| 摘要 |
PROBLEM TO BE SOLVED: To provide a hole plug that can improve durability.SOLUTION: A drain outlet 40 is formed in a housing 20 of a hole plug 10, and a shaft 44 of a flap valve 42 is rotatably and pivotally supported by a bearing 47 of the housing 20. A coil spring 50 is provided on the bearing 47 of the housing 20. When a quantity of water inside the housing 50 increases, the flap valve 42 rotates against a biasing force of the coil spring 50 by water pressure and opens the drain outlet 40 to drain water. In such a manner, it is configured that the shaft 44 of the flap valve 42 rotates with respect to the bearing 47 of the housing 20, thereby preventing fatigue failure of the flap valve 42 due to its elastic deformation at each time of opening and closing. |
