Wiper blade device and wiper blade incorporating such a device
The wiper blade device with a damping unit and concave damping fins addresses excessive tilting and noise issues by converting structural forces into contact pressure for improved sealing and wiping performance.
Patent Information
- Application Number
- FR2022009124
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2021-09-15
- Filing Date
- 2022-09-12
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2042-09-12
AI Technical Summary
Existing windshield wiper blade designs suffer from excessive tilting, noise, and inadequate sealing due to inefficient force transmission and support mechanisms.
A wiper blade device with a damping unit featuring damping fins that extend perpendicularly between the head blade element and the wiping lip, providing a concave outer surface in the unstressed state, which supports the wiping lip and converts structural forces into contact pressure for improved sealing and reduces tilting.
The solution effectively prevents excessive tilting, reduces noise, and enhances the sealing performance by ensuring a good contact pressure on the vehicle window, resulting in a more effective wiping action.
Smart Images
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Abstract
Description
Title of the invention: Wiper blade device and wiper blade comprising such a device. FIELD OF THE INVENTION
[0001] The present invention relates to a wiping blade device and a windshield wiper equipped with such a device. STATE OF THE ART
[0002] A wiper blade device for a windshield wiper is already known, comprising a head blade element with a receiving area for an elastic rail, a wiping lip to rest against the vehicle window and an elastic pivot spacer connecting the head blade element to the wiping lip by an elastic connection with a damping fin extending almost perpendicularly from the pivot spacer, and passing between the head blade element and the wiping lip.
[0003] DESCRIPTION AND ADVANTAGES OF THE INVENTION
[0004] The present invention relates to a wiper blade device comprising a head blade element which delimits a receiving area of an elastic rail, a wiping lip for applying against a vehicle window, an elastic pivot spacer, which elastically connects the head blade element to the wiping lip and a damping unit comprising at least one damping fin originating from the pivot spacer and passing at least practically perpendicularly between the head blade element and the wiping lip, this device being characterized in that the damping fin, in the unstressed state, has in section perpendicular to the longitudinal axis, a concave outer surface turned towards the head blade element.
[0005] The term "wiper blade device" in this context refers to a wiper blade element or unit made of an elastic material; this element is designed to be moved by the wiping edge of a wiping lip to clean a surface, in particular a glazed surface, preferably a motor vehicle window, by functional contact as it passes over the surface to be cleaned. The term "wiping lip" in this context refers to a partial area of the wiper blade device that comes into direct contact with the surface to be cleaned. The wiping lip is preferably applied in a tight seal against the surface to be cleaned.
[0006] In the present context, the expression "head blade element" refers to an element of a wiper blade device used to fix the wiper blade device to a wiper blade carrier component.
[0007] It should be noted that the conjunction "or" used in this description combines the "inclusive OR" and "exclusive OR" junctions.
[0008] A person skilled in the art is aware of various components of interest for a windshield wiper blade, such as, for example, a deflector unit, a bracket unit, or an elastic rail. A guide element preferably constitutes a component of the wiper blade's support structure. The guide element is preferably an elastic rail. The term "elastic rail" refers to a macroscopic element that, under normal operating conditions, varies elastically by at least 10%, in particular by at least 20%, preferably by at least 30%, and, particularly advantageously, by at least 50%, through elastic variation, in particular with an extension dependent on the variation, and preferably generating a reaction proportional to and opposing the variation. Preferably, the elastic rail is at least partially made of spring steel.
[0009] The elastic rail, in its unstressed state, is practically shaped like a curved rod, and more advantageously, like a flattened, curved rod. Particularly advantageously, depending on its longitudinal extension in the unstressed state, the curvature of the elastic rail is greater than the curvature of the vehicle's outer surface, particularly the window over which the elastic rail passes in at least one operating state. The term "extension of an object" refers in particular to the maximum distance between two points in the perpendicular projection of the element onto a plane. The term "macroscopic element" refers in particular to an element having an extension of at least 1 mm, more specifically at least 5 mm, and preferably at least 10 mm.
[0010] In this context, the term "pivot spacer" refers to a connecting element that extends parallel to the principal direction of extension of the wiping blade device. The pivot spacer preferably extends along the entire length of the wiping blade device. Preferably, it is a connecting element that elastically links the head blade element to the wiping lip. The pivot spacer allows the wiping lip to pivot relative to the head blade element. The term "designed for" is synonymous with "specifically designed or manufactured for...". The fact that an object is designed to perform a certain function means that this object performs or applies this function in at least one application or operating state.The expression "principal direction of extension" of an object refers in particular to a direction parallel to the longest edge of the smallest geometric parallelepiped that closely and completely surrounds the object.
