Abstract:
The present invention relates to a tubular support coil for radial support of resiliently expanded tubing material, made from at least one extruded profile body wound into a plurality of windings, the end faces of the extruded profile body being connected to each other at least in portions in the longitudinal direction of the support coil and interlocked by a ratchet arrangement in the longitudinal direction and by a tongue and groove arrangement in a radial direction. To create an improved support coil, which is inexpensive to produce, reliably withstands exterior pressing forces and can easily be taken apart manually with low releasing forces and removed from the tubing material, it is proposed that the present invention has a rotation prevention means, through which adjacent windings are held secure against rotation.

Description:
CROSS-REFERENCE TO RELATED APPLICATION DATA 
       [0001]    This application is a National Stage Application filed under 35 U.S.C. § 371 of PCT/EP2007/004636, filed on May 24, 2007, which claims priority of German Application Nos.: DE 10 2006 024 840.6, filed May 24, 2006 and DE 10 2007 18 915.1, filed on Apr. 19, 2007. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The invention relates to a support coil for the radial support of resiliently expanded tubing material and more particularly to a support coil for radial support of resiliently expanded tubing material and characterized by a rotation prevention means, through which adjacent turns are held secure against rotation. 
       BACKGROUND 
       [0003]    Support coils, for the radial support of resiliently expanded tubing material, are readily known in the art, and are used to maintain pre-assembled structure, for example, insulating tubes and socket members in an expanded state before final assembly. Insulating tubes and socket members are used for the electrical insulation or sealing of electrical components in the energy industry, such as cable couplings or cable connectors, for example. Because high voltages of over 100 kV, for example, can be applied to these components, the insulating tubes are developed with thick walls and manufactured from materials that insulate well, such as silicone, for example. Such tubing materials, so-called cold shrink tubing, should resiliently match the outer contours of the component to be insulated and enclose it with no gaps if possible. Therefore, the tubing material is expanded resiliently up to 4 times its diameter before assembly. The electrical and other components can therefore be easily inserted into the tubing material. 
         [0004]    In order to keep the tubing material in its expanded state until it is assembled, a supporting body in the form of the above-mentioned support coil is inserted into the tubing material, which absorbs the restoring force of the tubing material that is present due to the resilient expansion. To assemble, the component that is to be enclosed is positioned inside the support coil, which has a hollow interior. Then the support coil must be removed from the tubing material so that the tubing material can shrink around the component. 
         [0005]    In order to be able to remove the support coil, which is tightly enclosed by the tubing material, upon which pressing forces of up to 10 bar, for example, can be applied, manually from the tubing material, support coils of the above-mentioned type have proved themselves. This type of support coil can be dismantled in stages in a longitudinal direction by unwinding the extruded profile body, in that the unwound extruded profile body pulled out by the hollow support coil. When the support coil is dismantled in stages in this way the tubing material shrinks around the component to be insulated by itself. In this way, the support coil can be removed manually from the tubing material without further tools or devices. 
         [0006]    Consequently, the support coil of the stated type must on one hand be able to constantly withstand high pressure emanating from the expanded tubing material and on the other be manually removable from the tubing material by pulling the extruded profile body out. Furthermore, it is important for the support coil that there is enough overall space available inside the interior of the support coil, due to a wall thickness that is as thin as possible, to insert the component to be enclosed. 
         [0007]    In order to fulfill these requirements, the front faces of the wound extruded profile body are connected to each other and joined together in the known support coils in a material-uniting manner, for example, by welding or gluing. The front faces to be connected are also formed so that they link into each other. 
         [0008]    Known support coils are described for example in U.S. Pat. No. 5,087,492, EP 0 619 636 A1, WO 93/22816, WO 83/00779, DE 19820634 C1, EP 0399263 A2, U.S. Pat. No. 5,670,223 and WO 96/24977. 
