object of the present invention is to provide a mechanical fitting, for fitting or threaded pipe in metal or polymer. Summary of the invention

[0014] These and other objects of the present invention are accessed by means of a mechanical fitting for connecting a pipe, comprising: a main body extending axially from an open end and defining an insertion space for a pipe, a clip ring designed to close onto a pipe, and a nut movably mounted at least partially within the main body for tightening the clip ring. The clip ring is disposed inside the main body so as to be able to be contacted by the nut and has an internal circumferential projection or boss for clipping into a corresponding external circumferential groove in the pipe.

[0015] According to one aspect, the boss has an insertion surface extending from a pipe insertion end to an internal radial boss surface followed by a pull-out surface, the insertion surface forming an insertion angle with the internal radial boss surface greater than a pull-out angle formed by the pull-out surface with the internal boss surface. The geometry of the boss allows the pull-out force to be redistributed into axial and horizontal forces, while facilitating the insertion of the pipe into the clip ring.

[0016] The insertion surface and / or the removal surface may be provided with internal grooves. According to one aspect, the clip ring comprises at least one surface of A support extending axially from the pull-out surface and / or the insertion surface, forming at least one shoulder designed to bear against the outer surface of the pipe when it is inserted. This design reduces stress or load on the pipe at the groove and transmits the stress to the clip ring via the boss inserted in the groove.

[0017] The clip ring can be an open ring, with an internal diameter of the clip ring, when open, being greater than an external diameter of the groove, preferably corresponding substantially to an external diameter of the pipe, and with an internal diameter of the clip ring, when closed, equivalent to the external diameter of the groove. This ensures that the clip ring closes and transmits the force to the pipe.

[0018] According to one aspect, the clip ring has an external conical shape, with an external conical surface, decreasing in diameter from the pipe insertion end to the fitting side, and in which the clip ring is housed within a clip receiving portion of the main body, the clip receiving portion having a corresponding conical shape. This conical shape facilitates both pipe insertion and the transmission of force when closing the clip ring as the nut is moved within the fitting.

[0019] According to one aspect, the nut comprises a first nut part to be mounted inside a nut receiving part of the main body and a nut head, the first nut part having nut threads to be screwed into internal threads of the nut receiving part, and a nut head part extending from the first nut part, the head part being intended to come against the open end of the main body.

[0020] A seal may be provided inside a part of a seal housing in the main body located next to the clip receiving part.

[0021] At least one of these features is realized: the nut is made of fiber-reinforced polymer, polymer matrix or composite, the main body is made of fiber-reinforced polymer, polymer matrix or composite, the ring is made of polymer, fiber-reinforced polymer, polymer matrix or composite.

[0022] The present invention also proposes a method for assembling such a mechanical fitting and a pipe having an external circumferential groove. The method comprises inserting the pipe into the main body of the fitting and the clip ring, or inserting both the pipe and the clip ring mounted thereon into the main body of the fitting, preferably up to the internal radial rib, and moving the nut within the main body by sliding and / or screwing the nut into the main body to close the clip ring around the pipe. The method comprises inserting the boss of the clip ring into the groove in the pipe.

[0023] According to one aspect, the groove is formed by a pipe cutting step to create the groove, preferably an external circular groove on the pipe, preferably comprising the steps of simultaneously forming the circumferential external circular groove on the pipe and chamfering the insertion end of the pipe and / or correcting the insertion end. A circular groove can be formed before assembly, even if the pipe has some ovality. In other words, the groove is a tool for compensating for ovality. This is particularly advantageous when using PVC pipes, which are brittle and do not tolerate deformation.

[0024] It should be noted that the closure of the nut is a visual indication of the quality and sealing of the connection.

[0025] In addition, after tightening, the clip ring is completely closed, and there is no space for the accumulation of impurities between the seal, the rubber and the pipe, which prevents the growth of microorganisms, biological films and the accumulation of impurities.

[0026] It should be noted that the clip ring is designed to accommodate oval pipes. The clip ring's dimensions are equivalent to the groove dimensions, thus compensating for ovalization or material removal in the pipe. Furthermore, the clip ring has an angled outer surface that allows its diameter to be reduced during insertion into the fitting or when tightening the nut. The clip ring fills the groove space in the pipe and supports the pipe under radial load.

[0027] The present invention also proposes a tool for forming an external circumferential groove on a pipe end inserted therein, said groove being configured and arranged to receive a clip ring designed to close on said pipe end, in which the tool has a main hollow body to be mounted on a pipe end, with a pipe stop to stop the pipe end, the tool having a grooving knife, at an axial distance from the pipe stop, in which the axial distance between the pipe stop and the grooving knife can be adjusted to modify an axial distance between the pipe stop and the external circumferential groove.

