Abstract:
An installation system for mounting stationary objects, such as towel holders, shelves, lights, or similar furnishing items, on an installation surface, such as a wall or a ceiling, in particular in rooms equipped with tiles, marble slabs, or similar wall coverings, includes one or more fastening elements, a lighting device, and/or an adhering and connecting agent, wherein the adhering and connecting agent is a light-curing adhesive. The one or more fastening elements can be fastened by introducing an adhering and connecting agent into an adhesive space formed by the installation surface and components of the fastening element. The fastening element has at least one at least partially transparent component for irradiating the adhering and connecting agent.

Description:
This patent application is a U.S. national stage application of PCT international application PCT/EP2010/003824 filed on 25 Jun. 2010 and claims priority of German patent document 10 2009 031 188.2 filed on 29 Jun. 2009. 
     FIELD OF THE INVENTION 
     The invention concerns an installation system for mounting stationary objects, such as towel holders, shelves, lights or similar furnishing items, on an installation surface, such as a wall or a ceiling, in particular in rooms fitted out with tiles, marble slabs or similar wall coverings, comprising one or more fastening elements, a lighting device and/or an adhering and connecting agent. 
     BACKGROUND OF THE INVENTION 
     Many installation systems for attaching fastening elements of a wide variety of embodiments and materials on walls in bathrooms and kitchens are known from the prior art, there being the problem, particularly for such walls and the wall coverings thereof in the form of tiles or marble slabs, that, for example in the case of a tiled wall, the fastening elements are fastened in the traditional way in the joints between the tiles, in particular through holes drilled in the region where the joints intersect, often with the result that the tiles adjacent the respective joint become damaged or chipped or develop cracks in their glazing, which, apart from visually perceptible deteriorations in quality, also cause subsequent damage involving laborious reworking or, if the fastening point is relocated elsewhere or inappropriate installations are carried out in tucked-away regions, such as corners and edges, not only is it difficult to attach the fastening elements but there are also unsightly dowel holes that have to be filled in again. For this reason, the fastening elements are often fastened by means of a wide variety of adhesive connections, which however must meet the requirements that the fastening elements have to withstand relatively great forces in order to accept elements for the mounting of stationary objects, such as towel holders, shelves, etc., while taking into account the structural conditions, such as the strength of the adhesive, the strength of the fastening element, the surface-area loading of the installation system and the structure of the wall systems. 
     Fastening elements for adhesive bonding on smooth surfaces are known from the published patent applications WO 03/036106 A1, DE 101 52 053 A1, WO 01/81774 A1 and DE 44 16 884. These fastening elements have a filling opening, by way of which an adhering and connecting agent can be introduced into a cavity between the fastening element and a ceiling or wall. To allow excess adhering and connecting agent and the air that has been displaced by the adhering and connecting agent entering the cavity to escape, the fastening elements may be provided with rising openings or open-pored components. Adhesive films make fixing of the fastening elements possible during the drying phase of the adhering and connecting agent introduced. 
     One problem which the prior art has not so far been able to solve results from the period of time that elapses before an adhesive connection can sufficiently withstand loads. This causes long waiting times, which delay work. In the case of applications in the domestic sector, it is even customary for an installer to have to travel to the site more than once—for adhesively attaching a fastening element and for subsequently mounting an object on the fastening element. 
     PROBLEM 
     Proceeding from the prior art described, the invention addresses the problem of providing an installation system for attaching fastening elements which are designed for mounting stationary objects, such as towel holders, shelves, lights or similar furnishing items, on an installation surface, such as a wall or a ceiling, in particular in rooms fitted out with tiles, marble slabs or similar wall coverings, the waiting time between the adhesive bonding of the fastening element to the installation surface and the attachment of the stationary objects being eliminated or greatly reduced. 
     SUMMARY OF INVENTION 
     This problem is solved by the inventions with the features of the independent claims. Advantageous developments of the inventions are characterized in the dependent claims. The wording of all the claims is hereby made the content of this description by reference. The invention also comprises all appropriate combinations, and in particular all mentioned combinations, of independent and/or dependent claims. 
     For mounting stationary objects, such as towel holders, shelves, lights or similar furnishing items, on an installation surface, such as a wall or a ceiling, in particular in rooms fitted out with tiles, marble slabs or similar wall coverings, such as wall coverings consisting of wood, glass, stone, ceramic or plastic, the invention proposes an installation system. This installation system comprises one or more fastening elements, at least one lighting device and/or an adhering and connecting agent. The adhering and connecting agent is a light-curing adhesive. 
