| 摘要 |
PROBLEM TO BE SOLVED: To prevent a part cover from dropping out unexpectedly from a cover box and leave it to be pressed into the inside of the cover box for smooth operation. SOLUTION: In the structure for fitting a partial cover 7, a box 4 for alarm monitoring board is provided with a base box 4a and a cover box 4b. A pair of spring members 12 and 12, which are widened between the rear 4b2 side and the surface 4b1 side of the cover box 4b when they are extended and contracted elastically in a direction to cover an opening 5a and no outer force is given, are provided in the periphery of the opening 5a, and a pair of claws 10 and 10 extending from the other end part 7c of the partial cover 7 are provided. In the case where the partial cover 7 is pressed in the box 4 while the partial cover 7 is opened in a manner that a recessed part 5 can be seen, even if the partial cover 7 is pressed in the direction from the surface 4b1 to the rear 4b2 of the cover box 4b, the claws 10 and 10 are hooked at the surface 4b1 side of the spring members 12 and 12. Thus, the partial cover 7 can be prevented from dropping out from the cover box 4b.
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