JPH02124348A - Wiper blade for wiper device for automobile - Google Patents

Abstract

PURPOSE: To ease wiper blade assembling work of a wiper blade having a flexible strip inserted in an elongate groove formed in the base center with its opening opened to the side by pressing the flexible strip against the inner wall of the gripping claws by means of a resilient element. CONSTITUTION: A wiper blade 12 installed on a wiper arm 11 includes a supporting yoke device 13 composed of a main yoke 14, an intermediate yoke 15 and claw yoke 16 and a rubber 18 is gripped by gripping claws 17 provided on respective yokes 15, 16. This rubber 18 includes a base center 20 of a nearly trapeziodal cross section with a elongate groove 21 on both sides and a foundation 23, a wiper lip 25 and the like successively connected to the lower part of the base center 20. A flexible strip 40 is inserted in the area of the elongate groove 21 but, in this case, the rubber 18 is formed with a plurality of knots 50 of a triangular cross section acting as a resilient element to the regions with respect to the elongate groove 21 and the flexible strip 40 is pressed against the gripping claw 17 by the existence of the knots 50.

Description

DETAILED DESCRIPTION OF THE INVENTION [INDUSTRIAL APPLICATION] The present invention comprises a rubber having a base central part and a wiper lip, the base central part being a lateral opening for inserting a flexible strip from the side. A motor vehicle having a support yoke device comprising at least one pawl yoke comprising at least one groove and further comprising at least one pawl yoke with a retaining pawl partially holding the central part of the foundation by covering the lateral gap of the elongated groove with its inner wall. The present invention relates to a wiper blade for a wiper device.

[Prior Art J] For modern automotive wiper blades, which usually have curved windshields, the rubber element produced from a resilient material is such that the rubber resilient material easily adapts itself to the curvature of the windshield. It is mounted on a support yoke device comprising several pawl yokes so as to be able to do so. The rubber has a basic central part in which the actual wiper lip is integrally formed via a tiltable web. Elongated grooves for one flexible strip are each formed on both sides of the base center, which elongated grooves are needed to stiffen the rubber and spread pressure. The retaining pawl of the pawl yoke retains the rubber base central part by largely engaging the curved retaining web of the retaining pawl into the additional guiding groove of the base central part. The inner walls of these retaining claws thus cover the lateral gaps of the elongated grooves for the flexible strips. Since the wiper lip or rubber of such a wiper blade moves with respect to the supporting yoke device when moving over a curved window pane, and thereby the flexible strip moving in the assigned elongated groove cannot be eliminated at all, these Care must be taken when dimensioning the components to ensure that there is sufficient play. On the other hand, for that reason it is unavoidable that the flexible strip and the inner wall of the pawl yoke come into contact with each other as a result. If, as usual, this flexible strip and the pawl yoke are made of metallic material, noise can occur at the point where the two parts come into contact with each other. The noise is considered by motorists to be a nuisance. Noise can be eliminated if one of the two parts is made of non-metallic material, especially plastic. However, for stability reasons, such a solution is not always implemented. Noise between the flexible strip and the pawl yoke is also eliminated by fitting the flexible strip into an elongated groove in the center of the base that is closed or at least partially closed on the sides. However, there are some difficulties in manufacturing rubber of such a profile and it is not easy to assemble the flexible strip into a very long closed groove.

[Problem to be Solved by the Invention] It is an object of the invention to provide a wiper blade of the type mentioned at the outset, in which excessive noise is eliminated by using easy means, thereby making it possible to assemble the wiper blade. The objective is to improve the process so that it remains easy and at least less difficult than the prior art.

This object is achieved by a wiper blade in which a flexible strip is pressed elastically against the inner wall of the retaining pawl by means of an elastic element.

Thereby, the invention provides that when these two parts are pressed elastically against each other by a sufficiently large force, the two parts
It is based on the idea that noise between individual parts can also be eliminated. For the wiper blade according to the invention, therefore, a resilient element is provided which forces the flexible strip laterally against the inner wall of the retaining pawl in an opposite outward direction.

Of course, the forces of these elements generated by it are
It must not be large enough to eliminate relative movement between the retaining pawl and the flexible strip. This is because the wiper blade can then no longer apply itself to a window pane that is curved to the extent required. With respect to the realization of the essential idea of the invention, the external shape and dimensions of these elastic elements are therefore of great importance.