     The fastening element is designed such that it can be fastened on the installation surface by introducing the adhering and connecting agent into an adhesive space. Furthermore, the fastening element is designed such that—once the adhering and connecting agent has cured—the stationary objects can be attached to the fastening element. 
     The adhesive space is formed by the installation surface together with one or more components of the fastening element, i.e. each delimiting surface of the adhesive space is identical to part of the installation surface or part of the surface of one of the components of the fastening element that form the adhesive space. If a sufficient quantity of the adhering and connecting agent is introduced into the adhesive space, the adhering and connecting agent introduced comes into contact with the installation surface and the components of the fastening element that form the adhesive space. After the curing of the adhering and connecting agent, there is a material-bonding connection between the installation surface and the fastening element. 
     The adhering and connecting agent may be introduced in sufficient quantity into the adhesive space in various ways. For instance, it is possible before the placement of the fastening element onto the installation surface to apply the adhering and connecting agent to the installation surface or to the fastening element in such a way that the adhering and connecting agent is located in the adhesive space when the fastening element is placed onto the installation surface. Preferably, the fastening element has a recess which, together with the installation surface, forms the adhesive space. Before placement onto the installation surface, this recess may be filled with the adhering and connecting agent. Preferably, the volume of the adhering and connecting agent that is introduced is equal to or exceeds the volume defined by the recess. 
     A preferred embodiment of the fastening element has at least one filling opening, through which the adhering and connecting agent can be introduced in sufficient quantity into the adhesive space when the fastening element has been placed onto the installation surface. To allow excess adhering and connecting agent and the air that has been displaced by the adhering and connecting agent entering to escape, the fastening element may also be provided with one or more rising openings or consist in parts of an open-pored material. 
     After the placement of the fastening element onto the installation surface, the introduction of the adhering and connecting agent into the adhesive space and the curing of the adhering and connecting agent, the stationary objects can be mounted on the fastening element. To minimize the waiting time before the mounting of the stationary objects, in a novel embodiment a light-curing adhesive is used as the adhering and connecting agent. 
     Light-curing or photoinitiated-curing adhesives are usually single-component adhesives which cure under the effect of electromagnetic activating radiation as an initiator of a chemical reaction. The absorption spectrum, i.e. the spectrum of wavelengths that lead to the curing of the adhesive, usually lies here in a range between 320 nm and 550 nm. As a difference from rapidly curing adhesives, such as cyanoacrylate adhesives (instant adhesives), the curing in the case of light-curing adhesives takes place in a controlled manner. In particular, the installer can individually determine the moment from which the curing of the adhesive takes place—initiated by the irradiation. It is thus ensured that sufficient time is available to fill the adhesive into the adhesive space and possibly adjust the fastening element on the installation surface. 
     According to the invention, at least one of the components of the fastening element that form the adhesive space is at least partially transparent. In particular, this at least one at least partially transparent component of the fastening element is transparent in such a way that irradiation of the adhering and connecting agent with an activating radiation through this at least one transparent component of the fastening element leads to the curing of the adhering and connecting agent. This means that the transmission range of the at least one at least partially transparent component at least partially overlaps with the absorption spectrum of the adhesive that is used as the adhering and connecting agent. There are therefore ranges of wavelengths that are contained both in the transmission range of the at least one at least transparent component and in the absorption spectrum of the adhesive. The components of the fastening element that are not among the at least partially transparent components of the fastening element may be opaque. This makes it possible for the fastening element to be designed in such a way that it can sufficiently withstand loads. 
     It is possible to irradiate the adhering and connecting agent with activating radiation through the at least one at least partially transparent component of the fastening element after the placement of the fastening element onto the installation surface and introduction of the adhering and connecting agent into the adhesive space. This leads to curing of the adhering and connecting agent. Even after a very short waiting time, the adhesive connection produced in this way can sufficiently withstand loads, so that the stationary objects can be mounted on the fastening element. Depending on the light source that is used for the irradiation and the light-curing adhesive that is used as the adhering and connecting agent, the waiting time lies between 1 sec and several minutes, but at most 10 min, preferably less than 5 min. 
