Wiper bar and wiper blade containing these

Description

[0001] The present invention relates to a wiper strip, a wiper blade containing the wiper strip, and their use according to the preamble of the independent claims. State of the art

[0002] Motor vehicle wiper blades typically feature metal spring strips that engage with a rubber body, which is used to clean, for example, the windshield. The spring strip exerts the necessary pressure on the rubber body of the wiper blade, thus ensuring its cleaning effect. At the end of each wiping motion, the rubber body of the wiper blade flips over at a reversal point.

[0003] At the moment of reversal, there may be a temporary loss of physical contact between parts of the rubber blade and the metal spring rail. As soon as a new wiping motion begins in the opposite direction, physical contact between the rubber blade and spring rail is restored. However, this temporary loss of contact between the rubber blade and spring rail can cause unpleasant rattling noises from the wiper blade at the reversal point between two wiping motions. Such noise is undesirable.

[0004] In this regard, it is known from DE 10 2008 042 004 A1 or from DE 10 2005 053811 A1 to provide a wiper strip for a wiper blade, in which the rubber body of the wiper strip has a head strip in contact with a spring rail and a support section in contact with a wiper lip facing a glass surface, wherein the support section and the opposite head strip of the wiper strip are designed such that when the wiper lip is folded over, the support section rolls off the head strip.

[0005] Furthermore, from DE 10 2019 205 931 A1 another wiper strip is known in which a damping element is located between a support section encompassing the wiper lip and a head section of the wiper strip, which defines a stop surface at the reversal point of the wiper strip during operation, at which the damping element and the head part of the wiper strip touch at the moment of the wiper strip being folded over. Disclosure of the invention

[0006] According to the invention, a wiper strip, a wiper blade containing it and their use are provided with the characterizing features of the independent patent claims. Advantages of the invention

[0007] A wiper blade in the form of a rubber body is provided, comprising a wiper wedge with a wiping lip for cleaning a surface, and a head section connected to the wiper wedge via a tilting link. The head section has longitudinal grooves on opposite sides, extending along the length of the wiper blade, allowing a spring rail, particularly a metallic one, to engage in these grooves. The head section of the wiper blade further comprises at least one damping element, positioned with at least one free end to reduce or narrow the opening cross-section of one of the longitudinal grooves.

[0008] The particular advantage of the described measure is that it avoids or at least reduces the folding noise of a conventional wiper blade, which otherwise occurs at the reversal point between two wiping movements due to a loss of contact between a spring rail of the wiper blade and a rubber body held by the spring rail. In contrast, the wiper strip according to the invention has a damping element which, due to the positioning of its free end, narrows the longitudinal groove of the wiper strip that serves for engagement by a spring rail. This ensures reliable contact between the rubber body of the wiper strip and a spring rail engaging within it, even during a folding movement of the wiper strip.Should the contact between the rubber body of the wiper strip and a spring rail engaging in it not be fully maintained despite this measure, a reduced gap will still occur between the rubber body of the wiper strip and a spring rail engaging in it at the reversal point, resulting in significantly reduced folding noises.

[0009] This is primarily due to the fact that when a spring rail is inserted, a free end of the damping element, which narrows the longitudinal groove of the wiper strip, is bent to the side, so that the spring rail can be positioned to fully fill the longitudinal groove of the wiper strip, but at the same time the damping element remains in contact with the surface of the spring rail with a slight contact pressure due to its elasticity.

[0010] If, at the wiper blade's reversal point between two wiping motions, the rubber body folds over, resulting in a geometric distortion of the rubber profile, the longitudinal groove in the area of ​​the wiper blade's head may widen to such an extent that a physical loss of contact occurs between the rubber body and the spring rail. However, due to the contact pressure of the free end of the damping element against the spring rail, it remains in physical contact with the spring rail. This has a beneficial effect in preventing the rubber body of the wiper blade from folding over during the reversal process between two wiping motions. In this way, such folding noises can be significantly reduced or even completely eliminated.

[0011] Further advantageous embodiments of the present invention are the subject of the dependent claims.

