DE10122764A1 - Vehicle window wiper has a connector at the wiper blade, with a structured recess, to take a rotating sleeve at the wiper arm mounting to give a low-wear assembly - Google Patents

Abstract

The wiper, and especially for vehicle windows, has a powered wiper arm (10) which carries a wiper blade (12) with a wiper rubber (14) and a wiper lip (18) towards the window glass. Two spring rail strips (20) hold the wiper rubber, with a coupled connector (24) on the side away from the window, with a recess (26) to take the wiper arm mounting. The mounting has a rotating sleeve (28), with a surface contour towards the recess which is at least partially complementary to the recess surface contour.

Description

The invention relates to a wiper device, in particular for Wiping vehicle windows, with a drivable wiper arm, with a flat wiper blade that can be arranged on the wiper arm and which a squeegee with one facing the window to be wiped Wiper lip, two band-like receiving the squeegee elongated spring rails and one with the spring rails Coupled connecting element, wherein the Connecting element in a direction facing away from the disc has open recess for receiving at least one located at the free end of the wiper arm Bearing element is provided. The bearing element is special than connected to the wiper arm in a rotationally fixed manner, largely parallel to the disc and largely transverse to the longitudinal axis of the Flat wiper blade trained bearing pin. Further can be arranged on the free end of the wiper arm journal form the bearing element.

In a wiper device described ensure the band-like, elongated spring rails an optimal Distribution of the wiper blade contact force emanating from the wiper arm to the pane. The spring rails are in the unloaded Condition, so if the wiper blade is not on the window, pre-bent accordingly and have a u. a. from the curvature depending on the curvature to be wiped. The Spring rails thus replace the complex Support bracket construction, such as from the DE 15 05 397 has become known.

Generic wiping devices are from DE 199 07 629 A1 known. A disadvantage of such wiping devices is that Contact corrosion between the bearing element and the Connecting element can occur in the area of the recess. A selection of materials, although the one on the bearing acting loads can be an additional Bring contact corrosion. The touching, bearing parts moved relative to one another are also subject to one high wear.

The present invention is therefore based on the object to provide a wiping device, the said Remedies disadvantages of the known prior art.

This task is the beginning of a wiper device described type according to the invention solved in that a the bearing element rotatably mounted sleeve member is, the surface contour of the recess facing the Sleeve element complementary to that at least in sections Surface contour of the recess is formed.

This has the advantage that the pivoting movement of the Flat wiper blade opposite the wiper arm within one defined storage between the sleeve element and the preferably pin-shaped bearing element. The Material of the sleeve element is advantageously chosen so that it meets the requirements for a bearing material and also for reasons of corrosion, the separation of the bearing element and the Connection element serves. It is also possible to Reduction of wear and friction which are relative lubricate bearing surfaces moving towards each other.

In an advantageous embodiment of the invention, the Surface contour of the sleeve element in the axial direction of the sleeve element extending circular cross-section. This has the advantage that the sleeve element in each any position in the corresponding complementary training Recess can be inserted. A faulty one, too Malfunctions of the wiper device leading assembly therefore excluded.

In a further advantageous embodiment of the invention it is provided that the surface contour of the sleeve element at least in sections has an area which compared to a complementary surface contour of the recess is designed to prevent rotation. This will first Line prevented that an undesirable rotational movement between the connecting element and the sleeve element takes place. It is ensured that when swiveling of the flat wiper blade opposite the wiper arm Relative movement only between those for this provided components takes place. This contributes to one longer life of the wiper.

The surface contour of the Sleeve element additionally at least in sections Area on that self-finding in a complementary Surface contour of the recess is formed. hereby it is ensured that incorrect assembly or joining of the wiper arm with the flat wiper blade is excluded. Rather, it ensures that the sleeve element automatically comes into the intended position in the recess.

