Abstract This invention relates to radial-ply tires having a reinforced breaker layer and a carcass that comprises a plurality of superimposed layers of cord fabric and the invention consists in helically winding a strip of carcass fabric of constant width and constituted of substantially transverse cords, on a cylindrical drum, thereby helically shifting the side edges of the strip and thus obtaining in the beads of the finished tire a staggering of the edges of the layers of carcass. In one embodiment, a first strip of carcass fabric of constant width is helically wound and the side parts of said strip are folded from the inside to the outside around the bead wires, whereafter a second helically wound strip of the fabric is superimposed on the first strip but the side parts of the second strip are folded from the outside to the inside around the bead wires. The edges are preferably helically displaced.
A radial-ply tire having a reinforcing breaker layer, and a carcass which comprises a plurality of superimposed layers of cord fabric provided by a strip of cord fabric, of constant width and having cords extending transversely substantially at 90* with respect to the longitudinal axis of the strip, wound with successive turns of the strip positioned helically, the side edges of the carcass layers being thereby staggered, the tires having side walls and bead wires arranged in the lower part of each of the side walls and the staggered edges on each of the respective sides of the carcass layers being folded around the bead wires and terminating within a respective side wall.
Claim 2
Dependent Claim
113 words
A radial-ply tire having a reinforcing breaker layer, and a carcass which comprises a plurality of superimposed layers of cord fabric provided by a strip of cord fabric, of constant width and having cords extending transversely substantially at 90* with respect to the longitudinal axis of the strip, wound with successive turns of the strip positioned helically, the side edges of the carcass layers being thereby staggered, the tires having side walls and bead wires arranged in the lower part of each of the side walls and the staggered edges on each of the respective sides of the carcass layers being folded around the bead wires and terminating within a respective side wall.
Claim 3
Dependent Claim
127 words
A radial-ply tire according to claim 1 having the staggered edges of the carcass layers folded around the respective bead wires from the inside to the outside of the tire, a second strip of cord fabric superimposed upon the first mentioned strip and wound with successive turns of the second strip positioned helically, the side edges of the second strip being thereby staggered and being folded around the bead wires from the outside to the inside of the tire wherein the first mentioned strip has a width greater than the meridian width between the bead wires of the tire, and its side edges are situated in the part of the respective side walls of the tire between the middle of the side walls and the bead wires.
Claim 4
Dependent Claim
47 words
A tire according to claim 2 wherein the second strip has such a width and is so arranged that the staggered side edges are terminated within the side walls of the tires at a radial distance from the axis less than that of the respective bead wires.