Wiper strip and wiper blade comprising same

Abstract

The invention relates to a wiper strip, comprising: a wiper wedge (22), on which a wiper lip (24) is formed; the invention relates to a wiper strip (20) comprising a wiper wedge (22) and a head part (28) which is connected to the wiper wedge (22) by means of an inclined web (26) and which has, on each of two opposite sides of the head part (28), a longitudinal recess (30) for inserting a spring guide rail (42) into the head part (28) of the wiper strip (20), the head part (28) further comprising at least one damping element (32, 32b) for damping the spring guide rail (42) in the head part (28) of the wiper strip (20). The buffer element gradually narrows the cross section of one of the longitudinal grooves (30) with the free end.

Description

Field of the Invention

[0001] The present invention relates to a wiper strip, a wiper blade comprising the wiper strip, and their use according to the preamble of the independent claims. Background Art

[0002] Wiper blades for motor vehicles usually have a metal spring guide rail that is embedded in a rubber body, which is used to clean, for example, the front windshield of a motor vehicle. The spring guide rail is used to apply a corresponding pressing pressure to the rubber body of the wiper blade and thus ensure the cleaning effect of the wiper blade. At the end of the corresponding wiping movement of the wiper blade, at the reversal point of the wiper blade, the rubber body of the wiper blade will flip.

[0003] At this moment of the reversal point, a physical contact loss of the components of the rubber body relative to the metal spring guide rail may occur. Once a new wiping movement starts in the reverse direction, the physical contact between the rubber body and the spring guide rail is ensured again. However, due to the temporary contact loss between the rubber body and the spring guide rail, an uncomfortable commutation noise of the wiper blade may occur at the reversal point between two wiping movements. This noise generation is not desirable.

[0004] In this regard, it is known from DE 102008042004 A1 that a wiper strip for a wiper blade is provided, wherein the rubber body of the wiper strip has a head strip in contact with the spring guide rail and a support section in contact with the wiping lip facing the glass surface, and wherein the support section of the wiper strip and the opposing head strip are configured such that the support section rolls at the head strip when the wiping lip commutes.

[0005] Furthermore, it is known from DE 102019205931 A1 that another wiper strip is provided, wherein a buffer element is present between the support section including the wiping lip and the head section of the wiper strip, and the buffer element defines a collision surface at the reversal point during the operation of the wiper strip, and at the moment when the wiper strip flips, the buffer element and the head component of the wiper strip touch at this collision surface. Summary of the Invention

[0006] According to the present invention, there is provided a wiper strip, a wiper blade comprising the wiper strip, and their use having the features of the characterizing part of the independent claims.

[0007] Advantages of the Invention

[0008] There is thus provided a wiper strip in the form of a rubber body, the wiper strip comprising: a wiper wedge at which a wiper lip for cleaning a surface is configured; and a head member which is connected to the wiper wedge by an inclined tab, and the head member has longitudinal grooves on opposite sides of the head member with respect to the longitudinal extension of the wiper strip, the longitudinal grooves enabling a spring guide rail, in particular a metal one, to be inserted into the longitudinal grooves of the head strip. The head member of the wiper strip further comprises at least one buffer element which is positioned with at least one free end such that it tapers or narrows the opening cross-section of one of the longitudinal grooves.

[0009] A particular advantage of the described measures is that the flutter noise of a conventional wiper blade is avoided or at least reduced, which flutter noise would otherwise be generated by the loss of contact between the spring guide rail of the wiper blade and the rubber body held by the spring guide rail at the reversal point between two wiping movements. In contrast, the wiper strip according to the invention has a buffer element which tapers the longitudinal groove of the wiper strip for insertion of the spring guide rail due to the positioning of its free end. In addition, the buffer element also ensures reliable contact between the rubber body of the wiper strip and the spring guide rail embedded in the rubber body during the flipping movement of the wiper strip. Although this measure does not enable completely continuous contact to be obtained between the rubber body of the wiper strip and the spring guide rail embedded in the rubber body, at least a reduced gap occurs between the rubber body of the wiper strip and the spring guide rail embedded in the rubber body at the reversal point and thus a significantly reduced flutter noise is caused.

