Abstract:
The invention relates to a wiping device, in particular a wiping device for a motor vehicle pane, comprising a retaining unit ( 10   a - 10   e ) that has a retaining element ( 12   a - 12   e ) with a longitudinal guide channel ( 14   a - 14   e ) for guiding a spring element ( 16   a - 16   e ), and comprising a spoiler unit ( 22   a - 22   e ). According to the invention, the wiping device has at least one undercut ( 18   a - 18   e,    20   a - 20   e ) that is provided in order to interlockingly connect the spoiler unit ( 22   a - 22   e ) to the retaining element ( 12   a - 12   e ) in a wiping direction ( 24   a - 24   e ).

Description:
BACKGROUND OF THE INVENTION 
       [0001]    A wiping device is already known, in particular a wiping device for a motor vehicle pane, comprising a retaining unit which has a retaining element with a longitudinal guide channel for guiding a spring element and comprising a spoiler unit. 
       SUMMARY OF THE INVENTION 
       [0002]    The invention is based on a wiping device, in particular a wiping device for a motor vehicle pane, comprising a retaining unit which has a retaining element with a longitudinal guide channel for guiding a spring element and comprising a spoiler unit. 
         [0003]    It is proposed that the wiping device has at least one undercut which is provided to connect the spoiler unit positively to the retaining element in a wiping direction, whereby a particularly secure coupling of the spoiler unit to the retaining element may be achieved. “Retaining unit” is intended to be understood here in this context, in particular, as a unit which is provided to connect the spoiler unit to a wiper strip. “Retaining element” is intended to be understood here in this context, in particular, as an element which is provided to connect a spoiler unit, a spring element and a wiper strip positively together. “Spring element” is intended to be understood in this context, in particular, as a spring elastic element which has at least one dimension which in a normal operating state is able to be resiliently altered by at least 10%, in particular by at least 20%, preferably by at least 30% and particularly advantageously by at least 50%, and which in particular produces a counter-force which is dependent on an alteration of the dimension and preferably proportional to the alteration, said counter-force counteracting the alteration. “Wiper strip” is intended to be understood in this context as, in particular, a strip which is provided to wipe a vehicle pane. Preferably, the wiper strip is formed from a rubber material. “Longitudinal guide channel” is intended to be understood in this context, in particular, as a guide channel which extends parallel to a longitudinal direction of the retaining unit. Preferably, the longitudinal guide channel comprises a free space as well as at least one channel wall defining the free space. “Longitudinal direction” is intended to be understood in this context, in particular, as a direction which extends substantially parallel to a longitudinal dimension of the retaining element. “Longitudinal dimension” is intended to be understood in this context, in particular, as the greatest possible dimension. “Substantially” is intended to be understood in this context, in particular, as a deviation of less than 10°, preferably less than 5°. A “dimension” of an element is intended to be understood in this context, in particular, as a maximum spacing between two points of a vertical projection of the element on a plane. “Undercut” is intended to be understood in this context, in particular, as a recess and/or depression which has a cross section tapering toward an opening. Preferably, the undercut has a C-shaped cross section. “Wiping direction” is intended to be understood in this context, in particular, as a direction which extends parallel to a surface to be wiped and/or perpendicular to a main orientation of the wiper strip. “Provided” is intended to be understood, in particular, as specifically designed and/or equipped. 
         [0004]    In a further embodiment of the invention, it is proposed that the at least one undercut has a C-shaped contour, whereby forces between the spoiler unit and the retaining element may be transmitted over a particularly large surface area. 
         [0005]    If the wiping device comprises two undercuts which are open in opposing directions, the operational reliability may be further increased. 
         [0006]    It is further proposed that the at least one undercut is arranged inside the retaining element, whereby a particularly flat design of the wiping device may be achieved. 
         [0007]    If the spoiler unit comprises two spoiler components of different hardness, advantageously the weight is able to be reduced and the strength increased. 
         [0008]    It is also proposed that the spoiler component comprises the at least one undercut, whereby the wiping device is able to be configured to be particularly compact in a wiping direction. 
