MXPA00006069A - Wirelaying tool - Google Patents

Abstract

A wirelaying apparatus and method using a tool (30) having a cutter (31) operatively opening a cut in the interior bore surface (11) of a cylindrical pipe fitting (10), laying wire (12) into the cut and closing the cut using a flange closer (33). The wire (12) is delivered into the cut via an aperture (32) through the cutting means (31). Delivery of the wire (12) intothe cut is thereby improved, overcoming the problem of wire running free within the fitting. In a second embodiment (see Figure 12) the cutter (31) is rotatably mounted allowing a double helical coil to be formed without removing the cutter from the bore surface.

Description

TOOL FOR LAYING CABLES DESCRIPTION OF THE INVENTION The present invention relates in general to an apparatus and method for cable laying, and in particular but not exclusively to a tool for laying cable on the surface of a body. In a preferred embodiment, the invention relates to a method and apparatus for laying cables on a bore surface inside a tube assembly. Pipe assemblies are typically used to couple the ends of the pipes including, for example, plastic pipes for the gas supply. The pipes must be connected by a sealed splice so that, in use, no gas is allowed to escape through the splice. A known method of fabricating a sealed splice is to couple the ends of the plastic tubes to be joined in a pipe assembly in the form of a cylindrical handle. An electrical conductor is included in a surface of the internal bore of the handle, usually in the form of a helical winding of copper wire. When one end of each tube is positioned on the handle, an electric current passes through the cable, which causes the cable to get hot, whereby the plastic material is melted on the surface of the bore of the handle or on the outer surfaces of the cable. the tubes, or both. The end of the tube is therefore melted or welded to the handle in a gas-tight sealed fitting. EP-A-0 569,625 describes an apparatus for laying cables of the prior art inside the bore surface of a tube fitting, comprising a cutting tool for cutting a groove in the inner surface, a guide of cable to guide the cable in the slot, and a means of enclosure to return the cut material back into the slot to enclose the cable. A problem arises with the apparatus and method of the prior art, wherein a separate tool is required for each diameter of the tube assembly, because the shape of the prior art tool closely follows the inner diameter of the tube assembly. When the tool for laying the cable is used in an inappropriate size of the handle, the cable is not placed correctly in the groove and instead, tends to run free within the assembly, resulting in the useless assembly.

It is desired to improve the flexibility and reliability of the method and apparatus of the prior art. Also, in at least one preferred first embodiment, it is desired to provide a method and apparatus for laying a cable in a body having a non-constant inner diameter. That is, an inner diameter that varied along all or part of the length of the body, such as a reducer tube assembly. Furthermore, it is desired to provide a method and apparatus for laying cable in a body having an unusable area, such as a side opening of a T-tube assembly. It is desired to place a single cable along a mounting of T-shaped tube in a helical winding in and near the first and second ends thereof but avoiding lateral opening. Additionally, even in another preferred embodiment, it is desired to provide an improved method and apparatus for laying in a helical winding of a single piece of cable such that the cable is returned to approach a starting point. According to the first aspect of the present invention there is provided a cable laying apparatus for laying the cable on an inner bore surface of a hollow cylinder, comprising: a cutting means for making a cut on the surface of the inner bore; a cable guide means for guiding the cable in the cut; and a joining means for closing the cut by which the cable is cut in the cut; characterized in that: the cable guide means is placed such that the cable enters the cut through the cutting means. Advantageously, the cable enters the cut directly through the cutting means and therefore can not run freely. Preferably, "the cable is ideally guided through an opening in the cutting means to an outer surface of the cutting means which, in use, is frontal to the cut .. Preferably, the cutting means is arranged to produce a cut that is substantially normal to the surface of the inner bore, and in the form of a groove, with the cutting means lifting a flange preferably to one side of the cut Ideally, the guiding means leads the wire in the cut to an area below the bore. the flange, and preferably at a corner position below the flange Preferably, the cable laying apparatus comprises a cable laying