[0010] This is particularly attributable to the fact that the free end of the buffer element which narrows the longitudinal groove of the wiper strip bends from one side when the spring guide rail is inserted, so that the spring guide rail can be positioned completely fillingly in the longitudinal groove of the wiper strip, yet at the same time the buffer element remains in contact with the surface of the spring guide rail with a slight pressing force due to its elasticity.

[0011] If the rubber body flips at the reversal point between two wiping movements of the wiper strip and thus the rubber profile is deformed, more precisely the widening of the longitudinal groove occurs in the region of the head member of the wiper strip, so that a physical contact loss occurs between the rubber body and the spring guide rail. However, due to the pressing force of the free end of the buffer element against the spring guide rail, this free end still remains in physical contact with the spring guide rail. This advantageously acts in avoiding commutation noise during the reversal process of the rubber body of the wiper strip between two wiping processes. In this way, the commutation noise can be significantly reduced or even completely avoided.

[0012] A further advantageous embodiment of the invention is the subject matter of the dependent claims.

[0013] Advantageously, the head part of the wiper strip is made of a rubber material different from the damping element. In particular, the rubber materials of the head part and the damping element differ in their elastic properties. Herein, it is particularly advantageous that the damping element is made of a porous rubber material, for example.

[0014] Furthermore, it is advantageous that the damping element is made of the same rubber material as the inclined tab and the wiper wedge of the wiper strip, for example. This is based on the fact that generally the head part of the wiper strip is made of a relatively hard rubber material, while the inclined tab and the wiper wedge are made of a softer or more elastic rubber material. This more elastic rubber material also exhibits advantageous properties in the damping element in terms of its noise reduction function. Another advantage is that the rubber types hitherto used can continue to be used for the head part or for the inclined tab and the wiper wedge, and the use of a third additional rubber material can be avoided.

[0015] Furthermore, although in principle the same rubber type is used for the head part and the damping element of the wiper strip, rubber materials with different Shore hardnesses can be used respectively within the same rubber type. Herein, for example, a rubber material with a higher Shore hardness is used for the head part, and a rubber material with a lower Shore hardness is used for the damping element.

[0016] According to a further advantageous embodiment of the invention, the wiper strip according to the invention comprises a further damping element which is positioned between the wiper wedge and the head part, and which has an increasing spacing towards its free end relative to the head part of the wiper strip. At the reversal point between two wiping movements of the wiper strip, the wiper strip tilts in the region of the inclined tab and thus a collision of the damping element in the region of the head part may occur. Since this involves a cushioned collision, this measure results in a further reduction of the commutation noise during operation of the wiper strip.

[0017] According to a particularly advantageous embodiment of the invention, the wiper strip according to the invention furthermore comprises a further damping element which is positioned, for example, in the region of the longitudinal groove of the wiper strip in the same way as the first damping element, and which is positioned with its free end in such a way that it tapers or narrows the opening cross-section of one of the longitudinal grooves. However, the further damping element is arranged in the region of the longitudinal groove in such a way that it is arranged at the lateral interface of the longitudinal groove, which lateral interface is opposite to the other lateral interface where the first damping element is arranged. This enables a simplified insertion of the spring guide into the longitudinal groove of the wiper strip. Herein, it is feasible that the run of the free end of the further damping element narrows the longitudinal groove in the opposite direction with respect to the run of the free end of the first damping element.

[0018] According to a further particularly advantageous embodiment of the invention, the buffer element of the wiper strip has a curved or truncated cross-section in the region in contact with the spring guide rail to be inserted or already inserted into the longitudinal groove.

[0019] These two measures result in that, since the frictional resistance between the spring guide rail and the rubber material of the wiper strip is reduced, the corresponding wiper strip can be equipped with the spring guide rail in an easy manner during the assembly of the wiper blade.

