| 摘要 |
A fire detector includes both a detector unit and a detector base including a base block to which the detector unit is mounted. The detector unit has an outermost peripheral wall, an engaging portion located inwardly of the outermost peripheral wall, and connecting members of a bayonet coupling. The detector base includes coupling members of a bayonet coupling engaged with the coupling members of the detector unit. The bayonet coupling is locked in place by a locking spring of the base block of the detector base, which locking spring engages the engaging portion of the detector unit. A pair of spaced apart connecting terminals for connection with a power and signal line are fixed on the base block. These terminals have small holes, respectively. A jumper spring having a main portion and bent ends is connected to the terminals by inserting the bent portions of the spring into the small holes, to thereby produce a short-circuit which allows the detector base to be inspected prior to the mounting of a detector unit to the base block. The jumper spring may be readily pulled from the terminals even once the base block has been mounted to the ceiling.
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