Abstract:
A raceway for fastening, guiding and/or protecting an electric cable means has channel modules with longitudinal channel sections. At least two essentially longitudinal channel sections are movable telescopically into one another by way of complementary male elements or female elements, and each of the essentially longitudinal channel sections is provided with at least one fixation bolt. The male element projects from a part of an open end of one essentially longitudinal channel section and the female element is cut out from a part of an open end of an opposed essentially longitudinal channel section. The essentially longitudinal channel sections are made of thermoplastic material and the at least one fixation bolt is mounted inside the channel section through the base wall of each essentially longitudinal channel section.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to European patent application No. EP 13 400031.4 filed on Nov. 28, 2013, the disclosure of which is incorporated in its entirety by reference herein. 
     BACKGROUND OF THE INVENTION 
     (1) Field of the Invention 
     The invention is related to a raceway for fastening, guiding and protecting electric cable means with the features of the preamble of claim  1 . The invention relates more particularly to the installation of the cabling on aircraft doors, in particular airplanes passenger doors or airplanes cargo doors. 
     (2) Description of Related Art 
     Vehicles, including automobiles, trucks, watercraft, and aircraft, have included electrical cabling for over a century. However, installation of these cables can be tedious and inefficient, due to the requirements of space, weight, and the amount of cabling required. For example, a modern airplane or ship may have more than a hundred miles of electrical wiring. 
     Composites, in particularly Carbon Fiber Reinforced Plastics (CFRP) are applied extensively throughout the fuselage of recently developed airplanes. This extensive use of CFRP raises problems, also relevant looking at the installation of electrical harnesses. 
     The document “Design guidelines: Design Guidelines for Shielding Effectiveness, Current Carrying Capability, and the Enhancement of Conductivity of Composite Materials”, NASA Contractor Report 4784, R. W. Evans, Tec-Masters, Inc.• Huntsville, Ala.; August 1997″ discloses risks of current injection into fiber reinforced composites parts (FRP) caused by damaged insulations of electric cables or cut electric cables where the routing of said cables is close to CFRP parts, leading most likely to undetected structural damages of the FRP and electric cables; e.g. loss of matrix integrity by heat induction. 
     The electric cable installation in doors, i.e. the electrical harness is also exposed to mechanical caused damages, among others since door areas are zones of higher risk of abusive load application. Especially for cargo doors and in cargo loading areas, abusive loads are a big issue since the electrical harnesses are well accessible and are often abused as handle bars. 
     Drilling holes and cut outs lead to disrupted fibers in CFRP structures. Said disrupted fibers cause losses in the strength properties of the CFRP structures and are cost increasing too, due to machining time and drilling tool deterioration. Therefore, drilling holes and cut outs for cable through routing should be avoided or at least reduced on CFRP structures, especially in areas, where the structure is highly loaded. Equally high numbers of rivets, needed for known harness fastening, destroy the carbon fibers. 
     Some standard parts, such as support clamps for electric cables provide for some protection against current injection but imply many drilling holes on CFRP structures and are not suited for mechanical protection. Harnesses provide for mechanical and/or electrical protection without any solution for the number of drilling holes on CFRP structures. 
     The document U.S. Pat. No. 3,792,189 A discloses a raceway for housing and protecting electric cable means along structural parts. The raceway comprises at least two essentially longitudinal housings each with a base wall integral with essentially parallel side walls. Said base wall and said side walls provide a cable canal open at opposed ends of each of said at least two essentially longitudinal housings. Said at least two essentially longitudinal housings are movable telescopically into one another at said open end by means of complementary male element or female element means and each of said essentially longitudinal housings is provided with at least one fixation bolt to the housing. 
     The document GB 200324766 A (GB 2407439 A) discloses a device providing a protective sleeve around a bundle of one or more cables and bridging gaps between raceway sections. The device comprises a substantially flat, bendable web portion, having at least one opening adjacent one edge and a guide, slidable through the at least one opening, projecting from the opposite edge. The device is preferably formed from a single component, and is formed from PTFE. 
