| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage to a ball chain, by idly fitting the free end of a mounting piece into a ring groove formed between a mounting seat projectingly formed on the base of a screw shaft and a receiving seat projectingly formed on the base of a projection onto which a tool is hooked, thereby preventing the mounting piece from being restrained by the tool during screwing. SOLUTION: A screw stopper 7 is connected via a ball chain 9, a connecting strip 10, and a mounting piece 11, to a chain-mounting device fixed to a side wall with a fastening screw. Here, on the mounting seat 13 of the screw stopper 7, on which a screw shaft 12 is projectingly formed, the hexagonal head 14 of a screwing tool, which can be released from a fitted state, is projectingly formed opposite the screw shaft 12 and on the same axis as that of the screw shaft 12. Further, on the base end of the hexagonal head 14 a receiving seat 15 is projectingly formed to form a ring groove 16 between the receiving seat 15 and mounting seat 13. In the case a spring wire is used as the mounting piece 11 in the ring groove 16, a coiled portion 22a is formed at the free end of the mounting piece 11, and it is increased in diameter and idly fitted in the ring groove 16. |
