Windscreen wiper blade with shock-absorbing element

Abstract

TITLE: Wiper blade with damping element. Wiper blade (10) comprising a flexible rail (17) and a wiper blade unit (11) with a wiping lip (12) and a base body (14) for receiving the flexible rail (17). The wiper blade unit (11) includes a damping element (40). Figure 2

Description

Title of the invention: Windshield wiper blade with shock-absorbing element. FIELD OF THE INVENTION

[0001] The present invention relates to a windshield wiper blade comprising an elastic rail and a wiping blade unit with a wiping lip and a base body having an elastic rail housing. STATE OF THE ART

[0002] Such a windshield wiper blade is already known.

[0003] DESCRIPTION AND ADVANTAGES OF THE INVENTION

[0004] The present invention relates to a windshield wiper blade comprising at least one elastic rail and at least one wiping blade unit with at least one wiping lip and at least one base body for receiving the elastic rail, this windshield wiper blade being characterized in that the wiping blade unit includes a shock-absorbing element.

[0005] Preferably, the term "wiper blade unit" designates at least one part, in particular a subassembly, of a wiper blade. The wiper blade unit is designed to wipe a surface, in particular a vehicle window, specifically to clean that surface and remove liquid from it. The wiper blade unit is in direct contact with the surface to be cleaned, in particular the vehicle window. The wiper blade unit is attached to a vehicle. The wiper unit is specifically intended for a vehicle window such as a windshield, a rear window, or a headlight lens. The wiper blade unit preferably comprises at least one base body and one wiping lip.

[0006] During operation of the wiper blade unit, the wiping lip is designed to be in direct contact with the surface, in particular the vehicle's window. The wiping lip is designed to be applied under the effect of a force, for example, exerted by an elastic rail of the wiper blade against the shape of the surface. The wiping lip is preferably made of a natural or synthetic elastomer, in particular a plastic or rubber. Preferably, the wiping lip is supported by the base body, in particular being formed as a single piece with it. The wiping lip extends at least practically parallel to the main direction of extension of the wiper blade unit.

[0007] The expression "principal direction of extension" of an object refers to the direction parallel to the direction of the longest side of the smallest parallelepiped that tightly encloses the object. This direction deviates from the reference direction by only a difference, in particular less than 8°, advantageously less than 5° and in a particularly advantageous way, less than 2°.

[0008] The elastic spring element of the wiper blade unit can also be mounted on the elastic rail. Alternatively, the elastic spring element can be mounted on the elastic rail or bonded to the elastic rail. In another embodiment, the elastic spring element is formed by a coating on the elastic rail.

[0009] The base body of the wiper blade unit is designed to mold the wiper blade unit onto other wiper blade components. These other wiper blade components are, for example, at least one of the following: elastic rail, end cap, deflector, fastening element, wiper arm adapter. The base body is designed to receive at least part of the elastic rail. The base body has an elastic rail bearing surface. The elastic rail bearing surface is designed to be pressed against the elastic rail. The elastic rail bearing surface is preferably part of the elastic rail housing. The elastic rail housing is made as a recess complementary to the elastic rail. In particular, the elastic rail housing is in the form of a passage or groove in the base body.The main extension direction of the elastic rail housing is at least practically parallel to the main extension direction of the base body or wiper blade unit.

[0010] In particular, the base body is designed to receive at least part of the elastic rail. The base body has an elastic rail bearing surface. This elastic rail bearing surface is preferably designed to press against the elastic rail. The elastic rail bearing surface is preferably part of the elastic rail housing. The elastic rail housing is a cavity with a shape complementary to that of the elastic rail. In particular, the elastic rail housing is a passage or groove in the base body. This cavity is preferably oriented along the principal extension direction of the elastic rail housing, being at least practically parallel to the principal extension direction of the base body or the wiper blade unit.

[0011] The expression "principal direction of extension of a housing or recess" refers in particular to the principal direction of extension of a wall delimiting the housing or recess, especially by a theoretically infinitely thin wall thickness. The base body, at least in the operating state of the wiper blade unit, is not in contact with the surface, particularly the vehicle window. Preferably, the wiper base body is made of a natural or synthetic elastomer, in particular, plastic or rubber.