     The document U.S. Pat. No. 5,271,585 discloses a fiber optics cable raceway formed of main channel members and telescope members. The main channel members have a generally U-shaped cross-section with a base, sides, and, at the top, inwardly extending lips. The telescope members have the same cross-section, but are slightly larger so they can fit about the main channel members for a longitudinally sliding fit. By alternately, interfitting main members and telescope members and adjusting the length by telescopic sliding, a raceway of the desired length can quickly be assembled. Small locking clips can then be fitted about the respective overlapping lips of two members to prevent further sliding. The raceway can be installed below the floor by the use of brackets hanging on pre-existing floor-supporting pedestals. It can be installed above a dropped ceiling by the use of hangers clamped to the grid struts of the ceiling. The locking clips serve to electrically interconnect the channel members and the telescope members. 
     French patent application FR 2 481 015 A1 discloses a cable raceway formed by individual elements, each made by injection and comprising a lower part, side walls and, optionally, an upper part, the individual elements being attached by means of an extension in one of the element that fits into a housing of the adjacent element. 
     Likewise, French patent application FR 2 680 206 A1 discloses another cable raceway formed by a plurality of elements having an U-shape cross section and being linked by the fitting of one element&#39;s extension into another element&#39;s slide channel. 
     Utility model DE 70 15 776 U and UK patent application GB 2 399 694 discloses yet further cable raceways in which the elements may be locked by introducing a protrusion into the next element&#39;s housing. 
     BRIEF SUMMARY OF THE INVENTION 
     It is an objective of the invention to provide an improved raceway for protecting electric cable means with less required attachment provisions. It is a further objective of the invention to provide a method of mounting said raceway to a structural part and of mounting the electric cable means into the raceway. 
     The solution is provided with a raceway for electric cable means with the features of claim  1  of the invention. A further solution is provided with a method of mounting said raceway to a structural part and mounting the electric cable means into the raceway with the features of claim  9  of the invention. Preferred embodiments of the invention are provided with the subclaims. 
     According to the invention a raceway for fastening, guiding and/or protecting electric cable means along or on top of structural parts, particularly along or on top of structural parts of an aircraft, comprises at least two channel modules each with essentially longitudinal channel sections with a base wall integral with essentially parallel side walls. Said base wall and said side walls provide a channel section open at both ends of each of said at least two essentially longitudinal channel sections. Said at least two essentially longitudinal channel sections are movable telescopically during installation, into one another at said open ends by means of complementary male element or female element means. 
     Each of said essentially longitudinal channel sections is provided with at least one fixation bolt for fixation of the at least two essentially longitudinal channel sections relative to each other and to the structural parts while at least one of said essentially longitudinal channel sections is provided with at least two fixation bolts for fixation of the at least two essentially longitudinal channel sections relative to each other and to the structural parts. Said at least one essentially longitudinal channel section provided with at least two fixation bolts for fixation of the at least two essentially longitudinal channel sections relative to each other and to the structural parts is preferably arranged at an end of the inventive raceway. 
     The invention provides a raceway for fastening, guiding and protecting electric cable means that allows the installation of the raceway itself on the structural parts and the installation of the electric cables, e.g. as harnesses, in the at least two essentially longitudinal channel sections with comparatively low effort and eases the maintenance of the harness of said electric cables. The invention provides maximal protection properties for the electric cable combined with less required attachment provisions to any CFRP structure and reduced assembling effort in general. 
     According to a further aspect of the invention said male element means are projecting from a part of an open end of one essentially longitudinal channel section and said female element means are spared from a part of an open end of an opposed essentially longitudinal channel section, said essentially longitudinal channel sections being made of thermoplastic material. 
     The inventive raceway provides extended mechanical protection for any electric cable mounted inside the channel section and continued electrical isolation due to the use of thermoplastics, e.g. the use of isolating polymers and the overlapping of the channel sections. 