tool integrally forming the cutting means, the cable guide means and the attachment means. Preferably, the tool is positioned to be carried on an elongated bar, with a cable that is preferably fed along the bar, appropriately by a cable release means such as a power array. read, to the middle of cable guide. The preferred embodiment is particularly desired for the laying of cable on the inner bore surface of a tube of plastic material or tube assembly. The cable laying apparatus is preferably arranged to receive the tube or tube assembly for rotation about a longitudinal axis thereof with the cable laying tool to be retained on the bar against the surface of the inner bore such that the adjustment of The tube is operatively rotated with respect to the cable laying tool. Preferably, the cable laying tool is positioned such that the joining means is in a plane normal to the longitudinal rotational axis of the tube assembly. Accordingly, the maximum pressure can be applied by the joining means to close the flexible blade cut by the cutting means even when the tool is used with a tube assembly having an inner diameter substantially greater than the outer circumference of the tool. However, the cable laying tool is preferably arranged to have an outer circumference corresponding to the desired inner diameter of a tube assembly. Preferably, the cable laying tool is mounted in a receiving pocket in the bar such that the tool is aligned with an end face and an outer circumferential face of the bar. By mounting the cable laying tool in this position in the bar, several operational advantages are achieved. In particular, the cutting means is placed to remain at or near the end of the bar. Placing the cutting tool in this position allows the cutting tool to remain in contact with the interior bore surface even if the bore surface interior diameter changes along the length of the tube assembly, as in a reducer used for attach the tubes of different diameters. An additional advantage of the cable laying apparatus is that the passage of the helical path followed by the cable laying tool can be changed during the laying of cables. In particular, the cable laying apparatus can move the cable laying tool to greatly increase the pitch of the helical path. This feature is particularly advantageous, for example, in laying a continuous portion of cable within a T-shaped tube assembly such that the cable can remain to prevent a lateral opening of the T-shaped assembly. Second aspect of the present invention, there is provided a cable laying apparatus, for laying cable in a body, the apparatus comprising a cutting means that is rotatable about a substantially normal axis to a surface of the inner bore of the body. The cutting means is preferably provided with a cutting face preferably desired to make a cut, in use, by moving the cutting means through the surface of the inner core., in the direction of the cutting face. Advantageously, the cutting means is rotatable, such that the cutting face is turned on the shaft. Preferably, a cable guide means directs a cable through the cutting means along the axis such that the cutting means rotates on the cable. Advantageously, the cutting tool is driven in a first direction, to lay the cable in a first helical path, then it is rotated substantially transverse to 90 ° and it is conducted to lay the cable along a linear path, and then it is rotated transversely at an additional 90 °, to lay the cable in a second helical path. Preferably, the second helical path remains between the first helical path such that a double helical path is formed. For a better understanding of the invention, and to show how the embodiments thereof can be carried out, reference will now be made, by way of example, to the accompanying diagrammatic drawings, wherein: Figure 1 is a view lateral perspective of a tube assembly; Figure 2 is a cross-sectional view of the tube fitting of Figure 1; Figure 3 is a plan view of an apparatus for cable laying; Figure 4 is an end view of a tool for laying cables in use in a tube assembly; Figure 5 is a side view of the tool for laying cables; Figure 6 is a front view of the cable laying tool; Figure 7 is a plan view of the cable laying tool; Figure 8 is a sectional side view of a preferred reducer tube assembly; Figure 9 is a rear elevational view of a second preferred cable routing apparatus; Figure 10 is a plan view of the apparatus of Figure 9; Figure 11 is an end view of the apparatus of Figure 9; Figure 12 is a sectional cross-sectional view of a preferred main portion of the cable laying apparatus of Figure 9; and Figure 13 is a sectional cross-sectional view of a preferred handle tube assembly having a double helical wire winding that remains thereon. Referring first to Figures 1 and 2, the tube assembly 10 is shown in the form of a handle used to connect the ends of tubes as