| 摘要 |
PROBLEM TO BE SOLVED: To provide a perforated plate for floor drain of a bathroom that can prevent back flow and shut off malodor when the rubber seal is broken by operating a rubber valve in an instant. SOLUTION: In this perforated plate 3 for drain mounted to a floor face 1 of the bathroom, a lower valve seat face P2 is formed below an upper valve seat face P1 on the upper face side of the perforated plate 3, and a rubber valve 6 is internally mounted in a vertically movable manner between the upper valve seat face P1 and the lower valve seat face P2. If the inside of the perforated plate 3 is in a full water state, the rubber valve 6 comes in close contact with the upper valve seat face P1 to prevent back flow, and when the rubber seal is broken, the rubber valve 6 comes in close contact with the lower valve seat face P2 to shut off malodor. |
