| 摘要 |
The bar (1) has a concave inner surface (3), and a convex outer surface (2), with a web (4) which extends from the inside to the outside, and is support the inner surface and the web may be formed in one piece by rolling, and the internal chambers (6) formed by the web may be filled with a synthetic material, such as polyurethane foam. The radius o the inner surface may be between 48mm and 50mm, and that of the outer surface may be between 125mm and 128mm. The width of each bar may be 77mm, and the thickness may be 25mm. |
