Back to results
US 4,258,543 AGranted
Metal cord
AssigneeIndustrie Pirelli S.p.A.
InventorsCesare Canevari, Luciano Tarantola
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeIndustrie Pirelli S.p.A.
InventorsCesare Canevari, Luciano Tarantola
Estimating the term…
Metal cord, for reinforcing articles of an elastomeric material, such as tires, conveyor belts and so on of the single strand type, in particular made up of a plurality of 3, 4 or 5 wires, wherein the said wires are twisted together loosely, so as to result as being spaced apart from each other but in such a way that the ratio between the diameter of the circumference circumscribing the swollen cord and the diameter of the circumference circumscribing the corresponding compact cord, is comprised between 1.06 and 1.20. A thus realized cord consents for an optimum penetration of the elastomeric filler material but at the same time a tensile behavior, and in particular an elongation in the field of low values of loads applied, which does not differ in any appreciable way from that of the corresponding compact cord.
Cord of the single strand type adapted for the reinforcement of articles of elastomeric material, consisting of 3 to 5 steel wires, individually twisted and helicoidally wound together into a swollen geometric configuration, having a diameter greater than the diameter of the same cord in the compact geometric configuration, characterized by the fact that the ratio between the said diameters is between 1.06 and 1.20.
An elastomeric article reinforced with a cable comprising a plurality of helically wound steel wires with spaces between the wires to provide a cross-section of the cable which is between 1.06 and 1.2 times the cross-section of similarly helically wound wires in which their surfaces are contacting each other.
A coreless multistrand cord of steel wires adapted to reinforce an elastomeric aricle, said steel wires being twisted together and loosely helically wound to form a strand having a cross-section which is 1.06 to 1.2 times the cross-section of a similar strand in which the wires are twisted compactly together.
Dependencies are inferred from the claim text.