| 摘要 |
The invention relates to a radially expandable assembly drum ( 1 ) for the manufacture of tires, said drum having a body mounted on a central shaft ( 2 ) having a generally cylindrical central surface for receiving the products to be assembled and ends of different diameters, the drum comprising a lifting device ( 20, 21 ) located at each end of the body of the drum having a cylindrical outer receiving surface ( 221, 231 ) for products to be assembled, characterized in that the lifting device ( 21 ) arranged close to the end of lesser diameter is radially displaceable 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 less than that of the central surface of the body ( 10 ), the radial displacement of this lifting device ( 21 ) being synchronized with the radial expansion of the drum ( 1 ). |
