PARING AND CUTTING TOOL

Abstract

A paring and cutting tool, and a therewith associated method, for the stripping and paring of pre-insulated pipe ends, in particular of the outside diameter of the medium-conveying pipe comprising a clamping unit for the reception of the pipe end, a guide unit for the feed movement of the stripping and paring unit, wherein the guide unit extends through the clamping unit, a cutting unit for separating the outer pipe and the insulating layer, a carrier and a stripping and paring unit, wherein the stripping and paring unit has a paring element, preferably a paring blade, and a stripping element, preferably a stripping contour, for the simultaneous stripping and paring of the pipe end, in particular of the medium-conveying pipe end.

Claims

1. A paring and cutting tool (1) for the stripping and paring of pre-insulated pipe ends, in particular of the outside diameter of the medium-conveying pipe (27), comprising a clamping unit (2) for the centric reception of the pipe end, a guide unit (3) for the feed movement of the stripping and paring unit (5), wherein the guide unit (3) extends through the clamping unit (2), a cutting unit (4) for separating the outer pipe and the insulating layer, a carrier (6) and a stripping and paring unit (5), wherein the stripping and paring unit (5) has a paring element (7), preferably a paring blade, and a stripping element (8), preferably a stripping contour, for the simultaneous stripping and paring of the pipe end, in particular of the medium-conveying pipe end.

2. The paring and cutting tool (1) according to claim 1, wherein the paring element (7) and the stripping element (8) are arranged on a blade (9), preferably on the same blade.

3. The paring and cutting tool (1) according to claim 1, wherein the paring and cutting tool (1) has an unlocking unit (10), wherein the unlocking of the unlocking unit (10) enables the actuation of the cutting unit (4).

4. The paring and cutting tool (1) according to claim 1, wherein the paring and cutting tool (1) has a pipe-dimension-related coding system (11), wherein the coding system (11) serves to avoid errors with respect to an incorrectly adjusted paring and cutting tool (1).

5. The paring and cutting tool (1) according to claim 4, wherein the coding system (11) has a dimension-limiting bracket (12).

6. The paring and cutting tool (1) according to claim 1, wherein the clamping unit (2) has clamping jaws (13), preferably three.

7. The paring and cutting tool (1) according to claim 1, wherein the clamping unit (2) has clamping cones (14).

8. The paring and cutting tool (1) according to claim 7, wherein the clamping cones (14) are formed of at least two, preferably three cone segments (15), wherein their centre points are arranged regularly on a circle.

9. The paring and cutting tool (1) according to claim 1, wherein the guide unit (3) has a feed region (16) for the stripping and paring of the pipe end and a clamping region (17) for the clamping of the clamping unit (2), wherein the feed region (16) and the clamping region (17) are preferably arranged coaxially one behind the other.

10. The paring and cutting tool (1) according to claim 1, wherein the carrier (6) has a mounting (18).

11. A method for stripping and paring a pre-insulated pipe end by means of a paring and cutting tool (1) according to claim 1, wherein stripping and paring of the medium-conveying pipe (27) takes place during the same feed movement of the stripping and paring unit (5).

12. The method according to claim 11, wherein the outer protective pipe and the insulating layer are cut through after the stripping and paring of the medium-conveying pipe (27).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0061] An illustrative embodiment of the invention is described with reference to the figures, the invention not just being limited to the illustrative embodiment, wherein:

[0062] FIG. 1 shows a three-dimensional view of a tool according to the invention,

[0063] FIG. 2 shows a longitudinal section of a tool according to the invention,

[0064] FIG. 3 shows an exploded view of the guide unit, and

[0065] FIG. 4 shows a three-dimensional view of a tool according to the invention with clamped pipe end.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0066] FIG. 1 shows a three-dimensional view of a paring and cutting tool 1 according to the invention. The paring and cutting tool 1 serves for the stripping and paring of pre-insulated pipe ends, in particular of the medium-conveying pipe 27. This is used to be able to connect the stripped medium-conveying pipe 27 to a further pipe or fitting in order to insert the stripped region or the bare medium-conveying pipe 27 into, for instance, a fitting, and then to sealingly connect these one to the other, for instance by welding. Preferably, this concerns plastics pipes, that is to say that both the medium-conveying pipe 27 is preferably made of plastic and also the outer pipe for protecting the insulating layer is made of plastic, wherein it has also been shown that a further advantageous embodiment of the outer pipe is made of metal. The insulating layer is preferably a foamed plastic.