[0020] The wiper strip according to the invention is used, for example, in wiper blades for vehicles such as motor vehicles, rail vehicles or aircraft. In addition, the wiper strip or the wiper blade comprising the wiper strip is suitable for cleaning fixed building-mounted glass or for cleaning the surface of a sensor, in particular the surface of an optical sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Embodiments of the invention are shown in the drawings and are explained in more detail in the following description of the drawings. Among them:

[0022] Figure 1a 、 Figure 1b shows a schematic cross-section of a wiper blade according to the prior art,

[0023] Figure 2 shows a schematic cross-section of a wiper strip according to a first embodiment of the invention,

[0024] Figure 3 shows a schematic cross-section of a wiper blade according to an embodiment of the invention,

[0025] Figures 4a to 4c shows Figure 3 the situation of the wiper blade shown in during the wiper movement,

[0026] Figure 5 shows a schematic cross-section of a wiper strip according to a second embodiment of the invention,

[0027] Figure 6 shows a schematic cross-section of a wiper strip according to a third embodiment of the invention,

[0028] Figure 7 shows a schematic cross-section of a wiper strip according to a fourth embodiment of the invention,

[0029] Figure 8 shows a schematic cross-section of a wiper strip according to a fifth embodiment of the invention,

[0030] Figure 9 shows a schematic cross-section of a wiper strip according to a sixth embodiment of the invention,

[0031] Figure 10 shows a schematic cross-section of a wiper strip according to a seventh embodiment of the present invention,

[0032] Figure 11 shows a schematic cross-section of a wiper strip according to an eighth embodiment of the present invention,

[0033] Figure 12 shows a schematic cross-section of a wiper strip according to a ninth embodiment of the present invention,

[0034] Figure 13 shows a schematic cross-section of a wiper strip according to a tenth embodiment of the present invention,

[0035] Figure 14 shows a schematic cross-section of a wiper strip according to an eleventh embodiment of the present invention,

[0036] Figure 15 shows a schematic cross-section of a wiper strip according to a twelfth embodiment of the present invention,

[0037] Figure 16 shows a schematic cross-section of a wiper strip according to a thirteenth embodiment of the present invention,

[0038] Figure 17 shows a schematic cross-section of a wiper strip according to a fourteenth embodiment of the present invention,

[0039] Figure 18 shows a schematic cross-section of a wiper strip according to a fifteenth embodiment of the present invention,

[0040] Figure 19 shows a schematic cross-section of a wiper strip according to a sixteenth embodiment of the present invention, and

[0041] Figure 20 shows a schematic cross-section of a wiper strip according to a seventeenth embodiment of the present invention. Detailed Embodiments

[0042] In Figure 1a and Figure 1b shows the situation of a wiper blade during a wiping movement according to the prior art. Here, the wiper blade 10 includes a rubber body 12 and a spring guide rail 14 embedded in the rubber body. If the wiper blade 10 is guided on the surface to be cleaned in the movement direction illustrated by the arrow 16, separation of the surface of the rubber body 12 from the surface of the spring guide rail 14 occurs in the region 18. Thereby, a flipping noise is generated under the influence of the opposite deformation of the rubber body 12 when the movement direction changes, and this flipping noise is basically associated with the rubber body 12 hitting the surface of the spring guide rail 14.

[0043] InFigure 2 Shown therein is a wiper strip according to a first embodiment of the present invention. The wiper strip 20 here includes a wiper wedge 22, which forms a wiper lip 24 at its end. The wiper wedge 22 is connected to the head part 28 of the wiper strip 20 by means of an inclined tab 26. The head part 28 is implemented, for example, from a rubber material that is harder than the inclined tab 26 or the wiper wedge 22. In addition, the head part 28 includes two longitudinal grooves 30 introduced into opposite sides of the head part 28. These longitudinal grooves are used for embedding a bearing element, for example in the form of a metal spring guide rail, which is used to fasten the wiper strip 20 to the wiper arm.