[0011] The expression "damping fin" in this context refers to an element which, in at least one operating state, particularly during the switching of the The wiper blade assembly supports the wiper lip. Preferably, the tilting fin is designed so that, upon tilting of the wiper blade assembly, it deflects the force transmitted by the elastic rail to the wiper lip or opposes the tilting movement. The damping fin is designed to oppose tilting when a limiting angle is reached. The term "limiting angle" in this context refers, in particular, to the tilting angle between the wiper lip and the head blade element; this limiting angle is the smallest possible tilting angle at which the free end of at least one damping fin is in contact with the head blade element of the wiper blade assembly.
[0012] Preferably, the damping fin has a principal extension direction parallel to the principal extension direction of the wiping blade device. Preferably, the damping fin extends from the pivot spacer at least practically perpendicularly and passes between the head blade element and the wiping lip.
[0013] Preferably, the damping fin extends along the entire length of the wiping blade assembly. In a cross-section perpendicular to the longitudinal axis of the wiping blade assembly, the damping fin, in its unstressed state, has an outer surface whose concavity faces the head blade element. Preferably, the damping fin of the wiping blade unit in its unstressed state has at least one free end separated from the wiping lip and the head blade element. This damping fin of the wiping blade assembly in its unstressed state has an elongated, curved extension. Preferably, the connecting end of the damping fin is formed in one piece with the pivot rib.Preferably, the connecting end and the free end of the damping fin in the unstressed state are located in a plane parallel to the longitudinal axis, the median area of the damping fin extending on the side of the wiping lip of this plane.
[0014] Preferably, the plane is practically parallel to the plane of symmetry of the wiping blade device and passes through the wiping lip and the head blade element, intersecting the geometric center of the wiping blade device. This plane forms, in particular, the principal extension plane of the damping fin. The term "longitudinal axis" of an object preferably designates the axis parallel to the longest edge of the smallest geometric parallelepiped that completely encloses the object. The term "substantially perpendicular" preferably designates the orientation of a direction with respect to a reference direction; this direction and the reference direction, considered in particular in a projection plane, form an angle of 90° with each other, with a maximum deviation in particular less than 8° and advantageously less at 5° and particularly advantageously below 2°.
[0015] The expression "in one piece" is synonymous with joining by material, for example, by a welding, bonding, injection molding, or other advantageous process or technique, or being made in one piece, for example, by manufacturing from a cast iron or by manufacturing by a one- or multi-component process and advantageously obtained from a blank. The expression "principal plane of extension" of a component refers in particular to a plane parallel to the largest lateral surface of the smallest geometric parallelepiped that closely surrounds the component and that passes in particular through the center of the parallelepiped.
[0016] The implementation of the wiper blade assembly according to the invention and of the wiper arm makes it possible to obtain a particularly advantageous wiping result. In particular, the transmission of forces is advantageously achieved. Specifically, excessive tilting of the wiper blade is avoided. This results in a significant reduction in the noise emitted by the tilting of the wiper blade assembly. In particular, the damping unit ensures the support function in the vertical direction, and the force from the structure is thus transformed into a contact pressure on the single tip of the wiping lip, achieving a particularly good seal with the vehicle's windshield.
[0017] According to another feature, the damping unit specifically comprises two damping fins on opposite sides of the pivot rib starting from it and passing between the head blade element and the wiping lip.
[0018] Preferably, the two damping fins are provided on opposite sides of a symmetrical plane of the wiping blade device and which pass through the wiping lip and the head blade element as well as through the geometric center of the wiping blade device.
[0019] Preferably, two damping fins are provided which, in the unstressed state, are separated from the head element and the wiping lip. The two damping fins have a maximum transverse extension greater than the maximum transverse extension of the wiping lip, which ensures an advantageous wiping result and, in particular, an advantageous transmission of forces.
[0020] In particular, excessive tilting of the wiper lip is avoided. Noise during the tilting of the wiper blade device is advantageously reduced. The damping unit is specifically designed to provide support in the vertical direction and to convert a force from the structure into contact pressure at the single tip of the wiper lip. This ensures, in particular, a good seal with the vehicle window.
