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CROSS-REFERENCE TO A RELATED APPLICATION 
       [0001]    This application is a National Phase Patent Application of International Patent Application Number PCT/EP2011/064452, filed on Aug. 23, 2011, which claims priority of German Utility Model Application Number 20 2010 012 567.7, filed on Sep. 8, 2010. 
     
    
     BACKGROUND 
       [0002]    The invention relates to a cable deflecting piece for a cable operated window lifter which comprises at least one guide rail wherein the cable deflecting piece is to be fastened to the rail head or rail foot thereof. 
         [0003]    From DE 38 05 576 C2 an attachment for a cable deflecting piece on a guide rail of a cable window lifter is known, whereat the guide rail is provided with a recess, into which a grip protrusion projecting from the cable deflecting piece with a nose projecting across to the longitudinal direction of the guide rail from the grip protrusion is inserted, which overlaps an edge section of the recess on the external side of the guide rail facing away from the cable deflecting piece. By a pivoting movement of the cable deflecting piece about the edge section into the mounting position with a pivoting axis parallel to the longitudinal direction of the guide rail the latching protrusion overlaps a terminal edge section of the guide rail for a locking abutment against the external side of the guide rail. For securing the cable deflecting piece in the mounting position the latching protrusion provided on the cable deflecting piece engages into a latching counter area of the guide rail when the stop protrusion is inserted into the recess, wherein a spring tongue formed in the latching protrusion blocks a pivoting movement out of the mounting position. 
         [0004]    From DE 80 32 764 U1 a cable deflecting piece for a Bowden cable window lifter is known, which is attached to an end of the guide rail for connecting to a guide rail of the window lifter and comprises an undercut latching protrusion on the side thereof facing the guide rail, wherein between said protrusion and the cable deflecting piece a free gap is obtained, which corresponds to the material thickness of the guide rail. The latching protrusion comprises on the end of its inner side a protrusion, which engages into a recess of a guide rail when attaching the cable deflecting piece to the guide rail and secures thereby the cable deflecting piece against a removal from the guide rail. In addition an undercut nose arranged on the cable deflecting piece with a distance from the latching protrusion engages with the recess of the guide rail when attaching the cable deflecting piece and secures thus the cable deflecting piece against a tilting after attachment to the guide rail. 
       SUMMARY 
       [0005]    Object of the present invention is to provide a cable deflecting piece, which allows fora simple and fast assembly when mounting the cable deflecting piece on the rail head or rail foot of a guide rail and guarantees a high stability of the connection between the cable deflecting piece and the guide rail. 
         [0006]    The solution according to the invention allows for an insertion of the cable deflecting piece with a rotary and bearing pin projecting from the base body into a rotary and bearing opening of the rail head or rail foot in a position tilted in relation to the longitudinal extension of a guide rail and performs thus an exact prepositioning without that a readjustment of the cable deflecting piece for the mounting thereof on the rail head or rail foot is required. By subsequent rotation or pivoting of the cable deflecting piece about the mounting rotation axis formed by the rotary and bearing pin projecting from the base body and the rotary and bearing opening on the rail head or rail foot a rotation prevention means is activated in a final mounting position, which secures the connection of the cable deflecting piece to the rail head or rail foot against an undesired rotation of the cable deflecting piece about the mounting rotation axis, and a secure, stable abutment of the base body against the rail head or rail foot perpendicular to the longitudinal extension of the guide rail, that means in X-direction as well as also in particular in Y-direction of a motor vehicle with a cable window lifter installed in a motor vehicle door is guaranteed by the device formed on the base body for securing the abutment. 
