Abstract: A method for the production of patch-rubbers intended to repair radial-ply and bias-ply tires. The patch-rubbers, although having the same strength as those known, are more flexible and do not affect the original mechanical features and performances of the regions of the tires repaired therewith, and are also suitable to perform retreading operations on tires by both high pressure molding machines and autoclaves. The method consists in superposing the plies (1a, 1b), embedding a fabric made by fiber cords, in such a way that their medium axes diverge from the longitudinal or symmetry axes A of the patch-rubbers, and in superposing on the plies, a further ply (2) of smaller area having rectilinear metallic cords forming a different angle with the above mentioned axes A.

Abstract: A trapezoidally-shaped rubber patch for patching the sidewall of a radial-ply tire with broken or damaged cords. The rubber patch has a first layer of rubber containing radial metallic cords and at least one second layer of rubberized fabric with synthetic cords under the first layer. Beneath the second layer is at least one third layer of rubber. The patch has a knurled attachment surface for attaching it to a coresponding knurled tire attachment surface. The rubber patch also has a trapezoidally-shaped rubber plug extending outwardly from the attachment surface. The rubber plug fits into a window which is cut in the sidewall of the tire in the area of the broken or damaged cords. The first layer of rubber is raised with respect to the attachment surface. The first layer of rubber is as wide as the base of the plug in the area beneath it.