[0044] In addition, the head part 28 additionally includes a first buffer element 32, which is constructed in the region of the longitudinal grooves 30 on opposite sides of the head part 28. Here, the first buffer element 32 has, for example, a bar shape and is formed onto the head part 28, for example, with one of its longitudinal faces. In addition, the first buffer element 32 is positioned relative to the head part 28 such that the first buffer element respectively reduces or narrows or tapers the net cross-section of the longitudinal grooves 30 with its free part or free end facing away from the head part 28 at the end.

[0045] In addition, the first buffer element 32 is constructed on the head part 28 such that a gap 34 facing away from the longitudinal grooves 30 is formed between the first buffer element and the material of the head part 28, wherein the gap width of the gap 34 increases or widens towards the free end of the first buffer element 32.

[0046] The first buffer element 32 is implemented, for example, from a soft or highly elastic rubber material. Here, it can also relate, for example, to the rubber material from which the inclined tab 26 or the wiper wedge 22 of the wiper strip 20 is implemented. However, there is also a feasible solution to use a porous or foamed rubber material as the rubber material for the first buffer element 32. In addition, there is a feasible solution that the first buffer element 32 is made of the same type of rubber as the head part 28, but is made of a rubber material with a lower Shore hardness compared to the rubber material of the head part 28. The first buffer element 32 and the head part 28 of the wiper strip 20 can be made, for example, by co-extrusion molding.

[0047] In Figure 3 schematically shown is a wiper blade 40, which includes the wiper strip 20 according to FIG. 1. Here, the same reference numerals denote the same component assemblies as in Figure 2 In.

[0048] In addition to the wiper strip 20, the wiper blade 40 further includes a spring guide rail 42, which serves as a bearing element for the wiper strip 20 and is inserted into the longitudinal grooves 30 of the wiper strip 20 on both sides. As can be seen fromFigure 3 As can be schematically recognized, the insertion of the spring guide 42 causes the longitudinal groove 30 to widen in the region where it narrows due to the presence of the first buffer element 32.

[0049] During Figures 4a to 4c the characteristics of the wiper blade 40 during different stages of the wiping process on the surface to be cleaned are schematically shown. The same reference numerals continue to denote the same component assemblies as in the previous figures.

[0050] Figures 4a to 4c In particular, the deformation of the wiper strip 20 that occurs when the direction of movement of the wiper blade 40 in operation is reversed is illustrated. Thus, in Figure 4a the situation of the wiper blade 40 during the first direction of movement illustrated by the arrow 16 is shown, in Figure 4b the situation during the stationary state that occurs at the reversal point is shown, and in Figure 4c the situation of the wiper blade 40 during the reverse movement of the wiper blade 40 that occurs after the reversal point is shown, and this reverse movement is also illustrated by the arrow 16. It can be recognized that during any of the movement stages in the movement stages illustrated in Figures 4a to 4c there is no separation of the wiper strip 20 from the spring guide 42, but rather the spring guide 42 is always defined and guided on both sides by the assembly of the head parts 28 of the wiper strip 20 throughout the process.

[0051] Furthermore, it can be recognized that, as illustrated in Figure 4a and Figure 4c the shear force acting on the wiper strip 20 is partially intercepted in terms of force due to the narrowing of the gap 34, and noise formation is prevented due to the buffering effect of the first buffer element 32. Thus, by closing the gap 34, the support of the wiper strip 20 on the spring guide 42 is achieved. This causes the noise formation in this region to be minimized as much as possible.

[0052] During Figure 5 a wiper strip according to a second embodiment of the invention is schematically shown.

[0053] Figure 5 The wiper strip 20 shown in

[0054] During the wiping process, the inclination of the rubber body of the wiper blade 20 occurs as already described. The additional buffer element 32a now causes that when the wiper wedge 22 inclines relative to the head part 28, there is no hard impact of the components of the wiper wedge 22 against the large surface of the head part 28 facing the wiper wedge. Instead, there is a cushioned impact due to the additional buffer element 32a arranged between them and thus the commutation noise is suppressed. The additional buffer element 32a can for example be implemented from the same rubber material as the first buffer element 32.