[0021] According to another feature, the head blade element, in the unstressed state of the wiping blade device, is separated by at least one damping fin. Preferably, the head blade element has practically identical transverse extension on both sides of the plane of symmetry of the wiping blade assembly. The term "transverse extension" of an object refers to the extension of the object along an axis transverse to the object. The term "transverse axis" of an object refers to an axis perpendicular to the object's longitudinal axis, perpendicular to the longest edge of the smallest geometric parallelepiped that closely and completely surrounds the object. This results in advantageous wiping performance. In particular, it leads to an advantageous distribution of forces, preventing excessive tilting of the wiping blade. Furthermore, it advantageously reduces the noise of the wiping blade assembly's tilting.
[0022] According to another feature, a free end of a damping fin, at least in the maximum stress state of the wiper blade device, is in direct contact with the head blade element. The expression "maximum stress state" in this context refers to an operating state of the wiper blade device in which this wiper blade device, in its maximum normal operating mode, receives a stress on one side of the damping fin; in particular, in the maximum stress state, there is no contact between the end of a damping fin and the head blade element; in particular, contact between the free end of the damping fin and the head blade element is made possible by the tilting of the wiper blade device.
[0023] Preferably, the tilting of the wiping blade device by tilting the wiping lip is thus made possible, and in particular the tilting of the pivot spacer. Preferably, the tilting of the pivot spacer causes at least one damping fin to move towards the head blade element. Preferably, this damping fin is moved towards the head blade element until the free end of this damping fin comes into contact with the head blade element.
[0024] Preferably, the free end of at least one damping fin supports this damping fin at the maximum stress state of the wiper blade assembly against the head blade element, resulting in an advantageous wiping effect. In particular, this provides advantageous force transmission and prevents excessive tilting of the wiper blade. Furthermore, it reduces noise during the tilting of the wiper blade assembly. Specifically, the damping unit ensures a support function in the vertical direction and converts the force from the structure into a contact pressure applied to the single tip of the wiper lip. This ensures a good seal against the vehicle window.
[0025] According to another feature, the damping fin has, in perpendicular section dicular to the longitudinal axis, a convex bearing surface facing the wiping lip. Preferably, the bearing surface of this damping fin supports the wiping lip at least in the stressed state of the wiping blade device, in particular at least for the tilting of the wiping lip.
[0026] Preferably, the bearing surface is provided in the median zone of the damping fin. Preferably, the median zone extends over the entire length of at least one damping fin. Preferably, the median zone considered perpendicular to the principal plane of extension of the median zone has a rectangular projection surface.
[0027] Preferably, the transverse extent of the zone is offset by the same distance from the free end of at least one damping fin and from the connecting end of that damping fin. Preferably, these distances correspond respectively to at least 40%, at least preferably to 45%, and particularly preferably to at least 47.5% of the transverse extent of at least one damping fin. This results in an advantageous wiping performance. In particular, it provides advantageous force transmission. Specifically, it prevents excessive blade tilting and, in particular, advantageously reduces the tilting noise of the wiping blade assembly.In particular, the damping fin ensures a support function in the vertical direction and converts a force from the structure into a contact pressure from a single tip of the wiping lip, which allows for a particularly good seal with the vehicle window.
[0028] According to another feature, at least at the maximum load state of the wiper blade device, the bearing surface of at least one damping fin is in contact with the wiper lip. Preferably, the bearing surface of the damping fin, at least at one maximum load state of the wiper blade device, particularly for the tilting of the wiper lip, is in contact with an edge of the wiper lip. Preferably, the edge of the wiper lip in contact with the bearing surface is on the side of the wiper lip opposite the head blade element.
[0029] Preferably, the edge of the wiping lip in contact with the bearing surface is located in the end zone of the transverse extension of the wiping lip. The expression "end zone of the transverse extension" refers, in this context, to an area of the wiping lip which, in the direction of the transverse extension, is furthest from the plane of symmetry of the wiping blade device and whose transverse extension corresponds to a maximum of 10%, preferably a maximum of 5%, of the transverse extension of the wiping lip. Preferably, this results in an advantageous reduction of the noise of the bearing. The wiping lip presses against the contact surface. Preferably, the forces from the wiping lip to the wiper blade element are transmitted via a damping fin. This results in an advantageous wiping performance. It also provides, in particular, an advantageous distribution of forces and, specifically, an advantageous transmission of forces, preventing excessive tilting of the wiper blade. In particular, this advantageously reduces the noise of the wiper mechanism tilting, especially on the damping unit, by ensuring a support function in the vertical direction and converting the force from the structure into contact pressure via a single point on the wiping lip. This ensures, in particular, a good seal of contact with the vehicle's glass.