[0012] It is therefore advantageous if the head of the wiper blade is made of a different rubber material than the damping element. In particular, the rubber materials of the head and damping element differ in their elastic properties. It is especially beneficial if the damping element is made of a porous rubber material, for example.

[0013] Furthermore, it is advantageous if the damping element is made of the same rubber material as the tilting bridge and the wiper blade of the wiper strip. This is because the head of a wiper strip is typically made of a relatively hard rubber material, while the tilting bridge and wiper blade are made of a softer or more elastic rubber material. Such an elastic rubber material also exhibits favorable properties in a damping element with regard to its noise-dampening function. Another advantage is that the rubber types previously used for the head, tilting bridge, and wiper blade can continue to be used, thus avoiding the need for a third, additional rubber material.

[0014] Furthermore, it is possible to use the same type of rubber for both the head and the damping element of the wiper blade, but with different Shore hardnesses from the same rubber type. For example, a rubber material with a higher Shore hardness is used for the head, and a rubber material with a lower Shore hardness is used for the damping element.

[0015] According to a further advantageous embodiment of the present invention, the wiper blade according to the invention comprises a further damping element, which is positioned between the wiper blade and the head and which has an increasing distance from the head of the wiper blade towards its free end. At the reversal point of the wiper blade between two wiping movements, the wiper blade tilts in the area of ​​the tilting bridge and thus the damping element may strike areas of the head. Since this is a damped impact, this measure leads to a further reduction in the noise of the wiper blade tilting during operation.

[0016] According to a particularly advantageous embodiment of the present invention, the wiper strip according to the invention further comprises a further damping element, which, for example, is also positioned in the region of the longitudinal grooves of the wiper strip, just like the first damping element, and which is also positioned with its free end such that it narrows or reduces the opening cross-section of one of the longitudinal grooves. However, this further damping element is arranged in the region of the longitudinal grooves such that it is located on a side boundary surface of the longitudinal groove that is opposite a further side boundary surface on which the first damping element is located. This facilitates the insertion of a spring rail into the longitudinal grooves of the wiper strip. It is possible for the free end of the further damping element to narrow the longitudinal groove in the opposite direction to the course of the free end of the first damping element.

[0017] According to a further particularly advantageous embodiment of the present invention, the damping element of the wiper strip in an area that comes into contact with a spring rail to be inserted or inserted into the longitudinal groove is designed with a bent or flattened cross-section.

[0018] Both measures ensure that the corresponding wiper strip can be easily fitted with spring rails during the installation of the wiper blade, as the frictional resistance between the spring rail and the rubber material of the wiper strip is reduced.

[0019] The wiper strip according to the invention is used, for example, in wiper blades for vehicles such as motor vehicles, rail vehicles, or aircraft. Furthermore, the wiper strip, or a wiper blade containing it, is suitable for cleaning stationary building glazing or for cleaning sensor surfaces, in particular the surfaces of optical sensors. Brief description of the drawing

[0020] The drawing illustrates embodiments of the present invention, which are explained in more detail in the subsequent description of the figures. It shows: Figures 1a, 1b show a schematic cross-section of a wiper blade according to the prior art, Figure 2 shows a schematic cross-section of a wiper strip according to a first embodiment of the present invention, Figure 3 shows a schematic cross-section of a wiper blade according to an embodiment of the present invention, Figures 4a to 4c show the in Figure 3Figure 5 shows the wiper blade during a wiping motion, Figure 6 shows the schematic cross-section of a wiper strip according to a second embodiment of the present invention, Figure 7 shows the schematic cross-section of a wiper strip according to a fourth embodiment of the present invention, Figure 8 shows the schematic cross-section of a wiper strip according to a fifth embodiment of the present invention, Figure 9 shows the schematic cross-section of a wiper strip according to a sixth embodiment of the present invention, Figure 10 shows the schematic cross-section of a wiper strip according to a seventh embodiment of the present invention, Figure 11 shows the schematic cross-section of a wiper strip according to an eighth embodiment of the present invention.Figure 12 shows a schematic cross-section of a wiper strip according to a ninth embodiment of the present invention; Figure 13 shows a schematic cross-section of a wiper strip according to a tenth embodiment of the present invention; Figure 14 shows a schematic cross-section of a wiper strip according to an eleventh embodiment of the present invention; Figure 15 shows a schematic cross-section of a wiper strip according to a twelfth embodiment of the present invention; Figure 16 shows a schematic cross-section of a wiper strip according to a thirteenth embodiment of the present invention; Figure 17 shows a schematic cross-section of a wiper strip according to a fourteenth embodiment of the present invention; Figure 18 shows a schematic cross-section of a wiper strip according to a fifteenth embodiment of the present invention.Figure 19 shows a schematic cross-section of a wiper strip according to a sixteenth embodiment of the present invention, and Figure 20 shows a schematic cross-section of a wiper strip according to a seventeenth embodiment of the present invention. Description of the exemplary implementations

