Signals and indicators – Horns – whistles and compressional wave generators
Patent
1994-04-07
1996-08-20
Will, Thomas B.
Signals and indicators
Horns, whistles and compressional wave generators
G10K 500
Patent
active
055468870
ABSTRACT:
An emergency signalling whistle which simultaneously emits high- and low-pitched whistle tones so as to be detectable from relatively long distances and localizable from relatively short distances. A mouthpiece contains first and second air passages which discharge across openings into chambers of different sizes. The whistle also incorporates cylindrically concave grip surfaces which align with the ends of the person's thumb and forefinger in the grip position. In addition, there is an enlarged flange at the end of the mouthpiece which is retained in the person's mouth by the incisor teeth, and a second flange around the mouthpiece which forms a seal against the outer surface of the person's lips.
REFERENCES:
patent: 2454105 (1948-11-01), Thompson
patent: 4709651 (1987-12-01), Lance
patent: 4821670 (1989-04-01), Foxcroft et al.
patent: 5086726 (1992-02-01), Sharp
Hathaway Todd N.
Will Thomas B.
Worth Willie Morris
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