         [0009]    If the spoiler unit comprises a longitudinal channel which has a triangular cross section, material and weight may be advantageously saved. “Triangular” is intended to be understood in this context as a contour which has three corners. The corners may also be rounded, depending on the application. 
         [0010]    If the spoiler unit bears laterally against the retaining element, the wiping device may be protected in a particularly simple manner from the penetration of liquid. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]    Further advantages are revealed from the following description of the drawings. Five exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. The persons skilled in the art will also expediently consider the features individually and combine them to create further useful combinations. 
           [0012]    In the drawings: 
           [0013]      FIG. 1  shows a sectional view of a wiping device comprising a retaining unit, 
           [0014]      FIG. 2  shows a sectional view of a further exemplary embodiment of a wiping device comprising a retaining unit, 
           [0015]      FIG. 3  shows a sectional view of a further exemplary embodiment of a wiping device comprising a retaining unit, 
           [0016]      FIG. 4  shows a sectional view of a further exemplary embodiment of a wiping device comprising a retaining unit and 
           [0017]      FIG. 5  shows a sectional view of a further exemplary embodiment of a wiping device comprising a retaining unit 
       
    
    
     DETAILED DESCRIPTION 
       [0018]      FIG. 1  shows an exemplary embodiment of a wiping device according to the invention comprising a retaining unit  10   a  having a retaining element  12   a  which comprises a longitudinal guide channel  14   a  for guiding a spring element  16   a,  and comprising a spoiler unit  22   a  in a sectional view. The cutting plane extends perpendicular to a longitudinal direction of the retaining element  12   a.    
         [0019]    For guiding the spring element  16   a,  the retaining element  12   a  comprises lateral walls  52   a,    54   a  which adjoin the longitudinal guide channel  14   a.  An intermediate wall  56   a  is also arranged on the lateral walls  52   a,    54   a,  said intermediate wall terminating the longitudinal guide channel  14   a  in the direction of a wiper strip  40   a.  The lateral walls  52   a,    54   a  extend from the intermediate wall  56   a  in a direction opposing the wiper strip  40   a.  A second intermediate wall  72   a  terminates the longitudinal guide channel  14   a  in the direction of the spoiler unit  22   a.  Thus the longitudinal guide channel  14   a  is entirely enclosed. An undercut  18   a,    20   a  is arranged in the lateral walls  52   a,    54   a,  in each case in a lateral region  48   a,    50   a,  said undercut positively connecting the spoiler unit  22   a  to the retaining element  12   a  in a wiping direction  24   a.  The undercuts  18   a,    20   a  have a C-shaped contour. Moreover, the undercuts  18   a,    20   a  have a cross section tapering toward an opening. In this case, the two undercuts  18   a,    20   a  are open in opposing directions. 
         [0020]    A keder track  70   a  which comprises two guide profiles  58   a,    60   a  is arranged on the intermediate wall  56   a.  The guide profiles  58   a,    60   a  are configured integrally with the retaining element  12   a.  The guide profiles  58   a,    60   a  in each case have a vertical wall  62   a,    64   a  and in each case a horizontal wall  66   a,    68   a.  The horizontal walls  66   a,    68   a  respectively enclose with the vertical walls  62   a,    64   a  an acute angle of 77°. The vertical walls  62   a,    64   a  respectively enclose an angle of 90° relative to the intermediate wall  56   a.  The guide profiles  58   a,    60   a  at their free ends of the horizontal walls  66   a,    68   a  face in directions which face one another. 
         [0021]    The intermediate wall  56   a  adjoins the longitudinal guide channel  14   a  of the retaining element  12   a  and comprises two surfaces  42   a,    44   a  which in each case extend parallel to one of the horizontal walls  66   a,    68   a.  The two surfaces  42   a,    44   a  in each case adjoin a third surface  46   a  which is arranged between the surfaces  42   a,    44   a.  The surfaces  42   a,    44   a  in each case enclose an obtuse angle of 167° with the third surface  46   a.    