[0030] According to another feature, the head blade element has a receiving area in the form of a longitudinal channel that completely receives the head blade element. The receiving area in its unloaded state has a considerably longer horizontal transverse extension than its vertical transverse extension. Preferably, the receiving area extends along the entire length of the wiping blade assembly. This results in a particularly advantageous wiping performance. In particular, the transmission of forces is advantageous and, notably, prevents excessive tilting of the wiping blade. The noise from the tilting of the wiping blade assembly is also advantageously reduced.In particular, the damping unit ensures a support function in the vertical direction and a force from the structure is converted into a contact pressure at the single tip of the wiping lip, which ensures a good seal with the vehicle window.
[0031] According to another feature, the pivot rib comprises a first pivot rib part between the damping unit and the head blade element and a second pivot rib part between the damping unit and the wiping lip; the thickness of the first pivot rib part being at most three times as great as the thickness of the second pivot rib.
[0032] Preferably, the two rib-pivot parts in the maximum loaded state have a greater deflection than in the unloaded state. Preferably, the deflection of the second part of the rib-pivot is much greater than the deflection of the first part of the rib-pivot. This results in a particularly advantageous wiping effect, notably an advantageous transmission of forces. Excessive tilting of the wiping blade is prevented. In particular, noise during the tilting of the wiping blade device is reduced. Specifically, the damping unit ensures a support function in the vertical direction and converts the force from the structure into a contact pressure at the single tip of the wiping lip. This notably ensures a good seal with the vehicle window.
[0033] The invention also relates to a windshield wiper equipped with such a wiping blade device.
[0034] The wiper blade device according to the invention, as well as the wiper blade, are not limited to the means described above, but allow for numerous variations falling within the scope of the interpretation of the claims. Brief description of the drawings
[0035] The present invention will be described in more detail below with the aid of examples of wiper blade devices and wiper blades thus made, schematically represented in the accompanying drawings in which:
[0036] [Fig-1] a schematic of part of a windshield wiper blade according to the invention with a wiping blade device according to the invention, in its unstressed state,
[0037] [Fig.2] Schematic view of a wiping blade device according to the invention in the state of maximum stress,
[0038] [Fig.3] schematic representation of a variant of a windshield wiper blade according to the invention and of a variant of a windshield wiper device according to the invention in the unloaded state, and
[0039] [Fig.4] Diagram of a variant of a wiping blade device according to the invention in the maximum stress state.
[0040] DESCRIPTION OF EMBODIMENT METHODS OF THE INVENTION
[0041] Figure 1 shows a portion of a wiper blade 12a equipped with a wiping blade device 10a according to the invention. The wiper blade 12a includes a flexible rail 20a. Figure 1 shows the wiping blade device 10a in its unloaded state. The wiping blade device 10a is intended to equip a wiper blade 12a. The wiping blade device 10a includes a head blade element 14a. The head blade element 14a defines a receiving area 16a. The receiving area 16a is used to receive the flexible rail 20a. The wiping blade device 10a includes a wiping lip 22a. The wiper lip 22a is designed to bear against a window 24a of the vehicle. The wiper blade assembly 10a includes a flexible pivot rib 26a. The pivot rib 26a connects the head blade element 14a and the wiper lip 22a via a flexible linkage. The wiper blade assembly 10a includes a damping unit 28a.The damping unit 28a comprises at least one damping fin 30a, 30'a. The damping fin 30a, 30'a originates from the pivot rib 26 almost perpendicularly to pass between the head blade element 14a and the wiping lip 22a. The damping fin 30a, 30'a in the unstressed state has a cross-section perpendicular to the longitudinal axis, with a concave outer surface facing the head blade element 14a.
[0042] The wiper blade assembly 10a is elongated in shape and has a virtually identical cross-section along its entire length. The wiper blade assembly 10a is manufactured by an extrusion process. In principle, other technically advantageous manufacturing processes could also be used. The wiper blade assembly 10a is primarily made of rubber. However, other technically advantageous materials could also be considered. The wiper blade assembly 10a includes the wiping lip 22a. The wiping lip 22a is applied directly against the vehicle's window 24a.