         [0009]    Generic support coils, for example U.S. Pat. No. 5,670,223, are based on the principle that the elements of the tongue and groove arrangement or the ratchet arrangement of the adjacent turns that are to be connected to each other are connected to each other frictionally, so that no substantial reduction of the interior space being kept free by the support coil can take place substantially through the resilient restoring force of the expanded tubing material that is being applied from the outside. This requirement, however, is in opposition to the endeavor of manually removing the extruded profile body easily from the tubing material. Whilst for the first issue an intimate connection of adjacent turns is desirable, it is actually a hindrance to the second issue. Furthermore, variations in the dimensional accuracy, particularly of the tongue and groove or ratchet arrangements, lead to a non-uniform connection. The releasing forces needed for the manual unwinding of the extruded profile body can sometimes vary greatly due to these non-uniform connections, so that the separation of the connected front faces can be made more difficult or manually impossible when the support coil is being dismantled, or the tubular support coil can fail and break under the pressure of the resiliently expanded tubing material. On the other hand, the support coil must also reliably take up the high restoring forces of the expanded tubing material without this making the removal of the support coil more difficult or even impossible in the process. 
       SUMMARY 
       [0010]    It is an object of the present invention to provide an improved support coil in comparison to the prior art, which is inexpensive to produce, reliably withstands the pressing forces being applied radially from outside and can easily be dismantled manually with low releasing force, and removed from the tubing material. 
         [0011]    It is proposed to achieve this object of the present invention by improving the generic tubular support coil with a rotation prevention means, through which adjacent turns are held secure against rotation. 
         [0012]    It is further an object of the invention to provide a support coil for radial support of resiliently expanded tubing material, made from at least one extruded profile body wound into a plurality of turns, the end faces of the extruded profile body being connected to each other at least in portions in the longitudinal direction of the support coil and interlocked by a ratchet arrangement in the longitudinal direction and by a tongue and groove arrangement in a radial direction, wherein a rotation prevention means, through which adjacent turns are held secure against rotation. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         [0013]    The invention will be explained below in greater detail with reference to the exemplary embodiments shown in the accompanying drawings. Similar or corresponding individual parts of the subject according to the invention are provided with the same reference numerals. In the drawings: 
           [0014]      FIG. 1  shows a schematic view of an embodiment by way of example of a support coil according to the invention; 
           [0015]      FIG. 2  shows a schematic sectional view of the detail A of  FIG. 1 ; 
           [0016]      FIG. 3  shows a schematic view of the extruded profile body of  FIGS. 1 and 2  in cross-section; 
           [0017]      FIG. 4  shows a schematic view of a tubing arrangement according to the invention with the support coil from  FIG. 1 ; 
           [0018]      FIG. 5  shows a schematic, perspective, side view of a second embodiment of a support coil; 
           [0019]      FIG. 6  shows a perspective side view of a third embodiment of a support coil according to the invention; 
           [0020]      FIG. 7  shows a fourth embodiment of the support coil according to the invention, in a corresponding to that according to  FIG. 6 ; 
           [0021]      FIG. 8  shows an enlarged view of the detail D drawn in  FIG. 7 ; 
           [0022]      FIG. 9  shows a fifth embodiment of the support coil according to the invention in the view shown in  FIGS. 6 and 7 ; 
           [0023]      FIG. 10  shows a perspective side view of a sixth embodiment of the support coil according to the invention; 
           [0024]      FIG. 11  shows an enlarged view of the detail F drawn in  FIG. 10 ; 
           [0025]      FIG. 12  shows a perspective side view of a seventh embodiment of the support coil according to the invention; 
           [0026]      FIG. 13  shows an enlarged longitudinal section through the embodiment shown in  FIG. 12 ; 
           [0027]      FIG. 14  shows a perspective side view of an eighth embodiment of the present invention and 
           [0028]      FIG. 15  shows an enlarged view of the detail E drawn in  FIG. 14 . 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS  
       [0029]      FIGS. 1-4  show a support coil  1  according to a first embodiment of the present invention. As shown in  FIG. 1 , the support coil  1  consists of an extruded profile body  2  wound in a winding direction W to form a plurality of windings  33 . A free end  9  of the windings  33  extends from the support coil  1 . The extruded profile body  2  is a substantially continuous member produced, for example, by extrusion. The extruded profile body  2  may be formed from a flexible and solid material, such as a plastic material, so that the support coil  1  is able to withstand radially inwardly acting compressive forces D. The support coil  1  has a length of about 30-50 centimeters; however, the support coil  1  may theoretically be produced to have an infinite length. 