     According to the invention, one of the at least partially transparent components of the fastening element is formed as a first ring, the adhesive space being located inside this first ring. In this case, the adhesive space is formed by the first ring, the installation surface and a main body belonging to the fastening element. Preferably, the main body is opaque. The first ring may be designed as an O-ring with a circular or oval cross-sectional area. To avoid undesired refraction of the activating radiation, however, the first ring preferably has a rectangular cross-sectional area. The base area of the first ring may be formed in any way desired, for instance as a rectangle, but preferably as a circle. The first ring may be adhesively bonded to the main body. Alternatively, the main body has a peripheral recess which positively or non-positively connects the first ring to the main body. Preferably, the first ring is arranged inside the fastening element such that, when the fastening element is placed onto the installation surface, it comes into contact with said element. To pre-fix the fastening element on the installation surface, an end face, i.e. an area remote from the base area and proximate to the installation surface, of the first ring may have an adhesive layer, for example in the form of an adhesive film. 
     Preferably, a second of the at least partially transparent components of the fastening element that form the adhesive space is formed as a second ring, the adhesive space being located outside this second ring. In this case, the adhesive space is formed by the second ring, the installation surface and the main body. Like the first ring, the second ring may be designed as an O-ring with a circular or oval cross-sectional area. To avoid undesired refraction of the activating radiation, however, the second ring preferably has a rectangular cross-sectional area. The base area of the second ring may be formed in any way desired, for instance as a rectangle, but preferably as a circle. The second ring may be adhesively bonded to the main body. Alternatively, the main body has a recess which positively or non-positively connects the second ring to the main body. Preferably, the second ring is arranged inside the fastening element such that, when the fastening element is placed onto the installation surface, it comes into contact with said element. To pre-fix the fastening element on the installation surface, an end face, i.e. an area remote from the base area and proximate to the installation surface, of the second ring may have an adhesive layer, for example in the form of an adhesive film. 
     The fastening element may comprise the first ring without the second ring or the second ring without the first ring. Preferably, both the first ring and the second ring belong to the fastening element. In this case, the second ring is arranged inside the first ring, so that the adhesive space is located between the first ring and the second ring, the adhesive space being formed by the first ring, the second ring, the main body and the installation surface. This makes it possible for the adhering and adhesive agent to be irradiated both through the first ring and through the second ring. The width of the adhesive space or the distance between the first ring and the second ring can consequently be increased. 
     To be able to irradiate the adhering and connecting agent through the second ring when the fastening element has been placed on the installation surface, the fastening element preferably has an insertion opening. The main body, the insertion opening, the second ring and the installation surface enclose a cavity into which a light source which irradiates at least the second ring can be inserted through the insertion opening. This light source preferably generates activating radiation, which irradiates and cures the adhering and connecting agent through the second ring. 
     It is advantageous that the insertion opening can be closed with a receiving element. Alternatively, this receiving element may be attached at other locations of the main body or of the fastening element. The receiving element serves the purpose of fixing on the fastening element the stationary objects to be mounted. For receiving and fixing the stationary objects, the receiving element may have an internal thread, an external thread or other fixing mechanisms known to a person skilled in the art. Furthermore, it may form a material unit with the main body or with the fastening element or be connected to the main body or the fastening element, for example by pressing in, riveting on, adhering or screwing in. 
     In a further embodiment, at least one of the delimiting surfaces of the adhesive space that are identical to part of the surface of one of the at least partially transparent components of the fastening element runs substantially parallel to the installation surface, i.e. the at least one of the limiting surfaces of the adhesive space runs parallel to the installation surface if production tolerances and surface irregularities are ignored. For example, windows of a transparent material, which is transparent in particular for radiation of the wavelength that leads to the curing of the adhering and connecting agent, may be let into the optically dense main body, i.e. consisting of opaque material. It is also possible to produce the main body completely from a transparent material. 
     It is also advantageous that at least one filling opening and/or at least one rising opening can be closed with in each case one of the at least partially transparent components of the fastening element once the adhering and connecting agent has been introduced into the adhesive space through the at least one filling opening. This makes irradiation of the adhering and connecting agent possible through the at least one filling opening closed by one of the at least partially transparent components of the fastening element and/or through at least one rising opening closed with one of the at least partially transparent components of the fastening element, so that the adhering and connecting agent cures. In this case, the light source which generates the activating radiation does not come into direct contact with the adhering and connecting agent. In particular, damage to the light source caused by contact with the not yet cured adhering and connecting agent is avoided. 
