| 摘要 |
PROBLEM TO BE SOLVED: To prevent the intrusion of water and to improve strength, by providing the correspondence between a top part provided at a lower cover and a concave part provided at an upper cover so that the upper part is closed, and arranging the inner lower end of the upper cover lower than each connecting part of an electric device. SOLUTION: At the outer upper part of the surrounding wall of a lower cover 11, a flange 14 and a step difference 15 are formed at the upper and lower sides. At the upper-end outside, a slant surface 16 is formed. At the outer wall of the lower cover 11, a plurality of hooks are formed as a unitary body. At the surrounding edge part of an upper cover 13, a skirt part 22 is formed along the outer surface. A coupling groove 23 wherein the upper part is closed and the lower part is opened, is provided at the part between the upper cover 13 and the skirt part 22. A step difference 24 in correspondence with the step difference 15 is formed at the skirt part 22. A slant surface 25 is formed at the lower-end outside of the upper cover 13. An engaging part is formed as a unitary body at the position in correspondence with a hook 17 formed at the upper cover 13 at the outer wall of the skirt part 22. Then, the upper closed part of the coupling groove 23 of the upper cover 13 is in contact with the upper end of the surrounding wall of the lower cover. The step difference 24 is in contact with the step difference 15. The lower end of the skirt part 22 is in contact with the flange 14. |