[0012] It should be noted that in the description and the claims the conjunction "or" has the usual double logical function, namely, the function of "inclusive or" and that of "exclusive or".

[0013] Preferably, the wiping lip and the base body are made of the same material. The wiping lip is preferably connected to the base body. The wiping lip is thus formed as a single piece with the base body. The shock-absorbing element is made separately from the base body. The expression "as a single piece" means that it is made in one piece or joined by a material such as, for example, by a welding or bonding process or otherwise, and, in a particularly advantageous manner, by shaping it through manufacturing from a cast part or by manufacturing it by a one- or multi-component injection molding process. The expression "as a single piece" means "formed in one piece".Preferably, this part is obtained from a single blank, mass or casting and, particularly preferably, obtained by an injection process, in particular an injection process with one or more components.

[0014] According to an advantageous development of the invention, the main extension direction of the base body is at least practically parallel to the main extension direction of the wiping lip or the wiping blade unit. The damping element is on the base body. The damping element is preferably located in the elastic rail housing of the base body.

[0015] The term "dampening element" in the context of the present invention refers to an element having a modulus of elasticity E that is 10 GPa, or in particular 100 GPa, lower than that of the base body. Such a damping element is advantageously designed to provide compensation in the longitudinal direction so that noise is advantageously reduced during a regular wiping motion beyond the reversal points. In particular, the wiping blade unit is advantageously deformable in a simple manner during its wiping motion. In particular, the wiping blade unit performs particularly quiet wiping motions.

[0016] According to an advantageous development, the damping element is made of polyurethane foam, in particular, a flexible polyurethane foam. A wiper blade with a polyurethane foam damping element allows for particularly economical manufacturing. Furthermore, a flexible polyurethane foam has optimal damping and decoupling properties.

[0017] The flexible polyurethane foams concerned by the present invention have a structure that is at least partially open-cell, obtained through gas inclusions developed during the manufacturing process. The production of the shock-absorbing element from flexible polyurethane foam makes it possible to significantly reduce the noise generated by comparison with known windshield wiper blades according to the state of the art.

[0018] According to a particularly advantageous embodiment of the invention, the foam according to ISO 845 has a density of between 100 kg / m³ and 400 kg / m³, preferably between 150 kg / m³ and 350 kg / m³, and preferably between 200 kg / m³ and 300 kg / m³, and particularly preferably between 200 kg / m³ and 260 kg / m³. The density is thus lower by a multiple of the density of the base body made of EPDM rubber.

[0019] In a particularly simple and advantageous manner, the damping element is made in a large and, in particular, practically complete part of an expanded material. Preferably, each damping segment is practically in one piece.

[0020] According to an advantageous development of the invention, the elastic rail bearing surface forms at least partially an elastic rail housing. According to an advantageous development of the invention, the base body is a longitudinal cavity distinct from the elastic rail housing and closed at its periphery.

[0021] The longitudinal cavity extends at least practically parallel to the principal direction of extension of the wiper blade unit, in particular the base body. The maximum extension of the longitudinal cavity in the principal direction of extension of the wiper blade unit corresponds at least partially to the maximum extension of the wiper unit, in particular the wiper base body. Furthermore, the fact that two quantities "practically correspond" means that the smallest ratio formed between the two quantities is at least greater than 0.25, preferably greater than 0.5, and most preferably greater than 0.75. The longitudinal cavity is at least practically parallel to the principal direction of extension of the elastic rail housing. The longitudinal cavity is practically parallel to the principal direction of extension of the wiper lip.The expression "peripheral direction" refers in particular to a plane that is practically perpendicular to the main direction of extension of the wiping blade unit.

[0022] The expression "practically perpendicular" refers to the orientation of a direction with respect to a reference direction; this direction and the reference direction considered in a plane forming an angle of 90° between them with a maximum deviation of less than 8°, advantageously less than 5° and, in a particularly advantageous manner, less than 2°.

