Patent Abstract:
Method for producing a fastening system, in particular for components of photovoltaic systems, preferably on roof surfaces of buildings, includes providing a support surface ( 1 ) and applying at least one fastening component ( 7, 19 ) of loops and/or other interlocking elements on the support surface. After applying the fastening component ( 7, 19 ) in the mounted state of the support surface ( 1 ), at least one other corresponding fastening component ( 7, 19 ) provided with other interlocking elements can be detachably connected to the fastening components ( 7, 19 ) on the support surface.

Full Description:
FIELD OF INVENTION 
     The invention relates to a method for producing a fastening system, in particular for components of photovoltaic systems, preferably on roof surfaces of buildings. Furthermore, the invention relates to a fastening system produced according to such a method, and to a support element and a support surface which are intended for use in such a fastening system. 
     BACKGROUND OF INVENTION 
     Fastening systems in which touch-and-close connections of complementary interlocking elements which can be engaged to one another are used in order to fasten components, such as solar power components, to support surfaces, especially roof surfaces, are prior art; compare, for example, DE 103 29 184 A1 or WO 2011/076307 A1. In the practical use of such systems, the attachment of the interlocking elements to an attachment surface of the supporting structure, that is to say, a building surface or roof surface, presents no problems only in those cases in which the surface composition of the attachment surface is suitable enough for producing the connection to the interlocking element. In roof surfaces, this is often not the case, for example, when there are concrete surfaces, or rough wood surfaces, or insulating layers. A reliable connection can be produced in such cases at best by using special touch-and-close fastener elements in which there are interlocking elements on a support which is compatible with the respective surface composition of the attachment surface. In ordinary touch-and-close fastener elements with fleece-like, nonwoven-like, or fabric-like backing, this is not the case. The necessity of special selection of the touch-and-close fastener elements to be used and the special measures which must be taken for a reliable attachment of the touch-and-close fastener elements to the attachment surface lead to complication and increased costs in the prior art. 
     SUMMARY OF THE INVENTION 
     With respect to these problems, the object of the invention is to devise a method for producing a fastening system which enables a simple, reliable, and economical fastening of the corresponding components. 
     This object is basically achieved according to the invention by a method where a support surface is be provided and at least one fastening component of loop and/or other interlocking elements is applied on the support surface after fastening the respective fastening component in the mounted state of the support surface, at least one other corresponding fastening component provided with other interlocking elements is detachably connected to the assignable fastening components. Regardless of the respective type of the attachment surface or roof surface, on the top of the support surface for attaching the fastening component a suitable joining surface is thus available so that touch-and-close fastener elements of any desired structure can be easily and reliably attached as fastening components. 
     Especially advantageously, the support surface can be produced from a bitumen mass or from plastic, on at least one surface region of the support surface at least one fastening component being attached, preferably by coating or laminating it on. 
     When using a plastic support surface, it is preferable to proceed such that the support surface is provided in the form of a thin plastic sheet, preferably of an elastomer material, for example, from a synthetic rubber material or a thermoplastic olefin. 
     In especially advantageous exemplary embodiments, it is possible to proceed such that to form the support surface, a backing web is provided, for example, in the form of a thin tape of a plastic, such as PET or the like, with the backing web being applied in one transport direction at an application station on which a bitumen mass is applied, preferably by doctoring, and being moved past a following attachment station at which the assigned fastening component is attached in the chosen surface area. 
     Bitumen layers as are installed as insulating layers on building surfaces or roof surfaces are often provided with an intercalated or attached granulate. When using a bitumen layer to form the support surface according to the method according to the invention, it is possible to proceed in this respect such that the backing web provided with the bitumen mass and with the fastening component is moved past a sprinkling station on which a granulate is applied on the surface regions which are free of the fastening component. 
     The subject matter of the invention is also a fastening system produced using the method according to the invention and characterized in that the respective fastening component can be joined to the support surface and is located on a support element designed as a holder for structural elements, especially components of photovoltaic systems. 
     Especially advantageously, the respective support element can be made in the form of a mounting rail which on the side facing the support surface is provided with the pertinent fastening component in the form of a touch-and-close fastener element. In this connection, the touch-and-close fastener element which is located on the support surface can be provided in the form of at least one tape which extends on the area of the support surface and along the respectively assigned mounting rail. 
