Abstract:
A fastening device is provided for attaching an exterior trim strip ( 1 ) to a carrying structure. In order to simplify attachment of the exterior trim strip to the carrying structure, the fastening device has latching or clipping-connection elements ( 21 - 24 ), which are latched or clipped to an interior trim strip ( 33 ) for fastening the exterior trim strip ( 1 ) on the interior trim strip ( 33 ).

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority under 35 USC 119 to German Patent Appl. No. 10 2012 103 833.3 filed on May 2, 2012, the entire disclosure of which is incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a fastening device for attaching an exterior trim strip to a carrying structure. 
     2. Description of the Related Art 
     German Utility Model DE 297 08 654 U1 discloses a cover strip for motor vehicles, for surrounding window cutouts. The cover strip includes a retaining rail and a functional rail. The retaining rail is secured on a bodywork and the functional rail can be pushed into the retaining rail for making a mutual form-fitting connection. A fastening strip is arranged on the retaining rail and can be secured on the visible and/or functional rail. 
     It is an object of the invention to simplify attachment of an exterior trim strip to a carrying structure. 
     SUMMARY OF THE INVENTION 
     The invention relates to a fastening device for attaching an exterior trim strip to a carrying structure. The fastening device comprises latching or clipping-connection elements that are latched or clipped to an interior trim strip so that the exterior trim strip to be fastened on the interior trim strip. The exterior trim strip and the interior trim strip preferably are part of a door of a motor vehicle, in particular to a rear door of the motor vehicle. The two trim strips preferably surround a window opening that can be closed by a door window. The latching or clipping-connection elements make it possible to dispense with additional fastening means for attaching the exterior trim strip to the carrying structure. The fastening device of the invention preferably attaches the exterior trim strip to the interior trim strip in an upper, front region of the vehicle door. The terms upper, front and rear relate to a motor vehicle that is equipped with the fastening device of the invention. 
     The latching or clipping-connection elements preferably are configured as curved latching or clipping fingers or latching hooks. The latching or clipping-connection elements may each comprise a latching or clipping finger or latching hook. However, it is preferable for the latching or clipping-connection elements to comprise a plurality of latching or clipping fingers or latching hooks. 
     The curved latching or clipping fingers or latching hooks preferably have their free ends engaging behind a fastening bead that is formed on the interior trim strip. The fastening bead, as seen in cross section preferably is formed at a free end of a limb of the interior trim strip. The interior trim strip preferably comprises a plurality of limbs, of which at least one is arranged on the inside in the visible region of the motor vehicle. The limb of the interior trim strip with the fastening bead advantageously extends in the direction of the exterior trim strip. 
     The latching or clipping-connection elements preferably extend from a latching or clipping strip that is fastened on the exterior trim strip. The latching or clipping strip preferably comprises plurality, for example four, latching or clipping-connection elements, each of which has plural, for example three, latching or clipping fingers or latching hooks. The latching or clipping strip with the latching or clipping-connection elements preferably is formed from a material different from the material that is used for the exterior trim strip and/or the interior trim strip. 
     The latching or clipping strip preferably is connected integrally to the exterior trim strip. The latching or clipping strip preferably is bonded adhesively to the exterior trim strip so that the latching or clipping strip can be fastened stably on the exterior trim strip. 
     The latching or clipping strip with the latching or clipping-connection elements preferably is formed from plastic. This considerably simplifies the production of the latching or clipping strip with the latching or clipping-connection elements. Furthermore, a suitable plastic can be used to readily realize a certain degree of elasticity, in particular elastic deformability, of the latching or clipping-connection elements. The plastic is, for example, a polyamide material reinforced with glass fibers. 
     The exterior trim strip preferably is formed from light metal, such as an aluminum material. Lugs may be formed on the exterior trim strip, in portions in which there are no latching or clipping-connection elements. The lugs make it possible for the exterior trim strip to be screwed to the carrying structure. The exterior trim strip preferably has, on the outside, at least one visible region that comprises, for example, at least one light edge. The latching or clipping strip with the latching or clipping-connection elements thus advantageously is fastened on the inside of the exterior trim strip. 
     The exterior trim strip may have an essentially U-shaped cross section with a base that constitutes a visible region on the outside. The visible region may have a light edge. The latching or clipping strip with the latching or clipping-connection elements may advantageously be fastened on the inside of the base of the exterior trim strip. 
     A long limb preferably is angled from the base of the exterior trim strip and covers over the latching or clipping-connection elements to ensure that the latching or clipping-connection elements cannot be seen from the outside. 
     A short limb is angled from the base of the exterior trim strip and extends toward a window. The short limb improves the overall visual impression of the fitted exterior trim strip. 
     The interior trim strip preferably is an extruded profile. The interior trim strip may be configured from the same material as the exterior trim strip. An extruded profile has the advantage that a fastening bead readily can be formed on the interior trim strip. The fastening bead makes it easier to realize the latching or clipping connection. 
     The invention also relates to an exterior trim strip, an interior trim strip and/or a latching or clipping strip of a fastening device described above. The exterior trim strip, the interior trim strip and/or the latching or clipping strip can be handled separately. 
     Further advantages, features and details of the invention can be gathered from the following description, in which exemplary embodiments are described with reference to the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an exterior trim strip according to the invention. 
         FIG. 2  shows a region of the exterior trim strip from  FIG. 1  with latching or clipping-connection elements. 
         FIG. 3  is a cross-sectional view taken along line III-III in  FIG. 1 . 
         FIG. 4  is a perspective illustration of the section from  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIG. 1  is a perspective illustration of an exterior trim strip  1  of a motor vehicle. The exterior trim strip  1  is formed from aluminum. Fastening lugs  4  are fit on a basic strip body  3  of the exterior trim strip  1 . 