[0023] The wiping lip defines the longitudinal cavity. The longitudinal cavity is advantageously elastic in the vertical direction. Preferably, the damping element is made separately from the longitudinal cavity. The longitudinal cavity allows for deformation during the wiping movement.

[0024] According to an advantageous embodiment of the invention, the wiper blade has a cover element on the side opposite the wiping lip, in particular a deflector; the cover element surrounds the base body. The cover element may be in the form of a deflector element. The deflector element deflects the wind and generates an application force. According to an advantageous embodiment, the cover element is in two parts, comprising a first deflector element and a second element also in the form of a deflector element. Each deflector element preferably occupies half of the wiper blade's extension.

[0025] According to an advantageous development of the invention, the cover element forms the receiving housing for the elastic rail, or elastic rail housing. The cover element is part of the elastic rail housing. The base body and the cover element together form the elastic rail housing. The damping element is located within the elastic rail housing thus formed. The cover element preferably has two side walls that practically completely cover the longitudinal cavity. The cover element may be an extruded piece. The elasticity of the cover element is preferably lower than that of the wiper rubber. The cover element surrounds the base body. In the context of the present invention, the term "surrounds" means "at least partially encloses the base body in all spatial directions."The cover element has one side facing the surface to be wiped, equipped with an opening through which the wiping lip passes.

[0026] According to one characteristic, the damping element has a first damping segment and a second damping segment. The damping segments are preferably made separately from each other. The damping segments are of congruent shape, in particular practically identical. The damping segments are each in one piece. The damping segments extend practically over the entire longitudinal length of the wiping blade.

[0027] The damping segments of the damping element are in the form of flat beam elements, with a practically rectangular cross-section and extending flat in the longitudinal direction. The damping segments are planar symmetrical with respect to the axis of symmetry. Preferably, the damping elements have a thickness that is on the order of magnitude of the thickness of the elastic rail.

[0028] According to an advantageous development of the invention, the base body has at least two channel walls surrounding the longitudinal cavity. The longitudinal channel is practically rectangular in shape. The longitudinal cavity is connected by a relatively narrow connecting spacer to the wiping lip. The channel walls are made of the same material as the wiping lip of the wiping blade unit. Alternatively, channel walls made of another material, in particular a The material used is not elastic, but rather elastic, like that of the wiping lip of the wiping blade unit. Preferably, the channel walls define, at least partially, a longitudinal cavity, particularly in a direction practically parallel to the wiping direction. The channel walls are symmetrical with respect to each other, especially with respect to the principal extension direction of the base body.

[0029] According to an advantageous development of the invention, the elastic rail has a first elastic rail segment and a second elastic rail segment.

[0030] According to an advantageous development of the invention, at least the wiping lip has a maximum extension parallel to the wiping direction and which represents at least one-tenth, in particular at least one-fifth, of the maximum extension of the wiper blade body parallel to the wiping direction. Advantageously, the wiping lip is solid. In particular, the wiping lip is stable and movable, designed to remove, by wiping, large deposits from the surface, particularly the vehicle window. The stable and movable wiping lip thus makes it possible to remove, by wiping, stubborn dirt adhering to the surface of the vehicle window.

[0031] According to another feature, the wiping lip has a practically triangular cross-section. The expression "practically triangular cross-section" means that the smallest theoretical triangle that completely encloses the cross-section has a surface area that is at most 125%, preferably at most 115%, and most preferably at most 105% of the surface area of ​​the actual cross-section. Alternatively, or in addition, the largest theoretical triangle that can be inscribed within the cross-section has a surface area that corresponds to at least 75%, preferably at least 85%, and most preferably at least 95% of the surface area of ​​the actual cross-section. In particular, the practically triangular cross-section can be envisaged to have, instead of a corner (or vertex) of the triangle, a contact surface for making contact with the surface to be cleaned. Brief description of the drawings

[0032] The present invention will be described in more detail below with reference to an embodiment of a windshield wiper blade schematically represented in the accompanying drawings in which:

[0033] [Fig. 1] Schematic perspective view of a windshield wiper with a wiping blade unit according to the invention,

[0034] [Fig.2] Schematic cross-sectional view of a first embodiment of a windshield wiper blade according to the invention.