[0043] The wiper lip 22a has a cross-section that decreases towards the vehicle window, and the lower free edge of the wiper lip 22a is shaped like a wiping edge. The wiper blade assembly 10a also includes a head blade element 14a. The head blade element 14a has a nearly parallelepiped shape. The wiper lip 22a is rigidly connected to the head blade element 14a. The wiper lip 22a is connected to the head blade element 14a via the narrow pivot rib 26a.
[0044] The wiping lip 22a is connected to the head blade element 14a by the narrow pivot rib 26a on its side opposite the wiping edge. The wiping lip 22a can pivot relative to the head blade element 14a by means of its pivot rib 22a. The wiping lip 22a, the head blade element 14a, and the pivot rib 26a extend along the principal extension direction of the wiping blade device 10a, over the entire extension of this wiping blade device 10a. The wiping blade device 10a has a constant cross-section ([Fig. 1]).
[0045] The damping unit 28a includes a damping fin 30a, 30'a. The damping fins 30a, 30'a extend on opposite sides of the pivot rib 26a from this pivot rib 26a between the head blade element 14a and the wiping lip 22a ([Fig.1]).
[0046] The head blade element 14a in the unstressed state of the wiper blade device 10a is separated from at least one damping fin 30a, 30'a, in particular from the two damping fins 30a, 30'a ([Fig.l]).
[0047] The damping fins 30a, 30'a are each made in the form of a fin. The damping fins 30a, 30'a extend respectively along the principal direction of extension of the wiping blade device 10a over the entire extension of the wiping device 10a. The damping fins 30a, 30'a each have a constant cross-section along the principal direction of extension of the wiping blade device 10a. The damping fins 30'a originate respectively from the pivot rib 26a. The damping fins 30a, 30'a are each connected on one side to the pivot rib 26a. The damping fins 30a, 30'a are in one piece with the wiping blade device 10a ([Fig.l]).
[0048] At least one damping fin 30a, 30'a and in particular the two damping fins 30a, 30'a each have a free end 32a, 32'a. The free end 32a, 32'a, in particular the two free ends 32a, 32'a of a damping fin 30a, 30'a and in particular of the two damping fins 30a, 30'a are in the state of maximum stress of the wiping blade device 10a, in contact with the head blade element 14a ([Fig.2]). The contact between the free ends 32a, 32'a and the head blade element 14a is made on the side of the head blade element 14a turned towards the wiping blade 22a ([Fig. 1]).
[0049] Preferably, the two damping fins 30a, 30'a originate from opposite sides of a plane of symmetry of the wiping blade device 10a passing through the wiping lips 22a and the head blade element 14a and through the geometric center of the wiping blade device 10a.
[0050] Preferably, the two damping fins 30a, 30'a in the unstressed state are separated from the head blade element 14a and the wiping lip 22a. Preferably, the two damping fins 30a, 30'a have a maximum extension longer than the maximum transverse extension of the wiping lip 22a. At least one damping fin 30a, 30'a and in particular both damping fins 30a, 30'a have, in section perpendicular to the longitudinal axis, a respective convex bearing surface 34a, 34'a, facing the wiping lip 22a ( [Fig.2]).
[0051] At least one bearing surface 34a, 34'a and in particular the two bearing surfaces 34a, 34'a of a damping fin 30a, 30'a and in particular of the two damping fins 30a, 30'a are in contact with the wiping lip 22a in the state of maximum stress of the wiping device 10a ([Fig.2]).
[0052] Figure 2 shows the wiper blade assembly 10a under maximum stress. The wiper blade assembly 10a transmits force between the elastic rail 20a and the wiper lip 22a. The blade assembly 10a transmits the forces from the elastic rail 20a via the wiper lip 22a to the vehicle window 24a. The wiper blade assembly 10a transmits the forces from the wiper lip 22a to the head blade element 14a. The transmission of forces from the wiper lip 22a to the head blade element 14a is made possible by the damping unit 28a, in particular, by at least one damping fin 30a.
[0053] The head blade element 14a defines the receiving area 16a, and this area has a longitudinal channel formed entirely within the head blade element 14a. The receiving area 16a has a practically rectangular cross-section. The vertical transverse extent of the receiving area 16a is much smaller than its horizontal transverse extent ([Fig. 2]). The horizontal transverse extent of the receiving area 16a corresponds to more than 50% of the total extension. The horizontal cross-section of the head blade element 14a. The receiving area 16a has two openings. The two openings of the receiving area 16a are at the respective ends of the wiping blade device 10a. The two openings of the receiving area 16a, in their unloaded state, are parallel. The two openings of the receiving area 16a are located in planes that, in their unloaded state, are perpendicular to the longitudinal axis of the wiping blade device 10a.