[0021] In the Figures 1a and 1bA wiper blade according to the prior art is shown during a wiping movement. The wiper blade 10 comprises a rubber body 12 and spring rails 14 engaging with it. When the wiper blade 10 is guided over a surface to be cleaned in a direction of movement indicated by arrows 16, the rubber body 12 detaches from the surface of the spring rail 14 in areas 18. When the direction of movement changes, a flipping noise occurs due to a reverse deformation of the rubber body 12, which is essentially attributable to the rubber body 12 striking the surfaces of the spring rail 14.

[0022] In Figure 2A wiper strip according to a first embodiment of the present invention is shown. The wiper strip 20 comprises a wiper wedge 22, which forms a wiper lip 24 at its end. The wiper wedge 22 is connected to a head section 28 of the wiper strip 20 via a tilting bridge 26. The head section 28 is, for example, made of a harder rubber material than the tilting bridge 26 or the wiper wedge 22. Furthermore, the head section 28 comprises two longitudinal grooves 30 provided on opposite sides of the head section 28. These grooves serve to engage a support element, for example in the form of metallic spring rails, which serves to attach the wiper strip 20 to a wiper arm.

[0023] Furthermore, the head section 28 additionally includes first damping elements 32, which are formed on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30. These first damping elements 32 have, for example, a strip-shaped form and are, for example, integrally formed with one of their longitudinal surfaces against the head section 28. The first damping elements 32 are also positioned relative to the head section 28 such that their terminal free portion or end, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30.

[0024] Furthermore, the first damping elements 32 are designed on the head part 28 in such a way that gaps 34 are formed between them and the material of the head part 28 facing away from the longitudinal grooves 30, whereby the gap width of the gaps 34 increases or widens in the direction of the free ends of the first damping elements 32.

[0025] The first damping elements 32 are made, for example, of a soft or highly elastic rubber material. This could be, for instance, the same rubber material used for the tilting bridge 26 or the wiper wedge 22 of the wiper strip 20. However, it is also possible to use a porous or foam-like rubber material for the first damping elements 32. Furthermore, the first damping elements 32 could be made of the same type of rubber as the head 28, but with a lower Shore hardness compared to the rubber material of the head 28. The first damping elements 32 and the head 28 of the wiper strip 20 can be manufactured, for example, by co-extrusion.

[0026] In Figure 3 A wiper blade 40 is shown schematically, which has a wiper strip 20 according to Figure 1includes. The same reference symbols denote the same component parts as in Figure 2 .

[0027] The wiper blade 40 comprises, in addition to the wiper strip 20, spring rails 42, which serve as a support element for the wiper strip 20 and which are inserted into the longitudinal grooves 30 of the wiper strip 20 on both sides. As shown from Figure 3 As can be seen schematically, the insertion of the spring rails 42 leads to a widening of the longitudinal groove 30 in the areas narrowed by the existence of the first damping elements 32.

[0028] In the Figures 4a to 4c The behavior of the wiper blade 40 during different stages of a wiping process across a surface to be cleaned is schematically depicted. The same reference symbols denote the same component parts as in the preceding figures.