the gas tubes. The assembly 10 is hollow and generally cylindrical and has a surface of the bore 11 internal. Embedded in the surface of the bore 11 is a helical winding of the copper wire 12, a first end 12a projecting from a first hole 13a on the outside of the assembly 10 and the second end 12b projecting from a second hole 13b on the outside of the assembly 10. Also referring to Figure 2, this sample, in cross section, a portion of the surface of the bore 11 of the assembly 10 with the helical winding of the copper cable 12 embedded therein. The turns of the cable 12 are joined by the plastic material on the surface of the bore 11 causing the surface of the bore 11 to be curled. The wire is firmly retained on the surface of the bore 11 and is not prone to being insulated, as is the case with the previous assemblies of this type. In use, when the assembly is required to connect two plastic tubes (not shown), each end of the tubes is inserted into the respective ends of the assembly 10. The bore diameter of the assembly 10, which is to connect , is chosen to be a friction fit with the tubes. Once the tubes are in position, an electric current is flowed through the copper wire 12 by appropriately connecting the ends 12a, 12b of the winding to a voltage source. The passage of the electric current through the cable 12 causes the cable to heat up, where the heat causes the plastic material surrounding the cable 12 to melt. In addition, the heat of the cable at least partially melts the outer surfaces of the tubes . After a predetermined time, the flow of the current in the cable 12 is stopped and the tubes and the assembly are allowed to cool. The result is to weld together each tube to assembly 10 to produce a relatively strong splice. Preferably, the assembly is a gas-tight waterproof seal and so that the assembly 10 can be used to sealingly connect the gas tubes. Turning now to Figures 3 to 7, these show an apparatus for laying the cable 12 in a hollow cylindrical body such as a tube fitting 10 shown in Figures 1 and 2. Referring to Figure 3, the apparatus for laying the cables of the first embodiment comprises a steel head portion 22, and a steel support arm 21 which is connected to and supports the head portion 22. Mounted on the head portion 22 is a tool for laying cables 30 and a cable supply means including a guide pulley 23 which supplies the copper cable 12 for the cable laying tool 30 during the process for laying cables. The head portion 22 has an arcuate friction surface which has hardened and burnished to flame. The head portion can also carry a reaming cutter (not shown), in a position opposite to the cable laying tool 30. In use, a tube assembly 10 is adjusted, for example, on the axis of a CNC machine numerically controlled by computer (not shown) and the support arm 21 of the cable laying device 20 is mounted on the machine holding tool. Optionally, a drilling operation is performed first in the assembly 10, using a cutter for individual drilling (reaming), or conveniently using a drilling cutter carried in the head portion 22 of the cable laying tool 20. The CNC machine it is suitably programmed to rotate the assembly 10 at a first speed of up to about 2000 revolutions per minute, and advance the apparatus for laying cables in the bore of the assembly 10 without initially contacting the assembly 10. Once the apparatus for the cable laying is totally turned inside the assembly 10, at the end where the assembly is secured to the shaft, the cable laying apparatus is maneuvered so that the drilling cutter is made to cut on the surface of the bore 11 of the assembly 10, at a predetermined depth, and the cable laying apparatus is slowly withdrawn from within the bore of the assembly at a speed predetermined, maintaining the cutting of the bore surface at the predetermined depth, to perform a drilling operation. This ensures that the surface of the bore is consistent and uniformly cylindrical for the operation for laying cables. Once the head portion 22 is completely removed and any waste material or chips have been removed, the CNC machine causes the head portion 22 to re-enter the bore of the adjustment 10. The operation for laying the cables will now be described. general terms with reference to Figure 3, and with reference to Figures 4 to 7 which show in more detail the tool for laying cables 30 of the cable laying apparatus 20. Those experienced in the field of CNC machines will be familiar with the conventional descriptions of the movements of X, Y and Z as will be referred to below, with Y designating the movement due to the rotation of a workpiece in relation to a tool, X that designates the movement in a normal horizontal plane to the axis of rotation of the workpiece, and Z which designates the movement parallel to the axis of rotation. For the cable laying process, the CNC machine causes the