         [0007]    Due to the form fitting connection of the rotary and bearing pin projecting from the base body to the rotary and bearing opening formed in the rail head or rail foot the cable deflecting piece is secured against a removal from the rail head or rail foot, the assembly thereof is alleviated due to an exact guidance of the cable deflecting piece by the formation of the mounting rotation axis, an unintended deassembly of the cable deflecting piece from the guide rail via back rotation is prevented by the rotation prevention and due to the device formed on the base body for securing the abutment of the base body against the rail head or rail foot a tilting of the cable deflecting piece perpendicular to the longitudinal extension of the guide rail that means perpendicular to the guiding plane of the guide rail is prevented. Due to this multiple securing of the cable deflecting piece, which is affected by a simple mounting with an inserting and pivoting movement, a secure connection of the cable deflecting piece to the rail head or rail foot of a guide rail is also guaranteed under load. 
         [0008]    Alternatively or in addition to a corresponding design of the rotation prevention means and the device for securing the abutment of the base body against the rail head or rail foot a stop area can be formed on the base body of the cable deflecting piece for a further alleviation of the mounting, which abuts in the final mounting position against a part of the terminal edge of the rail head or rail foot and prevents thus a further rotation or pivoting of the cable deflecting piece about the mounting rotation axis. 
         [0009]    The rotation prevention means comprises advantageously at least one latching element integrated into the base body which snaps after a pivoting of the cable deflecting piece about the mounting rotation axis in the final mounting position into a latching recess on the rail head or rail foot. 
         [0010]    This design of the rotation prevention means prevents with a simple constructive means a back rotation of the cable deflecting piece into the starting mounting position and secures in combination with the stop area formed on the base body the cable deflecting means against a rotation about the mounting rotation axis in both rotation directions. 
         [0011]    A first latching element consists of a latching nose projecting from the base body with a lead-in chamfer and a latching edge, which abuts in the final mounting position of the cable deflecting piece against a latching edge of a recess formed as a latching receptacle in the rail head or rail foot of the guide rail. 
         [0012]    Alternatively, but preferably in addition to the first latching element, a second latching element is provided which consists of an elastic, bendable latching hook projecting from the base body, which when mounting the cable deflecting piece on the rail head or rail foot of the guide rail by pivoting the cable deflecting piece about the mounting rotation axis slides at least partially on a first side arm of the guide rail in an elastic relentless manner and abuts in the final mounting position against a latching stop on rail head or rail foot of the guide rail. 
         [0013]    Due to the arrangement of in particular two latching elements a high degree of rotation security of the cable deflecting piece is provided such that also large cable forces occurring when operating the cable window lifter do not cause a rotation of the cable deflecting piece out of the final mounting position or operating position and thus the danger of an undesired release of the connection of the cable deflecting piece to the rail head or rail foot of the guide rail occurs. 
         [0014]    The device for securing the abutment of the base body against the rail head or rail foot consists preferably of at least one rear grip originating from the base body and encompassing at least partially a terminal edge of the rail head or rail foot. 
         [0015]    The rear grip is effective in connection with the stop area against a tilting of the cable deflecting piece in X-direction of a motor vehicle and against a removal or tilting of the cable deflecting piece in Y-direction of a motor vehicle. 
         [0016]    The rear grip is thereby formed such that it is distanced after the insertion of the rotary and bearing pin into the rotary and bearing opening in position of the cable deflecting piece tilted in relation to the longitudinal extension of the guide rail and before rotating or pivoting the cable deflecting piece about the mounting rotation axis from the terminal edge of the rail head or rail foot and encompasses the terminal edge in the final mounting position. 
         [0017]    Also the device formed as a rear grip for securing the abutment of the base body against rail head or rail foot can be formed as one piece or in multiple pieces, wherein in particular a multi-piece formation of the rear grip prevents a release of the base body from the abutment against the rail head or rail foot against a tilting in different directions in relation to the stop area of the rail head or rail foot and guarantees thereby the secure abutment of the cable deflecting piece in X- and in particular in Y-direction of the cable window lifter assembled into a motor vehicle door. 
