| 摘要 |
<p>A one-piece seat tube for a bicycle is made by a single forging forming embryo and has a body (10, 10A, 10B, 10C) and a protruding segment (20, 20A, 20B, 20C). The body (10, 10A, 10B, 10C) is hollow and has an annular external surface (11, 11A, 11B, 11C), an upper end, a middle and a lower end. The protruding segment (20, 20A, 20B, 20C) is integrally formed on the external surface (11, 11A, 11B, 11C) of the body (10, 10A, 10B, 10C).</p> |
