Wiper blade with metal strip as tilting bar

Abstract

The invention relates to a wiper blade with a wiper head (1), wiper lip (2) and a connecting tilting bar. It is distinguished in that the wiper head (1) and the wiper lip (5) consist of at least one elastomer, and the connecting tilting bar is an elastic, resilient metal strip (4).

Description

[0001] The invention relates to a wiper blade, in which a metal strip is used as the tilting bar, as well as to the metal strip itself.PRIOR ART[0002] Wiper blades for motor vehicles or aircraft are subjected to great mechanical stresses, on the one hand because of dust, insect pieces and other hard dirt particles, which roughen the glass surface to be cleaned, and on the other hand by the tilting stress, which during the wiping process continuously changes directions, and is constant in the rest position because of the continuing contact pressure with the glass panel. Added to the mechanical stresses are chemical and environmental effects, for example because of ozone, oil and alcohol and / or detergents in the windshield washer fluid.[0003] Wiper blades with appropriate profiles (or cross sections) are as a rule continuously produced by means of extrusion or co-extrusion of vulcanizable polymer mixes. Following extrusion, the ropes are vulcanized to form elastomers and are cut to th...

AI Technical Summary

Benefits of technology

[0006] The highly stressed metal strip as the tilting bar, which determines the function and service life of the wiper blade, is completely impervious to chemical and environmental effects, such as occur when it is used in accordance with its purpose. The metal strip does no show aging under the effects of ozone, visible light or UV radiation, and no plastic deformation under pressure strain. Therefore wiper blades in accordance with the invention remain functional for a longer time than wiper blades with elastomeric tilting bars in accordance with the prior art. The elastic properties of the metallic tilting bars are furthermore practically independent of the outside temperature.

Problems solved by technology

But chlorination is damaging to a tilting bar made of caoutchouc and other rubber types of the diene type, because under continuous pressure stress it encourages permanent plastic deformation.

In blowing snow and at temperatures below the freezing point, EPDM rubber also becomes increasingly brittle and is then no longer a match for the changing tilting movements.

Furthermore, EPDM rubber is not impervious to the desired degree to chemicals and working materials, such as fuels or oil, which swell the rubber and soften it, which leads to a premature wear of the wiper blade lip and encourages plastic deformations.

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