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尤其是报警器外壳的机箱设计十分不适合体型小，必须隐敝防止别人 毁坏等当代报警器的必须急缺改善。 尤其可用报警器机壳以及安装方法。该机壳可以完成(一)顶盖能支撑点到下壳上，顶盖可在下壳的通 道旋转且能明确打开和关掉部位，且无需螺丝，十分有利于检修；
In particular, the case design of the alarm shell is not suitable for small size, so it must be hidden to prevent others from being damaged. The contemporary alarm must be urgently improved. In particular, the alarm casing and installation method can be used. The casing can complete (1) the top cover can support the point to the lower shell, the top cover can rotate in the channel of the lower shell, and the opening and closing parts can be clearly defined without screws, which is very conducive to maintenance;
(二)彻底消除了安裝工作人员一直在 人字梯顶部实际操作沒有室内空间置放顶盖的情形下，安裝工作人员务必先蹬上人字梯先安裝报警器下壳至支撑点构造 ，随后再上人字梯将报警器顶盖螺装在下壳上的缺点。
（2） The utility model completely eliminates the disadvantage that when the installation workers have been operating at the top of the herringbone ladder and there is no indoor space to place the top cover, the installation workers must step on the herringbone ladder first, install the lower shell of the alarm to the structure of the support point, and then go on the herringbone ladder to screw the top cover of the alarm on the lower shel