         [0030]    The support coil  1  extends in a longitudinal axis L. The support coil  1  is substantially tubular and has a radial external surface  5  and a radial internal surface  6 . The external surface  5  and the internal surface  6  are formed substantially parallel to each other in cross-section and form a substantially cylindrical external circumferential surface and a substantially cylindrical internal circumferential surface, respectively, of the support coil  1 . Although the support coil  1  is shown and described as having a substantially circular cross-section, it will be appreciated by those skilled in the art that the support coil  1  may have other cross-sectional configurations, for example, the cross-section may be oval or square. 
         [0031]    Each of the windings  33  of the extruded profile body  2  has end faces  3 ,  4  that extend substantially parallel to each other. As shown in  FIG. 3 , the end face  3  has a tongue  10  and a ratchet mount  13 . The tongue  10  forms the ratchet mount  13  in certain portions. The tongue  10  projects in the longitudinal axis L in cross-section and is at a distance a 1  from the external surface  5 . Between the external surface  5  and the tongue  10 , the end face  3  extends substantially perpendicularly to the external surface  5  and the internal surface  6 . The tongue  10  has a radial thickness I 6 . The tongue  10  has a radially outwardly outer holding face  22 ′ having a substantially circular contour with a radius R about a center point M. The substantially circular contour of the outer holding face  22 ′ extends about a quarter of a full circle over about 90 degrees so a protruding length I 1  of the tongue  10  is identical or substantially similar to the radius R. The tongue  10  has a radially inwardly inner holding face  22  that extends substantially in the longitudinal axis L parallel to the external and internal surfaces  5 ,  6 . The inner holding face  22  has a step that forms a counter-holding face  16  that is part of a substantially rectangular channel formed by the ratchet mount  13 . The ratchet mount  13  has a depth I 2  relative to the radially inwardly side of the tongue  10  and a depth I 3  relative to the internal surface  6 . The depth I 3  is greater than the depth I 2 . The ratchet mount  13  has a width b 2 . 
         [0032]    As shown in  FIG. 3 , the end face  4  opposes the end face  3  and has a groove  11  and a ratchet element  12 . The groove  11  is formed so as to be substantially complementary to the tongue  10 . The groove  11  has a radially outwardly outer counter-holding face  23 ′ having a substantially identical circular contour to the outer holding face  22 ′. The groove  11  has a depth I 11  in the longitudinal axis L that is substantially identical to the length I 1  of the tongue  10 . The groove  11  is set apart from the external surface  5  by a distance a 2 , which is substantially identical to the distance a 1 . The groove  11  is delimited radially inwardly by an inner counter-holding face  23  formed on a projection  14  that protrudes in the longitudinal axis L. The projection  14  is connected to the ratchet element  12 . The projection  14  has a radial thickness I 4 . The radial thickness  14  of the projection  14  is less than a radial thickness I 5  of the extruded profile body  2  and less than the radial thickness I 6  of the tongue  10 . The projection  14  is therefore the region on the extruded profile body  2  with the lowest radial thickness and thus forms a weakened region  30 . An opening to the groove  11  has a radial thickness I 7 , which is substantially identical to the radial thickness I 6  of the tongue  10 . The ratchet element  12  at the end of the projection  14  has a substantially rectangular configuration and has a radial thickness I 13  which is substantially identical to the depth I 3  of the ratchet mount  13 . Relative to the projection  14 , the ratchet element  12  protrudes radially outward by a length I 12  to form a holding face  15 . The length I 12  is substantially identical to the depth I 2  of the ratchet mount  13 . The ratchet element  12  has a width b 1  in the longitudinal axis L that is less than the width b 2  of the ratchet mount  13 . Both the ratchet element  12  and the projection  14  extend radially internally flush in the longitudinal axis L. 
