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AssigneeCompagnie Generale Des Etablissements Michelin
InventorsYann Faure, Raphael Martinez
Estimating the term…
The method comprises a braiding step during which a braiding wire is wound in helical turns about, and along, a generatrix line which is closed in a ring about a main axis, so as to form a bead wire element called “braided torus” within which the braid wire has, on the one hand, a winding section which corresponds to the helical turns and which occupies a braid volume, and, on the other hand, in an extension of said winding section, a surplus length of braid wire called “excess section”. After the braiding step, there is a folding step during which the excess section is plastically deformed by folding, preferably by means of a punch and an anvil, so as to form an elbow which makes the excess section diverge with respect to the helical turns and makes said excess section protrude at least partly with respect to the braid volume.
A method for producing a bead wire intended for the reinforcement of a tire, said method comprising a braiding step during which a braid wire is wound in helical turns about, and along, a generatrix line which is closed in a ring on itself about a main axis, and a plurality of complete turns in azimuth about the main axis is thus described with said braid wire, so as to form, about said main axis, a braided torus that includes a bead wire element, the bead wire element having a winding section that is a portion of length which corresponds to the helical turns and which occupies a braid volume, and the bead wire element also having in an extension of said winding section, an excess section that includes a surplus length of braid wire, wherein, after the braiding step, the method further comprises a folding step during which the excess section is deformed plastically by folding, so as to form an elbow which makes the excess section diverge with respect to the helical turns and makes said excess section protrude at least partly with respect to the braid volume of the braided torus.
An installation for producing bead wires intended for the reinforcement of a tire, such as a pneumatic tire, said installation comprising a braiding station which comprises a guiding support which defines a path which follows a generatrix line which is closed in a ring on itself about a main axis, a reel arranged to bring a braid wire preferably metallic, and to cooperate with the guiding support in order to wind said braid wire in helical turns about, and along, said generatrix line so as to form, through a plurality of turns about said main axis, a braided torus that includes a bead wire element, the braid wire having a winding section that includes a portion of length which corresponds to the helical turns and which occupies a braid volume, and the braid wire also including an excess section that is an extension of said winding section which includes a surplus length of braid wire, wherein the installation also comprises a folding tool, distinct with respect to the reel, and arranged to recover, after the braiding operation, the excess section and perform a plastic folding of said excess section so as to form an elbow which makes the excess section diverge with respect to the helical turns and makes said excess section protrude at least partly with respect to the braid volume of the braided torus.
Dependencies are inferred from the claim text.