assembly 10 to rotate at approximately 50 revolutions per minute and the cable routing tool 30 be brought into contact with the bore surface 11 of the assembly 10 to cut a groove in the same. The groove is substantially normal to the surface of bore 11 of assembly 10. Moving tool 30 at a constant speed in the direction of Z movement as represented by arrow Z in Figure 3, combined with the constant rotary motion of Y of the tube assembly represented by the arrow Y in Figure 4, a helical groove of constant pitch is formed. Referring to Figure 4, the preferred position of the tool 30 is shown in relation to a tube assembly 10, with the cutter 31 engaging the inner surface. A flexible blade adjuster 33 is arranged to remain in a plane plane normal to the axis of rotation of assembly A, ie, in the center line of the assembly, and the cutter remains just above this center line. Therefore, if the assembly 10 is exchanged for one of a larger diameter, the flexible blade adjuster still remains close adjacent the surface of the bore 11. The same tool can be used for laying cables in tubes of different diameters. OnfapiB e-1- cutter 31 of the tool 30 cuts a groove in the surface of the rotating bore 11 of the assembly 10, a flange of plastic material moves to one side of the cutter 31. The wire 12 is fed through an opening 32 directly in the cutter 31 in the newly cut groove. The displaced tab of plastic material is guided in a direction substantially parallel to the cutting direction, to find a surface of the flexible sheet adjuster 33. which extends through the tool 30 at an angle of approximately 45 °. The flexible blade adjuster 33 drives the flange toward the opposite side of the newly cut slot whereby at least partly covers the laid wire. The flexible blade adjuster 33 is then pressed against the displaced material causing it to become hot due to friction. The result is that the displaced material is made to deform and encircle the cable in the cut groove. The drilling of the surface of the bore 11, immediately prior to the cable laying operation, it provides the benefit that the bore surface is still hot from the friction caused by the bore cutter when it starts the process for laying cables. This aids the additional frictional heating of the surface of the bore 11 by the flexible blade adjuster 33 and by a friction surface of the head portion 22 when it causes the displaced plastic material to flow over the cable, whereby the cable is embedded in the recently cut slot. The continuous process of cable laying therefore involves the temporary opening of a slot, the laying of the cable in the slot, and the immediate enclosure of the cable in the slot. Referring to Figures 5, 6 and 7, the cable laying tool will now be described in greater detail. The cable routing tool 30 is preferably formed by machining a single block of material such as steel to form a cutter 31, a guide opening of the cable 32, and a flexible blade adjuster 33. The guide opening of the cable 32 is extends from a broad oval-shaped opening 32a in the upper and rear part of the tool 30 at an angle in the range of about 20 ° to 30 ° to emerge in an opening 32b on a face of the cutter 31 at the front of the tool. The cutter 31 is provided with a first angled face 31a leading to a cutting edge, and a second angled face 31b for directing the opening extending the rope 32b towards a desired area of the cut, preferably a stronger corner portion. The cutter 31 is narrower in the region of the first face 31a than in the second face 31b to progressively force the open cut. It will be appreciated that modifications can be made to the apparatus and method without departing from the scope of the invention. For example a CNC machine does not need to be used to operate the cable laying apparatus, although it has been found convenient to do so. In addition, the cable length could start at the end of the assembly 10 near the axis of the machine, with the head portion 14 gradually progressing out of the bore of the assembly 10. The operation of the cable laying apparatus for laying the cables will now be described. cables in a tube assembly that has a variable inside diameter. Figure 8 is a sectional side view of a tube assembly in the form of a reducer having a first end 14 for receiving a tube of a first diameter, a second end 16 for receiving a tube of a smaller second diameter, and a section inclined 15 between them. It is desired to lay a continuous loop of cable from an inlet 13a to an inlet 13b. Previously this has not been possible due to the difficulty of correctly laying the cable in the inclined section 15. In operation, the cable routing tool 31 is carried on the bar 21 at the first end 14 of the assembly and is aligned with the first hole 13a. The bar 21 is then subjected to an axis X that moves to direct the cutter 31 to a predetermined depth on the surface of