Whistle
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United States of America Patent
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Jul 15, 2014
Grant Date -
Dec 29, 2011
app pub date -
Jun 23, 2011
filing date -
Jun 28, 2010
priority date (Note) -
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Abstract
A whistle includes: an air supply opening; a first resonance chamber, a second resonance chamber and a third resonance chamber; a first air supply passage, a second air supply passage and a third air supply passage that branch from a common air supply passage; and a first sound emitting opening, a second sound emitting opening and a third sound emitting opening that emit sounds generated in the first resonance chamber, the second resonance chamber and the third resonance chamber, respectively. The first resonance chamber and the second resonance chamber are arranged side by side in a planar view. The third resonance chamber is disposed between the first resonance chamber and the second resonance chamber, as well as upside the first resonance chamber and the second resonance chamber. The first sound emitting opening, the second sound emitting opening and the third sound emitting opening are open upward.
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