Patent ID: 9475346
Filing Date: 2016-10-25
CPC Classification: B60C

Claim Text:
1. A tread band comprising at least one first longitudinal groove bounded by a bottom wall, and by two sidewalls located on opposite sides of the bottom wall and forming two corresponding outer edges with a rolling surface; each sidewall of the first longitudinal groove has a continuous sequence of alternating projections and recesses, which extend crosswise so that, in plan view, the first longitudinal groove is zigzag shaped; and each projection of one sidewall of the first longitudinal groove faces a corresponding one of the recesses in the other sidewall of the first longitudinal groove; each sidewall of the first longitudinal groove comprises an outer portion extending between a corresponding one of the outer edges and a corresponding intermediate line and sloping at an obtuse angle to the bottom wall; and an inner portion extending between the corresponding intermediate line and the bottom wall and forming a right-angle with the bottom wall; and at all the projections, the outer portion of each sidewall slopes at a first obtuse angle to the bottom wall, and, at all the recesses, the outer portion of each sidewall slopes at a second obtuse angle, different from the first obtuse angle, to the bottom wall; wherein each outer edge is defined by a series of alternating straight segments corresponding to the continuous sequence of alternating projections and recesses, and on each side of the first longitudinal groove, the straight segments corresponding to the projections are aligned along a same first circumferential line and the straight segments corresponding to the recesses are aligned along a same second circumferential line.