[0028] The tool may have at least one chamfering blade extending from the pipe stop to chamfer the pipe insertion end. The chamfering blade may extend axially from the pipe stop.

[0029] According to one aspect, the tool has at least one correcting blade at the pipe stop to correct a cross-section of the pipe end and / or an end surface of the pipe end, in particular the cross-section of the pipe end being abutted against the pipe stop.

[0030] At least one chamfering blade and / or at least one correcting blade may be symmetrical to allow rotation of the tool in both directions.

[0031] According to one aspect, the tool comprises four chamfering blades and four correction blades.

[0032] According to one aspect, the tool comprises a pair of arms, preferably opposing arms, extending outwards from the main body.

[0033] According to yet another aspect, the tool has an additional pipe stop, in which the pipe stop provides a first stop surface for a first diameter, and the additional pipe stop provides a second stop surface for a second, smaller diameter.

[0034] The tool may include more than one grooving knife on the main body, in which the blades of the grooving knives can be moved axially to adjust to the depth of a groove to be made.

[0035] In one aspect, the tool further includes handles for turning the tool.

[0036] In one aspect, the tool has at least one chamfering blade extending from The pipe stop for chamfering the pipe insertion end, and a correcting blade at the pipe stop for correcting the pipe end, a pair of arms, preferably opposing arms, extending outwards from the main body. DRAWING DESCRIPTIONS

[0037] Other features and advantages of the invention will become more apparent upon reading the description of several currently preferred embodiments, provided by way of example only, with reference to the accompanying drawings, among which:

[0038] [Fig. 1] shows a mechanical fitting according to a first aspect of the present disclosure,

[0039] [Fig.2] shows the mechanical connection of [Fig.1], in exploded view,

[0040] [Fig.3] shows the mechanical connection of the [Fig.1],

[0041] [Fig.4] shows the mechanical connection of the [Fig.1] assembled with a pipe,

[0042] [Fig.5] shows a main body of the mechanical fitting according to the present,

[0043] [Fig.6] shows a clip ring usable in a mechanical fitting according to one aspect of this disclosure,

[0044] [Fig.7] shows a clip ring usable in a mechanical fitting according to one aspect of the present disclosure with a pipe,

[0045] [Fig.8] shows details of the clip ring of [Fig.7] according to one aspect of this disclosure,

[0046] [Fig.9] shows a cross-sectional view of the clip ring of [Fig.7],

[0047] [Fig. 10] shows a clip ring usable in a mechanical fitting according to another aspect of the present disclosure with a pipe,

[0048] [Fig.11] shows details of the clip ring of [Fig.10],

[0049] [Fig. 12] shows a tool according to this disclosure,

[0050] [Fig. 13] shows a tool according to another aspect of the present disclosure,

[0051] [Fig. 14] shows a tool according to another aspect of the present disclosure,

[0052] [Fig. 15] shows a method for assembling a pipe with a mechanical fitting according to one aspect of this disclosure. DETAILED DESCRIPTION

[0053] The description below refers to union fittings, but it is not limiting, and the following description applies to elbow, T or reducing fittings which can be manufactured on the basis of the same teachings.

[0054] In the figures, identical parts or elements are identified by the same reference numbers.

[0055] Figures 1 to 3 show a mechanical fitting 1 allowing the connection of a pipe 2 according to one aspect of the present disclosure, and [Fig.2] shows the mechanical fitting 1 with the pipe 2 after assembly.

[0056] Pipe 2 may, for example, be a pipe intended for / in a piping system for fluid installations inside or outside buildings. The pipe may be made of CPVC, PVC, or PVC-U for hot and cold water installations.

[0057] Fitting 1 can form one side of a connector having a similar or different type of fitting on its other end or side. The fitting can also be provided to a port of a fluidic device for connecting a hose.

[0058] The mechanical fitting 1 comprises a main body 10 for receiving the pipe. The main body 10 has an internal body surface 15 and defines a pipe insertion space extending in an axial direction, between an open end 11, where the pipe 2 is inserted, and an internal radial rib 12 extending radially within the internal body surface 15. The internal radial rib 12 is intended to stop the pipe inserted in the main body 10.

[0059] When the pipe is a multilayer pipe, a sealing gasket may be provided at the internal radial rib to protect the multilayer pipe.

[0060] A nut 40 is provided to be moved in the main body 10 into an assembly position when the pipe is inserted into the main body, in order to fix and hold the pipe in place.