[0067] The paring and cutting tool 1 comprises a clamping unit 2, which serves to receive the medium-conveying pipe 27. By a clamping of the pipe end on the medium-conveying pipe 27, it is ensured that the stripping, paring, and cutting operation takes place concentrically to the medium-conveying pipe 27, which is essential in order that the medium-conveying pipe 27 is not damaged. Similarly, the tool 1 comprises a guide unit 3, inter alia for the feed movement of the stripping and paring unit 5, wherein the feed movement is initiated by the carrier 6, by rotation of the carrier 6 about the spindle or spindle sleeve of the feed region 16 of the guide unit 3. The carrier 6 is configured as a type of arm with mounting 18, as can clearly be seen from FIG. 2. The carrier 6 has a spindle nut 19, which, by the rotation of the carrier 6, is movable on the spindle or in the feed region 16 of the guide unit 3. On the spindle nut 19 is arranged the stripping and paring unit 5, which is adaptable, and thus also easily exchangeable, as a result of merely being mounted onto the spindle nut 19. The stripping and paring unit 5 is arranged in a rotationally secure manner on the spindle nut 19. The guide unit 3 extends through the clamping unit 2, as well as through the mounting 18 or through the spindle nut 19 in the carrier 6. The guide unit 3 has a feed region 16, as already mentioned, which is preferably configured as a spindle or spindle nut. Furthermore, the guide unit 3 has a clamping region 17, which serves to clamp the pipe end in place over the inside diameter of the medium-conveying pipe 27. In FIGS. 1 and 2, diameter-specific jaws 25 are already adapted to the clamping jaws 13, wherein this adaptation can be realized by pins, as well as magnetically or in some other way.

[0068] FIG. 3 shows the guide unit 2 in an exploded representation, in which it can clearly be seen that preferably three clamping jaws 13 are arranged in the clamping region 17 of the guide unit 3. The guide unit 3 has a clamping shaft 30, which extends through the feed region 17 or the spindle sleeve. On the clamping shaft 30 are arranged two clamping cones 14, which are oriented oppositely to each other.

[0069] Between the clamping cones 14 are found the clamping jaws 13, which are preferably held around the clamping shaft 30 by retaining elements 31. As the retaining elements 31 O-rings have proved successful, though other retaining elements 31 too are conceivable, wherein it is important that the clamping jaws 13 or the clamping diameter formed by the clamping jaws 13 is/are adjustable and the clamping jaws 13 can travel outwards and inwards. The adjustment of the outside diameter by means of the clamping jaws 13 is achieved by virtue of the fact that, through rotation of the clamping shaft 30, the clamping cones 14, due to that thread on the clamping shaft 30 on which a clamping cone 14 is arranged, move towards each other or away from each other and this, in turn, pushes the clamping jaws 13 on the clamping cones 14 up or down or inwards or outwards. Of course, the adapted diameter-specific jaws 29 move correspondingly along therewith and allow a clamping of the medium-conveying pipe 27. In order to ensure that the clamping jaws 13 bear tightly against the clamping cones 14, the clamping cones 14 have cone segments 15, preferably a clamping cone 14 has three cone segments 15, which allow the clamping jaws 13 a peripheral support.