[0055] During Figure 6 FIG. shows schematically a wiper blade according to a third embodiment of the invention.

[0056] Figure 6 The wiper blade 20 shown in FIG. additionally includes an additional buffer element 32b in addition to the first buffer element 32. The additional buffer element is arranged horizontally symmetrically and is also provided in the longitudinal groove 30 in the region of the head part 28. Here, the additional buffer element 32b for example has a bar shape like the first buffer element 32 and is for example formed against the head part 28 with one of its longitudinal faces as well.

[0057] The additional buffer element 32b is arranged in the region of the longitudinal groove 30 such that the additional buffer element is arranged at the lateral interface of the longitudinal groove 30, which lateral interface is opposite to the other lateral interface where the first buffer element 32 is arranged. This enables the simplified insertion of the spring guide 42 into the longitudinal groove 30 of the wiper blade 20. In addition, the additional buffer element 32b is positioned relative to the head part 28 such that the additional buffer element respectively reduces or narrows or tapers the net cross-section of the longitudinal groove 30 with its free part at the end facing away from the head part 28.

[0058] In addition, the additional buffer element 32b is also constructed at the head part 28 such that an additional gap 34a facing away from the longitudinal groove 30 is formed between the additional buffer element and the material of the head part 28, wherein the gap width of the additional gap 34a increases or widens towards the free end of the additional buffer element 32b.

[0059] The additional buffer element 32b is for example implemented from a rubber material similar to the first buffer element 32.

[0060] This further reduces the possible flipping noise at the reversal point between two wiping movements of the wiper blade and at the same time enables the simplified introduction of the spring guide 14 into the longitudinal groove 30 of the head part 28.

[0061] During Figure 7 FIG. shows schematically a wiper blade according to a fourth embodiment of the invention.

[0062] Figure 7 The wiper strip 20 shown in the figure additionally includes, in addition to the first buffer element 32, a further buffer element 32b which is arranged symmetrically horizontally and is also provided in the longitudinal groove 30 in the region of the head part 28. Here, the further buffer element 32b has, for example, a bar-shaped shape like the first buffer element 32 and is formed, for example, with one of its longitudinal faces on the head part 28 as well. Furthermore, the further buffer element 32b is positioned relative to the head part 28 such that the net cross-section of the longitudinal groove 30 is reduced or narrowed or tapered by the free part of the further buffer element which faces away from the head part 28 at its end. Different from Figure 6 the embodiment shown in the figure, the further buffer element 32b is arranged in the opposite direction or faces the central region of the head part 28 with its free part compared to the further buffer element 32b according to Figure 6 .

[0063] The further buffer element 32b is constructed on the head part 28 such that a further gap 34a facing the bottom of the longitudinal groove 30 is formed between the further buffer element and the material of the head part 28, wherein the gap width of the further gap 34a increases or widens towards the free end of the further buffer element 32b.

[0064] In Figure 8 a wiper strip according to a fifth embodiment of the invention is schematically shown.

[0065] Figure 8 The wiper strip 20 shown in the figure additionally includes, in addition to the first buffer element 32, a further buffer element 32b which is arranged in the region of the longitudinal groove 30 such that the further buffer element is arranged at the lateral interface of the longitudinal groove 30 which is opposite to the other lateral interface where the first buffer element 32 is arranged. Here, the further buffer element 32b is formed, for example, as a projection for narrowing the cross-section of the longitudinal groove. This also enables the spring guide 42 to be simply inserted into the longitudinal groove 30 of the wiper strip 20.

[0066] In Figure 9 a wiper strip according to a sixth embodiment of the invention is schematically shown.