         [0018]    A first rear grip formed on the base body encompasses the terminal edge of a central arm of the guide rail and abuts with a section continuing parallel to the terminal edge of the central arm in the final mounting position against the side of the rail head or rail foot of the guide rail opposing the base body, wherein in between the first rear grip and the base body a slot for inserting the terminal edge of the central arm of the guide rail is provided. 
         [0019]    The first rear grip secures a tight and lasting abutment of the base body and thus of the cable deflecting piece against the rail head or rail foot of the guide rail in Y-direction of a motor vehicle by encompassing the terminal edge of the central arm of the guide rail wherein the slot between the base body and the front side of the strip-like first rear grip receives the terminal edge. 
         [0020]    As an alternative or preferably in addition to the first rear grip a second rear grip can be provided, which is formed as an arm projecting from the base body, which encompasses in the final mounting position a chamfer continuing from the terminal edge of the central arm to the latching stop of the first side arm at an obtuse angle to the terminal edge of the central arm and abuts in the final mounting position with a flat section against the side of the rail head or rail foot of the guide rail opposing the base body. 
         [0021]    Since the second rear grip encompasses the terminal edge of the rail head or rail foot of the guide rail in the area of the chamfer it secures the abutment of the cable deflecting piece in Y-direction as well as the embedding of the base body of the cable deflecting piece into the U-profile of the guide rail and thus also in X-direction of the motor vehicle. 
         [0022]    In order to prevent a collision of the second rear grip with the guide rail when inserting the rotation and bearing pin into the rotation and bearing opening in tilted position of the cable deflecting piece the second rear grip comprises an inclined edge corresponding to the obtuse angle of the chamfer such that when inserting the rotary and bearing pin of the cable deflecting piece into the rotary and bearing opening on the rail head or rail foot of the guide rail the inclined edge continues essentially parallel to the chamfer. 
         [0023]    Altogether this guarantees that in a starting mounting position in which the cable deflecting piece is positioned on the guide rail in a tilted position in respect to the longitudinal extension of the guide rail and the rotary and bearing pin projecting from the base body of the cable deflecting pin is inserted into the rotary and bearing opening of the rail head or rail foot of the guide rail the rear grip collides with the guide rail. Only when pivoting the cable deflecting piece about the mounting rotation axis formed by the rotary and bearing pin and the rotary and bearing opening into the final mounting position the rear grip comes to an abutment against the side of the rail head or rail foot opposing the base body and secures thus the base body against a removal or tilting perpendicular to the guiding area of the guide rail. 
         [0024]    For alleviating the insertion of the rotary and bearing pin projecting from the base body of the cable deflecting piece into the rotary and bearing opening on the rail head or rail foot the rotary and bearing pin is provided on the terminal side with a circumferential lead-in chamfer. 
         [0025]    Besides the rotary and bearing pins serving as mounting aid and being effective as part of a position securing as well as latching and locking elements securing the connection of the cable deflecting piece to the rail head or rail foot of the guide rail the cable deflecting piece comprises as functional elements a carrier stop, which abuts against the terminal edges of an edge arm and a second side arm of the guide rail consisting of ZU-profile for a carrier of the cable window lifter adjustable along the guide rail, which is preferably arranged adjacent to the stop area, which is formed on the base body and abuts in the final mounting position against a part of the terminal edge of the rail head or rail foot, as well as a bended tubular guiding channel for a window lifter cable, which contains a Bowden support on the opening thereof directed away from the guide rail. 
         [0026]    The cable deflecting piece is formed in one piece as injection moulding piece for a simple manufacturing and precise formation of the rotary and bearing pin and the latching and locking elements. 
         [0027]    Alternatively the base body and the latching and locking elements can consist of one singular injection moulding piece, into which the rotary and bearing pin is inserted, in particular injected, as separate metal part, preferably made of steel. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]    The idea on which the invention is based on and the different variants of the solution according to the invention shall be indicated and explained by the means of the embodiments illustrated in the Drawings. 