the inner bore 11. Then, the tube assembly is rotated in the direction of the arrow Y of Figure 8, and the tool is directed along the Z direction to lay the cable in a helical winding in a helical groove 124 of a predetermined first passage. The first winding 124 is placed at a predetermined distance to achieve a reliable hermetic gas connection in use. The winding does not continue along the entire length of the first section 14 of the tube assembly 10 because of the end portion of a tube that is inserted into the first section 14, it is particularly vulnerable with respect to heating, causing a deformation unwanted Therefore, a cold zone is provided to substantially increase the speed of movement in the Z direction to provide a second helical winding 125, which has a relatively greater step. Once the tool advances to a desired region of the second smaller section 16 of the tube assembly 10, the conduction in the Z direction is delayed to provide a third helical winding 126 in the smaller diameter section 16. OxCome ^ a The tool enters the inclined portion 15, requires a movement in the X direction, ie outside the plane of the paper of Figure 8, to follow the reduced diameter of the inclined section. Referring again to Figure 3, it will be seen that the tool 30 is mounted in a recess in the forward end of the head portion 22 of the bar 21, such that the tool 30 is the first part of the cable laying apparatus, to find the inclined surface 15, and therefore the cutter 31 is kept in contact with the surface of the inner bore 11 along the inclined section 15. Since the wire 12 enters the cut directly through the opening 32b in the cutter 31, the cable is reliably placed in the cut and does not run freely inside the mount. A similar method of operation is used to place a single piece of cable in a tube assembly that has an unusable area, such as a T-tube assembly having a side opening positioned approximately halfway along the length of the tube. length of tube assembly. Similar to the arrangement shown in Figure 8, the helical windings 124 and 126 are provided at either end of a T-shaped assembly, and a larger pitch of the helical winding 125 is used to prevent lateral opening, by running the groove in the surface of the inner core that surrounds it and is opposite the opening. A second preferred embodiment of the cable laying apparatus will now be described with reference to Figures 9 to 13, where similar reference numerals are used for the parts corresponding to the apparatus described with reference to Figures 1 to 8. Figure 9 shows an opposite elevated view of the cable laying apparatus 20 having a support arm 21 carrying a head portion 22. In use, the cable to be laid is transported along the support arm 21 as a pulley arrangement (not shown) in an opening 23. Figure 10 is an entire view of the apparatus of Figure 9, showing the opening 23 passing through the head portion 22 from an inlet 23a to an outlet 23b. Figure 11 is an extraneous view of the apparatus of Figures 9 and 10, and Figure 12 is a cross-sectional view of the head portion 22. As more clearly shown in the Figures 11 and 12, the head portion 22 is provided with a curved pressure or friction surface facing forward 24 desired to remain in use against the surface of the inner bore 11 of a tube assembly, as in the first embodiment. A hollow shaft 25 is provided in the opening 23 having a slotted end 25a which acts as a pinion arrangement engaged with a rack 26 running on the support arm 21. Longitudinal movement of the rack 26 rotates the hollow shaft 25 within of the opening 23. A cutter 31 is provided at a front end of the shaft 25 projecting from the outlet 23b of the opening 23. The cutter 31 is preferably received non-rotatably within the inner end 25b of the shaft 25, rotating with the axis 25, as a mounting box in cross section in a corresponding square recess. The rack arrangement 26 and pinion 25a are conveniently sized to fit within the confines of the support arm 21 and the head 22 and thus fit within a tube assembly, but any other suitable rotation arrangement may be employed. In use, a cable 12 to be laid is guided through the center of the hollow shaft 25, conveniently using a ceramic disc 27 at the entrance thereof to reduce friction. The cable 12 passes through the guide opening of the central longitudinal cable 32 of the cutter 31, to arise directly from the cutter 31 in the freshly cut groove. Conveniently, the cutter 31 can be rotated on the cable 12, such that the cable can remain in a direction-changing slot while the cutter 31 engages the surface of the bore 11 of the assembly 10. The outlet 23b of the opening 23 is provided with a plate 23 having a plurality of flexible adjusters 33 mounted thereon or formed therein. The or each flexible adjuster 33 is positioned to remain subsequently in the cutting direction of the cutter 31.