[0067] The head part 28 of the wiper strip 20 here includes the first buffer element 32 as in Figure 2 the first embodiment shown in the figure, which is formed in the region of the longitudinal groove 30 on the opposite sides of the head part 28, however different from according to Figure 2In contrast to the embodiment of the present invention, the first cushioning element 32 is configured on the opposite lateral boundary surface of the longitudinal groove 30. Here, the first cushioning element 32 also has a strip shape, for example, and is integrally formed on the head part 28 with one of its longitudinal faces. In addition, the first cushioning element 32 is positioned relative to the head part 28 in such a way that the first cushioning element reduces or narrows or tapers the net cross section of the longitudinal groove 30 with its free part at the end facing away from the head part 28.

[0068] Furthermore, the first damping element 32 is also formed on the head part 28 such that a gap 34 facing away from the longitudinal groove 30 is formed between the material of the first damping element and the head part 28 , wherein the gap width of the gap 34 increases or widens toward the free end of the first damping element 32 .

[0069] exist Figure 10 A wiper strip according to a seventh specific embodiment of the invention is schematically shown in FIG.

[0070] The head part 28 of the wiper strip 20 is shown in this case Figure 2 As in the first embodiment shown in , it additionally comprises a first cushioning element 32, which is constructed in the region of the longitudinal groove 30 on the opposite side of the head part 28. Here, the first cushioning element 32 also has a strip shape, for example, and is formed onto the head part 28 with one of its longitudinal faces, for example. In addition, the first cushioning element 32 is positioned relative to the head part 28 so that it reduces or narrows or tapers the net cross section of the longitudinal groove 30 with its free part at the end facing away from the head part 28. However, this is different here from the embodiment according to Figure 2 Compared to the embodiment of , this is done in the opposite way in that the free part or the free end of the first damping element 32 is oriented toward the center of the wiper strip.

[0071] exist Figure 11 Schematically shows a wiper strip according to an eighth specific embodiment of the invention.

[0072] The head part 28 of the wiper strip 20 is as shown in Figure 9 As in the sixth embodiment shown in FIG. 1 , the first damping element 32 is formed on the opposite side of the head part 28 in the region of the longitudinal groove 30 in accordance with Figure 9 In addition, the first cushioning element 32 is similar to Figure 10 The seventh embodiment shown in FIG. 8 is oriented with its free part toward the center of the wiper strip 20 .

[0073] exist Figure 12 Schematically shows a wiper strip according to a ninth specific embodiment of the invention.

[0074] The head part 28 of the wiper strip 20 here includes first buffer elements 32, 32b which are arranged in the region of the longitudinal groove 30 on opposite sides of the head part 28 in a combined manner of the seventh and eighth embodiments and on both sides on the opposite lateral interfaces of the longitudinal groove 30 and are oriented with their free parts towards the center of the wiper strip 20.

[0075] In Figure 13 a wiper strip according to a tenth embodiment of the invention is schematically shown.

[0076] The head part 28 of the wiper strip 20 here includes first buffer elements 32, 32b which are arranged in the region of the longitudinal groove 30 on opposite sides of the head part 28 in a combined manner of the sixth and seventh embodiments and on both sides on the opposite lateral interfaces of the longitudinal groove 30.

[0077] In Figure 14 a wiper strip according to an eleventh embodiment of the invention is schematically shown.

[0078] The head part 28 of the wiper strip 20 here includes a first buffer element 32 as in the first embodiment shown in Figure 2 which is constructed in the region of the longitudinal groove 30 on opposite sides of the head part 28. Here, the first buffer element 32 has, for example, a double-bar shape and is formed, for example, with one of its longitudinal faces onto the head part 28. In addition, the first buffer element 32 is positioned relative to the head part 28 such that it respectively reduces or narrows or tapers the net cross-section of the longitudinal groove 30 with its two free parts or free ends at the ends that face away from the head part 28.

[0079] In Figure 15 a wiper strip according to a twelfth embodiment of the invention is schematically shown.

[0080] The head part 28 of the wiper strip 20 here includes a first buffer element 32 as in the eleventh embodiment shown in Figure 14 which is constructed in the region of the longitudinal groove 30 on opposite sides of the head part 28, however, is constructed on the opposite lateral interfaces of the longitudinal groove 30 compared to the embodiment according to Figure 14 Here, the first buffer element 32 also has, for example, a double-bar shape and is formed, for example, with one of its longitudinal faces onto the head part 28. In addition, the first buffer element 32 is positioned relative to the head part 28 such that it respectively reduces or narrows or tapers the net cross-section of the longitudinal groove 30 with its two free parts or free ends at the ends that face away from the head part 28.