Such a rotation-inhibiting and / or self-finding Area of the surface contour of the sleeve member has in particular an elliptical, triangular or trapezoidal cross-section. According to the respective Cross section or the respective area of the sleeve element the surface contour of the recess complementary to this educated. Have been particularly advantageous Refinements of the sleeve element proved in which the Force curve between flat wiper blade and wiper arm over level Surfaces. As a result, high material loads, such as they are avoided, for example, with line loads. Trapezoidal cross sections are particularly suitable for the Realization of such area loads. The use of triangular or trapezoidal cross sections also has the Advantage that manufacturing tolerances due to the wedge-like adding components can be compensated.

According to the invention it is also conceivable that between the Bearing element and the sleeve element bearing means for improvement the quality of the storage can be provided. such Storage means can, for example, on the two each other facing away openings of the sleeve member arranged rotatably Be bearing ring elements. The use of such storage means has the advantage that materials without Taking into account the material of the sleeve element, and vice versa, can be used. The use of the additional storage means leads to a larger one Material selection of bearing element and sleeve element. Further can be a sealed bearing with less friction and better dry running properties can be realized.

The arrangement of the flat wiper blade on the wiper arm can be provided according to the invention that the wiper device Locking unit comprises, by means of which the open Recess of the connecting element on the disc opposite side is closable. After that on the free End of the wiper arm arranged sleeve element for connecting the Wiper arm with the flat wiper blade in the recess of the Connection element is given, such Locking unit the flat wiper blade on the wiper arm be kept permanently pivotable.

The locking element advantageously surrounds the Connection element largely. This has the advantage that Connecting element with associated bearing point Environmental influences is protected. In particular, it prevents that contaminants accumulate, leading to a Deterioration of the pivotability of the flat wiper blade towards the wiper arm and thus to a deterioration of the Wipe quality can lead.

Advantageously, can also be provided according to the invention be that the locking unit is the connecting element has lateral and / or rear-engaging guide bars, the with existing guide grooves on the connecting element interact. About such guide grooves that advantageously largely parallel to The longitudinal direction of the wiper blade can run Locking unit pushed onto the connecting element become.

In addition, the side of the recess facing the Locking unit can be designed such that the The sleeve element can be held in the recess largely without play is. This ensures that wobbling or tipping of the sleeve element in the recess can not take place. In particular, a tilting of the wiper blade relative to the wiper arm and around its longitudinal axis would diminish Wiping quality, noise and increased wear to lead.

For improved and more reliable mounting of the Sleeve element in the recess can be according to the invention be provided that the locking unit on the Recess facing side comprises a spring element, which is suitable for that which can be arranged in the recess To apply a spring force to the sleeve element. Through the Actuation of the sleeve element in the direction of Disc acting spring force is a play-free arrangement of the Sleeve element guaranteed in the recess.

To ensure that the locking unit in its Assembly position remains, can be provided according to the invention, that the spring element on the sleeve element facing Side has at least one resilient elevation, with a recess arranged on the sleeve element interacts. When the assembly position is reached, the Elevation into the deepening. Around the locking unit the mounting position or the elevation from the recess increased effort is necessary.

Another development of the invention provides that at the Locking unit or on the locking unit a spring means belonging to the spring element is provided, which is temporarily provided with one on the connecting element Counterstop interacts to prevent unwanted removal the locking unit from the connecting element prevent. This is particularly easy realizable that the on the locking unit anyway existing spring tongue temporarily the function of the lifting gear and an existing ramp on the connecting element Function of the counter-slinging device takes over.

Another embodiment of the invention provides that at the Locking unit or on the locking unit belonging spring element, a locking means is provided, which temporarily with one provided on the connecting element Counter-locking means cooperates to the locking unit in a period in which the flat wiper blade is not on Wiper arm is mounted in the open position on Lock connecting element. This brings measures in particular an easier assembly because the Locking unit not before joining the wiper arm and the flat wiper blade is only brought into the open position must become.

In connection with the measure described above it is advantageous to use the locking unit anyway existing spring tongue temporarily the function of the locking means and a locking recess formed on the connecting element The function of the counter locking means takes over. The recess is preferably immediately in the area of Connection element is arranged, which, in the longitudinal direction seen the flat wiper blade, to the middle of the Connecting element facing side of the connecting element connects the existing ramp.