Referring now to Figure 13, a preferred method of operating the apparatus shown in Figures 9-12 will be described. Figure 13 shows a section of a tube assembly 10 where it is desired to lay a single continuous piece of cable 12 in a double helical path from an inlet 13a to an outlet 13b. This arrangement finds a particular application, for example, when it is desired to provide more than one arrangement in a tube assembly so that a connection can be made individually, conveniently at different points in time. The double helical winding arrangement can be used with any form of tube assembly, including a sleeve, reducer, T-shaped, elbow or cap end tube assembly. With particular reference to Figure 12 and Figure 13, the cutter 31 is put in a first direction and is directed by the appropriate movement X and Z of the support arm 21 through the surface of the inner bore 11 of the tube assembly 10 rotating past the cutter 31, such that the cable 12 remains in a first helical winding 121. At the end of the first helical winding 121, rotation of the pipe assembly 10 and movement of the head 22 and the arm 21 are stopped. That is, in a position 121a of Figure 13. The cutter 31 is then rotated by means of the rack 26 and the pinion 25a through approximately 90 ° in a second desired cutting direction. The cable 12 is placed in the second direction in a linear path without the assembly 10 to be rotated, to form a joint portion 122. The joint portion is ideally of a length corresponding to half the pitch of the first helical winding 121. The tool 31 is then rotated back to a third cutting direction, preferably through approximately 90 ° such that the tool has rotated transversely by approximately 180 ° from the first cutting direction. Turning the assembly 10 in the reverse direction and making a movement in the inverse direction Z of the head portion 22, the cutter 31 delineates a second helical path 123 from the position 123a to the exit hole 13b. The present invention is extended to cover the embodiments of the cable laying apparatus and the methods of operation of the cable laying apparatus, as described above, and the mounting tubes produced by the apparatus and methods. The invention particularly encompasses the cable laying tool 30 having a cable guide opening therethrough to provide the cable directly in the cut. The reader's attention is directed to all the papers and documents with which they were presented concurrently with or before this specification in relation to this application and that is open to public inspection with this specification, and the contents of all the papers and documents they are incorporated herein by reference. All features described in this specification (including any of the appended claims, extract and drawings), and / or all steps of any method or process described, may be combined in any combination, except combinations where at least some of the features and / or stages are mutually exclusive. Each feature described in this specification (including any of the appended claims, extract and drawings), may be replaced by alternative features serving them, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature described is only an example of a generic series of equivalent or similar features. The invention is not restricted to the details of the above embodiment (s). The invention extends to any novelty, or any new combination, of the features described in this specification (including any appended claims, extracts and drawings), or to any novelties, or any new combination, of the steps of any method or process described.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects or products to which it refers.

Claims (20)

1. Having described the invention as above, the content of the following claims is claimed as property: 1. A cable laying apparatus for laying the cable on a surface of the interior bore of a hollow cylinder, comprising: a cutting tool, which has a cutter to make a cut on the surface of the inner core; a cable guide means for guiding the cable in the cut; and a joining means for closing the cut, whereby the cable is closed in the cut; characterized in that: the cable guide means comprises an apparatus extending through the cutting tool to an outer surface of the cutter being in the cut in use such that the cable enters the cut directly through the cutter.
2. 2. A cable laying apparatus as claimed in claim 1, characterized in that the wire cutter is arranged to produce the cut by raising a flange of material from the surface of the inner bore, and where the cable guiding means guides the cable in Cutting in an area under the tab.
3. 3. A cable laying apparatus as claimed in claim 2, characterized in that the cable guiding means is arranged to direct the cable in a corner position of the cut under the flange.
4. 4. A cable laying apparatus as claimed in any of claims 1 to 3, characterized in that the cutter, the cable guide means and the joining means are formed as a combination tool.
