| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain coupling for a rainwater gutter having a mechanism absorbing expansion/shrinkage of an eaves gutter due to a change of an outside air temperature, facilitating construction, and preventing a drain connection part from separating out after construction. SOLUTION: This drain coupling for the rainwater gutter is provided with a drain coupling main body 1 having a mounting part 12 projected above a cylindrical outfall 11 and an external thread part 14 formed on the outside of the cylindrical outfall 11, a connection member 2 having a locking part 23 projected on the outside wall side of a short cylinder body 21 and an internal thread part 24, which is formed on the inside wall side and screwed to the external thread part 14 in the cylindrical outfall 11, a receiving port body 3, in which an opening part 31 receiving the outfall 11 screwed to the connection member 2 is arranged in the upper part while a downspout fitting part 33 is arranged in the lower part, and a lid body 4 having an oblong-hole insertion hole 45 mounted to the opening part 31 fixably. The upper part side of the short cylinder body 21 is inserted into the insertion hole 45 in the lid body 4, and the locking part 23 is engaged around the insertion hole 45 freely slidably in the longitudinal direction of the oblong hole.
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