         [0033]    As shown in  FIG. 2 , the tongue  10  and the groove  11  form a tongue and groove arrangement, and the ratchet element  12  and the ratchet mount  13  form a ratchet arrangement  12  wherein both the tongue and groove arrangement and the ratchet arrangement  12  engage to join the end faces  3 ,  4  of adjacent windings  33  together with respect to the longitudinal axis L of the support coil  1 . The end faces  3 ,  4  of the extruded profile body  2  are therefore locked together in a radial direction. More specifically, as the ratchet element  12  on the end face  4  engages with the ratchet mount  13  on the end face  3 , the holding face  15  of the ratchet element  12  rests against the counter-holding face  16  of the ratchet mount  13  so that the end faces  3 ,  4  of the extruded profile body  2  are locked in the longitudinal axis L thereby preventing separation of the end faces  3 ,  4  by a tensile force Z. The holding face  15  and the counter-holding face  16  are both oriented substantially perpendicularly to the longitudinal axis L. As the width b 1  and the cross-sectional surface area of the ratchet element  12  are smaller than the width b 2  and the cross-sectional surface area of the ratchet mount  13 , the ratchet mount  13  has a deflection region  17  in the form of an opening, which is not filled by the ratchet element  12 . The tongue and groove arrangement, the end faces  3 ,  4  and/or the ratchet arrangement  12  may additionally be at least partially bonded or welded together. 
         [0034]      FIG. 2  shows in phantom the extruded profile body  2 ′ during the separation of adjacent windings  33  of the support coil  1 . When the free end  9  of the windings  33  shown in  FIG. 1  is manually pulled, a detachment force Fz acts on the windings  33 . The windings  33  of the support coil  1  are rotated radially inwardly in a detachment direction LR. This rotation is carried out substantially about an instantaneous center of rotation (the pivot point M). During this movement, the end faces  3 ,  4  on the radially outer side move apart from each other and form a radially inwardly tapering gap  34 , as shown in  FIG. 2 . On the radially inner side, the rotational movement in the detachment direction LR away from the counter-holding face  16  causes the ratchet element  12  to be pressed into the deflection region  17 . The ratchet element  12  is pressed radially outwardly against the ratchet mount  13 , so the projection  14 , which, as a result of the lowest thickness I 4 , has the greatest deflectability on the extruded profile body  2 ′, is elastically deformed. As the radially outer contour of the tongue and groove arrangement extends about the pivot point M, the tongue  10  moves smoothly out of the groove  11 , as the outer counter-holding face  23 ′ slides on the outer holding face  22 ′. Thus, the detaching force Fz can easily be manually applied, because merely a force for resiliently bending the projection  14  in the weakened region  30  and frictional forces in the tongue and groove arrangement have to be applied in order to detach the extruded profile body  2 ′. 
         [0035]      FIG. 4  shows the coil support  1  used in a tube arrangement  7 . In the tube arrangement  7 , a resiliently expanded tube material  8 , such as an insulating tube or sleeve body used for electrically insulating electrical components, is radially expanded by the support coil  1 . The tube material  8  may be, for example, a resilient electrically insulating material, such as silicone. In order to be able to easily position the tube material  8  around the electrical component (not shown), the tube material  8  is expanded by the support coil  1 . The electrical component (not shown) is then inserted into the support coil  1 . The support coil  1  is then unwound by pulling on the free end  9  of the extruded profile body  2  with the tensile force Fz. The windings  33  of the extruded body  2  are withdrawn from the tube arrangement  7  in the longitudinal axis L. As the windings  33  of the extruded body  2  are removed from the tube material  8 , the expanded tube material  8  contracts around the electrical component (not shown), as shown schematically on the right-hand side of  FIG. 4 . 