[0054] Figure 1 shows the pivot rib 26a in its unstressed state. The pivot rib 26a comprises a first pivot rib portion 36a. This first pivot rib portion 36a is located between the damping unit 28a and the head blade element 14a. The pivot rib 26a comprises a second pivot rib portion 38a. This second pivot rib portion 38a is located between the damping unit 28a and the wiping lip 22a. The thickness of the first transverse rib portion 36a is less than three times the thickness of the second transverse rib portion 38a. Figure 1 shows the wiping blade device 10a in its unstressed state. In this unstressed state, the damping fins 30a, 30'a are separated from the head blade element 14a and the wiping lip 22a. The thickness of the first part of the transverse rib 36a is less than three times the thickness of the second part of the transverse rib 38a. The [Fig.l] shows the wiping blade device 10a in the unstressed state. In this unstressed state, the damping fins 30a, 30'a are separated from the head blade element 14a and the wiping lip 22a.
[0055] Figure 2 shows the wiping blade device 10a in a state of maximum stress; a first damping fin 30'a is in contact with the head blade element 14a and the wiping lip 22a. In the state of maximum stress, the free end of the first damping fin 30'a is in contact with the head blade element 14a and the bearing surface of this first damping fin 30'a is in contact with the wiping lip 22a. In the state of maximum stress, the second damping fin 30a' is separated from the head blade element 14a and the wiping lip 22a. At the state of maximum stress, the wiping lip 22a is tilted and the pivot rib 26a is tilted and the tilt angle of the first part of the pivot rib 36a is less than the tilt angle of the second part of the pivot rib 38a.
[0056] Figures 3 and 4 show an alternative embodiment of the invention. The following description and drawings are limited to the main differences between the embodiments; the same elements bear the same numerical references; reference is made to the figures and the description of the preceding embodiment shown in Figures 1 and 2. To distinguish the embodiments, the suffix (a) in the embodiment shown in Figures 1 and 2 is replaced by the suffix (b) in the embodiment shown in Figures 3 and 4.
[0057] Figures 3 and 4 show a portion of a wiper blade 12b equipped with a wiping blade device 10b according to the invention. The wiper blade 12b has two elastic rails 20b. The elastic rails 20b are housed in the receiving area 16b. Figure 3 shows the wiping blade device 10b in its unloaded state. The wiping blade device 10b is fitted to a wiper blade 12b. The wiping blade device 10b includes a head blade element 14b. The head blade element 14b defines the receiving area 16b. The receiving area 16b serves to receive the elastic rails 20b. The wiper blade assembly 10b includes a wiper lip 22b. The wiper lip 22b rests against a window 24b of the vehicle. The wiper blade assembly 10b includes an elastic pivot rib 26b. The pivot rib 26b elastically connects the head blade element 14b and the wiper lip 22b.The wiping blade assembly 10b includes a damping unit 28b. The pivot rib 26b has a first pivot rib portion 36b. The first pivot rib portion 36b is located between the damping unit 28b and the head blade element 14b. The pivot rib 26b includes a second pivot rib portion 38b. This second pivot rib portion 38b is located between the damping unit 28b and the wiping lip 22b.
[0058] The damping unit 28b comprises two damping fins 30b, 30'b. The damping fins 30b, 30'b extend over opposite sides of the pivot rib 26b, starting from this pivot rib 26b and passing between the head blade element 14b and the wiping lip 22b. The damping fins 30b, 30'b each have a free end 32b, 32'b. The damping fins 30b, 30'b each have a bearing surface 34b, 34'b ([Fig.3]).
[0059] The head blade element 14b forms a receiving area 16b for receiving at least the elastic rails 20b of the wiper blade 12b. The head blade element 14b forms two receiving areas 16b for receiving one elastic rail 20b of the wiper blade 12b, respectively. The receiving areas 16b extend along the main extension direction of the wiper blade device 10a, over the entire extension of the head blade element 14b. The receiving areas 16b have a rectangular cross-section bounded on three sides by the material of the head blade element 14b. Each receiving area 16b has an opening leading to one side, parallel to the main extension direction of the wiper blade device 10b.