[0035] DESCRIPTION OF EMBODIMENT METHODS OF THE INVENTION

[0036] [Fig. 1] shows a wiper blade 10. The wiper blade 10 comprises at least one elastic rail 17 (see [Fig. 2]). The wiper blade 10 comprises at least A wiper blade unit 11. The wiper blade unit 11 preferably has a longitudinal direction 50 as the direction of its main extension. In particular, the longitudinal direction 50 is practically parallel to the main extension direction of the wiper arm 10. The longitudinal direction 50 is at least practically perpendicular to the wiping direction 30a, 32a of the wiper arm 10, particularly of the wiper blade unit 11. Preferably, the wiper arm 10 includes end caps 42, 44 (not detailed). The wiper arm 10 also includes a wiper arm adapter 46.

[0037] Figure 2 shows a section of the wiper blade 10, particularly in the cutting plane 52 (see Figure 1), which is at least practically perpendicular to the longitudinal direction 50. The section of the wiper blade 10 has an axis of symmetry 102 that is at least practically perpendicular to the wiping direction 30a, 32a and, in particular, at least practically parallel to the longitudinal direction 50. The section of the wiper blade unit 11 is planar symmetric with respect to the axis of symmetry 102. The wiper blade unit 11 comprises at least one wiping lip 12. The wiping lip 12 lies on the axis of symmetry 102. In particular, the principal extension direction of the wiping lip 12 is at least practically parallel to axis of symmetry 101.

[0038] The wiping lip 12 is symmetric-planar with respect to the axis of symmetry 102. The wiping blade unit 11 comprises at least one base body 14. The wiping lip 12 is on the base body 14. Preferably, the base body 14 is symmetric-planar with respect to the axis of symmetry 102. In particular, and in a particularly preferred manner, the principal extension direction of the base body 14 is at least practically parallel to the axis of symmetry 102. The base body 14 comprises an elastic rail bearing surface 16. The elastic rail bearing surface 16 receives the elastic rail 17.

[0039] According to the embodiment of the invention shown in [Fig. 2], the elastic rail 17 is made in two parts; it comprises a first segment of elastic rail 17a and a second segment of elastic rail 17b. The segments 17a, 17b of the elastic rail are, according to the embodiment of [Fig. 2], in contact with the bearing or contact surface of the elastic rail 16a.

[0040] The contact surface of the elastic rail 16a is preferably part of an elastic rail housing 15. The elastic rail housing 15 differs, at least in part, from the elastic rail segments 17a, 17b. Preferably, the elastic rail segments 17a, 17b are surrounded by the cover element 100, common with the elastic rail housing 15; preferably they are completely surrounded.

[0041] Embodiments can be envisaged in which the elastic rail housing 15 is closed in the peripheral direction. It is also possible to consider that a single elastic rail 17. According to an advantageous development the maximum extension of the elastic rail housing 15 corresponds at least in essence to the maximum extension of the wiping blade unit 11 in a direction practically parallel to the wiping direction 30a, 32a.

[0042] The elastic rail segments 17a, 17b extend practically parallel to the wiping direction 30a, 32a. Preferably, the elastic rail support surface 16a, 16b, which is also preferably made in two parts, can be practically parallel to the wiping direction 30a, 32a. Particularly preferably, the extension of the elastic rail installation 16a, 16b in the wiping direction 30a, 32a corresponds practically to the extension of the elastic rail segments 17a, 17b in that direction.

[0043] The base body 14 comprises at least one longitudinal cavity 18. The longitudinal cavity 18 does not have a differently constructed housing for the elastic rail 15. The elastic rail bearing surfaces 16a, 16b may be the outer wall of the longitudinal cavity 18. The elongated cavity 18 is preferably closed in the peripheral direction. The wiping lip 12 is provided on the longitudinal cavity 18.