It can further be provided according to the invention that the Spring element encompassing and engaging behind the connecting element Has guide webs with the connecting element existing spring grooves interact. This will be a safe guidance of the locking unit over the spring element guaranteed against the connecting element.

In another embodiment of the invention provided that a protrusion or a recess is arranged with one on the free End of the wiper arm arranged recess or a protrusion to limit the swivel angle of the flat wiper blade compared to Interacts with the wiper arm. This in particular avoids that by swiveling the flat wiper blade Loosen the flat wiper blade by moving the Locking unit can be done from the mounting position. It also prevents the wiper from being improper can be folded onto the pane in such a way that not that Squeegee, but one end of the flat wiper blade or one at End of the flat wiper blade attached cover cap or the Wiper lip facing away from the flat wiper blade against the Disc hits.

According to the invention, it is advantageously provided that the Overhang or the recess on the wiper blade facing side below the sleeve member on the wiper arm is arranged.

The task mentioned above is also by an im The previously described flat wiper blade and a solved in the wiper arm described above.

Further advantageous refinements and details of Invention can be found in the following description in which the invention with reference to that shown in the drawing Exemplary embodiments are described and explained in more detail. Show it:

Fig. 1 shows a wiper device according to the invention in exploded view;

Fig. 2-5 different connection options according to the invention of the wiper blade to the wiper arm;

FIG. 6 shows an enlarged detail from FIG. 1;

Fig. 7a-c, different views of the wiper arm on the wiper arm or assembled and

Fig. 8a-c, different pivot positions of the wiper blade on the wiper arm.

Fig. 1 shows a wiper device according to the invention with a drivable wiper arm 10 and on the wiper arm 10 pivoted at least conditionally can be arranged flat wiper blade 12. The flat wiper blade 12 comprises a wiper rubber 14 with a wiper lip 16 facing the window to be wiped. On the side facing away from the wiper lip 16, the wiper rubber 14 has a spoiler-like attachment 18 . The wiper blade 12 further comprises two strip-like elongate spring rails 20 and two for the arrangement at the free ends of the spring rail 20 and the wiper rubber 14 provided for covering caps 22nd The flat wiper blade 12 also provides a connecting element 24 , which holds the two spring rails 20 in the assembled state. The connecting element 24 has a recess 26 which is open in the direction facing away from the pane. In the assembled state of the wiper device, the recess 26 serves to receive a sleeve element 28 which is rotatably mounted on the wiper arm 10 . The wiper device also has a locking unit 30 , which is provided for locking the sleeve element 28 in the recess 26 . Between the locking element 30 and the sleeve element 28 , a spring element 32 is provided on the locking element 30 , which is preferably made of a spring metal material.

Figs. 2-5 show various kinds of embodiment of the connection of the connecting member 24 to the wiper arm 10. The free end of the wiper arm 10 facing the flat wiper blade 12 is shown . In the end region, the wiper arm 10 has two tabs 34 or side walls which are arranged parallel to one another and extend in the longitudinal direction of the wiper arm. The two tabs 34 or side walls each have a through hole 36 . The two through holes 36 lie in a line that runs largely parallel to the window and largely transverse to the longitudinal direction of the flat wiper blade 12 . The two through holes 36 are provided for receiving a bearing pin 38 . The bearing pin 38 is advantageously pressed or caulked with the wiper arm 10 for a rotationally fixed arrangement. It would also be conceivable to provide 34 bearing pins on the mutually facing sides of the two tabs instead of a continuous bearing pin 38 . The bearing pins could advantageously be formed in one piece with the free end of the wiper arm 10 .

Furthermore, in FIGS . 2-5 the bearing pin 38 or the bearing journal serves to receive the sleeve element designated by the reference number 28 a, 28 b, 28 c, and 28. The sleeve element 28 a, 28 b, 28c, and 28 is rotatably arranged relative to the bearing pin 38 . It provides a through hole 44 for receiving the bearing pin 38 .