         [0022]    The spoiler unit  22   a  is produced in an extrusion process. The spoiler unit  22   a  has two spoiler sides  76   a,    78   a  configured in an outwardly concave manner. A connecting web  80   a  which connects the concave spoiler sides  76   a,    78   a  together is provided to reinforce the spoiler unit  22   a . The connecting web  80   a  and the spoiler sides  76   a,    78   a  enclose a longitudinal channel  82   a  which has a substantially triangular cross section. 
         [0023]    The spoiler unit  22   a  is provided for shielding against driving wind. The spoiler unit  22   a  bears laterally against the retaining element  12   a  in the region of the longitudinal guide channel  14   a  in a positive manner. The spoiler unit  22   a  also bears in the region of the longitudinal guide channel  14   a  against one side of the retaining element  12   a  which faces the wiper strip  40   a . The spoiler unit  22   a  thus bears positively in the region of the longitudinal guide channel  14   a  against the retaining element  12   a  and encompasses the longitudinal guide channel  14   a.  In this case, the spoiler unit  22   a  engages in the undercuts  18   a,    20   a  and entirely fills said undercuts. Thus the retaining element  12   a  in the lateral regions  48   a,    50   a  forms a positive connection with the spoiler unit  22   a  acting in the wiping direction  24   a  and in a vertical direction  26   a.    
         [0024]    The retaining element  12   a  is produced in one piece from polyethylene. In this connection, a person skilled in the art will consider different synthetic materials which appear expedient, such as for example polypropylene, polyamide, polyvinylchloride and/or polystyrene. 
         [0025]    The spring element  16   a  is incorporated in the longitudinal guide channel  14   a.  The spring element  16   a  is produced from a spring steel and is provided to configure the retaining unit  10   a  to be elastically deflectable. 
         [0026]    For assembly, the spring element  16   a  is initially inserted into the longitudinal guide channel  14   a.  Subsequently, the wiper strip  40   a  is pushed into the keder track  70   a  and forms a positive connection with the retaining element  12   a.  The spoiler unit  22   a  is now pushed over the retaining element  12   a  and is then positively connected thereto. 
         [0027]    In  FIGS. 2 to 5  four further exemplary embodiments of the invention are shown. The following descriptions are substantially limited to the differences between the exemplary embodiments, wherein reference may be made to the description of the first exemplary embodiment relative to components, features and functions which remain the same. To differentiate between the exemplary embodiments, the letter a in the reference numerals of the exemplary embodiment in  FIG. 1  is replaced by the letters b to e in the reference numerals of the exemplary embodiments of  FIGS. 2 to 5 . Relative to components which are identified as the same, in particular relative to components with the same reference numerals, in principle reference may also be made to the drawings and/or the description of the first exemplary embodiment. 
         [0028]      FIG. 2  shows a further exemplary embodiment of a wiping device according to the invention comprising a retaining unit  10   b  having a retaining element  12   b  which has a longitudinal guide channel  14   b  for guiding a spring element  16   b,  as well as a spoiler unit  22   b  in a sectional view. The sectional plane extends perpendicular to a longitudinal direction of the retaining element  12   b.  The wiping device corresponds substantially to the exemplary embodiment shown in  FIG. 1 . 
         [0029]    In one respective lateral region  48   b,    50   b,  the retaining element  12   b  and the spoiler unit  22   b  have a surface  28   b,    30   b  which extends parallel to a horizontal wall  66   b,    68   b  of a keder track  70   b  of the retaining element  12   b.  The surface  28   b,    30   b  respectively encloses an angle of 13° with a wiping direction  24   b.    
         [0030]      FIG. 3  shows a further exemplary embodiment of a wiping device according to the invention, comprising a retaining unit  10   c  having a retaining element  12   c,  which has a longitudinal guide channel  14   c  for guiding a spring element  16   c,  as well as a spoiler unit  22   c  in a sectional view. The cutting plane extends perpendicular to a longitudinal direction of the retaining element  12   c.  The wiping device corresponds substantially to the exemplary embodiment shown in  FIG. 2 . 
