| 摘要 |
A mouth blown sports whistle includes a mouthpiece that communicates with a sound chamber and emits an audio signal when pressurized air is blown into the mouthpiece and a second chamber that communicates via a passageway with the sound chamber. A visual member is housed in the second chamber in a retracted position so as to be capable of extending through an opening therein to an extended position when pressurized air enters the second chamber from said sound chamber to thereby render a visual signal of the blowing of the whistle. The whistle may further include a check valve associated with the second chamber to temporally hold the visual member in its extended position after the extension thereof and also a release valve associated with the second chamber to permit the visual member to return to its retracted position to ready the whistle for another combined audio and visual signalling.
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