The distance between the two tabs 34 or side walls is slightly larger than the width of the connecting element 24 a, 24 b, 24 c and 24 . The two mutually facing sides of the tabs 34 can therefore advantageously serve in connection with the opposite longitudinal sides of the connecting element 24 a, 24 b, 24 c and 24 as contact and sliding surfaces during the wiping process or during a pivoting of the flat wiper blade 12 relative to the wiper arm 10 , No other means of guidance are required.

With regard to FIG. 2, the sleeve element 28 a has a circular surface contour that does not change in the axial direction of the sleeve element 28 a. In the assembled state of the wiper device, the sleeve element 28 a is arranged in the recess 26 a of the connecting element 24 a. The U-shaped recess 26 a extends transversely to the longitudinal axis of the flat wiper blade 12 , has two parallel or largely parallel side walls 40 and a semicircular base 42 . The surface contour of the sleeve element 28 a facing the recess 26 a is complementary to the surface contour of the recess 26 a, in particular to the surface contour of the base 42 of the recess 26 a.

The embodiment shown in FIG. 2 has the advantage that there is a pivoting movement between the flat wiper blade 12 or its connecting element 24 a and the wiper arm 10 between the sleeve element 28 a and the bearing pin 38 . For the sleeve element 28 a, a material is advantageously chosen that meets the requirements of a bearing material and also serves to separate the bearing pin 38 and the connecting element 24 a for reasons of corrosion. Lubrication is conceivable to reduce wear and friction between the bearing pin 38 and the sleeve element 28 a. In addition, due to the circular outer contour of the sleeve element 28 can be inserted in any position in the recess 26 a of the connecting member 24 a a of this.

The embodiments shown in FIGS . 3 to 5 differ from the embodiment shown in FIG. 2 by specially designed sleeve elements 28 b, 28 c and 28 and the associated recess 26 b, 26 c and 26 .

The sleeve member 28 b according to Fig. 3, an area 46 which is substantially elliptically shaped in cross section. The recess 26 b of the connecting member 24 b provides a 28 b complementary, for the positive reception of the sleeve member 28 b proper range 48 prior to the region 46 of the sleeve member. In the assembled state, the interaction of the areas 46 and 48 prevents the sleeve element 28 b from rotating relative to the connecting element 24 b. As a result, the sleeve element 28 b is prevented from rotating relative to the connecting element 24 b.

In the embodiment according to FIG. 4, a sleeve element 28 c is used which has a trapezoidal cross section. The recess 26 c of the connecting element 24 c has wedge-shaped side walls 40 tapering in the direction of the disk. The angle at which the side walls 40 converge corresponds to the angle at which the two sides 50 of the sleeve element 28 facing away from each other converge. In the assembled state, the sleeve element 28 c is accordingly arranged according to a wedge in the recess 26 of the connecting element 24 c.

In contrast to the embodiments according to FIGS. 2 and 3, the embodiment according to FIG. 4 has the advantage that forces acting between the wiper arm 10 and the connecting element 24 are transmitted via the adjoining surfaces 50 and 40 . Due to the uniform distribution of the acting loads over the surfaces 50 and 40 , the formation of stress peaks on the adjacent components is avoided. In the embodiments according to FIGS. 2 and 3 occur in practice relatively high due to the round surface contours of the sleeve elements 28 a and 28 b and the complementary trained, with the surface contours of the sleeve elements 28 a and 28 b recesses 26 a and 26 b Line loads. These line loads lead to faster wear of the components in comparison with the embodiment according to FIGS. 4 and 5. The service life of the wiper device is accordingly reduced. The sleeve elements 28 , 28 a, 28 b and 28 c have the advantage that they are designed in such a way that they interact with the complementary surface contour of the respective recess in the connecting element. When the rotatably mounted sleeve element 28 , 28 a, 28 b and 28 c is inserted into the corresponding recess 26 , 26 a, 26 b and 26 c, the sleeve element 28 , 28 a, 28 b and 28 c automatically rotates into the intended mounting position. This prevents incorrect assembly from occurring. For the embodiments according to FIGS. 4 and 5, however, the self-determination of the mounting position can only take place if the sleeve element 28 or 28 c is not rotated too much relative to the mounting position.

