| 摘要 |
690,719. Pneumatic tyres. UNITED STATES RUBBER CO. Oct. 31,1951 [Feb. 21, 1951], No. 25425/51. Drawings to Specification. Class 144 (ii). A method of making pneumatic tyres having plies of transverse cords comprises (a) building the tyre undersize with ingredient in the bead areas to activate local vulcanization; (b) vul. canizing the bead areas-before or after shaping-without vulcanizing remainder of tyre; (c) expanding the tyre to stretch the cords and completing vulcanization whilst maintaining the cords in stretched condition. |
