Abstract:
This invention relates to a shade arrangement for a motor vehicle with at least two shades having lengths of shade material ( 10   a   , 10   b ), which are located next to one another and to one end of which a respective pull ( 14   a,    14   b ) is attached. Both of the lengths of shade material ( 10   a   , 10   b ) are drawn out and taken up in the same direction at their opposite end from/onto a common roller tube ( 12 ) which is pretensioned in the take-up direction.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of Invention 
         [0002]    This invention relates to a shade arrangement for a motor vehicle with at least two shades which are located next to one another, and to which a respective pull is attached. 
         [0003]    2. Description of Related Art 
         [0004]    Shade arrangements for use in motor vehicle construction are known from numerous documents. They are used, for example, as sun protection under a transparent vehicle body surface or as a covering for the cargo space in a station wagon. Often, these shade arrangements consist of a single length of shade material which is attached on one end to a roller tube and is tensioned against the reset force of the roller tube. The other end of the length of shade material is, conventionally, attached to a pull with which the length of shade can be drawn off the roller tube by an electric drive or by hand. 
         [0005]    However, shade arrangements for motor vehicles are also known in which there are multiple shades. Thus, for example, German Patent Application DE 38 13 153 A1 and corresponding U.S. Pat. No. 4,979,775 and German Patent Application DE 199 10 949 A1 each disclose shade arrangements for windshields of motor vehicles having two shades in which two lengths of shade material are located at a distance from one another on two separate roller tubes. However, the use of two separate roller tubes for the lengths of shade material is disadvantageous in these embodiments since this increases material and installation cost. 
         [0006]    German Patent DE 197 50 713 C1 discloses a shade arrangement for a motor vehicle in which two lengths of shade material which are drawn out in opposite directions can be taken up on a common roller tube again in opposite directions, and in the taken-up state, come to rest congruently on one another. German Patent Application DE 197 22 722 A1 discloses a shade arrangement in which a number of individual lengths of shade material are wound between two common roller shafts. In any case, here, in turn, there are separate roller tubes for each individual shade on one of the two common winding shafts. 
       SUMMARY OF THE INVENTION 
       [0007]    The object of this invention is to devise a shade arrangement for a motor vehicle in which there are at least two lengths of shade material located next to one another, and in which the number of components and thus the production and installation costs are reduced. This object is achieved by a shade arrangement wherein the shades are taken up onto and withdrawn from the same roller tube in the same direction, and the roller tube is pretensioned in a take-up direction. 
         [0008]    In achieving the object in accordance with the invention, the different lengths of shade material are taken up on one end onto an individual, common roller tube which is pretensioned in the take-up direction. Thus a shade arrangement for a motor vehicle can be devised in which there are at least two lengths of shade material which are located next to one another and in which the number of elements used for the entire shade arrangement is reduced compared to the known arrangements. 
         [0009]    The invention is explained in detail below by way of example with reference to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  is a schematic view of a shade arrangement for a vehicle with two lengths of shade located next to one another; 
           [0011]      FIG. 2  is a schematic cross section through the pull of the shade arrangement in accordance with the invention; and 
           [0012]      FIG. 3  is a schematic cross section of an alternative embodiment of the pull of a shade arrangement in accordance with the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0013]      FIG. 1  shows a shade arrangement in accordance with the invention for a motor vehicle with two shades having lengths of shade material  10   a ,  10   b  which are located next to one another, and to which a respective pull  14   a,    14   b  is each of the lengths of shade material. In accordance with the invention, at this point, the end of each of the two lengths of shade material  10   a ,  10   b  which faces away from the pull  14   a,    14   b  can be taken up onto a single common roller tube  12  which is pretensioned in the take-up direction. The roller tube  12  is rotatably mounted, here, in the vehicle body (not shown) and the two pulls  14   a,    14   b  are movably guided in body-mounted guides (not shown) for drawing the two lengths of shade material  10   a ,  10   b  off the roller tube  12 . A shade arrangement as shown here is used preferably as sun protection in a motor vehicle roof, in which in the region of the two drawn lengths of shade  10   a ,  10   b , roof glazing is inserted into the roof skin and the roof skin is made unglazed in the region between the two lengths of shade material and/or for example, has a center bracket. However, since the two lengths of shade material  10   a,    10   b  are taken up onto a common roller tube  12 , on the one hand, there is the advantage that the number of installed parts is reduced as compared to designs with separate roller tubes since, for example, fewer roller bearings are necessary. On the other hand, the complexity and effort for installation are also reduced. tool. In other preferred embodiments of the invention, the lengths of shade material  10   a,    10   b  can be made from an elastic material so that in spite of possibly different drawing lengths of the individual shades, tension in the two lengths of shade material can be maintained and sagging of an individual shade can be avoided. These differences in the drawing lengths arise, for example, when cable offset occurs in a drive line with two drive cables for the two lengths of shade material  10   a,    10   b.  Furthermore, due to a certain amount production tolerances in the length of the lengths of shade material  14   a,    14   b  can also be equalized. 