     The inventive raceway provides for the minimized attachment effort with less holes and attachment parts, e.g. rivets, bolts, etc. and the inventive raceway thus avoids disrupted fibers in CFRP structures caused by drilling holes and cut outs. Consequently the inventive raceway limits the deterioration of the strength properties of the concerned CFRP structures by avoiding drilling holes and cut outs for cable through routing on CFRP structures. As a consequence the invention provides potential for structural weight reduction of the concerned CFRP structures. 
     Any rotation of a channel section of the inventive raceway is locked by means of just one fixation bolt plus the fixation by the neighboring channel sections. In that way the neighboring parts lock each other except preferably at the start/end of a line of a channel section, conducted straight or curved, where at least one additional fixation bolt is needed for rotation locking of said channel section. The routing of the inventive raceway—straight or curved—is totally controllable over lifetime and sagging and/or swelling is not an issue at all. 
     The inventive raceway provides a modular system with regard to parameters such as size, length and material to cover the needs of different geometrical environments with a low number of different channel sections, said channel sections being easily processed. 
     The inventive raceway allows compensation of significant in/decrease of length depending on the material humidity and the used thermoplastic material due to the telescopic feature providing compensation for unintentionally elongated or shortened channel sections. 
     The inventive raceway avoids the risk of current injection caused by damaged cable insulation or cut cables even if said cables are close to the CFRP parts of the aircraft, and thus prevents undetected structural damages; e.g. loss of matrix integrity by heat induction. The inventive raceway further avoids load application directly to the harness by surrounding rigid channel sections with a base wall and side walls adapted to the cable means along the inside of the channel sections. 
     The inventive raceway provides fixation, mechanical and electrical protection at once without additional line guidance with the advantage of reduced weight, reduced assembling effort and low mounting effort for the cables onto the raceway. 
     Along the channel sections of the inventive raceway pairwise slots are integrated for electric cable/harness fixation to the channel sections by tying means. The pairwise slots are distant to each other along the channel sections of the inventive raceway. 
     According to a preferred embodiment of the invention said complementary male element and female element means are provided with telescopic length compensation while continuous electrical and mechanical protection is provided because of the overlapping telescope principle on one side combined with one bolt fixation at the opposite side of the channel section. 
     According to a still further aspect of the invention preferably one fixation hole is mounted inside essentially straight channel sections through said base wall of each essentially longitudinal channel section, whereas curved or straight channel sections and channel sections at ends of the inventive raceway are provided with two fixation holes i.e. one fixation hole next to each of two ends of curved or straight and end channel sections. 
     According to a preferred embodiment of the invention a method of mounting the raceways to the structural part and mounting the electric cable means into the raceway comprises the steps of:—Providing tying means, e.g. plastic clips, with free ends, —Providing channel sections with pairwise slots respectively next to each of side walls through the base wall to a clearance in the base wall, each of said channel sections having female element means and male element means at opposed ends, —Passing the free ends from the clearance through each of the pairwise slots and extending said free ends towards the open top of the channel sections, —Mounting at least two of said essentially longitudinal channel sections with one passed through plastic clip per pairwise slot along or on top of the structural part while compensating length variations by inserting the female element means more or less far into the male element means, —Mounting each of the respective channel sections after fixation through the at least one hole to or on top of the structural part, —Inserting the electric cable means along the raceway through the open top into the longitudinal channel sections between the free ends of the plastic clips, and—Joining and tightening the free ends of the tying means about the electric cable means. 
