| 摘要 |
PROBLEM TO BE SOLVED: To avoid the formation of a gap at seal portions of casings and the occurrence of strain of the casings by providing a place where a volume of a spur crushed when the casings are fitted to each other is released, in a waterproof structure of the casings. SOLUTION: A groove 3 is provided at a seal portion of a casing 1 over its entire circumference, and silicone is applied to the groove 3 to form a spur part 4 adhering closely to the groove 3 and capable of being deformed elastically. Silicone 7 having low hardness is applied to a bottom face of the groove 3, and silicone 8 having high hardness is then applied to the top portion of the silicone 7. Thus, the spur part 4 is formed of two kinds of the materials different in hardness. Further, a protrusion 5 is provided at a seal portion of a casing 2 over its entire circumference. When the casings 1, 2 are fitted to each other to be clamped with screws, the protrusion 5 crushes the spur part 4, and waterproofness can be maintained. In this instance, the silicone 8 having high hardness is elastically deformed, and the silicone 7 having low hardness can release a volume of the silicone compressed and crushed. |