[0081] In Figure 16 is schematically shown a wiper strip according to a thirteenth embodiment of the present invention.

[0082] The head part 28 of the wiper strip 20 here includes first buffer elements 32, 32b which are arranged in the region of the longitudinal groove 30 on opposite sides of the head part 28 in a combined manner of the eleventh and twelfth embodiments and are arranged on opposite lateral dividing surfaces of the longitudinal groove 30 on both sides.

[0083] In Figure 17 is schematically shown a wiper strip according to a fourteenth embodiment of the present invention.

[0084] The head part 28 of the wiper strip 20 here includes a first buffer element 32 as in the first embodiment shown in Figure 2 which is constructed in the region of the longitudinal groove 30 on opposite sides of the head part 28. Here, the first buffer element 32 also has, for example, a bar shape and is formed, for example, with one of its longitudinal faces onto the head part 28. Furthermore, the first buffer element 32 is positioned relative to the head part 28 such that the first buffer element respectively reduces or narrows or tapers the net cross-section of the longitudinal groove 30 with its free part facing away from the head part 28 at the end. The first buffer element 32 is designed such that in the region where surface contact with the spring strip 42 occurs when the spring strip 42 is inserted into the longitudinal groove 30 of the wiper strip 20, the first buffer element has a truncated region 38 facing the spring strip, and the truncated region preferably abuts against the surface of the spring guide 42 to be inserted or already inserted in a planar manner. This embodiment thus ensures particularly effective suppression of the commutation noise of the wiper strip 20 during later operation.

[0085] In Figure 18 is schematically shown a wiper strip according to a fifteenth embodiment of the present invention.

[0086] The head part 28 of the wiper strip 20 here is as in Figure 17In the fourteenth embodiment shown, a first buffer element 32 is included as in the case where it is constructed in the region of the longitudinal groove 30 on the opposing side portions of the head member 28. Here, the first buffer element 32 also has, for example, a bar shape and is formed, for example, with one of its longitudinal faces against the head member 28. Further, the first buffer element 32 is positioned relative to the head member 28 such that the net cross-section of the longitudinal groove 30 is reduced or narrowed or tapered respectively by the free portion of the first buffer element that is away from the head member 28 at its end. The first buffer element 32 is designed such that in the region where the spring strip 42 comes into surface contact with the first buffer element when the spring strip 42 is inserted into the longitudinal groove 30 of the wiper strip 20, the first buffer element has a curved region 39 facing the spring strip, and this curved region preferably abuts against the surface of the spring guide 42 to be inserted or already inserted in a planar manner. This embodiment thus also ensures particularly effective suppression of the commutation noise of the wiper strip 20 during later operation.

[0087] In Figure 19 FIG. schematically shows a wiper strip according to the sixteenth embodiment of the present invention.

[0088] The head member 28 of the wiper strip 20 here includes a first buffer element 32 as in the first embodiment shown in Figure 2 which is constructed in the region of the longitudinal groove 30 on the opposing side portions of the head member 28. Here, the first buffer element 32 also has, for example, a bar shape and is formed, for example, with one of its longitudinal faces against the head member 28. Further, the first buffer element 32 is positioned relative to the head member 28 such that the net cross-section of the longitudinal groove 30 is reduced or narrowed or tapered respectively by the free portion of the first buffer element that is away from the head member 28 at its end. The first buffer element 32 is designed such that the free portion or free end of the first buffer element has a beveled profile 50, and when the spring strip 42 is inserted into the longitudinal groove 30 of the wiper strip 20, this beveled profile comes into surface contact with the spring strip 42 and preferably abuts against the surface of the spring guide 42 to be inserted or already inserted in a planar manner. This embodiment thus also ensures particularly effective suppression of the commutation noise of the wiper strip 20 during later operation.

