Signals and indicators – Horns – whistles and compressional wave generators
Patent
1982-02-01
1984-02-07
Stephan, Steven L.
Signals and indicators
Horns, whistles and compressional wave generators
116DIG19, B06B 118
Patent
active
044296568
ABSTRACT:
A toroidal shaped closed chamber whistle produces a warning signal capable of being easily heard at relatively great distances from the whistle. The toroidal whistle emits a bidirectional sound which is phase-locked to a particular pitch. The toroidal whistle has a circular plate positioned within a hollow cylinder to form an air passage leading to an annular air slit. Incoming air under pressure flows through the air passage and out of the annular air slit into a toroidal chamber. Within the toroidal chamber, a sound wave is formed which passes out of the toroidal chamber through a chamber mouth. Optionally, two toroidal chambers can be used in combination to produce a dual-tone sound. Additionally, a tremulant device can be used to produce a warbling effect in the emitted sound.
REFERENCES:
patent: 48921 (1865-07-01), Fitts
patent: 596257 (1897-12-01), Bartlett
Corr Denis E.
Stephan Steven L.
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