[0029] The Figures 4a to 4cThis is particularly illustrated by the deformations of the wiper strip 20 that occur when the direction of movement of the wiper blade 40 is reversed during operation. Thus, in Figure 4a the wiper blade 40 is shown during a first direction of movement as indicated by the arrow 16, in Figure 4b during a standstill at the reversal point and in Figure 4c a wiper blade 40 during a counter-rotating movement of the wiper blade 40 occurring after the reversal point, which is also illustrated by an arrow 16. It is evident that in none of the movement stages, which are shown in Figure 4a to 4c It is made clear that the wiper strip 20 does not detach from the spring rails 42, but that the spring rails 42 are always limited and guided on both sides by components of the head part 28 of the wiper strip 20 during the entire process.

[0030] Furthermore, it is evident that - as in the Figures 4a and 4cThis illustrates that the shear forces acting on the wiper strip 20 are partially absorbed by a narrowing of the gaps 34, and that noise formation is prevented by the damping effect of the first damping elements 32. Closing the gap 34 thus supports the wiper strip 20 on the spring rail 42. This leads to a significant reduction in noise formation in this area.

[0031] In Figure 5 A wiper strip according to a second embodiment of the present invention is shown schematically.

[0032] The in Figure 5The wiper strip 20 shown comprises, in addition to first damping elements 32, further damping elements 32a, which are provided in the area of ​​the tilting bridge 26. Therefore, the wiper strip 20 includes a first tilting bridge 26 and a second tilting bridge 26a, with the further damping elements 32a positioned between the two tilting bridges 26, 26a. The further damping elements 32a have a similar structure to the first damping elements 32 and are, for example, strip-shaped and anchored, for instance, at the end face of the wiper strip 20.

[0033] During a wiping operation, as already described, the rubber body of the wiper blade 20 tilts. The additional damping elements 32a ensure that when the wiper blade 22 tilts relative to the head 28, there is no hard impact of parts of the wiper blade 22 onto the large surface of the head 28 facing it, but rather – due to the additional damping elements 32a arranged between them – a damped impact occurs, thus suppressing tilting noises. The additional damping elements 32a can, for example, be made of the same rubber material as the first damping elements 32.

[0034] In Figure 6 A wiper strip according to a third embodiment of the present invention is shown schematically.

[0035] The in Figure 6The illustrated wiper strip 20 comprises, in addition to the first damping elements 32, further damping elements 32b, which are arranged horizontally in a mirror image and are also provided in the longitudinal groove 30 in the area of ​​the head section 28. The further damping elements 32b, like the first damping elements 32, have a strip-like shape and are, for example, also formed on the head section 28 with one of their longitudinal surfaces.

[0036] The additional damping elements 32b are arranged in the area of ​​the longitudinal grooves 30 such that they are positioned on a side boundary surface of the longitudinal groove 30, which is opposite another side boundary surface to which the first damping elements 32 are attached. This facilitates the insertion of a spring rail 42 into the longitudinal grooves 30 of the wiper strip 20. Furthermore, the additional damping elements 32b are positioned relative to the head section 28 such that their terminal free portion, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30.

[0037] Furthermore, the additional damping elements 32b are also designed on the head part 28 in such a way that further gaps 34a are formed between them and the material of the head part 28, facing away from the longitudinal grooves 30, with the gap width of the further gaps 34a increasing or widening in the direction of the free ends of the further damping elements 32b.

[0038] The other damping elements 32b are, for example, made of a comparable rubber material as the first damping elements 32.

[0039] This further reduces possible folding noises of the wiper blade at the reversal point between two wiping movements and at the same time allows for simplified insertion of the spring rails 14 into the longitudinal grooves 30 of the head part 28.

[0040] In Figure 7 A wiper strip according to a fourth embodiment of the present invention is shown schematically.

