| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas alarm preventing a case body from being disassembled and capable of being formed seal-less.SOLUTION: A projection part 225 formed on a lower case 22 into which an insertion hole 216 formed on an upper case 21 is inserted. A top end part 225A of the projection part 225 is thermally deformed so that the upper case 21 and the lower case 22 are fitted each other. It is difficult for a user to break the projection part 225, and even if the top end 225A after deformed is not hidden, it is possible to make the case body 2 hard to be disassembled. There is no need to paste a seal member as before, and the case body 2 can be formed seal-less while being made not to be disassembled.SELECTED DRAWING: Figure 4 |
