Patent ID: 6117269
Filing Date: 2000-09-12
Classification: B29D,Y10T

Abstract:
An apparatus for looping up a coating structure on a motor-vehicle tire bead core comprising:a support drum;an inflatable air bag having two circumferential anchoring beads coaxially fastened to the support drum, two connecting portions extending mutually away from said anchoring beads and one work portion radially external to said drum and extending between opposite ends of said connecting portions;a plurality of radially moveable clasping sectors distributed circumferentially on the drum and radially movable relative thereto between a rest position in which they are radially retracted towards the drum, and a work position in which they are radially extended and project from the drum in order to urge said work portion of the air bag against the radially internal surface of a tire bead core which is coaxially positioned on the drum;fluid feeding means communicating with the inside of the air bag for inflating said air bag from a deflated condition in which it is disposed substantially flattened in a cylindrical configuration against said drum to an inflated condition in which it is radially expanded so as to form first and second lobes located on axially opposite sides relative to said plurality of clasping sectors urged against said bead core;only one annular opposition bell, said annular bell to be coaxially positioned around the air bag to counteract the radial expansion of said first lobe, means for mounting said annular bell to be axially movable relative to the drum for enfolding the first lobe around one side surface and the radially external surface of the bead core;the radially movable clasping sectors being movable relative to the support drum surface including the parts of the drum supporting the rest of the air bag.