[0060] The receiving areas 16b are provided on opposite sides of the head blade element 14b. The receiving areas are provided on opposite sides of the head blade element 14b, respectively with respect to the plane of symmetry of the wiper blade device 10b, which is parallel to the principal extension direction of the wiper blade device 10b, in particular perpendicular to the vehicle window 24b with respect to on the opposite side of the head blade element 14b. The openings of the receiving zones 16b are respectively oriented in opposite directions. These openings allow the elastic rails 20b to engage in the receiving zones 16b. In the assembled state, the elastic rails 20b partially protrude from the openings of the receiving zones 16b ([Fig.3]).
[0061] NOMENCLATURE OF MAIN ELEMENTS
[0062] (references limited to numeric references without the suffixes a and b or primes)
[0063] 10 Wiping blade device
[0064] 12 Windshield wiper blade
[0065] 14 Head blade element
[0066] 16 Reception area
[0067] 20 Elastic rail
[0068] 22 Wiping lip
[0069] 24 Vehicle window
[0070] 26 Pivot spacer
[0071] 28 Damping Unit
[0072] 30 Damping fin
[0073] 32 Free end of the damping fin
[0074] 34 Bearing surface
[0075] 36 First part of pivot rib
[0076] 38 Second part of pivot rib
Claims
Demands
1. Wiper blade device (10a; 10b) of a wiper blade (12a; 12b) of a wiper comprising a head blade element (14a; 14b) which delimits at least one receiving area (16a; 16b) for receiving an elastic rail (20a; 20b), a wiping lip (22a; 22b) for applying against a vehicle window (24a; 24b), an elastic pivot spacer (26a; 26b), which elastically connects the head blade element (14a; 14b) to the wiping lip (22a; 22b) and a damping unit (28a; 28b) comprising at least one damping fin (30a, 30'a; 30b, 30'b) which extends from the pivot spacer (26a; 26b) at least practically perpendicularly between the head blade element (14a; 14b) and the wiping lip (22a; 22b), device characterized in that the damping fin (30a, 30'a;30b, 30'b) in the unstressed state presents in section perpendicular to the longitudinal axis, a concave outer surface facing towards the head blade element (14a; 14b).;
2. Wiping blade device according to claim 1, characterized in that the damping unit (28a; 28b) has exactly two damping fins (30a; 30'a; 30b 30'b) which originate from opposite sides of the pivot spacer (26a; 26b) from this pivot spacer (26a; 26b) between the head blade element (14a; 14b) and the wiping lip (22a; 22b).
3. Wiper blade device according to any one of the preceding claims, characterized in that the head blade element (14a; 14b) in the unstressed state of the wiper blade device, is separated by at least one damping fin (30a, 30'a; 30b, 30'b).
4. Wiper blade device according to any one of the preceding claims, characterized in that a free end (32a, 32'a; 32b, 32'b) of a damping fin (30a, 30'a; 30b, 30'b) is in contact with the head blade element (14a; 14b) at least in the maximum stress state of the wiper blade device (10a; 10b).
5. Wiping blade device according to any one of the preceding claims, characterized in that at least one damping fin (30a, 30'a; 30b, 30'b) has a bearing surface (34a, 34'a; 34b, 34'b) turned towards the wiping lip (22a; 22b) and which is convex in section perpendicular to the longitudinal axis.
6. Wiping blade device according to claim 5, characterized in that the bearing surface (34a, 34'a; 34b, 34'b) of at least one damping fin (30a, 30'a; 30b, 30'b) is in contact with the wiping lip (22a; 22b) for the maximum stress state of the wiping blade device (10a; 10b).
7. Wiping blade device according to any one of the preceding claims, characterized in that the head blade element (14a) delimits a receiving area (16a), this receiving area (16a) being in the form of a longitudinal channel completely receiving the head blade element (14a).
8. Wiping blade device according to any one of the preceding claims, characterized in that the pivot spacer (26a; 26b) has at least a first pivot spacer part (36a, 36b) between the damping unit (28a, 28b) and the head blade element (14a, 14b) and a second pivot spacer part (38a, 38b) between the damping unit (28a, 28b) and the wiping lip (22a, 22b), the thickness of the first pivot spacer part (36a; 36b) is at most three times greater than the thickness of the second pivot spacer part (38a, 38b).
9. Wiper blade (12a, 12b) comprising a wiping blade device (10a, 10b) according to any one of claims 1 to 8.