         [0036]    The present invention is derived from the consideration that the substantial supporting and retaining forces are held by the tongue and groove connection or ratchet arrangement  12  in the axial and radial directions, as described above. However, other embodiment, shown in  FIGS. 5-15 , provide a rotation prevention means through which adjacent windings  33  are held secure against rotation, so that the adjacent windings  33  are prevented from slipping apart, which would eventually lead to a reduction in the diameter of the support coil  1 . 
         [0037]      FIGS. 5-15  show further embodiments of an extruded profile body  2  of a support coil  1  according to the present invention. Since the additional embodiments of the extruded profile body  2  of the support coil  1  are substantially identical to the extruded profile body  2  of the support coil  1  according to the first embodiment of the present invention, identical elements will be described using the same reference numerals hereafter and only the differences there between will be described in greater detail. 
         [0038]      FIG. 5  shows a sectional view of an embodiment very similar to the embodiment shown in  FIG. 5 . Identical elements are given the same reference numerals. The outer surfaces of the individual windings  33  are shown at least partially, as well as the sectional surfaces of the respective extruded profile body  2 . 
         [0039]    The radially outer part, of the end faces  3 ,  4  of the two extruded profile bodies  2 , is provided with a friction-increasing irregularity in the form of flute-like shape profiling  101 . There are corresponding flute troughs  102  and flute peaks  103  on opposite end faces  3 ,  4 . Between the flute troughs  102  and the flute peaks  103  of an end face  3 ,  4  there is a plateau  104 , which extends in an axial direction of the support coil  1 . 
         [0040]    The friction-increasing irregularities, such as flute-like shape profiling  101 , made up of the flute troughs  102 , flute plateaus  104  and flute peaks  103 , can be created during the manufacture of the extruded profile body  2 , which is usually formed from plastic material, through forming and/or grinding processes. In the case of forming processing, for example, the stamping of the irregularities may be accomplished by a knurling wheel onto the extruded profile body  2  that is initially extruded as continuous material. 
         [0041]    The friction-increasing irregularities can just as well be created by the sand blasting of the end faces  3 ,  4  later when they are located next to each other in their joined state. The actual configuration of the irregularities on the outer circumferential surface and/or end faces  3 ,  4  is at the discretion of skilled in the art. The person skilled in the art will select suitable profiling  101 , particularly on the basis of the properties of the resiliently expanded tubing material, which has a sufficiently positive locking effect for the formation of a rotation prevention means without damaging the resiliently expanded tubing material or even cutting through it. The tubing material to be resiliently laid onto the support coil  1  is laid onto these irregularities on the outer circumferential surface. A corresponding mechanical clamping takes place between the tubing material and the support coil  1 . 
         [0042]    The profiling  101 , made up of the flute troughs  102 , flute plateaus  104  and flute peaks  103 , is provided over the whole circumferential surface between the two end faces  3 ,  4 . 
         [0043]    When the support coil  1  is disassembled, by the removal of the individual coils, i.e. windings  33  of the extruded profile body  2 , through the support coil  1 , the extruded profile body  12  in unwinding direction is first bent radially inwards so that the end faces  3 ,  4  come apart, particularly in the region of the profiling  101 . Disassembling the support coil  1  is enhanced by the particular arrangement of the ratchet arrangement  12 ,  13  on one hand and the tongue and groove arrangement  10 ,  11  on the other—as described above. 
         [0044]    The friction-increasing irregularities on the front faces and also the friction-increasing irregularities on the outer circumferential surface of the wound extruded profile body  2  have the effect of increased mechanical interleaving of the individual parts of the tubular support coil  1  and the tubing material, so that the individual windings  33  of the wound extruded profile body  2  can no longer slip or slide relative to each other. A greater accuracy of the desired outer diameter of the support coil  1  is ensured by the measures taken. The previously mentioned measures can be provided in combination with each other. 
         [0045]    A corresponding rotation prevention means provided on the end faces  3 ,  4  can also be combined with other rotation prevention means provided on the inner circumferential surface and/or the outer circumferential surface of the support coil  1 , if desired. 
         [0046]    In the case of the embodiments shown in  FIGS. 6 to 8 , different supporting bodies are provided. 
