Whistle

Details Whistle Whistle

2011-08-30

2011-08-30

Smith, R. A. (Department: 2841)

Signals and indicators

Horns, whistles and compressional wave generators

C446S204000

Reexamination Certificate

active

08006634

ABSTRACT:
An object of the present invention is to provide a whistle which has a resonance frequency shifted to the low-frequency side and a pleasant tone while retaining a compact size and light weight. In order to attain this object, a whistle comprises a mouthpiece portion, inside which an air passageway is formed and in which an air opening is opened, and a body portion, in which a connected resonance chamber that is connected to the air passageway is formed; the connected resonance chamber comprises a first resonance chamber, a second resonance chamber in which a sound-emitting opening is opened, and an orifice connecting the first resonance chamber and the second resonance chamber.

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patent: 2010/0261403 (2010-10-01), Shishido
patent: 39-21231 (1939-07-01), None
patent: 2002-108345 (2002-04-01), None

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