| 摘要 |
<p>The inner tube 1 has a right- cylindrical portion 3 whose axis of symmetry is coincident with that of the toroidal body. The inflation valve for the tube is mounted in the portion 3 with the result that the mounting is more secure than in conventional inner tubes because said portion has only one radius of curvature. The apparatus for making the inner tube comprises half-moulds 15,16 closeable around a core 17 to define a cavity into which elastomeric material is injected, said core and one of said half-moulds having facing surfaces which are right-cylindrical and coaxial with the mould as a whole. The inflation valve 4 is mounted, before closing the half-moulds onto the core, in one half- mould 16 in such a manner that the injected elastomeric material (in filling said cavity) flows around one end of the valve. <IMAGE></p> |