         [0031]    In one respective lateral region  48   c,    50   c,  the retaining element  12   c  has a surface  28   c ,  30   c  which extends parallel to a horizontal wall  66   c,    68   c  of a keder track  70   c  of the retaining element  12   c.  The surface  28   c,    30   c  respectively encloses an angle of 13° with a wiping direction  24   c.    
         [0032]    The spoiler unit  22   c  in the region of the longitudinal guide channel  14   c  bears against one side of the retaining element  12   c  which faces a wiper strip  40   c.  In this case, the spoiler unit  22   c  also positively bears against the surfaces  28   c,    30   c  of the retaining element  12   c.  The spoiler unit  22   c  also bears against vertical walls  62   c,    64   c  of the keder track  70   c.  A connecting web  80   c  is partially incorporated in a recess  74   c  of a second intermediate wall  72   c  and thus forms with the second intermediate wall  72   c  a positive connection acting in a wiping direction  24   c.    
         [0033]      FIG. 4  shows a further exemplary embodiment of a wiping device according to the invention, comprising a retaining unit  10   d  having a retaining element  12   d  which has a longitudinal guide channel  14   d  for guiding a spring element  16   d,  in a sectional view. The cutting plane extends perpendicular to a longitudinal direction of the retaining element  12   d.    
         [0034]    The retaining element  12   d  has two fastening elements  86   d,    88   d.  The fastening elements  86   d,    88   d  are integrally formed with the retaining element  12   d.  The fastening elements  86   d,    88   d  at their free ends face in directions facing one another. Moreover, the fastening elements  86   d,    88   d  form two channel walls  36   d,    38   d  which adjoin the longitudinal guide channel  14   d  on a side remote from the wiper strip. The fastening elements  86   d,    88   d  are configured in the region of their free ends in the form of a keder track. The ends are encompassed by a spoiler unit  22   d.  To this end, the spoiler unit  22   d  has two undercuts  18   d,    20   d  into which the fastening elements  86   d,    88   d  engage. The undercuts  18   d,    20   d  have in each case a C-shaped contour and are open in opposing directions. The undercuts  18   d,    20   d  thus connect the spoiler unit  22   d  positively to the retaining element  12   d  in a wiping direction  24   d.    
         [0035]    To guide the spring element  16   d,  lateral walls  52   d,    54   d  of the longitudinal guide channel  14   d  adjoin the channel walls  36   d,    38   d.  The channel walls  36   d,    38   d  in this case enclose a right angle with the lateral walls  52   d,    54   d.  Moreover, an intermediate wall  56   d  is arranged on the lateral walls  52   d,    54   d,  said intermediate wall terminating the longitudinal guide channel  14   d  in the direction of a wiper strip  40   d.  The lateral walls  52   d,    54   d  extend from the intermediate wall  56   d  in a direction opposing the wiper strip  40   d.  The retaining element  12   d  has a longitudinal opening  84   d  which opens the longitudinal guide channel  14   d  toward the spoiler unit  22   d.    
         [0036]    Two L-shaped guide profiles  58   d,    60   d  of the retaining unit  10   d  are arranged on the intermediate wall  56   d.  The guide profiles  58   d,    60   d  are integrally formed with the retaining element  12   d.  The guide profiles  58   d,    60   d  have in each case a vertical wall  62   d,    64   d  and in each case a horizontal wall  66   d,    68   d.  The horizontal walls  66   d,    68   d  respectively enclose an angle of 90° with the vertical walls  62   d,    64   d.  In this case, the horizontal walls  66   d,    68   d  face one another. The vertical walls  62   d,    64   d  respectively enclose an angle of 90° relative to the intermediate wall  56   d.  The guide profiles  58   d,    60   d  at their free ends of the horizontal walls  66   d,    68   d  face in directions facing one another. The guide profiles  58   d,    60   d  and the intermediate wall  56   d  form the keder track  70   d  into which the wiper strip  40   d  is inserted. 