         [0047]    In the case of the embodiment shown in  FIG. 6 , a tubular adhesive film  105 , which is first shown in the figure in unexpanded state, is inserted into the support coil  1 . This tubular adhesive film  105  can be expanded radially outwards, by an internal pressure for example, and rested on the inner circumferential surface of the support coil  1 . The supporting body, tubular adhesive film  105 , extends over the whole axial length of the coil  1  and bridges all of the windings  33 . By laying the film  105  on the inner circumferential surface the windings  33  are prevented from moving relative to each other. The windings  33 , of the wound extruded profile body  2 , retain their original diameter. 
         [0048]    The adhesive film  105  is preferably provided on the inner circumferential surface of the wound extruded profile body  2 , so that the adhesive film  105  can be pulled off from the inside before the support coil  1  is dismantled. The adhesive film  105  preferably has a tear-off tag for this purpose, which sticks out at least on one front side of the tubular support coil  1  and can easily be gripped by the user in order to remove the adhesive film  105 . 
         [0049]      FIGS. 7 and 8  show another embodiment, having a rotation prevention means, in which a plurality of grooves  106  are recessed in the inner circumferential surface of the support coil  1  in the circumferential direction. The grooves  106  extend in an axial direction related to the support coil  1  and run through the support coil  1 . Rectangular rods  107  are inserted into the grooves  106  respectively as supporting bodies. The rectangular rods  107  run through the whole support coil  1 , protruding beyond the support coil  1  at both ends. The rectangular rods  107  can accordingly be gripped at both of their protruding ends and be expelled from the grooves  106  in order to remove the positive securing of the diameter of the support coil  1 . 
         [0050]    As can be seen particularly in  FIG. 8 , the contour of the rod  107  is adapted to the contour of the groove  106 , so that the rod  107  is retained in the groove  106  by being clamped. The rods  107  can, of course, be welded, glued or secured in other possible ways in the groove  106 . The rod  107  may be formed by a metallic wire, which is kept in a the groove  106  formed during insertion of the hot wire in a plastic material of the wound extruded profile body  2  by melting and setting. 
         [0051]    The supporting body in the embodiment shown in  FIG. 9  is formed by welded webs  108  attached in a longitudinal direction. These welded webs  108  are welded onto the plastic material of the support coil  1 . The adjacent windings  33  of the wound extruded profile body  2  of the support coil  1  are also secured relative to each other by overlay welding  108 . 
         [0052]    It must be ensured that the weld connection is carried out in the process so that it can be loosened by manual gripping of the rod  107  and the rod  107  can be removed from the extruded profile body  2 . 
         [0053]    The rod  107  inserted into the groove  106  can also be stuck in the groove  106  by a slight twisting of individual windings  33 . During this procedure, the extruded profile body  2  is first manufactured by turning up the windings  33 . Then a recess opening is created by mechanical processing on the inner and/or outer circumferential surface of the extruded profile body  2 . The rod  107  is inserted into this groove  106 . After that, the extruded profile body  2  is twisted slightly as a whole, so that the individual windings  33  push against each other, through which action the rod  107  is stuck on the border between adjacent windings  33 , where a gap in the groove  106  is visible. Alternatively, the groove  106  can also be created during the manufacture of the extrusion from which the extruded profile body  2  is made. This procedure is especially suitable for the mass production of extruded profile bodies  2  with identical diameter. The groove  106  is formed along the whole length by the coiling of the windings  33  during the manufacture of the wound extruded profile body  2  in an axial direction. 
         [0054]    The rod  107  may also include a cutting edged, which is capable of cutting into the material that forms the wound extruded profile body  2 . 