           [0029]      FIG. 1  shows a schematic isometric illustration of a rail head and a cable deflecting piece before mounting the cable deflecting piece on the rail head. 
           [0030]      FIGS. 2 to 4  show isometric views of the front and back side of the cable deflecting piece. 
           [0031]      FIGS. 5 and 6  show schematic illustrations of a cable deflecting piece and a rail foot of a guide rail in a mounting starting position and an mounting final position or operating position of the cable deflecting piece. 
           [0032]      FIGS. 7 to 10  show isometric illustrations of the front and back side of the rail head of a guide rail with a cable deflecting piece attached to the rail head in tilted position in the mounting starting position and fastening the cable deflecting piece to the rail head in the mounting final position. 
           [0033]      FIG. 11  shows a schematic isometric illustration of the cable deflecting piece connected to the rail head of a guide rail in the mounting final position. 
           [0034]      FIG. 12  shows an enlarged isometric illustration of a part of a cable deflecting piece connected to the rail head. 
       
    
    
     DETAILED DESCRIPTION 
       [0035]    In  FIGS. 1 to 12  the upper end of a guide rail designated as rail head  17  or the lower end of a guide rail  1  designated as rail foot  18  of an otherwise not illustrated single or double stranded cable window lifter is illustrated within a motor vehicle door. A carrier, which is also not illustrated, is movably arranged on the guide rail  1  in longitudinal direction of the guide rail, which is connected to a window pane, which is lifted and lowered according to the moving direction of the carrier. For this purpose the carrier is connected to a window lifter cable, which is guided in a closed loop and is guided by a manual or motored window lifter drive to a cable deflecting piece  3  illustrated in  FIGS. 1 to 12  on the rail head  17  along the guide rail  1  to a corresponding cable deflecting piece on the rail foot  18  back to the window lifter drive. Between the two cable deflecting pieces  3  on rail head  17  and rail foot  18  the window lifter cable is connected to the carrier, for instance via a cable nipple supported in a nipple chamber of the carrier. 
         [0036]    The window lifter cable can be guided in a Bowden cable cover between the cable deflecting pieces  3  and the cable lifter drive, which is supported by a Bowden support  34  according to  FIGS. 1 to 4 . 
         [0037]    As deducible from the isometric illustration of  FIG. 1  the guide rail  1  comprises a ZUprofile, which consists of a U-profile with a centre arm  10 , wherein side arms  11 ,  12  vertically project from the ends thereof, and an edge arm  13  projecting vertically outwards from the side arm  12 . 
         [0038]    The rail head  17  or rail foot  18  comprise for mounting the cable deflecting piece  3  according to  FIGS. 1 and 5  to  12  in the centre arm  10  a preferably rectangular recess  21  and a continuous rotary and bearing opening  23 . A chamfer  15  continues from the terminal edge  14  of the centre arm  10  to the side arm  11 , which is not connected to the edge arm  13 , wherein on the side arm sided end of said chamfer a latching stop  16  is provided. 
         [0039]    The cable deflecting piece  3  consists of a base body  30 , which is arranged after connect ing the cable deflecting piece  3  to the rail head  17  or rail foot  18  in the mounting final position or operating position on the inner side of the ZU-profile of the guide rail  1  in the area of the U-profile between the side arms  11 ,  12 . As in particular deducible from the isometric illustrations of  FIGS. 2 to 4 , a rotary and bearing pin  4  projects from the base body  30 , wherein said pin comprises a circumferential chamfer  40  on its end facing away from the base body  30 . 
         [0040]    The rotary and bearing pin  4  is inserted—as explained in more detail in the following—in the mounting starting position in a, in respect to the mounting final position or operating position of the cable deflecting piece  3  into the rotary and bearing opening  23  on the rail head  17  or rail foot  18  such that the base body  30  comes to abutment against the inner side of the rail head  17  or rail foot  18 . 
