| 摘要 |
A siren housing has a dish-shaped base having a back wall adapted to be secured to as support structure. The base is configured and dimensioned to contain siren components. A post projects forwardly from the back wall. The post has a cylindrical side wall terminating at a front rim. At least one channel circumscribes a segment of said side wall at a location spaced rearwardly from said front rim. Entry and exit slots communicate with said channel at spaced locations along the length thereof. The entry slot leads to said front rim and the exit slot leading towards said back wall. A dish-shaped cover has a front wall. A cylindrical sleeve projects rearwardly from said front wall, said sleeve having at least one pin projecting radially inwardly therefrom. The sleeve is dimensioned for axial insertion onto said post. The pin is arranged: 1) to enter said channel via said entry slot; 2) to coact with said channel in supporting said cover above said base for movement between open and closed positions; and 3) to exit said channel via said exit slot to accommodate seating of said closed cover on said base.
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