     Especially advantageously, the respective mounting rail can be made in the form of a profile of plastic, for example, an acrylic-nitrile-styrene-acrylate. This type of profile can be extruded in an extrusion process and can be subdivided into longitudinal sections intended for the respective application. 
     Preferably, the respective profile is made as a hollow profile which has receiving spaces for holding lines or other components of photovoltaic systems which are inserted into them. 
     Especially advantageously, the respective hollow profile can have wall parts for forming support and/or fastening regions for solar panels. 
     The mounting rail, especially for the attachment of flexible solar panels, can be made in the form of a profile strip which has at least one longitudinal slot for accommodating the fastening edge of a pertinent solar panel, which edge is inserted into it. 
     The subject matter of the invention is also a support element for use in a fastening system according to the invention, with the support element being characterized in that it is made in the form of a mounting rail which has been extruded from a plastic material. 
     The subject matter of the invention is furthermore a support surface designed for use in the fastening system according to the invention and characterized in that it is formed from a bitumen mass or in the form of a thin plastic sheet, preferably of an elastomer material. On the top of the support surface there is at least one touch-and-close fastener element in a location which is in a positional relationship to an assigned support element which is to be fastened. 
     Other objects, advantages and salient features of the present invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses preferred embodiments of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a partial detached perspective oblique view of one support surface in the form of a bitumen mass with a touch-and-close fastener element located on it as a component of one exemplary embodiment of the fastening system according to the invention; 
         FIG. 2  is shows a side view of in the support surface of  FIG. 1 ; 
         FIG. 3  is a perspective view of one support surface in the form of an elastomer plastic sheet with a touch-and-close fastener element located on it as a component of another exemplary embodiment of the fastening system according to the invention; 
         FIG. 4  shows a section according to section line IV-IV from  FIG. 3 ; 
         FIG. 5  is a perspective view of a longitudinal section of one exemplary embodiment of a support element as a component of one exemplary embodiment of the fastening system according to the invention; 
         FIG. 6  is a side elevational view in a cross section of the support element of  FIG. 5  with the assigned touch-and-close fastener element located on it; 
         FIG. 7  is a perspective view of a modified exemplary embodiment of a support element according to the invention; 
         FIG. 8  is a side elevational view in section of the support element of  FIG. 7 ; 
         FIG. 9  is a perspective view of a support element similar to  FIG. 7  with lines inserted into it according to an exemplary embodiment of the invention; 
         FIG. 10  is a side elevational view in cross section of in the support element  FIG. 9 ; 
         FIG. 11  is a perspective view of one modified exemplary embodiment of the support element in the form of a profile strip with solar panels fastened on it according to the invention; 
         FIG. 12  is an enlarged side elevational view of the profile strip of  FIG. 11 , and 
         FIG. 13  is a highly schematically and simplified side elevational view of a device for producing a support surface for use in the fastening system according to an exemplary embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The exemplary embodiment of a support surface  1  shown in  FIGS. 1 and 2  is formed by a bitumen web  2  on whose surface  5  a touch-and-close fastener element  7  is fastened. The latter extends in the form of a strip or tape  9  over the top  5  of the web  2  of bitumen mass, with the surface region of the bitumen web  2 , which is free of the touch-and-close fastener element  7 , being provided with attached granulate  4 . The bitumen web  2 , which is made to have a much larger area than the touch-and-close fastener element  7 , with its underside  11  makes available a correspondingly large-area connecting region for the connection to a corresponding support surface (which is not shown), for example, a roof surface or components thereof. 
     The tape  9  of the touch-and-close fastener element  7  extends in a positional orientation which is aligned to an assigned support element which is to be anchored on the support surface  1 . The respective support element  13  is a mounting rail shown in  FIGS. 5 to 10  as exemplary embodiments, or is a respective profile strip  16  as is shown in  FIGS. 11 and 12 . In  FIG. 1 , on the support surface  1 , there is only one tape  9  of the touch-and-close fastener element  7  for a single support element on the bitumen web  2 . In systems with several support elements on a common support surface  1 , there can be several tapes  9  with touch-and-close fastener elements  7 , or there can be several support surfaces  1  with one tape  9  each, as is shown in  FIG. 1 . 