         [0041]    The base body  30  contains a bended tubular cable channel  33 , which comprises on one end thereof a Bowden support  34  and which passes on its other end into a sliding channel  35  for the window lifter cable. In the mounting final position or operating position of the cable deflecting piece  3  the sliding channel  35  is directed to the longitudinal extension of the guide rail  1 , while the opening provided on the opposite end of the cable channel  33  points with the Bowden support  34  to the window lifter drive. 
         [0042]    In the mounting final position or operating position a stop area  31  formed on the base body  30  abuts against the terminal edges  19  of the side arm  12  and edge arm  13  of the rail head  17  or rail foot  18  as terminal stop. Adjacent to the stop area  31  a stop  32  is formed stepwise for the carrier guided in a longitudinally adjustable manner on the guide rail  1 . 
         [0043]    Multiple latching and locking elements are integrated into the base body  30  of the cable deflecting piece  3 , which serve in different functions for rotation prevention or for securing the abutment of the cable deflecting piece  3  in Y direction on the rail head  17  or rail foot  18 . For rotation prevention a latching element integrated into the base body  30  is provided according to  FIGS. 2 to 4 , which is formed as latching nose  5  with a lead-in chamfer  50  and a latching edge  51  and snaps in the mounting final position into the recess  21  on the rail head  17  or rail foot  18  such that the latching edge  51  of the latching nose  5  abuts against a latching edge  22  of the recess  21  and thus a back rotation of the cable deflecting piece  3  out of the mounting final position or operating position into the mounting starting position is prevented. 
         [0044]    In the same manner a second latching element acts, which is formed as latching hook  6  and comprises an elastic bar  60  and a latching head with a latching edge  61 , which abuts in the mounting final position against the latching stop  16  on the terminal edge of the side arm  11  and also prevents a back rotation of the cable deflecting piece  3  out of the mounting final position into the mounting starting position. 
         [0045]    For securing the abutment of the base body  30  against the inner side of the rail head  17  or rail foot  18  and thus for securing the cable deflecting piece  3  in direction vertical to the area of the guide rail, that means for securing the cable deflecting piece  3  in Y direction of the motor vehicle in case of a cable window lifter inserted into a motor vehicle door adjacent to the latching nose  5  a first strip-like rear grip  7  is provided, which encompasses the terminal edge  14  of the centre arm  10  of the rail head  17  or rail foot  18  and abuts against the section of the external side of the rail head  17  or rail foot  18  adjacent to the terminal edge  14 . For receiving the terminal edge  14  and the sections following the terminal edge  14  an insertion slot  36  is provided on the internal side and external side of the rail head  17  or rail foot  18  according to  FIG. 4 . 
         [0046]    A second rear grip  8  is provided adjacent to the first strip-like rear grip  7 , which encompasses the chamfer  15  between the terminal edge  14  of the centre arm  10  and the latching stop  16  of the side arm  11  and abuts also against the external side of the rail head  17  or rail foot  18 . The second rear grip  8  comprises an inclined edge  80 , which faces in the mounting starting position the chamfer  15  and thus allows the insertion of the rotary and bearing pin  4  into the rotary and bearing opening  23 . 
         [0047]      FIGS. 5 and 6  show in a schematic top view the previously, by the means of  FIGS. 1 to 4  described mounting, latching and locking elements of the cable deflecting piece  3  and the rail head  17  or rail foot  18  of the guide rail  1  for aligning and mounting the cable deflecting piece  3  to the rail foot  18  of the guide rail  1  as well as the mounting steps starting from an mounting starting position illustrated in  FIG. 5  into an mounting final position or operating position of the cable deflecting piece  3  in respect to the guide rail illustrated in  FIG. 6 . 