     The inventive method allows particularly cost efficient mounting of composite raceways with enhanced adaption potential at reduced constructive effort, said raceway fastening, guiding and protecting electric cable means mounted inside the longitudinal channel sections. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       Preferred embodiments of the invention are presented by means of the following description with reference to the attached drawings, from which in 
         FIG. 1  a lateral view of two channel sections of a raceway according to the invention is shown, 
         FIG. 2  a cross-sectional view of one channel section of the raceway of  FIG. 1  is shown, 
         FIG. 3  a perspective view of one channel section with male element means of the raceway of  FIG. 1  is shown,  FIG. 4  a perspective view of one channel section with female element means of the raceway of  FIG. 1  is shown, 
         FIG. 5  a lateral view of two channel sections of a preferred raceway according to the invention is shown, 
         FIG. 6  a frontal view of one channel section of the preferred raceway of  FIG. 5  is shown, 
         FIG. 7  a cross-sectional view of one channel section of the preferred raceway of  FIG. 5  is shown, 
         FIG. 8  a perspective view of one channel section with female element means of the preferred raceway of  FIG. 5  is shown, 
         FIG. 9  a further perspective view of one channel section with male element means of the preferred raceway of  FIG. 5  is shown, 
         FIG. 10  a frontal view of another channel section according to the invention is shown, 
         FIG. 11  a perspective view of said another channel section with female element means according to the invention is shown, 
         FIG. 12  a further perspective view of said another channel section with male element means according to the invention is shown, 
         FIG. 13  a lateral view of two channel sections of the raceway according to the invention is shown, 
         FIG. 14  a frontal view of still another channel section according to the invention is shown, 
         FIG. 15  a perspective view of said still another channel section with female element means according to the invention is shown, 
         FIG. 16  a further perspective view of said still another channel section with male element means according to the invention is shown, 
         FIG. 17  a side view and a top view of an incident straight channel module according to the invention are shown, 
         FIG. 18  top views of an incident curved channel modules according to the invention are shown, 
         FIG. 19  two side views and two top views of straight end channel modules according to the invention are shown, and 
         FIG. 20  top views of an curved end channel modules according to the invention are shown. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     According to  FIG. 1  a raceway  1  comprises a channel module  2  with two channel sections  2 A,  2 B aligned along a common longitudinal axis and facing each other with respective ends at a junction area  6 . The two channel sections  2 A,  2 B are made of polyamide or any other thermoplastic material. The respective ends are essentially planar, rectangular and perpendicular with regard to the common longitudinal axis of the two channel sections  2 A,  2 B. The channel sections  2 A,  2 B extend essentially longitudinally including curved and bifurcated shapes. E.g. a curved channel section  2 A,  2 B encloses an angle of 90°. 
     Essentially cubic male element means  3  are provided at one end of the channel section  2 A. Corresponding cubic female element means  4  as a complement to the essentially cubic male element means  3  are provided at the end of channel sections  2 B. The channel sections  2 A,  2 B are each provided with cubic female element means  4  at one end and complementary cubic male element means  3  at the opposed end for the provision of a modular construction system. 
     With a distance of 15-35 mm to one end of each of the two channel sections  2 A,  2 B a hole  5  for a fixation bolt (not shown) with a diameter of 4-7 mm is provided in a base wall  7  for fixation of each of the channel sections  2 A,  2 B to a structural part, particularly for fixation along at least a door of an aircraft (not shown). 
     A clearance  12  essentially parallel to and below the base wall  7  is provided for tying means  26  for withholding electric cable means  10  (see  FIG. 2 ) inside the channel sections  2 A,  2 B. 
     According to  FIG. 2  corresponding features are referred to with the references of  FIG. 1 . Each of the two channel sections  2 A,  2 B are formed by the base wall  7  and side walls  8 ,  9  raising essentially rectangular with regard to the base wall  7 . The side walls  8 ,  9  leave the channel sections  2 A,  2 B open towards the top. The base wall  7  closes the channel sections  2 A,  2 B towards the bottom except for pairwise slots  11  opening passages inside the channel sections  2 A,  2 B through the base wall  7  respectively next to the side walls  8 ,  9  for the tying means  26  to the clearance  12  below the base wall  7 . The channel sections  2 A,  2 B are shaped semicircular between the base wall  7  and the side walls  8 ,  9  for a proper fitting of electric cable means  10  with an essentially circular cross section for insertion inside the channel sections  2 A,  2 B. The cable means  10  are a single cable in a harness (not shown), a bundle of cables in a harness (not shown) or a bundle of harnessed cables (not shown). A harness diameter ranges from 2-50 mm or preferably from 5-20 mm. 