     In a preferred embodiment, at least one of the at least partially transparent components of the fastening element reflects, refracts and/or diffuses light. Reflection, refraction or diffusion of the activating radiation through the at least one of the at least partially transparent components of the fastening element is especially advantageous. This makes it possible to introduce the activating radiation even into shadow zones possibly present within the adhesive space. Moreover, in this way large regions of the adhesive space can be irradiated by means of comparatively small at least partially transparent components of the fastening element. This improves the possibilities for structurally designing the fastening element. In particular, large parts of the fastening element can be designed as opaque components. 
     A first lighting device, designed for curing a light-curing adhesive, has at least one light source, which can be inserted through the insertion opening of the fastening element into the cavity enclosed by the main body, the insertion opening, the second ring and the installation surface. If this at least one light source is inserted into this very cavity, the second ring is located in the path of rays of the at least one light source. This means that the second ring is irradiated by the at least one light source directly and, in particular, is not impinged exclusively by indirect and/or diffuse light. Preferably, the inner surface of the second ring is in this case irradiated completely. The light source refers to the location of the lighting device from which the light is emitted into the surroundings. The at least one light source preferably generates activating radiation in a wavelength and at an intensity that lead to the curing of the adhesive used as the adhering and connecting agent. In particular, the emission spectrum of the at least one light source, i.e. the spectrum of the wavelengths of the activating radiation generated by this light source, overlaps with the absorption spectrum of the adhesive used as the adhering and connecting agent. Preferably, the at least one light source also generates activating radiation in a wavelength and at an intensity that lead to the curing of the adhesive used as the adhering and connecting agent when it irradiates the adhesive through the second ring. In particular, the emission spectrum of the at least one light source, the absorption spectrum of the adhesive used as the adhering and connecting agent and the transmission spectrum of the second ring overlap in a common range. In the inserted state of the lighting device, the path of rays of the at least one light source preferably runs parallel to the installation surface. To irradiate the inner surface of the second ring completely, the path of rays of the at least one light source also preferably has a disk-shaped geometry. Alternatively, disk segments or cylinders are conceivable as the geometry of the path of rays of the at least one light source. Preferably, a number of paths of rays that respectively have the form of a disk segment thereby combine to form a common path of rays in the form of a disk. If the first lighting device only partially irradiates the inner surface of the second ring, complete curing of the adhering and connecting agent can be achieved by turning the lighting device about its own axis. 
     A second lighting device, designed for curing a light-curing adhesive, has at least two light sources and can be placed onto the installation surface, so that the fastening element, comprising the first ring, is located between the at least two light sources. When the lighting device has been placed onto the installation surface and the fastening element is located between the at least two light sources, the first ring is located in the paths of rays of the at least two light sources. These at least two light sources preferably generate activating radiation in a wavelength and at an intensity that lead to the curing of the adhesive used as the adhering and connecting agent. In particular, the emission spectrum of the at least two light sources, i.e. the spectrum of the wavelengths of the activating radiation generated by these light sources, overlaps with the absorption spectrum of the adhesive used as the adhering and connecting agent. Preferably, the at least two light sources also generate activating radiation in a wavelength and at an intensity that lead to the curing of the adhesive used as the adhering and connecting agent when it irradiates the adhesive through the second ring. In particular, the emission spectrum of the at least two light sources, the absorption spectrum of the adhesive used as the adhering and connecting agent and the transmission spectrum of the second ring overlap in a common range. In the placed state of the lighting device, the paths of rays of the at least two light sources preferably run parallel to the installation surface. If the second lighting device only partially irradiates the outer surface of the first ring, complete curing of the adhering and connecting agent can be achieved by turning the lighting device about its own axis. 
     A third lighting device, designed for curing a light-curing adhesive, has an annular light source and can be placed onto the installation surface, so that the fastening element, comprising the first ring, is located inside the annular light source. When the lighting device has been placed onto the installation surface and the fastening element is located inside the annular light source, the first ring is located in the path of rays of the annular light source. In particular, the outer surface of the first ring is completely irradiated by this annular light source. The annular light source preferably generates activating radiation in a wavelength and at an intensity that lead to the curing of the adhesive used as the adhering and connecting agent. In particular, the emission spectrum of the annular light source, i.e. the spectrum of the wavelengths of the activating radiation generated by this light source, overlaps with the absorption spectrum of the adhesive used as the adhering and connecting agent. Preferably, the annular light source also generates activating radiation in a wavelength and at an intensity that lead to the curing of the adhesive used as the adhering and connecting agent when it irradiates the adhesive through the second ring. In particular, the emission spectrum of the annular light source, the absorption spectrum of the adhesive used as the adhering and connecting agent and the transmission spectrum of the second ring overlap in a common range. In the placed state of the lighting device, the path of rays of the annular light source preferably runs parallel to the installation surface. 