[0061] As can be seen, the nut 40 is not provided in the entirety of the main body 10, but only in a nut receiving portion 18 of the main body 10 extending axially between the open end 11 and a clip receiving portion 19. The clip receiving portion 19 houses a clip ring 30 abutting against an O-ring 50 in a seal housing 58 defined by an internal radial projection 16 on the internal body surface 15. During assembly, the nut 40 pushes the clip ring 30 to press the O-ring 50 against the internal radial projection 16.

[0062] As can be seen in the figure, the internal radial projection 16 is axially spaced from the internal radial projection 12. In other words, the entire length of the pipe inserted into the fitting 1 will not be below the nut 40, and the free end of the pipe abutting the internal radial projection 12 is not provided below the nut 40. This allows for possible variations during pipe installation, as the pipe may not be fully inserted or may have a slightly inclined cross-section. Indeed, it may happen that during the installation of a piping system, the user cuts the pipe and the cut is not perfectly straight. This clearance between the internal radial projection 12 and the internal radial projection 16 ensures that the entire end of the pipe is compressed, even if the end of the pipe is not straight.

[0063] The nut 40 has a first nut portion 42 intended to be screwed into the nut receiving portion 18 of the main body 10. To this end, the nut receiving portion 18 has internal threads 17 extending from the open end 11. The internal threads 17 are designed to screw the nut 40 into the main body 10 when the pipe is inserted and positioned in the main body 10. The nut 40 therefore has corresponding nut threads 47. However, the thread is only an example, and the nut could slip in the main body.

[0064] The nut 40 also includes a nut head portion 44 which extends axially between the first nut portion 42 and a free end of the nut 48. The head portion 44 is intended to abut against the open end 11 of the main body.

[0065] The clip ring 30 is illustrated in figures 6 to 9 in a first aspect, and another example of clip ring 130 is illustrated in figures 10 and 11 in another aspect.

[0066] The clip rings 30 and 130 are designed to hold the pipe against a pull-out force due to internal pressure or external load.

[0067] The clip rings 30, 130 have an internal circumferential protuberance or boss 32, 132, respectively, to be clipped into a corresponding groove 4 of the pipe 2.

[0068] As can be seen in the figures, the boss 32 defines an insertion surface 33, 133 which extends from a pipe insertion end to an internal radial boss surface 34, 134, followed by a pull-out surface 35, 135 on the pull-out or extraction side. The geometry of the clip ring differs in the first aspect illustrated in Figures 7 to 9, and in the other aspect illustrated in Figures 10 and 11.

[0069] In the first aspect illustrated in Figures 7 to 9, the insertion surface 33 forms an insertion angle with the internal bossing surface 34 at an angle that is greater than one pull-out angle formed by the pull-out surface 35 with the internal bossing surface 34.

[0070] The dimensions of the groove and boss depend on the diameter and operating pressure of the pipe, as well as the pipe thickness and material. For example, the groove may have a depth in the range of 2 to 4%, preferably between 2.5 and 4.0% of the pipe diameter, and / or in the range of 10 to 30% of the pipe thickness.

[0071] It should be noted that the groove can have other shapes, such as circular, square or rectangular.

[0072] Finally, the clip ring 30 has a support surface 36 extending axially from the pull-out surface 34, so that the support surface 36 defines a shoulder which rests against the pipe and allows the pipe to be reinforced at the groove area.

[0073] The clip ring 130 of Figures 10 and 11 differs from the clip ring 30 mainly in that the clip ring 130 has two support surfaces 136a, 136b. A first support surface 136a extends axially from the insertion surface 133 and a second support surface extends axially from the pull-out surface 134. With this geometry, the boss 132 is located between two shoulders 136a, 136b designed to bear against the external surface of the pipe 2 and to reinforce the pipe at the groove area.

[0074] The clip ring 30, 130 is an open ring which allows the axial pull-out load to be redistributed into axial load and radial load on the body.

[0075] The internal diameter of the clip ring 30, when open, is greater than the external diameter of the pipe, in order to facilitate assembly and disassembly with the external groove 4 of the pipe.

[0076] The clip ring 30 is designed to deform and close when the nut 40 is screwed into the main body 10. When closed, under the effect of the load, the internal diameter of the clip ring 30 is reduced and becomes equivalent to the external diameter of the groove 4.

[0077] It should be noted that, in addition to holding the pipe against pull-out force, the clip ring 30 also provides support to reinforce the groove area under operating pressure. When the nut is fully closed and reaches the body, this indicates proper assembly.

[0078] Finally, the clip ring has an external conical shape, with an external conical surface 37, 137, the diameter of which decreases from the pipe insertion end to the connection side. The clip receiving portion 19 has a corresponding conical shape, with a diameter decreasing from the threads 47 to the seal housing 58, designed to cooperate with the conical surface of the ring 37, 137.