In theory, the depth of the elongated groove for the flexible strip can be smaller than the width of the flexible strip such that in its entire length this flexible strip is pressed against the outside of the elongated groove and on the opposite side of the side wall of the retaining pawl. .

However, for such embodiments, the material quality of the rubber, in particular the elasticity of the rubber, must be taken into account so that the magnitude of the elastic pushing force used between the flexible strip and the retaining pawl is sufficiently accurate in a It is particularly difficult that it cannot be held constant.

To eliminate these problems, several nodes are placed at regular intervals from each other and a local reduction in the depth of the elongated groove is provided as a resilient element. Therefore, it is relatively easy to determine the pushing force between the flexible strip and the retaining pawl by the cross section of the nodes and the height of the nodes.

In theory, such nodes could of course also be placed as separate parts in each slot of the rubber.

However, it is preferred that the knots and the rubber are manufactured as one piece. This can be done without particular difficulty if the rubber is compression cast.

An easy movement of the flexible strip in the elongated groove is thereby ensured in that the nodes only make point or linear contact with the front surface of the flexible strip. This is achieved in a particularly simple way by using nodes with triangular cross section whose tips contact the front surface of the flexible strip.

In theory, the knot could be placed at a point where the retaining pawl of the rubber yoke also acts. However, by varying the distance between such nodes and the nails, the pushing force between the flexible strip and the retaining pawls can also be changed, so that each node is located a little apart and laterally from the nails. Preferably, the knots are spread out along elongated grooves.

For conventional wiper blades, elongated grooves are formed in the base center on both sides, whereby each elongated groove receives a flexible strip. For such embodiments, the nodes are made to protrude equally on both sides of the web separating the elongated grooves.

Thus, the flexible strip is pushed outward against the side walls of the retaining pawl by an equally distributed force.
The knots are formed perpendicular to the longitudinal direction of the wiper blade. It is thus avoided that the forces acting on the pawls of the support yoke device are not equal.

EXAMPLE A wiper designated by 10 for a wiper device of a motor vehicle comprises a wiper arm 11 on which a wiper blade 12 is rotatably mounted. FIG. 1 shows only the left half of this wiper blade 12. In the illustrated embodiment, the wiper blade 12 includes a main yoke 14, an intermediate yoke 15 rotatably mounted on the main yoke 14, and a clawed yoke rotatably mounted on the intermediate yoke 15. yoke) 16 is assigned to the supporting yoke device 13.

To hold the rubber 18, the pawl yoke 1B has two holding pawls 17, and the intermediate yoke has another holding pawl 17.

This rubber 18, as shown in FIG. 2, has a contour known in practice. It is long and narrow on both sides.
It consists of a basic central part 20 having a somewhat trapezoidal cross-section, in which is formed. Furthermore, the guide groove 22 is formed on both sides (Ill) of the central part 20 of the base.
4 is provided below from the base 23, and the wiper lip 25 is connected to the central part 20 of the base via such a web.

FIG. 2 shows a retaining pawl 17 comprising a web 30, two side walls 31 projecting laterally from this web, and a retaining web 32 bent from said side walls. web 3
0, the side walls 31, the retaining webs 32 delimit an area that partially corresponds to the cross-section of the central part of the foundation 20, whereby the retaining webs 32 are connected to the guide grooves 22 of the central part of the foundation.

Therefore, these retaining claws partially touch the base central part 20.
grasp. The inner wall 35 of the retaining pawl 17 thereby covers the lateral gap 26 of the elongated groove 21.

FIG. 3 shows a longitudinal section of the rubber 18 provided to support the flexible strip 40 in the area of this elongated groove 21. This elongated groove 21 is located at the end 2 of the wiper blade.
Closed at 7. protruding studs
28 is provided at a distance from the end 27 of this groove, the stud of which mates with each recess 41 of the assigned flexible strip 40. Thus, at one end of the rubber 18, the position of the flexible strip 40 is fixed with respect to the rubber 18.

A wiper blade having the above-mentioned characteristics is manufactured from multiple parts. Regarding the invention, a resilient element in the form of a knot 50 is absolutely necessary. The nodes act on the front surface 42 of the flexible strip 40 and force it laterally outwardly against the inner wall 35 of the retaining pawl 17.