     According to  FIG. 3  corresponding features are referred to with the references of  FIG. 1, 2 . The channel section  2 A is formed by the base wall  7  and the side walls  8 ,  9  raising essentially rectangular with regard to the base wall  7  for provision of a channel section open at both ends of each of said at least two essentially longitudinal channel sections  2 A,  2 B. Essentially cubic male element means  3  are provided from one end of the channel section  2 A at the bottom along a central section of the base wall  7 . Pairwise slots  11  inside the channel sections  2 A,  2 B through the base wall  7  are respectively located next to the side walls  8 ,  9  for the tying means  26  to the clearance  12  below the base wall  7  (see as well  FIG. 4 ). 
     According to  FIG. 4  corresponding features are referred to with the references of  FIG. 1-3 . The channel section  2 B is formed by the base wall  7  and side walls  8 ,  9  raising essentially rectangular with regard to the base wall  7  for provision of a channel section open at both ends of each of said at least two essentially longitudinal channel sections  2 A,  2 B. The essentially rectangular female element means  4  is provided in one end of the channel section  2 B at the bottom along a central section of the base wall  7  adapted for accommodation of the essentially rectangular male element means  3 . 
     According to  FIG. 5  corresponding features are referred to with the references of  FIG. 1-4 . A preferred channel module  16  comprises two further channel sections  15 A,  15 B for alignment along a common longitudinal axis and facing each other with respective ends at the junction area  6 . The two further channel sections  15 A,  15 B are made of polyamide or any other thermoplastic material. The respective ends are essentially planar, rectangular and perpendicular with regard to the common longitudinal axis of the two further channel sections  15 A,  15 B. 
     Essentially u-shaped female element means  13  (see as well  FIG. 8 ) are provided at one end of the further channel section  15 A. Correspondingly u-shaped male element means  14  (see as well  FIG. 9 ) as a complement to the essentially u-shaped female element means  13  are provided at the end of the further channel section  15 B. The further channel sections  15 A,  15 B are each provided with u-shaped female element means  14  at one end and complementary u-shaped male element means  13  at the opposed end for the provision of a modular construction system. 
     With a distance of 15-35 mm to one end of each of the two further channel sections  15 A,  15 B a hole  5  for a fixation bolt (not shown) with a diameter of 4-7 mm is provided in the base wall  7  for fixation of each of the further channel sections  15 A,  15 B to a structural part  17 , particularly for fixation along at least a door of an aircraft (not shown). 
     The clearance  12  essentially parallel to and below the base wall  7  is provided for tying means  26  for withholding electric cable means  10  (see  FIG. 6, 7 ) inside the further channel sections  15 A,  15 B. 
     According to  FIG. 6, 7  corresponding features are referred to with the references of  FIG. 1-5 . Each of the two further channel sections  15 A,  15 B are formed by the base wall  7  and side walls  8 ,  9  raising essentially rectangular with regard to the base wall  7 . The side walls  8 ,  9  leave the further channel sections  15 A,  15 B open towards the top. The base wall  7  closes the further channel sections  15 A,  15 B towards the bottom except for pairwise slots  11  opening passages inside the further channel sections  15 A,  15 B through the base wall  7  respectively next to the side walls  8 ,  9  for the tying means  26  to the clearance  12  below the base wall  7 . The further channel sections  15 A,  15 B are shaped semicircular between the base wall  7  and the side walls  8 ,  9  for a proper fitting of the electric cable means  10  with an essentially circular cross section for insertion inside the further channel sections  15 A,  15 B. 
