| 摘要 |
PROBLEM TO BE SOLVED: To provide a ring for which a manufacturing cost can be lowered and distortion is easily corrected while making it easy to pass through a joint of a finger and making it difficult to rotate when it is put on, and to provide a ring mandrel.SOLUTION: A chord part 4 for rotation stop is formed on the inner side of a ring body 2, and the chord part 4 and a round circular arc part 5 are formed on the inner side of the ring body 2. Then, when the ring body 2 is pushed into a ring mandrel 7 where a flat part 9 is formed, a gap S is formed between the chord part 4 and the flat part 9 of the ring mandrel 7. |
