| 摘要 |
Ball (1, 21), composed of flat equilateral parts of a first type (2; 22) and a second type (3; 23), which are identical in terms of each type and where the parts of the first type are triangular, the sides of a triangular part are longer than the sides of a part of the second type, the parts are arranged three-dimensionally around a ball centre in such a way that each side of a triangular part, on either side of an intermediate point (7; 27) on the side, from each end of the side to the intermediate point respectively adjoins one side of another triangular part (2; 22) and one side of a part of the second type (3; 23). The ball is suitable for containing a pressurized medium. The sides of the triangular parts (2; 22) are so much longer than the sides of the parts of the second type (3; 23) that each part of the second type (3; 23) and each of four triangular subsections (8, 9; 28, 29) which are formed between the corners and intermediate points of each triangular part (2; 22) can be circumscribed by substantially identical circles. |