         [0055]      FIGS. 10 and 11  show another embodiment, in which the individual windings  33  of the support coil  1  are interspersed with recessed openings  109 . The recessed openings  109 , of all the windings  33 , are formed in an axial direction in relation to recesses extending the support coil  1 . In the embodiment shown, the support coil  1  has a large number of recesses distributed along the circumference, which open towards the front face of the support coil  1 . In the case of the embodiment shown, a rod  110  has been inserted into one of the recess openings  109 , acting as another rotation prevention means. The rod  110  has an eyelet  111  formed at one end, by being bent round, which makes gripping the rod  110  easier for pulling it out of the support coil  1 . The other end of the rod  110  is straight. The other end can, however, be bent round to secure the extruded profile body  2  during transportation and oriented by bending substantially coaxially to the part of the rod  110 , which is in the recess before the removal of the rod  110 , so that it can be pulled out of the recess. It is also possible to configure the rod  110  slightly fluted, at least in the region of the recess, so that it rests resiliently on the walls of the recessed opening  109  and held in place inside the extruded profile bodies  2  so it cannot be lost, but can still be manually removed. 
         [0056]    In the case of the alternative embodiment according to  FIGS. 12 and 13 , a rotation prevention means is provided in the form of a band  112 , which is arranged inside the hollow support coil  1  and is laid as a loop  113 . One end of the band  112  projects from the front face end of the support coil  1  as an end  114  on the attachment side. From there, the band  112  goes through the support coil  1  with its attachment portion  115  and comes out at the opposite end of the coil  1 . To form the loop  113 , the band  112  is bent round at this end through 180° and fed through the support coil  1  in the other direction to the attachment portion  115 . A free end  117  of the band  112  protrudes from the end  114  on the attachment side and forms a handling portion  118 , which projects beyond the front face end of the support coil  1 . 
         [0057]    The attachment portion  115  of the band  112  is connected to the inner circumferential surface of the support coil  1  by a welded or glued connection. This material-uniting or non-positive connection is indicated by the reference numeral  119  in  FIG. 13 . The connection  119  is formed such that the band  112  can be freed from the support coil  1  in the direction of the arrow P away from the support coil  1  by manual gripping and pulling on the handling portion  118  and pulled out of it. 
         [0058]    The removal of the band  112  is simplified particularly in that the two ends  114 ,  117  of the band  112  are provided on the same front end of the extruded profile body  2 . This leads to a configuration in which an attachment portion  115  of the band  112 , which is connected to the inner circumferential surface of the extruded profile body  2 , and which is preferably connected to all of the windings  33 , is fed through from the front face through the support coil  1  and is bent round at 180° into a loop  113  at the opposite end. By pulling on the handling portion  118 , the band  112  is bent in the region of a connection between the attachment portion  115  and the extruded profile body  2 . During removal, the loop  113  travels through the support coil  1 , causing deformation and an upward force applied behind the loop  113 , and leads to dissolution of the connection  119 . Afterwards, the rotation prevention means provided by the band  112  is removed. 
         [0059]    The band  112  can be made from a textile for example, or from a plastic material. The configuration made with plastic material offers an advantage that the band  112  can be welded to an extruded profile body  2 , which is also made from plastic material. 
         [0060]    The handling portion  118  can have particular functional surfaces in the form of friction-increasing regions for this purpose and/or thickened regions, which enable a good grip of the handling portion  118 . 
         [0061]    Configurations, which make manual gripping easier, are intended here in particular. Counter functional surfaces can, however, just as well be provided for hand-operated tools, which cooperate with them. Eyelets or holes are intended, for example, in which the functional surface of a hand tool can engage. 
         [0062]    In the case of the embodiment shown in  FIGS. 14 and 15 , irregularities in the form of flutes  109  are again provided on the outer circumferential surface of the wound extruded profile body  2 , and serve as another type of rotation prevention means. As  FIG. 19  shows, the flutes  109  do not pass through in an axial direction, as in  FIGS. 10 and 11 . Rather, adjacent flutes  109 , which can be configured as sharp-edged teeth or vanes, are usually non-forcibly offset when the individual windings  33  are coiled up. The flutes  109  are formed relatively softly in the embodiment shown (cf.  FIG. 15 ). The resiliently expanded tubing material is laid onto this contouring on the outer circumference of the support coil  1  in a stressed state, and usually shapes itself plastically locally according to the contours of the flutes  109  and therefore also secures the adjacent windings  33  against each other positively.