     According to  FIG. 8  corresponding features are referred to with the references of  FIG. 1-7 . The further channel section  15 B is formed by the base wall  7  and side walls  8 ,  9  raising essentially rectangular with regard to the base wall  7  for provision of a channel section open at both ends of each of said at least two essentially longitudinal channel sections  15 A,  15 B. Essentially rectangular u-shaped female element means  13  are spared longitudinally along a section of the outside of the base wall  7  and the side walls  8 ,  9  of the further channel section  15 A for accommodation of essentially rectangular u-shaped male element means  14 . 
     According to  FIG. 9  corresponding features are referred to with the references of  FIG. 1-8 . The further channel section  15 A is formed by the base wall  7  and the side walls  8 ,  9  raising essentially rectangular with regard to the base wall  7  for provision of a channel section open at both ends of each of said at least two essentially longitudinal further channel sections  15 A,  15 B. Essentially rectangular u-shaped male element means  14  project longitudinally from one end of the further channel section  15 B with a set off from the outer circumference of the further channel section  15 B. One of the pairwise slots  11  inside the further channel section  15 B passes through the base wall  7  next to the side wall  9  for the tying means  26  to the clearance  12  below the base wall  7  (see as well  FIG. 5, 7 ). 
     According to  FIGS. 10-12  corresponding features are referred to with the references of  FIG. 1-9 . Each of two still further channel sections  19 A,  19 B of another channel module  18  are formed by the base wall  7  and side walls  8 ,  9  raising essentially rectangular with regard to the base wall  7 . The further channel section  19 B is provided with rounded u-shaped male element means  23  projecting longitudinally from one end of the further channel section  19 B with a set off from the outer circumference of the further channel section  19 B. Essentially rounded u-shaped female element means  22  are spared longitudinally along a section of the outside of the base wall  7  and the side walls  8 ,  9  of the further channel section  19 A for accommodation of the essentially rectangular male element means  23 . 
     The respective pairwise slots  11  inside the further channel section  19 A,  19 B pass through the base wall  7  next to the side wall  9  for the tying means  26  to the clearance  12  below the base wall  7  (see as well  FIG. 5, 7 ). 
     According to  FIGS. 13-16  corresponding features are referred to with the references of  FIG. 1-12 . Still another channel module  20  comprises two channel sections  21 A,  21 B aligned along the common longitudinal axis and facing each other with respective ends at the junction area  6 . The two channel sections  21 A,  21 B are made of polyamide or any other thermoplastic material. The respective ends are essentially planar, rectangular and perpendicular with regard to the common longitudinal axis of the two channel sections  21 A,  21 B. Essentially fork type male element means  24  are provided at one end of the channel section  21 A. Corresponding nose type female element means  25  as a complement to the essentially fork type male element means  24  are provided at the end of channel section  21 B. The channel sections  21 A,  21 B are each provided with fork type male element means  24  at one end and complementary nose type female element means  25  at the opposed end for the provision of a modular construction system for the raceway  20 . 
     According to  FIG. 17  corresponding features are referred to with the references of  FIG. 1-16 . The channel modules  2 ,  16 ,  18 ,  20  for insertion in an inclined position of any of the raceways  1  are straight with one fixation hole  5  each next to one end. The channel sections  2 A,  2 B,  19 A,  19 B,  21 A,  21 B are respectively provided with male element means  3 ,  14 ,  23  or  25  at one end and complementary female element means  4 ,  13 ,  22 ,  24  at the opposed end. 
     According to  FIG. 18  corresponding features are referred to with the references of  FIG. 1-17 . The channel modules  2 ,  16 ,  18  or  20  for insertion in an inclined position of any of the raceways  1  are curved with one or more arcs and with one fixation hole  5  each next to one end. The channel sections  2 A,  2 B,  19 A,  19 B,  21 A,  21 B are respectively provided with male element means  3 ,  14 ,  23  or  25  at one end and complementary female element means  4 ,  13 ,  22 ,  24  at the opposed end. 