Fig. 5 shows the embodiment of the invention acc. Fig. 1 enlarged, are provided in the bearing means 52 to improve the quality of the storage of the sleeve member 28 relative to the bearing pin 38 . The bearing means 52 are designed as bearing ring elements which are arranged in a rotationally fixed manner at the two openings of the through hole 44 of the sleeve element 28 facing away from one another. The sleeve element 28 is rotated relative to the bearing pin 38 by a relative movement between the bearing pin 38 and the bearing means 52 . This can advantageously be used for the bearing pin 38 as well as for the sleeve element 28, a material that meets the requirements of the circumstances. In particular, the storage can also be sealed by the storage means. The friction is reduced and the dry running properties of the bearing point are improved. The bearing point is also less sensitive to dirt.

The sleeve element 28 according to FIG. 5 essentially corresponds to the sleeve element 28 c according to FIG. 4. It has a special design on its upper side, which is described in the description of FIGS. 6 and 7.

In FIG. 6, the free end of the wiper arm 10 is shown in assembled state. The bearing pin 38 is arranged in a rotationally fixed manner in the through holes 36 . Furthermore, the sleeve element 28 comprises the two bearing means 52 shown in FIG. 5, which interact with the bearing pin 38 .

On its upper side, the sleeve element 28 provides a depression 54 in the central region. A bevel 56 is provided in front of and behind the depression 54 , in the longitudinal direction of the wiper blade. The bevel 56 extends from the top of the sleeve element 28 at a flat angle to the mutually opposite sides 50.

The connecting element 24 provides on its upper side four webs 58 and 60 which extend in the longitudinal direction of the wiper blade and each have an L-shaped cross section. The two webs 58 and the two webs 60 are each arranged along a line. In addition, the webs 58 lie opposite the webs 60 . The webs 58 and 60 form two groove-shaped recesses 62 , which are open at the top and lie along a line, on the upper side of the connecting element 24 .

The webs 58 and 60 furthermore form guide grooves 64 which extend in the longitudinal direction of the wiper blade and are arranged on the opposite longitudinal sides of the connecting element 24 .

The locking unit 30 , or the spring element 32 belonging to the locking unit 30 , can be displaced along the guide grooves 64 with respect to the connecting element 24 . For this purpose, the spring element 32 , which is of a flat design, has guide webs 68 bent at its longitudinal edges by 180 ° in the direction of the connecting element 24 . In the assembled state, the guide webs 68 encompass the webs 58 and 60 of the connecting element 24 , the free longitudinal edges of the guide webs 68 , as can be seen in FIGS. 7a to 7c, engage in the guide grooves 64 of the connecting element 24 .

The locking element 30 provides two longitudinally extending side walls 70 , an end wall 72 and an upper wall 74 . The end wall 72 has a recess 76 corresponding to the contour of the spoiler-like extension 18 of the wiper rubber 14 . In the assembled state, the spring element 32 is fastened to the inside of the upper wall 74 of the locking unit 30 . For fastening to the upper wall 74 , the spring element 32 has a cutout 78 in the region of its central longitudinal axis . This can be designed such that it bites off with a protrusion formed on the inside of the upper wall 74 .

The spring element 32 also sees on its underside two spring lugs 80 which extend downwards, in the assembled state in the direction of the sleeve element 28 . The spring lugs 80 are designed in the form of bulges in the sections of the guide webs 68 bent by 180 °.

This spring tabs 80, the acted upon in the assembled state in the recess 26 exploiting Dende sleeve member 28 having a spring force which press the sleeve member 28 in the wedge-like recess 26th The spring lugs 80 act on the surfaces of the upper side of the sleeve element 28 which are provided with the reference numeral 82 in FIG. 6.