     The fastening lugs  4  may be formed on the basic strip body  3  and may function to fasten the exterior trim strip  1  on a suitable carrying structure. Fastening of the exterior trim strip  1  on the carrying structure using the fastening lugs  4  advantageously can be carried out with the screws that are screwed into the carrying structure through the fastening lugs  4 . 
     The fastening lugs  4  are not provided throughout the exterior trim strip  1 , and a double arrow  6  indicates a region in which there are no fastening lugs on the exterior trim strip  1 . Fastening the exterior trim strip  1  on the carrying structure takes place differently in the region  6  than is the case in conventional systems. 
     The exterior trim strip  1  is fastened on an interior trim strip (not illustrated in  FIG. 1 ) in the region  6 . The exterior trim strip  1  and the interior trim strip are assigned to a window opening in a rear door of the motor vehicle. The exterior trim strip  1  has the region  6  arranged in an upper, front region of the rear door of the motor vehicle. 
     The region  6  of the exterior trim strip  1  is visible from the outside in  FIG. 1 , and  FIG. 2  shows this region in perspective view from the inside. It can be seen in  FIG. 2  that the basic strip body  3  has an essentially U-shaped cross section with a base  10  from which first and second limbs  11  and  12  are angled inward. 
     The first limb  11  is longer than the second limb  12 , and therefore also is referred to as long limb  11 . Analogously, the limb  12  is referred to as short limb  12 . 
     Latching or clipping-connection elements  21 ,  22 ,  23 ,  24  are fastened on the inside of the base  10  of the exterior trim strip  1 . The latching or clipping-connection elements  21  to  24  are joined unitarily to a latching or clipping strip  28 . The latching or clipping strip  28  with the latching or clipping-connection elements  21  to  24  is an elastically flexible material. 
     In the illustrated embodiment, the latching or clipping strip  28  with the latching or clipping-connection elements  21  to  24  is formed from a glass-fiber-reinforced polyamide designated PA66GF30. The latching or clipping strip  28  is configured, for example, as a thin-walled injection molding and is adhesively bonded, in certain regions, to the base  10  of the exterior trim strip  1 . 
     The latching or clipping-connection elements  21  to  24  each comprise a plurality of latching or clipping fingers hooks. The latching or clipping fingers or hooks are angled from the latching or clipping strip  28  and are curved configuration. 
       FIGS. 3 and 4  illustrate different sectional views of a vehicle door  30  with a door window  31 . The vehicle door  30  is a rear door of a motor vehicle.  FIG. 3  indicates a contour  32  of a door opening in an upper, front region. The exterior trim strip  1 , which is illustrated on its own in  FIG. 1 , is fastened on an interior trim strip  33  of the vehicle door  30  in the region  6  with the aid of the latching or clipping strip  28 . 
     As shown in  FIG. 3 , the exterior trim strip  1  is fastened on the interior trim strip  33  with the aid of one of a number of clipping mechanisms  34 . The clipping mechanism  34  is realized by the latching or clipping-connection element  22 , which is configured as a latching hook and extends from the latching or clipping strip  28  and is hooked to a limb  35  of the interior trim strip  33 . 
     The interior trim strip  33  comprises, as seen in cross section, a total of four limbs  35 ,  36 ,  37  and  38 . The limb  35  extends, essentially perpendicularly to the door window  31 , in the direction of the exterior trim strip  1 . The two limbs  37  and  38  are arranged essentially parallel to the door window  31 . The limb  36  is directed toward the interior of the motor vehicle. The limb  36  of the interior trim strip  33  here extends approximately at an angle of 60 degrees to the door window  31 . 
     The latching or clipping strip  28  is fastened on the inside of the base  10  of the exterior trim strip  1 . Spots  48  are used to indicate that the latching or clipping strip  28  is bonded adhesively to the base  10  of the exterior trim strip  1 . The base  10  of the exterior trim strip  1  runs essentially parallel to the door window  31 . A light edge  39  is arranged in a visible region  40  on the outside of the base  10  of the exterior trim strip  1 . 
     Six connection parts  41 ,  42 ,  43 ,  44 ,  45 ,  46  also can be seen in the detail of the vehicle door  30  illustrated in  FIG. 3 . The connection parts  41  to  46  are predominantly sealing elements, which end up butting with sealing action against the door window  31  or against the contour  32  of the door opening. 
     The connection parts  41  to  46  are fastened on the interior trim strip  33  or on a further carrying structure of the motor-vehicle door  30 . The interior trim strip  33  may itself be designed as a carrying structure of the motor-vehicle door  30 . However, it is also possible for the interior trim strip  33  to be fastened on a further carrying structure of the vehicle door  30 . 
       FIG. 4  shows that the latching or clipping-connection element  24  comprises a total of three latching or clipping fingers  51 ,  52 ,  53  that extend from the latching or clipping strip  28 . The latching or clipping fingers  51  to  53  are configured as curved latching hooks that engage behind a fastening bead  55 . The fastening bead  55  is formed at a free end of the limb  35  of the interior trim strip  33 . The fastening bead  55  constitutes a nose that interacts with the latching hooks  51  to  53  to define the clipping mechanism  34 . 
     The exterior trim strip  1  is indicated merely as a cross section in  FIG. 4  so that the latching or clipping strip  28  concealed beneath the exterior trim strip  1  can be seen. This illustration shows that the long limb of the exterior trim strip  1  engages over the latching or clipping fingers  51  to  53  so that the latching or clipping fingers  51  to  53  are concealed and cannot be seen from the outside.