[0044] The wiping base body 14 comprises at least two cavity walls 22a, 24a peripherally surrounding the longitudinal cavity 18. Preferably, the cavity walls 22, 24 have the same shape. In particular, the cavity walls 22, 24 together form the complete wall of the cavity. The two cavity walls 22, 24 are planar symmetrical with respect to each other, in particular, with respect to the axis of symmetry 102. Preferably, the wiping lip 12 is outside the longitudinal cavity 18. Preferably, the wiping lip 12 has a practically triangular shape.

[0045] The wiping lip 12 can be made of a solid material or also with the wiping lip 12 having additional recesses in the direction transverse to the axis of symmetry 12. The longitudinal cavity 18 and the sealing lip 12 are connected to each other by a relatively narrow connecting spacer 34. Both the longitudinal cavity 18 and the wiping lip 12 are symmetrical with respect to the axis of symmetry 102.

[0046] According to the embodiment shown in [Fig. 2], the longitudinal cavity 18 has a practically rectangular shape. However, other cavity shapes can also be considered insofar as they allow for compensation in the longitudinal direction. The wiping lip 12 is preferably in contact with the surface to be cleaned by its end opposite the cavity. The wiping lip 12 is oriented practically perpendicular to the wiping direction 30a, 32a.

[0047] According to the embodiment of the invention shown in [Fig. 2], the wiper blade unit 11 comprises the wiper lip 12, the connecting spacer 34, and the base body 14, all made in one piece from wiper rubber. The wiper blade unit 11 is preferably extruded from EPDM rubber. This is achieved using a co-extrusion process; alternatively, however, only one type of plastic may be used. A preferred embodiment of the invention provides that the wiping lip 12 is made of a more flexible EPDM rubber than the remaining part of the wiping blade unit 11. The longitudinal cavity 18 may also be more rigid than the wiping lip 12. The longitudinal cavity 18 has a higher damping coefficient than that of the wiping lip 125.The elastic rail housing 15 is made of a shape-stable plastic material, which allows for particularly stable bearing surfaces for elastic rail 16a, 16b.

[0048] According to the embodiment of the invention shown in [Fig. 2], the longitudinal cavity 18 follows the elastic rail housing 15. The elastic rail housing 15 has a practically T-shaped segment and elastic rail bearing surfaces 16a, 16b. The T-shaped segment comprises the upper cross member 126 and the arm 128. The arm 128, bearing against the longitudinal cavity 18 and thus against the elastic rail bearing surfaces 16a, 16b formed by the upper wall of the longitudinal cavity 18 and the cross member 126, creates in cross-section an elastic rail housing in the form of a retaining groove. The elastic rail housings 16a, 16b are provided to receive a first elastic rail segment 17a and, correspondingly, a second elastic rail segment 17b.The length of the connecting spacer 128 corresponds substantially to the thickness of the first elastic rail segment 17a or the second elastic rail segment 17b so that the wiper blade unit 11 is held securely in the vertical direction between the first elastic rail segment 17a and the second elastic rail segment 17b.

[0049] The hollow volume of the longitudinal cavity 18 can be filled at atmospheric pressure, with a particular gas or alternatively with compressed air.

[0050] The side of the wiping blade unit 11 opposite the wiping lip 12 comprises a cover element 100. The cover element 100 is preferably in the form of a deflector. The cover element 100 comprises two side walls 104a, 104b. The side walls 104a, 104b are directed practically in the direction of the axis of symmetry 102. The side walls 104a, 104b preferably cover the entire height of the longitudinal cavity 18a. The side walls 104a, 104b preferably each continue as a contour 105a, 105b. Contour 105a, 105b is a relief that extends practically in the direction of wiping on the corresponding side wall 104a, 104b. Contour 104a, 105b thus extends, preferably, in the direction of the elastic rail segments 17a, 17b. Contour 105a, 105b is preferably located in contact with the lower wall of the base body 14, of the longitudinal cavity 18.

[0051] As is clearly shown in [Fig. 2], the wiping blade unit 11 has a damping element 40. According to the embodiment of the invention shown in [Fig. 2], the damping element 40 is made of an expanded elastomer. The damping element is characterized in particular as having a modulus of elasticity E that is 10 GPa lower, in particular 100 GPa lower, than the modulus of elasticity of the base body 14. Such a damping effect can also be achieved by creating a set of structures with holes or inclusions in a damping element body made of a solid material.