The spring element 32 provides a spring tongue 84 in its central region, which extends transversely to the longitudinal direction of the flat wiper blade 12 along a line with the two spring lugs 80 . In the assembled state, the spring tongue 84 engages in the recess 54 of the sleeve element 28 , as shown in FIG. 7c.

To assemble the wiper device, the sleeve element 28 , which is arranged at the free end of the wiper arm 10 , is inserted into the recess 26 . To hold the wiper blade on the wiper arm, the locking unit 30 with the spring element 32 , as shown in FIG. 7 a, is pushed onto the connecting element 24 in the longitudinal direction of the flat wiper blade 12 . As already mentioned, the guide webs 68 of the spring element 32 engage in the guide grooves 64 of the connecting element 24 . When the locking unit 30 is pushed onto the connecting element 24 , the spring tongue 84 is raised via a ramp 86 and reaches the groove-like recess 62 located behind the ramp 86 ( FIG. 6). The spring element 32 or the locking unit 30 is further caught due to the spring tongue 84 located in the groove 62 . The spring tongue 84 may thus temporarily work as a counter-abutment means and in cooperation with the side facing the center of the connecting element 24 side of the ramp 86 which functions as a stop means, or prevent the release of the locking unit 30 of the belonging to it spring element 32 of the connecting element 24th This sliding could otherwise take place in particular if the locking unit is moved into its open position. In this state, the flat wiper blade 12 including the connecting element and the locking unit 30 with the spring element 32 form a structural unit. A release of the locking unit 30 from the connecting element 24 is, if at all, only possible with increased effort, in which the spring tongue 84 is lifted out of the groove 62 .

In the area directly adjoining the inside of the ramp 86 pointing in the direction of the center of the connecting element 24 , a latching recess 96 is incorporated, which can latch the spring tongue 84 in the open position. This makes it possible to temporarily lock the locking unit 30 in its open position. This is advantageous for the process of mounting the flat wiper blade 12 on the wiper arm 10 . In this way, a prerequisite for mechanical assembly could also be created. Installation is also easier if the wiper arm-wiper blade connection is only made by the vehicle manufacturer. The flat wiper blades can thus be delivered with the locking unit in the open position.

For the final assembly, the locking unit 30 is pushed towards the end of the wiper arm in the longitudinal direction of the flat wiper blade 12 until the spring tongue 84 snaps into the depression 54 via the bevel 56 arranged on the sleeve element 28 . In this assembly position, the two spring lugs 80 apply the respective spring force to the sleeve element 28 at the two areas 82 . The sleeve element 28 is thus held in the recess 26 via the spring force of the spring lugs 80 , as shown in FIG. 7c.

The application of a spring force to the sleeve element 28 has the advantage that the sleeve element 28 can be supported in the recess 26 of the connecting element 24 without play. Manufacturing tolerances that occur, which can result in the sleeve element 28 engaging in the recess 26 to a different depth, can be compensated for in this way. In addition, forces are transmitted between the connecting element 24 and the sleeve element 28 via the spring lugs 80 or the spring element 32 . The two symmetrically arranged spring lugs 80 in particular prevent the wiper blade 12 from tilting relative to the wiper arm 10 about its longitudinal axis. The occurrence of tilting movements would result in reduced wiping quality, noise and increased wear. During operation of the wiper device, the spring tongue 84 engaging in the recess 54 ensures that the locking unit 30 does not automatically move out of its locking position, as shown in FIG. 7c.

To release the flat wiper blade 12 of the wiper arm 10, the locking unit 30 is shifted after the wiper arm 10 opposite side in the longitudinal direction of the flat wiper blade. For this purpose, an increased unlocking force is initially required, through which the spring tongue 84 is guided out of the depression 54 .

