Tread fo heavy-vehicle tire having connecting bridges

Details Tread fo heavy-vehicle tire having connecting bridges Tread fo heavy-vehicle tire having connecting bridges

2011-01-25

2011-01-25

Maki, Steven D (Department: 1791)

Resilient tires and wheels

Tires, resilient

Anti-skid devices

C152S209250, C152S209270, C152SDIG020, C152S902000

Reexamination Certificate

active

07874333

ABSTRACT:
A tread (1) comprising a plurality of grooves of longitudinal and transverse general orientation (2b, 2c, 31, 32), the grooves of longitudinal orientation comprising main grooves (2b, 2c) of depth G and secondary grooves (31, 32) of depth G′ less than the depth G of the main grooves, the central part (C) of the tread, defined axially by two grooves of longitudinal orientation, and of a width of between 0.25 and 0.5 times the width W of the tread, being provided with at least one main groove (2c) of longitudinal orientation and of average depth G. The depth G′ of the secondary grooves (31, 32) is between 0.4 and 0.6 times the depth G of the main grooves (2b, 2c). The transverse grooves (5c) of the ribs of the central part (C) comprise over at most half of their length a connecting bridge (6c), the surface radially to the outside of which is at a distance Hc from the running surface of between 0.4 and 0.8 times the depth G of the main grooves. The transverse grooves (5b) of the ribs of each edge (B) comprise over at most half of their length a connecting bridge (6b) which prevents closure of said transverse grooves. The surface radially to the outside is at a distance Hs from the running surface which is at most equal to 0.3 times the depth G of the main grooves.

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