Metallic reinforcing cord for tyres for vehicle wheels
AssigneePirelli Tyre S.p.A.
InventorsSimone Agresti, Guido Luigi Daghini, Stefano Bizzi
Life of this patent
Estimating the term…
Abstract
The invention relates to a metallic reinforcing cord (10) for tyres for vehicle wheels, comprising a plurality of metallic wires (11) twisted to one another with a single twisting pitch (P), or a single metallic wire twisted with at least one second metallic wire with a single twisting pitch, or a plurality of first metallic wires twisted to one another with a first twisting pitch to define a first strand of metallic wires and at least one second metallic wire twisted with said first strand of metallic wires with a second twisting pitch equal to or different from the first twisting pitch. The metallic reinforcing cord (10) has a part load elongation greater than or equal to 1%.
Claims14
A metallic reinforcing cord for tyres for vehicle wheels, comprising:
- i) a plurality of metallic wires twisted only to one another with a single twisting pitch;
- or
- ii) a single metallic wire twisted with at least one second metallic wire with a single twisting pitch;
- or
- iii) a plurality of first metallic wires twisted to one another with a first twisting pitch to define a first strand of metallic wires and at least one second metallic wire twisted only with the first strand of metallic wires with a second twisting pitch equal to or different from the first twisting pitch;
- wherein the metallic reinforcing cord has a part load elongation greater than or equal to 1%, the part load elongation being the difference between the percentage elongation obtained by subjecting the reinforcing cord to a traction of 50 N and the percentage elongation obtained by subjecting the reinforcing cord to a traction of 2.5 N and being evaluated with the method BISFA E7.
Dependencies are inferred from the claim text.