[0041] The in Figure 7The illustrated wiper strip 20 comprises, in addition to the first damping elements 32, further damping elements 32b, which are arranged horizontally in a mirror image and are also provided in the longitudinal groove 30 in the area of ​​the head section 28. The further damping elements 32b, like the first damping elements 32, have a strip-like shape and are, for example, also formed against the head section 28 with one of their longitudinal surfaces. Furthermore, the further damping elements 32b are positioned relative to the head section 28 such that their terminal free portion, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30.

[0042] In contrast to the one in Figure 6 In the embodiment shown, the additional damping elements 32b are compared with the additional damping elements 32b according to Figure 6arranged in opposite directions or with their free part facing the central area of ​​the head section 28.

[0043] The additional damping elements 32b are designed on the head part 28 in such a way that further gaps 34a are formed between them and the material of the head part 28 facing the bottom of the longitudinal grooves 30, with the gap width of the further gaps 34a increasing or widening in the direction of the free ends of the further damping elements 32b.

[0044] In Figure 8 A wiper strip according to a fifth embodiment of the present invention is shown schematically.

[0045] The in Figure 8The wiper strip 20 shown comprises, in addition to the first damping elements 32, further damping elements 32b, which are arranged in the area of ​​the longitudinal grooves 30 such that they are positioned on a side boundary surface of the longitudinal groove 30, opposite another side boundary surface to which the first damping elements 32 are attached. The further damping elements 32b are, for example, designed as projections that narrow the cross-section of the longitudinal groove. This also facilitates the simplified insertion of a spring rail 42 into the longitudinal grooves 30 of the wiper strip 20.

[0046] In Figure 9 A wiper strip according to a sixth embodiment of the present invention is shown schematically.

[0047] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 2In the first embodiment shown, first damping elements 32 are formed on opposite sides of the head part 28 in the area of ​​the longitudinal grooves 30, but on opposite side boundary surfaces of the longitudinal grooves 30 compared to the embodiment according to Figure 2 The first damping elements 32, for example, also have a strip-shaped form and are, for example, integrally formed with one of their longitudinal surfaces against the head section 28. Furthermore, the first damping elements 32 are positioned relative to the head section 28 such that their terminal free portion, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30.

[0048] Furthermore, the first damping elements 32 are also designed on the head part 28 in such a way that gaps 34 are formed between them and the material of the head part 28 facing away from the longitudinal grooves 30, with the gap width of the gaps 34 increasing or widening in the direction of the free ends of the first damping elements 32.

[0049] In Figure 10 A wiper strip according to a seventh embodiment of the present invention is shown schematically.

[0050] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 2In the first embodiment shown, additional damping elements 32 are formed on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30. These first damping elements 32 also have, for example, a strip-shaped form and are integrally formed with the head section 28 with one of their longitudinal surfaces. Furthermore, the first damping elements 32 are positioned relative to the head section 28 such that their terminal free portion, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30. However, this is done differently here compared to the embodiment according to [reference missing]. Figure 2 in a contrary manner, by orienting the free parts or ends of the first damping elements 32 towards the center of the wiper strip.

[0051] In Figure 11 A wiper strip according to an eighth embodiment of the present invention is shown schematically.

[0052] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 9 In the sixth embodiment shown, first damping elements 32 are located on opposite sides of the head part 28 in the area of ​​the longitudinal grooves 30 on side boundary surfaces of the longitudinal grooves 30 according to Figure 9 are formed. Furthermore, the first damping elements 32 are analogous to those in Figure 10 The seventh embodiment shown is oriented with its free parts towards the center of the wiper strip 20.

[0053] In Figure 12 A wiper strip according to a ninth embodiment of the present invention is shown schematically.

[0054] The head section 28 of the wiper strip 20 comprises first damping elements 32, 32b which, in combination with embodiments seven and eight, are arranged on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30 and on both sides on opposite side boundary surfaces of the longitudinal grooves 30 and are oriented with their free parts towards the center of the wiper strip 20.

[0055] In Figure 13 A wiper strip according to a tenth embodiment of the present invention is shown schematically.

