Process of fabricating hollow bead rings
AssigneeCompagnie Generale Des Etablissements Michelin
InventorJean Lefrancois
Life of this patent
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Abstract
Process of fabricating hollow bead rings for the beads of pneumatic tires, said hollow bead rings having a radial cross-section with at least one interior partition which connects together two portions of the outer contour, is improved by using the following operations: (a) extruding, by means of an extruder whose orifice is equipped with a single mandrel, a hollow member whose interior partition is connected to a single one of said portions, the other end of the interior partition being free, and (b) deforming, in one or more steps, the radial cross-section of the hollow member until the free end of the interior partition comes into contact with the other portion of the outer contour.
Claims11
Process of fabricating a hollow bead ring for a bead of a pneumatic tire, said hollow bead ring having a radial cross-section with at least one interior partition which connects together two portions of the outer contour, characterized by the fact that it comprises the following operations:
- (a) extruding, by means of an extruder whose orifice is equipped with a single mandrel, a hollow member whose interior partition is connected to a single one of said portions, the other end of the interior partition being free,
- (b) deforming, in one or more steps, the radial cross-section of the hollow member until the free end of the interior partition comes into contact with the other portion of the outer contour,
- (c) cutting the hollow member into suitable length,
- (d) bending the hollow member to the desired diameter, and
- (e) connecting the ends of the bent hollow member together by welding;
- said operations (c), (d) and (e) being performed either before or after said deforming operation (b).
Dependencies are inferred from the claim text.