       FIGS. 3 and 4  show a second exemplary embodiment of the support surface  1  in the form of a sheet  3  of an elastomer plastic material, for example, a synthetic rubber or a thermoplastic olefin. As in the exemplary embodiment from  FIGS. 1 and 2 , a touch-and-close fastener element  7  in the form of a tape  9  on the top  5  of the support surface  1  is attached by coating or laminating it on. In the example of  FIGS. 1 and 2 , touch-and-close fastener elements which in the known construction can have interlocking elements  21  in the form of mushrooms, loops, or hooks. In the exemplary embodiments provided here, there are interlocking elements  21  in the form of loops in the touch-and-close fastener elements  7  provided on the support surface  1 . These touch-and-close fastener elements  7  form a kind of fleece with a base formed by a fabric. With respect to the permeability of the base, in lamination or cementing onto the top  5  of the support surface, for example, of the bitumen web  2 , the procedure is such that there is no material passage through the base, for example, by plasticized bitumen, to the region of the interlocking elements  21  in the form of loops. 
       FIGS. 5 and 6  show a first exemplary embodiment of a mounting rail  13  in the form of a hollow profile  15 , which is extruded from a plastic material in an extrusion process. It can be a thermoplastic polymer, for example, acrylic-nitrile-butadiene-styrene (ABS) or preferably an acrylic-nitrile-styrene acrylate. In order to protect parts of the hollow profile  15  which are exposed during use, there can be a sunproof and/or weather-resistant coating at least on outside surfaces of the hollow profile  15 . For example, materials such as polymethylmethacrylate (PMMA) or polytetrafluorethylene (PTFE) are suitable for this coating. This coating can be efficiently formed by a coextrusion method in the production of the hollow profile  15 . 
     The hollow profiles  15  on the underside have a flat fastening surface  17  for attaching a touch-and-close fastener element  19  which corresponds to the touch-and-close fastener element  7  of the support surface  1 . Like this touch-and-close fastener element  7 , the touch-and-close fastener element  19  also has interlocking elements  21  on a backing  23  which on the side of the support surface  1  cements or bonds to the top  5  of the support surface  1  or is laminated onto it and on the side of the hollow profile  15  is cemented or bonded to the fastening surface  17 . The touch-and-close fastener elements  7  and  19  can be made in a conventional manner, i.e., they can have conventional interlocking elements  21  in the form of mushrooms, loops, or hooks. In the present exemplary embodiment, the interlocking elements  21  are made on the hollow profile  15  in the form of mushrooms. 
     Instead of the example which is shown in  FIG. 6  and in which the touch-and-close fastener element  19  with its backing  23  is fastened on the fastening surface  17 , alternatively, the interlocking elements  21 , especially in a version as mushrooms, can also be formed on the fastening surface  17  of the material of the hollow profile  15  itself. On the two end edges of the fastening surface  17  as an edge enclosure, a slightly projecting edge rib  25  is formed as a lateral guide for the respective tape of the touch-and-close fastener element  19  which is located on the fastening surface  17 . The hollow profile  15  has, proceeding from the lower fastening surface  17 , flat side walls  27  which run slightly converging upward and on the upper end undergo transition into profile webs  29  which extend opposite one another in the plane parallel to the fastening surface  17 , but end at a distance from one another. Within the profile shape, inner walls  31  are formed which extend proceeding from the central region of the fastening surface  17  diverging to one another upward toward the profile webs  29  and with the side walls  27  border one receiving space  33  at a time. An intermediate wall  35  which runs in a parallel plane underneath the profile webs  29  between the inside walls  31  borders another triangular space  37  and an overlying space  39  which is open between the profile legs. The flat outside surfaces of the profile legs  29  and the space  39  which forms a type of dovetail guide form a support and attachment region for a pertinent component which is to be fastened (which is not shown), and it can be, for example, a component of a solar power system, for example, a solar panel. 