[0079] The conical shape facilitates closing the fitting onto the pipe. When the nut slides or is screwed onto the nut receiving part 18, the clip ring 30, under the effect of the load, closes around the pipe.

[0080] To distribute the load evenly along the pipe and prevent localized load concentration, the clip ring 30 may not be a fully closed ring but may instead be an open ring. The clip ring 30 may be made as a one-piece open ring, as illustrated in [Fig. 6], with an open channel, or it may be made in several parts. An open ring allows for a reduction in the diameter of the clip ring. Preferably, the clip ring is completely closed within the assembled fitting.

[0081] As stated above, the clip ring 30, 130 is designed to cooperate with a groove 4 on the pipe. A person skilled in the art understands that the groove 4 must be made on the pipe 2 in the correct position.

[0082] It should be understood that the groove can be made in the pipe, preferably on-site or just before assembly. The groove 4 is circular, even if the pipe has some ovality. In other words, the groove is a tool for compensating for ovality. This is particularly advantageous when using PVC pipes, which are brittle and cannot withstand deformation. Instead of trying to reshape the PVC pipe to make it circular again, the fitting of the present invention allows the use of a circular groove, made on-site in the pipe.

[0083] Finally, the pipe 2, as shown in the figures, is preferably chamfered to facilitate insertion onto the fitting 1.

[0084] A method for assembling a fitting and a pipe is illustrated in [Fig. 15].

[0085] First, the pipe is inserted into the main body of the fitting and into the ring at clip, preferably up to the internal radial rib 12, at step SL The pipe pushes the clip ring against the joint, and when the clip ring can no longer move axially, the pipe groove and the clip ring can engage with each other.

[0086] It is possible to clip the clip ring onto the pipe before insertion, and then insert both the pipe and the clip ring into the fitting. In both cases, the boss of the clip ring is inserted into the groove of the pipe.

[0087] Next, the nut is moved inside the main body, by sliding and / or screwing the nut into the main body to close the clip ring 30 around the pipe, in step S2, until the connection is completed (step S3).

[0088] The groove is preferably made on site, and it is possible to simultaneously form the external circular groove on the pipe and to chamfer, and possibly correct, the end of the pipe to be inserted.

[0089] It is advantageous to make the groove and the chamfer of the tube with the same tool.

[0090] Figures 12 to 14 show different examples of tools.

[0091] Figure 12 shows a tool 80 with a tool body 81 that can be mounted on the pipe end, the tool body extending axially between a pipe insertion end and a pipe stop 82 to hold the pipe end. The pipe stop 82 provides a radial / radial contact surface for the pipe end and is designed to be in contact with the cross-section of the pipe end. The pipe stop 82 is therefore perpendicular to the tool body 81.

[0092] The tool 80 is provided with chamfering blades 83 for chamfering the end of the pipe. The chamfering blades 83 extend axially from the pipe stop 82. The tool 80 also has a grooving knife 84, at an axial distance from the pipe stop 82. The axial distance between the pipe stop 82 and the grooving knife 84 corresponds to an axial distance between the pipe stop 12 and the boss of the clip ring 30, 130 of the mechanical fitting.

[0093] As can be seen in [Fig. 12], correction blades 85 are provided on the pipe stop 82 to adjust the cross-section of the pipe end. During installation, the user may cut the pipe, and once cut, the pipe end may have a slightly inclined cross-section, not be perfectly straight, or show marks resulting from the cut. This is particularly true for large diameters when the pipe is cut manually. The correction blades 85 can correct the cross-section of the pipe end against the pipe stop, as well as the end surface of the pipe end. It is also advantageous to incorporate a pipe chamfering tool and a pipe end correction tool into the same tool.

[0094] Figures 13 and 14 show two further examples of tools 180 and 280, respectively. The tools in Figures 13 and 14 can be adapted to different ranges of pipe diameters. In the examples shown, the tools 180 and 280 have a tool body 181 and 281 that can be mounted on the pipe end, the tool body 181 and 281 extending axially between a pipe insertion end and pipe stops. The tools have a first pipe stop 182a and 282a providing a first stop surface for a first diameter, and a second pipe stop 182b and 282b providing a second stop surface for a second, smaller diameter. The tools 180 and 280 can therefore be adapted to two pipe diameters, by way of example only.

