| 摘要 |
1498653 Moulding tyres CATERPILLAR TRACTOR CO 17 April 1975 [12 June 1974] 15908/75 Heading B5A [Also in Division B7] A tube-tyre carcass is formed by helically wrapping elongate resilient material about and along substantially the entire body of a disintegrable toroidal core, helically winding elongate flexible substantially inextensible material about and along substantially the entire body of the core, helically wrapping additional elongate resilient material about and along substantially the entire body of the core, and applying a vacuum in the area of the substantially inextensible material between the first mentioned resilient material and the additional resilient material. In the preferred method the carcass is formed by winding layers of rubber material 22, 41, substantially inextensible material 46 such as wire, and rubber bond material 48 sequentially around a toroidal, porous sand core while the latter is rotated about its axis. After winding the rubber material 22, a vacuum is applied to the core via valve fittings 24, 26, and the material is stitched by means of stitching rollers 40, 42 rotated around the core while the latter is rotated. The rubber material 41 is similarly stitched (stitching may take place only after application of the material 41). The substantially inextensible material 46 is then wound on to the core, and the vacuum is released. Rubber bond stock is applied to the areas of the valve fittings, if necessary, and pressure is applied via the valve fittings to check for leaks. The rubber bond material 48 is then wound around the core, followed by rubber layers 50, 52 applied circumferentially of the carcass. A stitching roller 56, replacing rollers 40, 42, is rotated around the core while the latter is rotated about its axis so that rubber material 48 is forced into the spaces between the convolutions of the material 46, and simultaneously air pockets in layer 46 are evacuated via probe 54. The latter is moved periodically to adjacent the stitching operation. |
