Abstract:
A window lifter rail includes a pulley and a pulley cover. The pulley cover can be fastened to the window lifter rail in various positions. This ensures an assembly unit that offers a more flexible use while also reducing the production and installation costs.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     The application claims priority to German Application No. 10 2004 039 851.8, which was filed on Aug. 17, 2004.  
         [0002]     The invention relates to a window lifter rail comprising a pulley and a pulley cover.  
         [0003]     Window lifter rails with pulleys are used in cable pull type window lifters that lift and lower vehicle window panes. One known cable pull type window lifter includes a tensile member that is wound around a cable drum and several pulleys. In this arrangement, the pulleys are arranged on a window lifter rail, and the tensile member is connected to a driving dog. When the cable drum rotates, the driving dog is lifted and lowered and the window pane is moved to a desired position.  
         [0004]     Traditionally, window lifter rails include a rigid abutment that deflects the tensile member at an angle in a region of the pulleys. Different angles require different rigid abutments, such that each complete assembly unit for a respective operating condition has a unique rigid abutment. This results in significantly increased costs, because a required deflection angle of the tensile member for force transmission varies according to vehicle type, and can vary within one vehicle type depending on window type.  
         [0005]     It is the objective of the invention to provide an assembly unit for application in window lifters that offers a more flexible use in order to reduce the amount of work involved during production and to reduce costs.  
       SUMMARY OF THE INVENTION  
       [0006]     The subject invention provides a window lifter rail with a pulley and a pulley cover wherein the pulley cover can be fastened to the window lifter rail in various positions. The advantages achieved with the invention are in particular that the window lifter rail can be flexibly adapted to respective operating conditions. One important advantage is that the pulley and the pulley cover can be adapted to a specific vehicle type only on site, the production of these components is not dependent on the vehicle type and may be automated. This results in a decrease in production costs.  
         [0007]     A compact assembly unit is made available in one embodiment, in which the window lifter rail is formed in one piece and the pulley and the pulley cover are directly fastened to the window lifter rail.  
         [0008]     It is preferred that a fastening plate is mounted to the window lifter rail, the pulley and the pulley cover being fastened to this fastening plate. This is why a pre-assembly of the pulley and the pulley cover on the fastening plate is made possible, and the pre-assembled unit can be fastened to a vehicle at a later point in time.  
         [0009]     Further, the pulley cover is preferably fastened or pre-fixed with hooks. Such hooks are commonly known as effective fastening elements that ensure a quick and reliable locking in place in the window lifter rail, and at the same time may be released quickly. Moreover, the production costs of such connections are low.  
         [0010]     It is preferred that for a tensile member, such as a Bowden cable for example, a required abutment for sheathing is immediately integrated in the pulley cover, whereby it is possible to ensure that the tensile member remains in associated grooves of the pulleys, in particular during installation on the vehicle. A slot provided in the abutment receives the tensile member.  
         [0011]     These and other features of the present invention can be best understood from the following specification and drawings, the following of which is a brief description. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0012]      FIG. 1  shows a schematic illustration of a cable pull type window lifter according to prior art.  
         [0013]      FIG. 2  is a perspective partial view of a front of a window lifter rail according to the present invention.  
         [0014]      FIG. 3  is a partial view of a rear of the window lifter rail according to the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0015]      FIG. 1  schematically shows a traditional structure of a cable pull type window lifter  8 . A tensile member  10  is wound around a cable drum  12  and is coupled by the cable drum  12  to a cable drive (not shown). The tensile member  10  is guided in a closed loop over a lower pulley  14  and an upper pulley  16 . The lower and upper pulleys  14 ,  16  are fastened to a window lifter rail  18 , and the tensile member  10  is provided with a sheathing at intermediate sections  38  between the lower and upper pulleys  14 ,  16  and the cable drum  12 , if necessary. A driving dog  20  is connected with the tensile member  10  and with a window pane (not shown), so that the window pane can be moved upwards or downwards to a desired position by rotating the cable drum  12 . The exact function of a cable pull type window lifter  8  will not be discussed here, since it is known from prior art and the invention related to deflection of the tensile member  10  in a region of the lower and upper pulleys  14 ,  16 .  
         [0016]      FIG. 2  shows a part of the window lifter rail  18  with the upper pulley  16  in a configuration incorporating the subject invention. The lower pulley  14  has a similar design.  
         [0017]     A fastening plate  22  is mounted to the window lifter rail  18 . The window lifter rail  18  is inserted in a pocket on the fastening plate  22  and is connected with the fastening plate  22  by a connecting element  24 , which is preferably a rivet or screw.  
         [0018]     The upper pulley  16  has a peripheral groove  26  adapted to guide the tensile member  10 . A pulley cover  28  is arranged over the upper pulley  16  and partially covers the upper pulley  16 . The upper pulley  16  and the pulley cover  28  are commonly fastened to the fastening plate  22  by a second connecting element  30  such as a screw or rivet. The upper pulley  16  is rotatably supported and the pulley cover  28  is immovably mounted to the fastening plate  22  by hooks  34  ( FIG. 3 ).  
         [0019]     The pulley cover  28  has an abutment  32  on one of its ends. The tensile member  10  has a sheathing  36  at the intermediate sections  38  ( FIG. 1 ) of the tensile member  10 . Ends of the sheathing  36  rest against the abutment  32 , because the tensile member  10  preferably is realized as a Bowden cable. As the use of a Bowden cable is known in this field, this will not be explained in further detail here.  
         [0020]     The tensile member  10  is guided generally in parallelism to the window lifter rail  18  and in the peripheral groove  26  of the upper pulley  16 . At the abutment  32 , the tensile member  10  leaves the upper pulley  16  and the pulley cover  28  in the desired direction.  
         [0021]     Upon actuation of the cable drive (not shown) the tensile member  10  is moved in a clockwise or counter clockwise direction, depending on the direction of movement of the window pane (not shown). In this process, friction of the tensile member  10  on the upper pulley  16  may virtually be neglected, because the upper pulley  16  is rotatably supported.  
         [0022]      FIG. 3  shows a rear of the window lifter rail  18 . The pulley cover  28  is fastened to the fastening plate  22  by hooks  34 . These hooks  34  engage in annular cut-outs  40  that are arranged in sections on the fastening plate  22 .  
         [0023]     The pulley cover  28  is assembled in the following manner. At first, the pulley cover  28  is pre-assembled on the fastening plate  22  by the hooks  34 . In so doing, the pulley cover  28  can be arranged in various positions (see the arrow in  FIG. 2 ) without requiring a tool. If the pulley cover  28  is arranged with the desired angle, the pulley cover  28  is fastened in the respective position with the second connecting element  30 . In this way the desired deflection angle of the tensile member  10  (in this embodiment between 45° and 90°) can be adjusted. This is why the deflection angles, which vary depending on the vehicle type, can be altered without newly producing the individual components of the window lifter rail in an expensive way.  
         [0024]     Although a preferred embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.