[0052] The damping element 40 preferably comprises a first damping segment 40a and a second damping segment 40b. The damping element 40 is preferably formed separately from the base body 14. Each damping segment 40a, 40b has a practically homogeneous network structure.

[0053] The damping element 40, despite the strong pressure exerted by the base body on the elastic rail by the enveloping cover element during the wiping movement, provides compensation in the longitudinal direction beyond the points of reversal. The strong pressure of the base body against the elastic rail simultaneously prevents any unintentional disengagement of the base body or the elastic rail housing from the elastic rail, thus avoiding folding noises.

[0054] The damping element composed of the damping segments 40a, 40b shown in [Fig. 2] can be made, for example, of a polyurethane foam having an open-cell structure. Plastic foam, such as flexible polyurethane foam, can have a practically homogeneous network in both the longitudinal and perpendicular directions. Flexible polyurethane foam is particularly suitable, thanks to its homogeneous network structure, for damping throughout the entire wiping motion. Depending on the desired damping function, a closed-cell or closed-cell foam structure with a similarly homogeneous distribution of pores and cavities can also be considered.

[0055] The expanded material, according to ISO 8465, has a density between 100 kg / m³ and 400 kg / m³, preferably between 150 kg / m³ and 350 kg / m³, and in particular, preferably between 200 kg / m³ and 300 kg / m³, and most preferably between 220 kg / m³ and 260 kg / m³. The density is less than a multiple of that of EPDM rubber. Despite the costly processing of PUR polyurethane foams, the shock-absorbing element 40 can be manufactured economically thanks to its very simple geometric shape.

[0056] The damping element 40 is made as an elastic support structure between the elastic rail 17 and the base body 14. The damping segments 40a, 40b extend, preferably, in the wiping direction 30a, 32a. Preferably, the damping segments 40a, 40b cover the elastic rail segments 17a, 17b practically at least in part.

[0057] The shock-absorbing segments 40a, 40b are flat, beam-shaped elements. The shock-absorbing segments extend practically over the entire longitudinal coverage of the wiper blade 10. The shock-absorbing segments 40a, 40b are, respectively, in contact with the elastic rail bearing surfaces 16a, 16b of the base body 14 and the elastic rail.

[0058] Advantageously, the shock-absorbing element 40 comprises a foam material, preferably an expanded material and, particularly preferably, an expanded elastomer.

[0059] According to another characteristic, the expanded material is a polyurethane foam, in particular a flexible polyurethane foam.

[0060] According to another characteristic, the material expanded according to ISO 845 has a density between 100 kg / m3 and 400 kg / m3 preferably between 150 kg / m3 and 350 kg / m3 and preferably between 200 kg / m3 and 300 kg / m3 and particularly preferably between 200 kg / m3 and 260 kg / m3.

[0061] According to another feature, the shock-absorbing element has a first shock-absorbing segment and a second shock-absorbing segment, and preferably the shock-absorbing segments are made respectively in one piece, preferably in one piece.

[0062] According to another feature, the damping element 40 is a separate component from the base body 14, in particular, the damping element 40 is made as a covering for the elastic rail 17.

[0063] According to another characteristic, the damping element is a surface element, in particular a flat beam-shaped element.

[0064] According to another feature, the wiper blade includes a cover element, in particular a deflector on the side opposite to that of the wiping lip, this cover element surrounding the basic body, in particular the longitudinal cavity.

[0065] According to another feature, the damping element is applied against the side of the elastic rail 17 turned towards the wiping lip 12.

[0066] According to another feature, the base body comprises at least two cavity walls surrounding the longitudinal cavity, the cover element practically surrounds the cavity walls.

[0067] According to another feature, the damping element 40 is applied in contact against the elastic rail 17.