     Instead of the second or third lighting device, a commercially available curing lamp may be used as the light source for irradiating the adhering and connecting agent with activating radiation that leads to the curing of the adhering and connecting agent through the first ring. To irradiate the adhering and connecting agent completely, the installer must make such a curing lamp move along a concentric path around the first ring in such a way that the cone of light of the curing lamp is always oriented in the direction of the first ring, i.e. the first ring is always located in the cone of light of the curing lamp. However, this entails the risk that the adhering and connecting agent is not sufficiently irradiated as a result of possible incorrect operation. 
     According to the invention, a fourth lighting device for curing a light-curing adhesive comprises a lighting device described above as the first lighting device, with at least one light source, which can be inserted through the insertion opening of the fastening element, and one of the lighting devices described above as the second lighting device, with at least two light sources, or as the third lighting device, with an annular light source, for placing onto the installation surface. In this case, the fourth lighting device, the lighting device described as the first lighting device and the lighting device described as the second or third lighting device form a structural unit. With the fourth lighting device, the adhering and connecting agent may be irradiated with activating radiation simultaneously through the first ring and through the second ring. This simplifies the fastening of the fastening element on the installation surface and leads to more uniform curing of the adhering and connecting agent. If the fourth lighting device only partially irradiates the outer surface of the first ring or the inner surface of the second ring, complete curing of the adhering and connecting agent can be achieved by turning the lighting device about its own axis. 
     An installation system according to the invention for mounting stationary objects, such as towel holders, shelves, lights or similar furnishing items, on an installation surface, such as a wall or a ceiling, in particular in rooms fitted out with tiles, marble slabs or similar wall coverings, comprises one or more of the fastening elements described above and/or at least one of the lighting devices described above. In addition, the installation system may comprise an adhering and connecting agent, which is a light-curing adhesive. 
     A method according to the invention using one or more of the fastening elements described above, at least one of the lighting devices described above and an adhering and connecting agent, which is a light-curing adhesive, for mounting stationary objects, such as towel holders, shelves, lights or similar furnishing items, on an installation surface, such as a wall or a ceiling, in particular in rooms fitted out with tiles, marble slabs or similar wall coverings, comprises the following steps: placing the fastening element onto the installation surface, introducing the adhering and connecting agent and curing the adhering and connecting agent by irradiation with at least one of the lighting devices. 
     Also claimed is the use of one or more of the fastening elements described above, at least one of the lighting devices described above and an adhering and connecting agent, which is a light-curing adhesive, for mounting stationary objects, such as towel holders, shelves, lights or similar furnishing items, on an installation surface, such as a wall or a ceiling, in particular in rooms fitted out with tiles, marble slabs or similar wall coverings. In addition, any desired further uses in which an object is to be fixed on a surface are conceivable. In particular, the fastening elements, the lighting devices, the adhering and connecting agent and/or the installation system may be used for fastening other devices on surfaces. 
     Further details and features emerge from the following description of preferred exemplary embodiments in conjunction with the dependent claims. The respective features may be realized on their own or together in combination with one another. The possibilities of solving the problem are not restricted to the exemplary embodiments. Thus, for example, statements of ranges always include all—unmentioned—intermediate values and all conceivable subintervals. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The exemplary embodiments are schematically represented in the figures. The same reference numerals in the individual figures thereby designate elements that are the same or functionally the same or correspond to one another with regard to their functions. Specifically: 
         FIG. 1  shows a fastening element with a lighting device for placing; 
         FIG. 2  shows a fastening element with a lighting device for inserting; 
         FIG. 3  shows a fastening element with a lighting device for moving around; 
         FIG. 4  shows a fastening element with a lighting device with an annular light source for placing; 
         FIG. 5  shows a fastening element with a surrounding transparent element; 
         FIG. 6  shows a fastening element with a transparent element integrated in the main body; 
         FIG. 7  shows a fastening element with windows and 
         FIG. 8  shows a fastening element with a transparent main body. 