[0089] In Figure 20 FIG. schematically shows a wiper strip according to the seventeenth embodiment of the present invention.

[0090] The head member 28 of the wiper strip 20 here is as in Figure 2In the first embodiment shown in [reference], it includes a first buffer element 32 constructed in the region of the longitudinal groove 30 on the opposing side portions of the head member 28. Here, the first buffer element 32 is implemented, for example, as a hollow profile 41 having a cross-section such as a rhombus and is shaped, for example, at the head member 28 in the region of the longitudinal edge. In addition, the first buffer element 32 is positioned relative to the head member 28 such that the first buffer element respectively reduces, narrows, or tapers the net cross-section of the longitudinal groove 30 with its free longitudinal edge at the end facing away from the head member 28.

Claims

1. A wiper blade, the wiper blade comprising: A wiper wedge (22) at which a wiper lip (24) is configured; and a head part (28) which is connected to the wiper wedge (22) by means of an inclined tab (26), and which has longitudinal grooves (30) on two opposite sides of the head part (28) for inserting spring guides (42) into the head part (28) of the wiper strip (20), characterized in that the head part (28) furthermore has at least one damping element (32, 32b) which tapers the cross-section of one of the longitudinal grooves (30) by means of at least one free end.

2. The wiper strip according to claim 1, characterized in that, Damping elements (32, 32b) are provided on both sides at the head part (28) of the wiper strip (20).

3. The wiper strip according to claim 1 or 2, characterized in that, In the case where a gap (34a) is configured between the free ends of the head part (28) and the damping element (32, 32b) and the large surface facing away from the respective longitudinal groove (30), the at least one damping element (32, 32b) tapers the cross-section of one of the longitudinal grooves (30) by means of its free end.

4. The wiper strip according to any one of the preceding claims, characterized in that, At least one first damping element (32, 32b) is positioned at a first lateral interface of the longitudinal groove (30) and tapers the cross-section of the longitudinal groove (30) by means of its free end, and furthermore at least one additional damping element (32b) is provided which is positioned at a second lateral interface of the longitudinal groove (30) opposite to the first lateral interface, and which tapers the cross-section of the same longitudinal groove (30) by means of its free end.

5. The wiper strip according to claim 4, characterized in that, The free end of the additional damping element (32b) tapers the cross-section of the longitudinal groove (30) in a direction opposite to the free end of the first damping element (32).

6. The wiper strip according to any one of the preceding claims, characterized in that, The damping elements (32, 32b) have a curved or truncated cross-section (38, 39) in the region of contact with the spring guide (42) to be inserted into the longitudinal groove (30).

7. The wiper strip according to any one of the preceding claims, characterized in that, An additional damping element (32a) is arranged between the wiper wedge (22) and the head part (28), wherein the spacing between the additional damping element (32a) and the head part (28) increases towards the free end of the additional damping element (32a).

8. The wiper strip according to any one of the preceding claims, characterized in that, The head part (28) and the damping elements (32, 32a, 32b) are made of different rubber types with different elastic properties.

9. The wiper strip according to any one of the preceding claims, characterized in that, The damping elements (32, 32a, 32b) are at least partially implemented from porous rubber material.

10. The wiper strip according to any one of the preceding claims, characterized in that, The damping elements (32, 32a, 32b) are implemented from the same rubber material as the wiper wedge (22), the wiper lip (24) and / or the inclined tab (26) of the wiper strip (20).

11. The wiper strip according to any one of claims 1 to 7, characterized in that, Compared with the head part (28) of the wiper strip (20), the damping elements (32, 32a, 32b) are made of the same rubber type, however with different Shore hardnesses.

12. A wiper blade, which comprises a wiper strip according to any one of the preceding claims.

13. Use of a wiper strip according to any one of claims 1 to 11 or a wiper blade according to claim 12 for cleaning vehicle window glass or glass installed in a stationary building and sensor surfaces.

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