| 摘要 |
414,885. Making hollow - ware. CHESTERFIELD TUBE CO., Ltd., Derby Road, Chesterfield. June 28, 1933, No. 18445. Convention date, July 1, 1932. [Class 83 (ii).] A metal container for high-pressure fluid having a series of bulbous portions a connected by necks b is formed from a cylindrical body c by thickening the neck portions by rolling, pressing, or like operations before forming the bulbous portions. The neck portions of the cylinder may first be reduced in diameter and thickened, and the cylinder expanded between them, e.g., by fluid pressure to form the bulbous portions. The pressing or rolling tools d may have fluted faces. |