     According to  FIG. 19  corresponding features are referred to with the references of  FIG. 1-18 . The channel modules  2 ,  16 ,  18 ,  20  for insertion in an end position of any of the raceways  1  are straight with one or two fixation holes  5  each next to one end. The channel sections  2 A,  2 B,  19 A,  19 B,  21 A,  21 B are provided with male element means  3 ,  14 ,  23  or  25  or complementary female element means  4 ,  13 ,  22 ,  24  at one end. 
     According to  FIG. 20  corresponding features are referred to with the references of  FIG. 1-19 . The channel modules  2 ,  16 ,  18  or  20  for insertion in an end position of any of the raceways  1  are curved with one or more arcs and with one or two fixation holes  5  each next to one end. The channel sections  2 A,  2 B,  19 A,  19 B,  21 A,  21 B are respectively provided with male element means  3 ,  14 ,  23  or  25  or complementary female element means  4 ,  13 ,  22 ,  24  at one end. 
     Method of mounting the raceway  1  to the structural part  17  and method of mounting the electric cable means  10  into the raceway  1 . 
     The channel modules  2 ,  16 ,  18  or  20  with compatible channel sections  2 A,  2 B,  19 A,  19 B,  21 A,  21 B are suitable for combination with each other to raceways  1  of different designs. Free ends of the tying means  26  are passed from the clearance  12  through each of the pairwise slots  11  of each of the channel modules  2 ,  16 ,  18  or  20 , said free ends extending towards the open top of the channel sections  2 A,  2 B,  15 A,  15 B. 
     The at least two essentially longitudinal channel sections  2 A,  2 B,  15 A,  15 B with one passed through tying means  26  per pairwise slot  11  are mounted along or on top of the structural part  17  according to e.g. a routing diagram. The telescopic junctions  6  allow compensation of length variations by inserting the female element means  4 ,  14  more or less far into the cubic male element means  13  of the respective channel sections  2 A,  2 B,  15 A,  15 B. After adaption each of the longitudinal channel sections  2 A,  2 B,  15 A,  15 B are mounted by a fixation bolt through the hole  5  to or on top of the structural part  17  whereby the fixation with one bolt through one hole  5  per longitudinal channel section  2 A,  2 B,  15 A,  15 B allows further rotational adaption of the longitudinal channel sections  2 A,  2 B,  15 A,  15 B to the structural part  17 . Longitudinal channel sections  2 A,  2 B,  15 A,  15 B with respectively two holes  5  for a fixation bolt at each end of the raceway  1  are provided for curved channel sections  2 A,  2 B,  15 A,  15 B If a curved part is localized in the middle of the raceway  1  only one hole  5  is sufficient for attachment. 
     After mounting of the longitudinal channel sections  2 A,  2 B,  15 A,  15 B to or on top of the structural part  17  the electric cable means  10  are inserted along the raceway  1  through the open top into the longitudinal channel sections  2 A,  2 B,  15 A,  15 B between the free ends of the plastic clips  26 . The free ends of the plastic clips  26  are joined above the inserted electric cable means  10  and tightened to retain the electric cable means  10  inside the longitudinal channel sections  2 A,  2 B,  15 A,  15 B. 
     REFERENCE LIST 
     
         
           1  Raceway 
           2  Channel module 
           2 A channel section 
           2 B channel section 
           3  male element 
           4  female element 
           5  hole 
           6  Junction area/Telescopic area 
           7  base wall 
           8  side wall 
           9  side wall 
           10  cable means 
           11  Slots for cable tying means 
           12  clearance 
           13  u-shaped male element 
           14  u-shaped female element 
           15 A further channel section 
           15 B further channel section 
           16  preferred channel module 
           17  structural part 
           18  another channel module 
           19 A still further channel section 
           19 B still further channel module 
           20  still another channel module 
           21 A further channel section 
           21 B further channel section 
           22 ,  24  female element 
           23 ,  25  male element 
           26  tying means