[0068]

[0069] NOMENCLATURE OF MAIN COMPONENTS (unless otherwise specified, numerical references are without alphabetical suffixes)

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

[0083]

[0084]

[0085]

[0086]

[0087]

[0088]

[0089]

[0090]

[0091] 10 Wiper blade 11 Wiper blade unit 12 Wiper lip 14 Base body 15 Elastic rail housing 16 Elastic rail bearing surface 17 Elastic rail 17a,b Elastic rail segment 18 Longitudinal cavity 22 Cavity wall 24 Cavity wall 30 Wiping direction 32 Wiping direction 40 Damper element 40a,b Damper segment 42 End cap 44 End cap 46 Wiper arm adapter 50 Longitudinal direction of the wiper blade unit 52 Cutting plane 102 Axis of symmetry 105 Contour

Claims

Demands

1. Wiper blade (10) comprising at least one elastic rail (17) and at least one wiper blade unit (11) with at least one wiper lip (12) and at least one base body (14) for receiving the elastic rail (17), the wiper blade unit (11) comprising a damping element (40), wiper blade characterized in that the damping element (40) has a modulus of elasticity E smaller by a coefficient 10 GPa, in particular, by a coefficient 100 GPa than that of the base body.

2. Wiper blade (10) according to claim 1, characterized in that the damping element (40) comprises a foam material, preferably an expanded material and, in a particularly preferred manner, an expanded elastomer.

3. Wiper blade (10) according to claim 2, characterized in that the expanded material is a polyurethane foam, in particular a flexible polyurethane foam.

4. Wiper blade (10) according to claim 2, characterized in that the material expanded according to ISO 845 has a density between 100 kg / m3 and 400 kg / m3 preferably between 150 kg / m3 and 350 kg / m3 and preferably between 200 kg / m3 and 300 kg / m3 and particularly preferably between 200 kg / m3 and 260 kg / m3.

5. Wiper blade (10) according to any one of the preceding claims, characterized in that the damping element (40) is made, mainly in large part, in particular practically completely, of an expanded material.

6. Wiper blade (10) according to any one of the preceding claims, characterized in that the damping element (40) has a first damping segment (40a) and a second damping segment (40b), and preferably the damping segments (40a, 40b) are made respectively in one piece, preferably in one piece.

7. Wiper blade (10) according to any one of the preceding claims, characterized in that the damping element (40) is applied in contact against the elastic rail (17).

8. Wiper blade (10) according to any one of the preceding claims, characterized in that the damping element (40) is a separate component from the base body (14), in particular the damping element (40) is made as a coating of the elastic rail (17).

9. Wiper blade (10) according to any one of the preceding claims, characterized in that the basic body (14) has a longitudinal cavity (18) closed in the peripheral direction and different from an elastic rail housing (15).

10. Wiper blade (10) according to any one of the preceding claims, characterized in that the damping element (40) is a surface element, in particular a flat beam-shaped element.

11. Wiper blade (10) according to any one of the preceding claims, characterized in that the wiper blade (10) comprises a cover element (100), in particular a deflector on the side opposite to that of the wiping lip (12a), this cover element (100) surrounding the base body (14), in particular the longitudinal cavity (18).

12. Wiper blade (10) according to any one of the preceding claims, characterized in that the damping element (40) is provided on the base body (14), in particular in the elastic rail housing (15) of the base body (14).

13. Wiper blade (10) according to any one of the preceding claims, characterized in that the elastic rail (17) has a first elastic rail segment (17a) and a second elastic rail segment (17b).

14. Wiper blade (10) according to any one of the preceding claims, characterized in that the damping element (40) is applied against the side of the elastic rail (17) turned towards the wiping lip (12).

15. Windscreen wiper blade (10) according to claims 9 and 11, characterized in that the base body (14) comprises at least two cavity walls (22, 24) surrounding the longitudinal cavity (18), the cover element (100) practically surrounds the walls (22, 24) of the cavity (18).

16. Wiper blade (10) according to any one of the preceding claims, characterized in that the wiping lip (12) has a maximum extension parallel to the wiping direction (30a, 32a) which extends over at least one tenth, in particular, at least one fifth of the maximum extension of the base body (14) parallel to the wiping direction (30a, 32a).

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