         [0048]      FIG. 5  shows schematically the cable deflecting piece  3  in the mounting starting position, in which it is tilted in respect to the longitudinal extension of the guide rail  1  such that the inclined edge  80  of the second rear grip  8  is aligned almost parallel to the chamfer  15  on the rail foot  18  and the strip-like first rear grip  7  serving as Y protection is opposite to the crossing of the terminal edge  14  of the centre arm  10  to the chamfer  15  and the latching head of the latching hook  6  is opposite to the internal side of the side arm  11 . In this tilted position of the cable deflecting piece  3  the rotary and bearing pin  4  is inserted into the rotary and bearing opening  23  of the rail foot  18 , wherein the circumferential chamfer of the rotary and bearing pin  4  allows for the insertion into the rotary and bearing opening  23 . 
         [0049]    After inserting the rotary and bearing pin  4  into the rotary and bearing opening  23  until abutment of the base body  30  against the internal side of the rail foot  18  the cable deflecting piece  3  is pivoted in direction of arrow A about the mounting rotary axis formed by the rotary and bearing pin  4  and the rotary and bearing opening  23 , wherein the latching head of the latching hook  6  slides along the internal side of the side arm  11  and the second rear grip  8  slides with its inner face along the external side of the centre arm  10  and the latching nose  5  slides along the internal side of the centre arm  10 . The insertion slot  36  formed between the strip-like first rear grip  7  and the base body  30  moves thereby over the terminal edge  14  of the centre arm  10 . 
         [0050]    The rotation of the cable deflecting piece  3  is continued until the stop area  31  abuts against the terminal edge  19  of the side arm  12  and edge arm  13 , the latching nose  5  snaps into the recess  21  of the rail foot  18  and the latching edge  61  engages at the latching head of the latching hook  6  with the latching stop  16  at the end of the side arm  11 . In this mounting final position or operating position of the cable deflecting piece  3  illustrated in  FIG. 6  the second rear grip  8  abuts with its inner face against the external side of the centre arm  10  and the strip-like first rear grip  7  abuts for Y-protection of the cable deflecting piece  3  against the section of the external side of the rail foot  18  being adjacent to the terminal edge  14  of the centre arm  10 , while the insertion slot  36  encompasses the terminal edge  14  of the centre arm  10 . Herewith the cable deflecting piece  3  is secured against a removal of the base body  30  from the internal side of the rail foot  18  and against a tilting in Y-direction as well as against a rotation of the cable deflecting piece  3  by engagement of the latching nose  5  into the recess  21  and abutment of the latching edge  51  of the latching nose  5  against the latching edge  22  of the recess  21  as well as of the latching edge  61  of the latching hook  6  against the latching stop  16  of the side arm  11 . 
         [0051]    After inserting the rotary and bearing pin  4  in tilted position of the cable deflecting piece  3  into the rotary and bearing opening  23  on the rail foot  18  a simple pivoting movement of the cable deflecting piece  3  about the mounting rotation axis formed by the rotary and bearing pin  4  as well as the rotary and bearing opening  23  provides a locking of the cable deflecting piece  3  in the mounting final position with a rotarion protection and protection in X-, Y- and Z-direction or protection against a tilting or removal of the base body  30  from the internal side of the rail foot  18  such that the cable forces acting during the operation of the cable window lifter onto the cable deflecting piece  3  can be received steadily without changing the position of the cable deflecting piece  3  in respect to the rail foot  18  of the guide rail  1 . 
         [0052]    In  FIGS. 7 and 8  there are illustrated in isometric views of the internal side of the rail head  17  and in FIGS.  9  and  10 —with schematically transparent illustration of the rail head  17 —there are illustrated in isometric views of the external side of the rail head  17  the mounting of the cable deflecting piece  3  on the rail head  17  in the mounting starting position ( FIGS. 7 and 9 ) as well as in the mounting final position or operating position ( FIGS. 8 and 10 ). 
         [0053]      FIGS. 7 and 9  show in isometric view of the internal side and external side of the rail head  17  of the guide rail  1  the mounting starting position, in which the cable deflecting piece  3  is positioned in a tilted position in respect to the mounting final position on the rail head  17  and the rotary and bearing pin  4  is inserted into the rotary and bearing opening  23 , wherein the inclined surface  80  of the rear grip  8  is directed almost parallel to the chamfer  15  of the terminal edge of the rail head  17  and opposes the latching hook  6  of the internal side of the side arm  11 . 