[0056] The head section 28 of the wiper strip 20 comprises first damping elements 32, 32b which, in combination with embodiments six and seven, are arranged on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30 and on both sides on opposite side boundary surfaces of the longitudinal grooves 30.

[0057] In Figure 14A wiper strip according to an eleventh embodiment of the present invention is shown schematically.

[0058] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 2 In the illustrated first embodiment, first damping elements 32 are formed on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30. These first damping elements 32 have, for example, a double strip-shaped form and are integrally formed with the head section 28 with one of their longitudinal surfaces. Furthermore, the first damping elements 32 are positioned relative to the head section 28 such that their two terminal free parts or ends, facing away from the head section 28, reduce, narrow, or taper the clear cross-section of the longitudinal grooves 30.

[0059] In Figure 15 A wiper strip according to a twelfth embodiment of the present invention is shown schematically.

[0060] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 14 In the eleventh embodiment shown, first damping elements 32 are formed on opposite sides of the head part 28 in the area of ​​the longitudinal grooves 30, but on opposite side boundary surfaces of the longitudinal grooves 30 compared to the embodiment according to Figure 14 The first damping elements 32, for example, also have a double strip-shaped form and are, for instance, integrally formed with one of their longitudinal surfaces against the head section 28. Furthermore, the first damping elements 32 are positioned relative to the head section 28 such that their two terminal free parts or ends, facing away from the head section 28, reduce, narrow, or taper the clear cross-section of the longitudinal grooves 30.

[0061] In Figure 16 A wiper strip according to a thirteenth embodiment of the present invention is shown schematically.

[0062] The head section 28 of the wiper strip 20 comprises first damping elements 32, 32b which, in combination of embodiments eleven and twelve, are arranged on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30 and on both sides on opposite side boundary surfaces of the longitudinal grooves 30.

[0063] In Figure 17 A wiper strip according to a fourteenth embodiment of the present invention is shown schematically.

[0064] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 2In the first embodiment shown, first damping elements 32 are formed on opposite sides of the head part 28 in the area of ​​the longitudinal grooves 30. These first damping elements 32 also have, for example, a strip-shaped form and are integrally formed with the head part 28 with one of their longitudinal surfaces. Furthermore, the first damping elements 32 are positioned relative to the head part 28 such that their terminal free portion, facing away from the head part 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30. The first damping elements 32 are designed such that, in those areas where a spring strip 42 comes into surface contact with the spring strip 42 when it is inserted into the longitudinal grooves 30 of the wiper strip 20, they have a flattened area 38 facing the spring strip 42, which preferably rests flat against the surface of a spring strip 42 to be inserted or already inserted.This embodiment ensures particularly effective suppression of the wiper strip 20's folding noise during subsequent operation.

[0065] In Figure 18 A wiper strip according to a fifteenth embodiment of the present invention is shown schematically.

[0066] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 17In the illustrated fourteenth embodiment, first damping elements 32 are formed on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30. These first damping elements 32 also have, for example, a strip-shaped form and are integrally formed with the head section 28 with one of their longitudinal surfaces. Furthermore, the first damping elements 32 are positioned relative to the head section 28 such that their terminal free portion, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30.The first damping elements 32 are designed such that, in those areas where a spring strip 42 comes into surface contact with the longitudinal grooves 30 of the wiper strip 20, they have a curved area 39 facing the spring strip 42, which preferably lies flat against the surface of a spring strip 42 to be inserted or already inserted. This embodiment also ensures particularly effective suppression of the wiper strip 20's movement noise during subsequent operation.

[0067] In Figure 19 A wiper strip according to a sixteenth embodiment of the present invention is shown schematically.

[0068] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 2In the first embodiment shown, first damping elements 32 are formed on opposite sides of the head section 28 in the area of ​​the longitudinal grooves 30. These first damping elements 32 also have, for example, a strip-shaped form and are integrally formed with the head section 28 with one of their longitudinal surfaces. Furthermore, the first damping elements 32 are positioned relative to the head section 28 such that their terminal free portion, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30. The first damping elements 32 are designed such that their free portions or ends have a chamfered profile 50, which, when a spring strip 42 is inserted into the longitudinal grooves 30 of the wiper strip 20, comes into surface contact with the spring strip 42 and preferably rests flat against the surface of a spring strip 42 to be inserted or already inserted.This embodiment also ensures particularly effective suppression of the wiper strip 20's folding noise during subsequent operation.