     
    
    
     DETAILED DESCRIPTION OF INVENTION 
       FIGS. 1 to 8  show embodiments of the fastening element  12  that are given by way of example. This element consists of a main body  42 , a first ring  16  and a second ring  18  and has an adhesive space  14 . Serving for fastening the stationary objects to be mounted is a receiving element  34 . This element may, for example—as represented in FIG.  2 —be screwed to the main body or be detachably connected to the main body  42  by means of a riveted connection represented in  FIG. 8 . The fastening element  12  may also have an insertion opening  20 , a filling opening  36  and/or a rising opening  38 . 
     Both the first ring  16  and the second ring  18  have a rectangular cross-sectional area and are adhesively bonded to the main body. Both rings  16 ,  18  may consist of a transparent material, which is transparent particularly to radiation of the wavelength that leads to the curing of the adhering and connecting agent. Suitable materials for the rings  16 ,  18  are, for instance, glass, Plexiglas or transparent plastic, preferably transparent double-sided adhesive film. If, as represented in  FIG. 1 ,  FIGS. 3 to 5  and  FIGS. 7 and 8 , the insertion opening  20  is absent, the second ring  18  may also consist of an optically dense material. 
     Similarly, in the case of the embodiments shown in  FIGS. 1 to 7 , the main body  42  consists of an optically dense, i.e. opaque, material, for example metal, plastic and/or ceramic. In this way, the main body can withstand the forces of the mounted stationary objects without becoming damaged and pass them on to the installation surface by way of the adhesive connection. 
       FIG. 7  shows an embodiment of the fastening element  12  in which transparent windows  40 , which form a delimiting surface of the adhesive space  14  running parallel to the installation surface  10 , have been let into the main body  42 . This makes it possible for the adhering and connecting agent to be irradiated through the windows  40 , the path of rays of the lighting device that is used running perpendicularly to the installation surface  10 . In this case, both the first ring  16  and the second ring  18  may consist of an optically dense material. Furthermore, it is possible to omit the second ring  18 , so that the entire region inside the first ring  16  forms the adhesive space  14 . 
     The main body  42  of the embodiment represented in  FIG. 8  consists of a transparent material. In particular, the main body forms a delimiting surface of the adhesive space  14  running parallel to the installation surface  10 . This makes it possible for the adhering and connecting agent to be irradiated completely through the main body  42 . To prevent the main body  42  from being damaged by the stationary objects to be mounted, in the mounted state the stationary objects preferably rest on the main body  42 , so that torsional moments occurring are not introduced into the receiving element  34  but are supported by the main body  42 . For this purpose, in  FIG. 8  the receiving element  34  has been let into a recess of the main body  42 . By analogy with  FIG. 7 , here both the first ring  16  and the second ring  18  may consist of an optically dense material. 
     To give the fastening element a visually attractive appearance, it may be provided with a cap-shaped covering panel—not depicted. This panel is fitted over the fastening element  12  adhesively bonded on the installation surface  10 , the receiving element  34  being guided through a hole in the panel. This panel is for its part fixed on the receiving element  34  by the mounting of one of the stationary objects. Alternatively, the covering panel may be provided on its inner lateral surface with a thread for screwing onto the main body  42 . In this case, instead of the main body  42 , the covering panel is provided with the receiving element  34 . 
     Depending on the requirements that exist for the fastening element, various light-curing adhesives may be used as the adhering and connecting agent. For instance, adhesives which, depending on their composition, cure when irradiated with wavelengths in the range between 280 nm and 550 nm are available. Depending on the composition of the adhesive and the light source that is used, the curing times of light-curing adhesives lie between 1 sec and several minutes, but at most 10 min, preferably less than 5 min. Furthermore, full-curing depths of up to 5 mm can be achieved. The width of the adhesive space  14  or the distance between the two rings  16 ,  18  may consequently be up to 10 mm. In this case, the material to be penetrated for the irradiation also plays an important role of course. Adhesives that cure at longer wavelengths normally require somewhat longer for curing, but have a greater full-curing depth. However, LED technology means that light sources that can emit a very intensive radiation, which can shorten the curing times, are available today. 
     The adhesive used may be an acrylate-based or epoxy-based adhesive. The corresponding wavelength for the activation may in this case be set by photoinitiators. Acrylate adhesives, in particular acrylate adhesives which cure by free-radical polymerization, are preferred. 
