| 摘要 |
1498894 Tyre building apparatus PHOENIX GUMMIWERKE AG 7 April 1975 [17 April 1974] 14197/75 Heading B7C Tyre building apparatus comprises a centre drum 1 carrying a diaphragm 3, means for introducing fluid under pressure between the diaphragm and a cylindrical tyre carcase supported on the diaphragm to shape the carcase to toroidal form, an end drum 2 adjacent each end of the drum 1, and a respective bead core support ring 6 in each space between an end of the drum 1 and the adjacent drum 2, each ring 6 being radially expansible and having a radially inwardly directed annular flange 8 which, in the unexpanded state of the ring, Fig. 1, has concentric annular pleats 12, the pleats being straightened by the action of pressurized fluid on the ring in use, Fig. 2, so as to radially expand the ring. Each ring 6 may as shown act conjointly with a radially expandable ring 7 to form a bellows, the ring 7 having a flange 9 which, in the unexpanded state, has pleats 15 in a mirror-image relationship to those of the ring 6. Each ring 7 supports an edge of a ply turn-up bladder 4 mounted on the adjacent end drum 2, the drum 2 also being provided with a further turn-up bladder 5. In use carcase plies 16, 17 may first be laid on the diaphragm 3 and bladders 4, 5 and then bead cores 18 are positioned over the rings 6. Air is then admitted to the bellows formed by the rings 6, 7 to radially extend the rings so that the plies 16, 17 are gripped against the cores. Thereafter air may be admitted between the ply 17 and diaphragm 3 and the bladders 4, 5 subsequently inflated to turn the ends of the plies 16, 17 up around the cores. |
