| 摘要 |
<p>The invention concerns a radially expansible assembly drum (1) for making a tyre, said drum having a body mounted on a central shaft (3) having a generally cylindrical surface for receiving products to be assembled and ends with different diameters, the drum comprising a lifting device (20, 21) located at each end of the drum body having an outer cylindrical surface (221, 231) for receiving products to be assembled. The invention is characterised in that the lifting device (21) arranged proximate to the end with the smaller diameter is radially mobile relative to the body (10) of the drum (1) between a position wherein its surface (231) has substantially the same diameter as that of the central surface of the body (10) and a position wherein its surface (231) has a diameter smaller than that of the central surface of the body (10), the radial displacement of said retracting device (21) being synchronised with the radial expansion of the drum (1).</p> |