5. 5. A cable laying apparatus as claimed in claim 4, characterized in that the combination tool was arranged to be carried on an elongated bar having a radius of catheter suture to the radius of qj a. give him
6. 6. A cable laying apparatus as claimed in claim 5, characterized in that the combination tool is mounted in a receiving recess of the elongated bar such that the cable laying tool is aligned with an end face of the cable. elongated bar and aligned with or protruding from an outer circumferential face of the elongated bar.
7. 7. A cable laying apparatus as claimed in any of claims 1 to 6, characterized in that the joining means is operably arranged to remain in a plane normal to the longitudinal rotational axis of the hollow cylinder having the surface of the inner bore.
8. 8. A cable laying apparatus as claimed in any of claims 4 to 7, characterized in that the combination cutting tool comprises the cutter, the cable guide means and the integrating means formed integrally.
9. 9. A cable laying apparatus as claimed in any of claims 1 to 7, characterized in that the cutter is rotatable.
10. 10. A cable laying apparatus as claimed in claim 9, characterized in that the cutter is rotatable about the cable connection opening.
11. 11. A cable laying apparatus as claimed in claim 9 or 10, characterized in that the cutter is operatively rotatable about a substantially normal axis on the surface of the inner bore.
12. 12. A cable laying apparatus as claimed in claim 11, characterized in that the cutter comprises a cutting face for operatively making a cut through the surface of the inner bore in the direction of the cutting face, and where the Cutting means is rotatable such that the cutting face is rotated about the axis.
13. 13. A cable laying apparatus as claimed in any of claims 1 to 12, characterized in that L ccr6a is located adjacent to an arcuate friction surface arranged for frictional heating of the surface of the inner core.
14. 14. A cable laying apparatus as claimed in any of claims 1 to 13, characterized in that it comprises a reaming cutter.
15. 15. A method for laying the cables on a surface of the inner core of a hollow cylinder, comprising the steps of: opening a cut on the surface of the inner core using a cutting tool having a cutter; guide a cable in the cut; and close the cut to fence the wire in the cut; characterized in that: in the step for guiding, the cable is guided directly in the cut by means of an opening extending through the cutter to an outer surface thereof remaining in the cut.
16. 16. The method as claimed in claim 15, characterized in that it additionally comprises the step of scanning the .surface of the anterior inner core to form the cut.
17. 17. A method as claimed in claim 15 or 16, characterized in that the cable is continuously laid on the inner bore surface of a reducer tube assembly having a first section for receiving a tube of a first diameter, a second section to receive a tube of a greater or lesser second diameter, and a section inclined therebetween.
18. 18. A method as claimed in claim 17, characterized in that it comprises the steps of laying the cable in a first helical winding in the first section, laying a second helical winding having a relatively greater pitch in the inclined section, and laying a third helical winding in the second section.
19. 19. a method as claimed in claim 15 or 16, for laying the cable at two opposite ends of a tube N, characterized in that it comprises the step of laying the cable in a helical winding of sufficiently large pitch to avoid a lateral opening in the surface of the inner core.
20. 20. A method as claimed in claim 15 or 16, for laying a double helical winding on the surface of the inner bore, characterized in that it comprises the steps of placing a first helical winding of a predetermined pitch, by rotating the cutting means, placing a joint portion corresponding to the order of the half of the predetermined pitch, rotating the cutter, and tending a second helical winding between the first helical winding. / • TOOL FOR LAYING CABLES SUMMARY OF THE INVENTION A cable laying apparatus and method using a tool (30) having a cutter (31) operatively opening a cut on the surface of the inner bore (11) or a cylindrical tube assembly (10), laying the wire (12) in the cut and closing the cut using a flexible blade adjuster (33). The wire (12) is supplied in the cut by means of an opening (32) through the cutting means (31). The release of the wire (21) in the cut is therefore improved, overcoming the problem of the free running wire within the assembly. In a second embodiment (see Figure 12) the cutter (31) is rotatably mounted, allowing the double helical winding to be formed without removing the cutter from the surface of the bore.