The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2001
Filed:
Dec. 14, 1999
Marco Cipparrone, Fiesole, IT;
Omero Noferi, San Giovanni Valdarno, IT;
Pirelli Coordinamento Pneumatici SpA, Milan, IT;
Abstract
A cord comprising at least a first pair and a second pair of wires (,) of different diameter randomly disposed in transverse cross section thereof, is obtained by arranging in a nacelle (,) of a double-twisting laying machine, a twister (,) operating upstream of a preformer (,). The twister (,), rotating in a direction opposite to that of the impeller (,) and at a speed which is twice that of the impeller, neutralizes the internal torsional stresses induced in the wires (,) by effect of the double twisting carried out upon the action of the impeller itself. Thus, a better control of the preforming operation executed on the wires (,) disposed parallel in respectively coplanar axes is enabled. The obtained cord (,), within each laying pitch and only under a traction condition involving a load not exceeding 5 kg, has at least one right cross section in which at least one wire (,) is spaced apart from at least one of the adjacent wires so as to facilitate the rubberizing step, by enabling access of the blend to the cross section and penetration thereof along the cord axis. The cord is preferably used as a reinforcing element for the belt structure.