As can be clearly seen from FIGS. 8a to 8c, the connecting element 24 has a defined projection 88 on its longitudinal sides facing away from one another. The projection 88 interacts with a recess 90 provided on at least one of the two tabs 34 or side walls of the wiper arm 10 , the recess 90 being arranged on the side of the tabs 34 or side walls facing the window. In the assembled state, the supernatant 88 engages in the recess 90 and engage the projections 88 in the recesses 90 a. The recesses 90 are delimited by two opposite edges 92 and 94 . The projection 80 interacts with the recess 90 or with the two edges 92 and 94 to limit the pivoting angle of the flat wiper blade 12 relative to the wiper arm 10 . Limiting the swivel angle has the advantage that overtightening of the bearing between the wiper arm and flat wiper blade 12 is prevented. Such over-tightening could otherwise result in the wiper arm 10 pushing the locking unit 30 out of its locked position, shown in FIG. 7c, so that the locking unit is opened unintentionally and possibly unnoticed. The limitation of the swivel angle also prevents the wiper device from accidentally folding back onto the window from a position folded down from the window, for example for performing a manual window cleaning, in such a way that it is not the wiper rubber 14 with the wiper lip 16 but one end of the flat wiper blade 12 or a cover cap 22 attached to the end of the flat wiper blade 12 or the side of the flat wiper blade 12 facing away from the wiper lip 16 strikes the window. This could damage the windscreen or the flat wiper blade.

In Fig. 8a is a neutral central position of the flat wiper blade 12 is shown in relation to the wiper arm 10. An extreme position is shown in FIG. 8 b, in which the projection 88 strikes the edge 92 of the recess 90 . A further pivoting of the flat wiper blade 12 around the bearing pin 38 is accordingly prevented. In Fig. 8c, the other extreme position of the wiper arm 10 is shown in relation to the flat wiper blade 12. Further pivoting of the flat wiper blade 12 is prevented due to the protrusion of the projection 88 on the edge 94 of the recess 90 .

All in the description, the following claims and the Features shown can be drawn individually, as well also essential to the invention in any combination with one another his.

Claims (22)