         [0054]    By pivoting the cable defecting piece  3  about the mounting rotation axis formed by the rotary and bearing pin  4  and the rotary and bearing opening  23  the latching hook  6  is guided along the internal side of the side arm  11  and the latching nose  5  is guided in a circular arc to the recess  21 . Shortly before approaching the mounting final position the inserting slot  36  is moved over the terminal edge  14  of the centre arm  10  until the stop area  31  comes to abutment against the terminal edge  19  of the side arm  12  and edge arm  13  in the mounting final position illustrated in  FIGS. 8 and 10 , the latching nose  4  snaps into the recess  31  and the latching edge  51  of the latch nose  5  abuts against the latching edge  22  of the latching opening  21 . Simultaneously, the latching edge  61  of the latching hook  6  engages via the latching stop  16  at the end of the side arm  11  and secures together with the latching nose  5  the cable deflecting piece  3  against a rotation about the mounting rotation axis. 
         [0055]    Thereby, the strip-like first rear grip  7  comes to an abutment against the section of the external side of the rail head  17  being adjacent to the terminal edge  14  of the centre arm  10  and secures in interaction with the second rear grip  8  the cable deflecting piece in Y-direction as well as the abutment of the base body  30  of the cable deflecting piece  3  against the internal side of the rail head  17 , which is formed by the U-profile of the centre arm  10  and the two side arms  11 ,  12 . 
         [0056]      FIG. 11  shows the mounting final position or operating position of the cable deflecting piece  3  and  FIG. 12  shows an enlarged section of the illustration according to  FIG. 11  with a transparent illustration of the rail head  17  of the guide rail, respectively. 
         [0057]    In the mounting final position the sliding channel  35  of the cable deflecting piece  3  is aligned in longitudinal direction of the guide rail  1 , while the cable channel  33  is directed in an inclined manner away from the rail head  17 . The stop are  31  of the cable deflecting piece  3  abuts against the terminal edges  19  of the side arm  12  and the edge arm  13 . The rotary and bearing pin  4  with its chamfer  40  projects through the rotary and bearing opening  23  and the latching nose  5  serving the rotation protection is snapped in to the recess  21  and abuts against the latching edge  22  of the recess  21  with its latching edge  51 . The first strip-like rear grip  7  encompasses the terminal edge  14  of the centre arm  10  and abuts against the sections of the external and internal side of the centre arm  10  of the rail head  17 , which flank the terminal edge  14 , wherein the inserting slot  36  on the cable deflecting piece  3  receives the terminal edge  14 . 
         [0058]      FIG. 12  shows as a dashed line the chamfer  15  of the rail head  17  encompassed by the second rear grip  8  as well as the inclined edge  80  of the second rear grip  8 , which encompasses diagonally this section of the rail head  17 .

Summary:
A cable deflecting piece, which is fastened on a rail head or rail foot of a guide rail and is intended for a cable operated window lifter, contains a base body which during mounting and following fastening of the cable deflecting piece, abuts against the guide rail on one side of the rail head or rail foot, also contains a rotary and bearing pin, which projects from the base body, can be inserted in a position in which it is tilted in relation to the longitudinal extension of the guide rail, into a rotary and bearing opening of the rail head or rail foot and can be pivoted about a cable deflecting piece, further contains a rotation prevention means which, in a final mounting position, once the cable deflecting piece has been pivoted about the mounting axis of rotation, secures the connection of the cable deflection piece to the rail head or rail foot such that the cable deflecting piece cannot rotate and additionally contains a device which is formed on the basic body and is intended for securing the abutment of the base body against the rail head or rail foot perpendicular to the longitudinal extension of the guide rail.