[0095] Chamfering blades 183, 283 and correction blades 185, 285 are provided. In [Fig. 13], there is only one chamfering blade and one correction blade (not visible). In contrast, the tool in [Fig. 14] has four chamfering blades and four correction blades, one for each diameter. Increasing the number of blades avoids having to rotate the tool 360° to perform a Complete chamfering. For example, with four chamfering blades, a 90° rotation allows for complete chamfering. The number of chamfering and correction blades, as well as the number of grooving knives, can be adjusted according to requirements.

[0096] The chamfering blades and / or the correction blades can be symmetrical to allow rotation of the tool in both directions, according to user preferences.

[0097] Tool 180 of [Fig. 13] and tool 280 of [Fig. 14] are further equipped with several grooving cutters 184, 284 on the main body 181, 281 of the tool. It is possible to create and adapt the dimensions of the groove for different pipe diameters, using different grooving cutters, as shown in [Fig. 13], which displays two grooving cutters.

[0098] The blades of the grooving knives can be moved radially to adjust to the depth of the groove to be made.

[0099] It should be noted that, in [Fig. 13] and with tool 280 in the figure, the groove for small-diameter pipes can be made by a smaller grooving cutter mounted on the tool, since the groove dimensions are different. It is also possible to use the same groove dimensions for more than one diameter, for diameters that are close in size.

[0100] Tool 180 of [Fig. 13] and tool 280 of [Fig. 14] have handles 187, 287 to facilitate tool rotation. This is useful for large diameter pipes.

[0101] In one embodiment, the position of the grooving knife 84 can be adjusted to adapt to the mechanical fittings and pipes used.

[0102] The clip ring 30 is designed to push the O-ring 50 to ensure a seal. The internal surface features of the clip ring stack in the reshaped groove of the pipe, and the conical external surface of the clip ring helps the pipe adjust the pipe retention and redistribute the axial pull-out load into axial and radial loads on the body.

[0103] Thanks to the interface between the seal 50 and the pipe, the seal 50 deforms against the main body on one side and against the rigid pipe on the other, thus ensuring the clamping function.

[0104] The seal 50 may have an internal triangular shape to facilitate pipe insertion.

[0105] The seal is a rubber seal, preferably made of reinforced polymer.

[0106] Nut 40 is preferably made of polymer.

[0107] This technology has a significant impact on the replacement of solvent-based glue fittings for CPVC, PVC and PVC-U pipes.

[0108] The advantage of the mechanical friction fitting is that it is easy to connect and the network system quickly becomes operational.

[0109] The preceding description of preferred embodiments of the disclosure has been presented for illustrative and descriptive purposes. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired through practice of the invention. The embodiment has been chosen and described to explain the principles of the invention and its practical application to enable a person skilled in the art to use the invention in various embodiments suitable for the particular intended use. The scope of the invention is defined by the annexed claims and their equivalents.

Claims

Demands

1. A tool (80) for forming an external circumferential groove (4) on a pipe end inserted therein, said groove being configured and arranged to receive a clip ring (30, 130) designed to close on said pipe end, in which the tool (80) has a main hollow body (81) for mounting on a pipe end, with a pipe stop (82) for stopping the pipe end, the tool (80) having a grooving knife (84), at an axial distance from the pipe stop (82), in which the axial distance between the pipe stop (82) and the grooving knife (84) can be adjusted to modify an axial distance between the pipe stop (12) and external circumferential groove (4).

2. Tool according to claim 1, having at least one chamfering blade (83) extending from the pipe stop to chamfer the pipe insertion end.

3. Tool according to claim 2, wherein at least one chamfering blade (83) extends axially from the stop of the pipe (82).

4. Tool according to claim 1 or 2, having at least one correcting blade (85) at the stop of the pipe (82) to correct a cross-section of the pipe end and / or an end surface of the pipe end, in particular the cross-section of the pipe end being abutted against the pipe stop.

5. Tool according to claim 4, wherein at least one chamfering blade and / or at least one correction blade may be symmetrical to permit rotation of the tool in both directions.

6. Tool according to claim 4 or 5, comprising four chamfering blades and four correction blades.

7. Tool according to claim 1, comprising a pair of arms, preferably opposing arms, extending outwards from the main body.

8. A tool according to any one of the preceding claims, wherein the tool has an additional pipe stop (182b, 282b), wherein the pipe stop (182a, 282a) provides a first stop surface for a first diameter, and the pipe stop additional (182b, 282b) provides a second stop surface for a second lower diameter.

9. Tool according to any one of the preceding claims, comprising more than one grooving knife (184, 284) on the main body (181, 281), in which the blades of the grooving knives can be moved axially to adjust to the depth of a groove to be made.

10. Tool according to any one of the preceding claims, further comprising handles (187, 287) for turning the tool.

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