| 摘要 |
The audible alarm device comprises a coupling assembly, a chamber assembly and an air horn assembly, releasably separable from each other. The coupling assembly and the chamber assembly are movable by squeezing action so that in one relative position pressurized air from an air inlet in the coupling assembly is allowed through a valve assembly into an interior chamber in the chamber assembly, the air driving a bi-stable piston into repeated contact with a percussion diaphragm, producing a below surface audible sound. An exhaust passage permits air to pass from the interior chamber to the surrounding environment. When the coupling assembly and the chamber assembly are moved by diver action to a second relative position, the exhaust passage is blocked, forcing air in the interior chamber to exhaust to the air horn assembly, which produces an audible sound above the water surface.
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