       FIGS. 5 and 6  show one exemplary embodiment of the hollow profile in which an overhanging rail  41  is molded on one side wall  27  and forms an open receiving space  43  which can be used, for example, as a cable duct for lines  45  ( FIGS. 9 and 10 ). 
       FIGS. 7 and 8  show a modified exemplary embodiment of the hollow profile  15  which differs from the example from  FIGS. 5 and 6  simply in that the inside walls  31  run at a distance to one another, parallel to one another, and perpendicular to the fastening surface  17 , so that space  43  located underneath the intermediate wall  35  has a rectangular cross section. 
       FIGS. 9 and 10  show one modified exemplary embodiment of the hollow profile  15  from  FIGS. 7 and 8  without the laterally attached rail, with one line  45  at a time being inserted into the receiving spaces  33  formed between the side wall  27  and inside wall  31 . The hollow profile from  FIGS. 9 and 10  and likewise the hollow profile  15  from  FIGS. 7 and 8  also differ from the hollow profile  15  according to  FIGS. 5 and 6  in that the space  39  open at the top has the cross-sectional shape of a rectangular dovetail guide with wall parts which run perpendicular to one another by the end sections of  47  of the inside walls  31 , which sections run parallel to one another. 
       FIGS. 11 and 12  show one modified embodiment for the mounting rail  13  in the form of an elongated, relatively flat profile strip  16 . In the same manner as the hollow profile  15 , the profile strip is extruded from a corresponding plastic material in an extrusion process. The strip  16 , like the hollow profile  15 , on the underside has a flat fastening surface  17  for a touch-and-close fastener element  19 . In the central region of the fastening surface  17 , from its top  18  a clamping part  20  extends in the longitudinal direction of the strip  16 , with the clamping part  20  having a cross-sectional shape in the form of a flat T with lateral clamping wings  22  which border a longitudinal slot  24  between themselves and the top  18  of the fastening surface  17 . As  FIG. 11  illustrates, a flexible solar panel  26  can be inserted into the respective longitudinal slot  24 , with the wings  22  fastening the fastening edge  28  of the solar panel  26  by clamping; see  FIG. 11 . The solar panel  26  can be an arrangement of solar modules which is located on a backing film which consists of a preferably napped plastic sheet with a rectangular outline. In commercial solar panels of this type, the plastic film supporting the modules has dimensions of about 55×40 cm and consists of a weather-resistant plastic material, such as PMMA or PTFE, with the edge zones  28  which are free of modules being usable as holding regions for fastening of the panels  26 . 
       FIG. 13  shows highly simplified the production of a support surface  1  on a bitumen web  2  which is provided with the assigned touch-and-close fastener element  7  and with attached granulate  4 . In the device, a backing web  30  of plastic material such as PTFE is moved in one transport direction marked with arrow  32  past an application station  34  on which a bitumen layer  40  is formed on the transport web  30  from a bitumen mass, a so-called “molasses”  36 , by means of a doctor blade  38 . The transport web with the formed bitumen layer  40  is moved past an attachment station  42  at which the pertinent touch-and-close fastener element  7  is attached on the top of the bitumen layer  40 ; as described above, this takes place by cementing it or laminating it on. Then the transport web  30  with the bitumen layer  40  and with the attached tape of the touch-and-close fastener element  7  runs through a drier  44  to a following sprinkling station  46  at which granulate for attachment is scattered in the surface regions which are free of the touch-and-close fastener element  7 . The support surface  1  which has been produced in this way can at this point be wound up together with the backing web  30  and transported as a coil to the site of use (such as a construction site) where, after unwinding, the backing web  30  can be removed from the underside of the support surface  1  before its actual use. 
     One very great advantage of this invention is that in the indicated production method, the loop tape to be applied with its base fabric structure need not be immersed into the bitumen web, but is applied rather almost flush to the top of the bitumen web. If bitumen components penetrate into the base surface of the backing fabric of the loop tape, they allow a strong connection of the loop tape to the base backing material in the form of the bitumen layer without the interlocking capacity of the loop material being adversely affected. This also applies to the case in which the loop surface is replaced by an interlocking layer also in a mushroom form. 
     While various embodiments have been chosen to illustrate the invention, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention as defined in the appended claims

Technology Classification (CPC): 8