[0070] If a pipe end is now clamped in place on the clamping unit 2, as can be seen in FIG. 4, a feed movement along the feed region 16 of the guide unit 3 is effected by the rotation of the carrier 6 with the aid of a handle 20. The stripping and paring unit 5 likewise move rotatingly in the direction of the pipe or in the pipe. The stripping and paring unit 5 has a paring element 7, preferably a paring blade, and a stripping element 8, preferably a stripping contour 8. The stripping and paring is hence realized during the same feed movement or simultaneously. The stripping and paring unit 5 preferably comprises a blade holder 21, to which a blade 9 is fastened, wherein the paring element 7 or the paring blade, and the stripping element 8 or the stripping contour, are arranged on the blade 9. The stripping contour 8 extends preferably along the periphery of the blade 9 or over a certain region of the periphery of the blade 9 and is preferably configured as a bevel. The paring blade 7 is formed by a notch in the blade 9 or by an edge of the notch in the blade 9. As already described, the stripping and paring unit 5 is diameter-specific, that is to say that the stripping and paring unit 5 can be used in accordance with the pipe end to be stripped. This means that, on the one hand, the blade 9 is positioned precisely at the position of the outer casing surface of the medium-conveying pipe and, on the other hand, the pipe length to be stripped is precisely defined by the length of the blade 9 and the stop face 32 on the blade holder 21, whereby a manual measurement becomes superfluous.

[0071] At the upper end of the carrier 6 is arranged the cutting unit 4 of the paring and cutting tool 1, which latter serves to cut off the outer pipe and the insulating layer. In order to be able to actuate the cutting unit 4 after the stripping and paring operation, the unlocking unit 10 in the bearing region of the carrier 6 must be unlocked in order to release the locking mechanism. The unlocking unit 10, which acts, through a bore, on the spindle nut 19, effects the fixing between carrier 6 and spindle nut 19 with intermediate bearings 35. If the unlocking unit 10 is now released, the bearing 35 can rotate freely or the carrier 6 can rotate about the upright spindle nut 19. This enables a circumferential cut around the pipe end or the outer pipe. In order to reset the cutting depth of the cutting unit 4 in order that also the complete insulating layer is cut through, the rotary cutter 23 is lowered via a spindle 24, wherein the adjustment of the spindle 24 is made at the knob 26. Since it is advantageous if the cutting unit 4, during the stripping and paring operation, is somewhat further distanced from the pipe end, and the adjustment of the cutting unit 4 to a position closer to the pipe is intended not to be made slowly via the spindle 24, but instead to proceed rapidly, the spindle 24 is disposed in a slide 25, which is able to be pushed downwards, by the pressure on the knob 26, as far as the starting position for the rotary cutter 23 for cutting. The further adjustment of the rotary cutter 23 is then realized via the spindle 24, wherein the adjustment is made during several revolutions of the cutting unit 4 around the pipe end or during the cutting operation until the insulating layer is cut through. The cutting unit 4 similarly comprises a tension spring (not visible), which brings the slide 25, by release of the locking mechanism 28, back into the starting position or into the position distanced from the pipe or from the clamping unit 2.

[0072] As already mentioned, the paring and cutting tool 1 is usable for the different pipe diameters and easily convertible. Besides the dimension-specific stripping and paring unit 5, which is to be appropriately fitted on the spindle nut 19, the tool 1 also has a pipe-dimension-related coding system 11, which prevents damage to the medium-conveying pipe 27. The coding system has a dimension-limiting bracket 12, which is fixed to the cutting unit 4 and predefines the height adjustment of the cutting unit 4 due to the fastened stripping and paring unit, or does not allow too low a setting.

[0073] If, for instance, a stripping and paring unit 5 is installed for a 90 mm medium-conveying pipe, the dimension-limiting bracket 12 prevents lowering of the cutting unit 4 on the carrier 6 onto the underlying positioning bores 22 for smaller sized medium-conveying pipes, since the dimension-limiting bracket 12 is already prematurely butting against the stripping and paring unit 5.