| 摘要 |
PROBLEM TO BE SOLVED: To exchange a mothproof perforated plate simply in single operation. SOLUTION: A mothproof perforated plate 7 is inserted into a fitting groove 5 by forcibly fitting a ring-shaped packing 8 to a cylindrical body 4 as being deformed while being removed from the fitting groove 5 by forcibly extracting the ring-shaped packing 8 from the cylindrical body 4 as being deformed. Accordingly, when the mothproof perforated plate 7 is damaged, etc., the mothproof perforated plate 7 can be exchanged simply in single operation. |
