| 摘要 |
PROBLEM TO BE SOLVED: To improve the drainage by a method wherein ribs whose tips are formed into circular-arc shapes are made to protrude from the circumferential edges of a drain hole and water flowing along the ribs are collected on the tips of the ribs and dropped. SOLUTION: Ribs 3 whose tips are formed into circular-arc shapes are made to protrude from the circumferential edges of the drain hole 1 of the lower case 2 of an electrical junction box. The ribs 3 have semi-circular shapes and are made to protrude from the respective facing sides of the square drain hole 1. Water flows on the bottom of the lower case 2 and flows down along the ribs and is drained. The shape of the rib is not restricted except that the tip part must be circular-arc shaped. The number of the ribs are not limited either. As a result, water entering the electrical junction box can be drained easily by flowing along the ribs, so that the drainage can be significantly improved. |