         [0014]      FIG. 2  shows a cross section through the pull  14  of a shade arrangement in accordance with the invention for a motor vehicle. The pull  14  has an insertion gap  18  into which a shade material  10  is fastened on its end (facing away from the roller tube) by its being guided around a piped wire  16 , the piped wired together with the turned-down shade length being inserted into the insertion gap. The shade material  10 , proceeding from the pull  14  is guided around a deflection element  22  and continues to run in the direction of the roller tube after a deflection edge  28  which is molded on the deflection element. Along the pull  14 , the material adjoins its contact surface  20 . The deflection element  22  is connected to the pull  14  by being movably guided, on the one hand, in the guide channel  26  of the pull, and on the other hand, is pretensioned in a direction away from the pull and from the roller tube by means of spring elements  24 . The spring tension of the spring elements  24  also tensions the length of shade material  10  away from the pull  14  and the roller tube via the deflection element  22 . This ensures that, even for different extension lengths of the different pulls  14   a,    14   b  of several lengths of shade material  14   a, b , for the aforementioned reasons, these lengths of shade material remain tensioned. Differences in the lengths of the lengths of shade material  14   a,    14   b  can likewise be equalized and sagging of individual lengths of shade material  14   a,    14   b  is thus avoided overall. 
         [0015]    In alternative embodiments of the invention, the deflection element is not pretensioned away from the pull by spring elements, as shown in  FIG. 2 , but the position of the deflection element relative to the pull can be adjusted via a positioning mechanism such that, in turn, sagging of individual lengths of shade material is avoided. Such a positioning mechanism can, for example, contain a screw mechanism. 
         [0016]    One embodiment of a pull  14  alternative to  FIG. 2  with a deflection element  22  is schematically shown in  FIG. 3  in a cross section. Similarly to  FIG. 2 , the shade material  10  is also fixed here by means of a piped wire  16  on the pull  14  and is guided further around the deflection element  22  around a deflection edge  28  which is molded on this deflection element in the direction of a roller tube which likewise is not further shown here. However, in contrast to  FIG. 2 , the deflection element  22  of  FIG. 3  is not movably guided in the pull  14 , but it is a separate deflection element which influences the tension of the assigned shade length  10  based on its periphery. The correspondingly dimensioned deflection element  22  is connected to the pull  14  by being inserted into a groove  32  of the pull between the pull and shade material  10 . Different tensions of different lengths of shade material  10  of the shade arrangement in accordance with the invention can now be equalized by differently dimensioned deflection elements  22  being inserted into the different pulls  14 . For example, for the different deflection elements  22 , the distance between the deflection edge  28  and the end position of the piped wire  16  in the pull  14  can be different or alternatively or additionally the periphery of the deflection element. But a deflection edge  22  can also be completely omitted in order to reduce the tension of a certain length of shade  10 , by which this shade material is then deflected around the edge  30  of the pull which is molded onto the pull  14  in the direction of the take-up shaft. 
         [0017]    Preferably, at this point, the deflection element  22  and pull  14  and its groove  32  are made such that the deflection element can be inserted into the pull transversely to the drawing direction of the length of shade  10 . Thus, for example, during installation, when the shade material  10  is already guided around the pull  14 , another deflection element  22  can be inserted later or if necessary also replaced. A shade arrangement in accordance with the invention can also be made such that the difference in the tensions in the different lengths of shade material  10  can also be equalized later by replacing the deflection elements  22  in the maintenance of the length of shade.