VORRICHTUNG ZUR VERBESSERUNG DER WINTER-LAUFEIGENSCHAFTEN VON FAHRZEUGREIFEN

摘要

In an apparatus to improve the winter road-holding properties of vehicle tyres, having engagement elements (8) arranged in the grooves (7) of the tread profile, a long service life of the engagement elements (8) can be achieved by virtue of their being capable of being extended, when required, out of a position in which they are countersunk in the grooves (7) of the tread profile and over the surface of the tread profile, and vice versa. ……