1. wiper device, particularly for wiping vehicle windscreens, comprising a drivable wiper arm (10) and with a on the wiper arm (10) which can be arranged flat wiper blade (12) having a wiper rubber (14) with one of the facing to be wiped the wiper lip (16), two squeegee (14) comprises receiving, band-like elongate spring rails (20) and a coupled with the spring rails (20) connecting element (24), wherein the connecting element (24) in the side remote from the slice direction open recess (26) for receiving has at least one bearing element ( 38 ) arranged on the free end of a wiper arm ( 10 ), characterized in that a rotatably mounted sleeve element ( 28 , 28 a, 28 b, 28 c) is arranged on the bearing element ( 38 ), the The surface contour of the sleeve element ( 28 , 28 a, 28 b, 28 c) facing the recess is complementary to the surface contour of the recess ( 26 , 26 a, 26 b, 26 c) is formed. 2. The wiper device according to claim 1, characterized in that the surface contour of the sleeve element (28 a) includes a (28 a) has circular cross-section extending in the axial direction of the sleeve member. 3. Wiper device according to claim 1 or 2, characterized in that the surface contour of the sleeve element ( 28 , 28 b, 28 c) at least in sections has an area ( 46 ) which is opposite a complementary surface contour of the recess ( 26 , 26 b, 26 c ) is designed to prevent rotation. 4. Wiper device according to claim 1 or 3, characterized in that the surface contour of the sleeve element ( 28 , 28 b, 28 c) at least in sections has an area ( 46 ) which is self-finding in a complementary surface contour of the recess ( 26 , 26 b, 26 c) is trained. 5. Wiper device according to claim 3 or 4, characterized in that the rotation-inhibiting and / or self-finding area of the surface contour of the sleeve element ( 28 , 28 b, 28 c) in particular has an elliptical, triangular or trapezoidal cross section and that the surface contour of the recess ( 26 , 26 b, 26 c) is complementary to this. 6. Wiper device according to one of the preceding claims, characterized in that between the bearing element ( 38 ) and the sleeve element ( 28 ) bearing means ( 52 ) are provided to improve the quality of the storage. 7. Wiper device according to claim 6, characterized in that the bearing means ( 52 ) comprise rotatably arranged bearing ring elements at the two mutually facing openings of the sleeve element ( 28 ). 8. Wiper device according to one of the preceding claims, characterized in that the wiper device comprises a locking unit ( 30 ), via which to arrange the flat wiper blade ( 12 ) on the wiper arm ( 10 ), the open recess ( 26 ) of the connecting element ( 24 ) at least the side facing away from the pane can be closed. 9. Wiper device according to claim 8, characterized in that the locking unit ( 30 ) largely surrounds the connecting element ( 24 ). 10. Wiper device according to claim 8 or 9, characterized in that the locking unit ( 30 ) has the connecting element ( 24 ) laterally encompassing and / or engaging guide webs ( 68 ) which cooperate with guide grooves ( 64 ) provided on the connecting element ( 24 ) , 11. Wiper device according to one of claims 8 to 10, characterized in that the side of the locking unit facing the recess ( 26 ) is designed such that the sleeve element ( 28 ) can be held largely without play in the recess ( 26 ). 12. Wiper device according to one of claims 8 to 11, characterized in that the locking unit ( 30 ) on the side facing the recess comprises a spring element ( 32 , 80 , 84 ) which is suitable for arranging the in the recess ( 26 ) To apply a spring force to the sleeve element ( 28 ). 13. Wiper device according to claim 12, characterized in that the spring element ( 32 ) on the side facing the sleeve element ( 28 ) has at least one resilient elevation ( 84 ) which cooperates with a recess ( 54 ) arranged on the sleeve element ( 28 ) , 14. Wiper device according to one of claims 8 to 13, characterized in that a stop means is provided on the locking unit ( 30 ) or on the spring element ( 32 ) belonging to the locking unit ( 30 ), which is provided temporarily with one on the connecting element ( 24 ) Counter-stop means cooperates to prevent unwanted removal of the locking unit ( 30 ) from the connecting element ( 24 ). 15. Wiper device according to claim 14, characterized in that the spring tongue ( 84 ) temporarily takes over the function of the stop means and a ramp ( 86 ) provided on the connecting element ( 24 ) takes over the function of the counter stop means. 16. Wiper device according to one of claims 8 to 15, characterized in that a locking means is provided on the locking unit ( 30 ) or on the spring element ( 32 ) belonging to the locking unit ( 30 ), which is provided temporarily with one on the connecting element ( 24 ) counter-locking means cooperating to lock the locking unit (30) prior to assembly of the flat wiper blade (12) to the wiper arm (10) in the open position on the connecting element (24). 17. Wiper device according to claim 16, characterized in that the spring tongue ( 84 ) temporarily takes over the function of the locking means and a locking recess ( 96 ) formed on the connecting element ( 24 ) takes over the function of the counter-locking means, the locking recess ( 96 ) preferably directly in the Area of the connecting element ( 24 ) is arranged, which, viewed in the longitudinal direction of the flat wiper blade ( 12 ), adjoins the side of a ramp ( 86 ) on the connecting element ( 24 ) facing the center of the connecting element ( 24 ). 18. Wiper device according to claim 12 or 13, characterized in that the spring element ( 32 ) laterally around the connecting element ( 24 ) encompassing and engaging guide webs ( 68 ) which cooperate with existing on the connecting element ( 24 ) guide grooves ( 64 ). 19. Wiper device according to one of claims 8 to 18, characterized in that a projection ( 88 ) or a recess is arranged on the connecting element ( 24 ), which has a recess ( 90 ) arranged on the free end of the wiper arm ( 10 ). or an overhang for limiting the swivel angle of the flat wiper blade ( 12 ) cooperates with the wiper arm ( 10 ). 20. Wiper device according to claim 19, characterized in that the projection ( 88 ) or the recess ( 90 ) is arranged on the side facing the wiper blade ( 12 ) below the sleeve element ( 28 ). 21. Flat wiper blade ( 12 ) according to at least one of the preceding claims. 22. Wiper arm ( 10 ) according to at least one of the preceding claims.