| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for preventing mixing of foreign matters in a bent pipe capable of quickly putting a lid on the bent pipe by a simple operation. SOLUTION: A lid body 1 is formed by fixing a circular cloth 3 on a circular flexible wire 2. The flexible wire 2 is twisted and folded into the circular shape smaller than the original circular shape, and the folded lid body 1 is inserted into a bent pipe opening portion from between cover legs of the bent pipe, and mounted on the bent pipe opening portion by restoring force of the flexible wire 2. COPYRIGHT: (C)2006,JPO&NCIPI
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