[0069] In Figure 20 A wiper strip according to a seventeenth embodiment of the present invention is shown schematically.

[0070] The head section 28 of the wiper strip 20 comprises, as in the case of the Figure 2In the first embodiment shown, first damping elements 32 are formed on opposite sides of the head section 28 in the region of the longitudinal grooves 30. These first damping elements 32 are, for example, designed as hollow profiles 41 with a rhombus-shaped cross-section and are integrally formed with the head section 28, for example, in the region of a longitudinal edge. Furthermore, the first damping elements 32 are positioned relative to the head section 28 such that their terminal free longitudinal edge, facing away from the head section 28, reduces, narrows, or tapers the clear cross-section of the longitudinal grooves 30.

Claims

1. Wiper strip comprising a wiping wedge (22), on which a wiper lip (24) is formed, and a head part (28), which is connected via a tilting web (26) to the wiping wedge (22) and which in each case has a longitudinal groove (30) on two opposite sides of the head part (28) for engagement of a spring rail (42) in the head part (28) of the wiper strip (20), characterized in that the head part (28) further comprises at least one damping element (32, 32b) which, with at least one free end, tapers the cross section of one of the longitudinal grooves (30).

2. Wiper strip according to Claim 1, characterized in that a damping element (32, 32b) is provided on both sides of the head part (28) of the wiper strip (20).

3. Wiper strip according to Claim 1 or 2, characterized in that the at least one damping element (32, 32b), with its free end, tapers the cross section of one of the longitudinal grooves (30), thus forming a gap (34a) between the head part (28) and a large area of the free end of the damping element (32, 32b) facing away from the respective longitudinal groove (30).

4. Wiper strip according to any one of the preceding claims, characterized in that at least one first damping element (32, 32b) is positioned on a first side boundary surface of the longitudinal groove (30) and, with its free end, tapers the cross section of the longitudinal groove (30), and in that at least one further damping element (32b) is also provided, which is positioned on a second side boundary surface of the longitudinal groove (30) opposite the first side boundary surface and which, with its free end, tapers the cross section of the same longitudinal groove (30).

5. Wiper strip according to Claim 4, characterized in that the free end of the further damping element (32b) tapers the cross section of the longitudinal groove (30) in the opposite direction with respect to the free end of the first damping element (32).

6. Wiper strip according to any one of the preceding claims, characterized in that the damping element (32, 32b) has a curved or flattened cross section (38, 39) in a region which comes into contact with a spring rail (42) to be introduced into the longitudinal groove (30).

7. Wiper strip according to any one of the preceding claims, characterized in that a further damping element (32a) is arranged between the wiping wedge (22) and the head part (28), wherein a distance between the further damping element (32a) and the head part (28) increases in the direction towards a free end of the further damping element (32a).

8. Wiper strip according to any one of the preceding claims, characterized in that the head part (28) and the damping element (32, 32a, 32b) have different types of rubber with differing elastic behaviour.

9. Wiper strip according to any one of the preceding claims, characterized in that the damping element (32, 32a, 32b) is at least partially made of a porous rubber material.

10. Wiper strip according to any one of the preceding claims, characterized in that the damping element (32, 32a, 32b) is made of the same rubber material as the wiping wedge (22), the wiper lip (24) and / or the tilting web (26) of the wiper strip (20).

11. Wiper strip according to any one of Claims 1 to 7, characterized in that the damping element (32, 32a, 32b) is made of the same type of rubber, but with a different Shore hardness compared to the head part (28) of the wiper strip (20).

12. Wiper blade containing 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 of a wiper blade according to Claim 12 for cleaning vehicle windows or stationary building glazing and also sensor surfaces.