| 摘要 |
PROBLEM TO BE SOLVED: To prevent floating of a gasket fitted in a groove of a case. SOLUTION: A groove 16 is formed on a peripheral edge of an opening of a case body 11. Projections 21 a little expanded compared to the width of the groove 16 are formed on center portions of at least longer sides of a gasket 17 to be fitted to the groove 16. In assembling, the projections 21 of the respective sides of the gasket 17 are sequentially pushed between the side walls of the groove 16. The gasket 17 is fitted to the groove while temporarily fixing by means of the projections 21. With such a setup, it is possible to prevent floating of a part of the gasket 17 from the groove 16, due to the presence of the projections 21, after the fitting. Re-fitting of the gasket 17 is not required for improving assembling operability. In addition, a cover 14 is not covered over the gasket 17 which is forced out from the groove 16 partially. Insufficient waterproofness caused by malfunction of the assembling of the gasket 17 is also prevented.
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