| 摘要 |
A detector base which is installed on a ceiling prior to mounting a fire alarm on the ceiling has a base block for mounting a detector, the base block including an opening which is located outside of the periphery of the detector when the detector is mounted; a locking spring having one end secured to the base block and the other end being a free end, the spring being placed in a position facing outwards via the opening; and engaging means provided for a movable portion of the locking spring and being engaged with the detector. Another detector base has a base block for mounting a detector; a pair of connecting terminals having the same polarity fixed on the base block so as to be located spaced apart from each other and the pair of connecting terminals having small holes, respectively; and a short-circuiting device for electrically connecting the both pair of connecting terminals by inserting both ends of the shortcircuiting device into the small holes formed on the pair of the connecting terminals such that they can be detached from each other, respectively. Unauthorized removal of the fire alarm is prevented.
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