The cross-sectional view of the nodes 50 in the plane of the flexible strip 40 is triangular so that their tips 51 contact the front surface 42 of the flexible strip 40. This tip 51 and this front side 42 of the flexible strip are thus in linear contact with each other. The necessary relative movement between the flexible strip and the rubber is then provided. Knob 50 and rubber 18 are manufactured as one piece and protrude from the inner part 60 of the elongated groove. Their lateral length corresponds to the width of the groove B, ie they fill the entire width of the groove up to the side wall 61 or 62 of the groove. In FIG. 1, the means by which these nodes 50 are positioned or spread out along the elongated groove 21 is indicated by arrows P. This shows that these nodes 50 are forced apart along the elongated groove 21 so that each of them is laterally located at a distance from the retaining pawl 17 of the pawl yoke.

Finally, FIG. 3 also reveals a conventional rubber having two elongated grooves formed in the central part of the base, whereby each elongated groove supports a flexible strip, and node 5
0 are located on either side of the web 65 separating these elongated grooves. Therefore, the nodes are equally pushed apart in both slots.

FIG. 2 shows a cross-sectional view of the rubber according to which the flexible strip 40 is inserted only into the right elongated groove. Comparing the length of the knob 50 in the right slot with the height of the knob in the left slot, it can be seen that this flexible strip 40 presses against the inner wall 35 of the retaining pawl 17 with a force. This pushing force is of such a magnitude that the rattling noise of the metal parts contacting each other at this point during normal operation is effectively eliminated.

On the other hand, however, the pressing force only needs to be so great that the necessary easy movement of the device in the longitudinal direction of the rubber is not hindered.

A wiper blade of this type can be manufactured and provided in a conventional manner, so that the assembly thereof according to the invention does not result in significant outlays. However, significant advantages regarding noise motion are achieved.

[Brief explanation of drawings]

FIG. 1 is a side view of one half of the wiper blade. FIG. 2 is a sectional view of the rubber in the area of the retaining pawl of the pawl yoke. FIG. 3 is a partial cross-sectional view of the rubber taken along line 2 in FIG. FIG. 4 is a partial cross-sectional view of the flexible strip. lO...wiper, 11... wiper arm, 12...
・Wiper blade, 13...Support yoke device, 16・
... Claw yoke, 17... Holding claw, 18... Rubber, 2
0...Central part of foundation, 21...Elongated groove, 22...
Guide groove, 25... Wiper lip, 2G... Gap, 3
5...Inner wall, 40...Flexible strip, 42...
- Front, 50... Node, 51... Tip, 6o... Back, 131, G2... Side wall, 65... Web.

Claims (8)

[Claims] (1) comprising a rubber having a central base portion and a wiper lip, the central base portion comprising at least one elongated groove that is a lateral opening for laterally inserting a flexible strip;
In a wiper blade having a support yoke arrangement comprising at least one pawl yoke, which further comprises at least one pawl yoke with a retaining pawl that partially retains the central part of the base by covering the lateral gap of the elongated groove with its inner wall, the flexible strip being resilient. A wiper blade for a wiper device, characterized in that it is elastically pressed against the inner wall of a holding pawl by a resilient element. (2) The plurality of nodes are located at a distance from each other, and the local reduction in the depth of the elongated groove acts as a resilient element.
Wiper blade as described. (3) The wiper blade according to claim 2, wherein the knot and the rubber are integrally manufactured. (4) The nodes protrude from the inner part of the elongated groove, and they extend corresponding to the width of the groove to the side walls of the groove, and they act on the front side of the flexible strip facing the inner part of the groove. Wiper blade as described. (5) A wiper blade according to any one of claims 2 to 4, wherein the cross-section of the nodes in the plane of the flexible strip is of such a type that the nodes touch the front surface of the flexible strip at points or lines. 6. The wiper blade of claim 5, wherein the nodes are at least substantially triangular in cross-section and their tips contact the front surface of the flexible strip. (7) A wiper blade according to any one of claims 2 to 6, wherein the nodes are each pushed apart along an elongated groove such that they are located laterally at a distance from the pawl of the pawl yoke of the support yoke device. . (8) Long and narrow grooves are formed on both sides of the central part of the rubber base,
A wiper blade according to any one of claims 2 to 7, wherein each elongated groove supports a flexible strip and the nodes are equally protruding on either side of the web separating the elongated grooves or at the depth of the groove.