         [0037]    The retaining element  12   d  is produced in one piece from polyethylene in an extrusion process. In this connection, a person skilled in the art will consider different synthetic materials which may be expedient, such as in particular polypropylene, polyamide, polyvinylchloride and/or polystyrene. 
         [0038]    The spoiler unit  22   d  is produced in a co-extrusion process from two spoiler components  32   d,    34   d,    90   d  of different hardness. The first spoiler component  32   d  has two spoiler sides  76   d,    78   d  configured in an outwardly concave manner. The more flexible spoiler component  32   d  and the harder spoiler components  34   d,    90   d  are connected together by a material connection and in a planar manner. To reinforce the spoiler unit  22   d,  the first spoiler component  32   d  has a connecting web  80   d  which connects together the concave spoiler sides  76   d,    78   d.  The more flexible spoiler component  32   d  encloses a longitudinal channel  82   d  which has a five-sided cross section. The harder spoiler components  34   d,    90   d  in each case comprise one of the undercuts  18   d ,  20   d.    
         [0039]    The first spoiler component  32   d  is integrally formed with the spoiler components  34   d,    90   d  and is provided for deflecting driving wind. The spoiler components  34   d,    90   d  have a greater strength and hardness than the first spoiler component  32   d.  The spoiler components  34   d ,  90   d  are configured separately from one another. The spoiler component  34   d  forms the fastening elements  86   d,    88   d.  The fastening elements  86   d,    88   d  are of circular shape and bear positively against the spoiler components  34   d,    90   d.    
         [0040]    The spring element  16   d  is produced from a spring steel and provided to configure the retaining unit  10   d  to be elastically deflectable. For assembly, the spring element  16   d  is initially inserted into the longitudinal guide channel  14   d.  Subsequently, the wiper strip  40   d  is pushed into the keder track  70   d  and forms a positive connection with the retaining element  12   d.  The spoiler unit  22   d  is now pushed over the fastening elements  86   d,    88   d  and is then positively connected thereto. 
         [0041]      FIG. 5  shows a further exemplary embodiment of a wiping device according to the invention, comprising a retaining unit  10   e  having a retaining element  12   e  which has a longitudinal guide channel  14   e  for guiding a spring element  16   e  in a sectional view. The cutting plane extends perpendicular to a longitudinal direction of the retaining element  12   e.  The wiping device shown corresponds substantially to the exemplary embodiment shown in  FIG. 4 . 
         [0042]    The retaining element  12   e  has two fastening elements  86   e,    88   e.  The fastening elements  86   e,    88   e  are integrally formed with the retaining element  12   e.  The fastening elements  86   e,    88   e  at their free ends face in directions facing one another. Moreover, the fastening elements  86   e,    88   e  form two channel walls  36   e,    38   e  which adjoin the longitudinal guide channel  14   e  on a side remote from the wiper strip. The fastening elements  86   e,    88   e  are configured in the form of a keder track in the region of their free ends. The ends are encompassed by a spoiler unit  22   e.  To this end, the spoiler unit  22   e  has two undercuts  18   e,    20   e  in which the fastening elements  86   e,    88   e  engage. The undercuts  18   e,    20   e  have in each case a C-shaped contour and are open in opposing directions. The undercuts  18   e,    20   e  thus connect the spoiler unit  22   e  positively to the retaining element  12   e  in a wiping direction  24   e.    
         [0043]    The spoiler unit  22   e  has two fastening elements  86   e,    88   e.  In each case, the fastening elements  86   e,    88   e  form a C-shaped receiving region and thus a keder track  70   e.  The fastening elements  86   e,    88   e  are connected together via a stabilizing web  92   e.  The stabilizing web  92   e  consists of the same material as the fastening elements  86   e,    88   e  and is integrally formed therewith. Moreover, the fastening elements  86   e,    88   e  are formed integrally with a connecting web  80   e,  wherein the connecting web  80   e  connects together two spoiler sides  76   e,    78   e  of the spoiler unit  22   e.