Patent ID: 6983782
Filing Date: 2006-01-10
Classification: B29D

Abstract:
1. A radially expandable assembly drum ( 1 ) for the manufacture of tires, said drum having a body mounted on a central shaft ( 2 ) having a substantially cylindrical central surface for receiving the products to be assembled and having ends of different diameters, said drum further comprising a lifting device ( 20 , 21 ) located at each end of the body of said drum having a cylindrical outer receiving surface ( 221 , 231 ) for products to be assembled, characterized in that said lifting device ( 21 ), arranged close to an end of lesser diameter, is radially displaceable relative to said body ( 10 ) of said drum ( 1 ) between a position wherein said receiving surface ( 231 ) has substantially the same diameter as that of said central surface of said body ( 10 ) and a position wherein said surface ( 231 ) has a diameter less that that of said central surface of said body ( 10 ), and wherein the radial displacement of said lifting device ( 21 ) is synchronized with the radial expansion of said drum ( 1 ), and wherein said radially displaceable lifting device ( 21 ) comprises at least one first bearing surface ( 251 ) intended to cooperate with a first stop ( 151 ) carried by said drum ( 1 ) and fastened radially relative to the central shaft ( 2 ), and at least one second bearing surface ( 252 ) intended to cooperate with a second stop ( 432 ) carried by and integral radially with said body ( 10 ), such that each of the two radial positions of said lifting device ( 21 ) relative to said body of said drum corresponds to a contact of one of said stops with said corresponding bearing surface of said lifting device.