Signals and indicators – Horns – whistles and compressional wave generators
Patent
1982-03-19
1984-03-20
Yasich, Daniel M.
Signals and indicators
Horns, whistles and compressional wave generators
116 22A, 116 28R, 116 623, B06B 100, G08B 300
Patent
active
044374283
ABSTRACT:
A device for generating warning signals consisting of sound waves at frequencies between 14 and 26 kHz, preferably intended to be mounted on a motor vehicle so that the device will be actuated by the wind. The device operates similar to a flue pipe and generates a subatmospheric pressure behind the sharp edge of the flue pipe. The subatmospheric pressure is created by a passage continuing to a resonant chamber, open at its rear end, the passage being larger in cross-section than the resonant chamber. The passage is formed in a body which has substantially the shape of a frustum of a cone and is formed with longitudinal through slots which extend from the passage. With this design, a subatmospheric pressure is generated which excites the pipe to vibrate even in a relatively slow wind.
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