| 摘要 |
PROBLEM TO BE SOLVED: To cause a protrusion to be fitted in the recessed part of the bottom plate of a partition member and to perform positioning such that an opening is brought into a down state. SOLUTION: This coupling device consists of an outer fit-in member 20, an inner fit-in member 21, a partition member 22, and a filter member 23. Cylindrical protrusions are uniformly formed on the inner fit-in member 21. Female screws are formed in all of the cylindrical protrusions. A recessed part 43 is formed in the partition member 22. When the partition member 22 is mounted, combination of the recessed part 43 of the partition member 22 and the protrusion of the inner fit-in member 21 is selected.
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