     The adhesive may also comprise a secondary curing system. In this case, after the irradiation and initiation of the polymerization by irradiation, a further secondary curing reaction that does not require irradiation takes place. This makes curing also possible in regions that were not exposed to the irradiation (shadow zones). Possible systems are anaerobic curing or curing by metal contact, but also heat, i.e. subsequent heating of the fastening element. In the case of anaerobic curing, it may be required that the fastening element consists at least in parts of a substance, for example of aluminum, copper, steel or ceramic, which can emit to the adhesive the metal ions required for the curing, for example of aluminum, copper, steel or ceramic. It may also be a corresponding coating of the fastening element. 
     To fasten the fastening element  12  to the installation surface  10 , the fastening element  12  is first pre-positioned on the installation surface  10 . For this purpose, the rings  16 ,  18  are provided with a fast-acting adhering agent on their side remote from the main body  42  or their side proximate to the installation surface  10 . Suitable, for example, is a transparent double-sided adhesive film which on one side is permanently adhesively bonded to the main body  42  and on the other side has an adhesive surface provided with a protective film. After peeling off the protective film, the fastening element  12  can be pre-fixed on the installation surface. After that, the adhering and connecting agent is introduced into the adhesive space  14  through the filling opening  36  in the main body  42 . By irradiating the adhering and connecting agent through the rings  16 ,  18 , the windows  40  or the transparent main body  42 , the adhering and connecting agent finally cures, so that the stationary objects to be mounted can be attached. If the fastening element  12  does not have a filling opening  36 , the adhering and connecting agent may alternatively be applied in sufficient quantity to the surfaces of the fastening element  12  that form the adhesive space  14 , and smoothed for instance with a trowel, before the positioning of the fastening element  12  on the installation surface  10 . 
       FIG. 1  shows a lighting device  28  with two light sources  29 . The lighting device  28  may be placed onto the installation surface  10  such that the fastening element  12  is located between the light sources  29 . 
       FIG. 2  shows a lighting device  24  with two light sources  26 , which can be inserted through the insertion opening  20  of the fastening element  12  into the cavity  22  and irradiate the adhering and connecting agent through the second ring  18 . To avoid damage to the lighting device  24  caused by canting within the insertion opening  20 , the lighting device  24  preferably comprises a supporting structure  27 . 
     This supporting structure  27  aligns the lighting device  24  perpendicularly to the installation surface  10  during insertion into the insertion opening  20 . Furthermore, the supporting structure  27  may have two lighting devices (not depicted here), which irradiate the adhering and connecting agent through the first ring  16 . 
     The lighting device  32  represented in  FIG. 3  is a lighting device with a single light source  29 , for example a commercially available curing lamp. For curing the adhering and connecting agent from the outside, the lighting device  32  is made to move around the fastening element  12  such that the outer side of the first ring  16  is irradiated completely. 
     As represented in  FIG. 4 , instead of a lighting device with two light sources (cf.  FIG. 1 ), a lighting device  28  with an annular light source  30  may be placed onto the fastening element  12  pre-fixed on the installation surface  10 , in order to cure the adhering and connecting agent located in the adhesive space  14 . 
     In an embodiment of the lighting devices  24 ,  28  given by way of example, a device for generating light is located outside the lighting devices. The generated light is guided to the light sources  26 ,  29 ,  30  of the lighting devices  24 ,  28  by means of light guides. This solution makes uniform irradiation of the adhering and connecting agent possible. Moreover, the lighting device  24  can be formed so compactly that the light source  26  can be inserted into the cavity  22  through the—preferably very small—insertion opening  20 . Alternatively, lenses or mirror elements may be used. It is also possible to install devices for generating light without further elements for light guidance or refraction at the location of the light sources  26 ,  29 ,  30 . 
     DESIGNATIONS 
       10  Installation surface 
       12  Fastening element 
       14  Adhesive space 
       16  First ring 
       18  Second ring 
       20  Insertion opening 
       22  Cavity 
       24  Lighting device for inserting 
       26  Light source 
       27  Supporting structure 
       28  Lighting device for placing 
       29  Light source 
       30  Annular light source 
       32  Lighting device for moving around 
       34  Receiving element 
       36  Filling opening 
       38  Rising opening 
       40  Windows 
       42  Main body 
     LIST OF THE LITERATURE CITED 
     WO 03/036106 A1 
     DE 101 52 053 A1 
     WO 01/81774 A1 
     DE 44 16 884