Whistle

Signals and indicators – Horns – whistles and compressional wave generators

Patent

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Details

116141, G01K 500

Patent

active

058161864

ABSTRACT:
A whistle is provided which will create two frequencies when blown to produce a beat. The whistle has a mouthpiece defining an inlet opening and an inlet passageway extending axially from the inlet opening to a main body which has two similar chambers extending generally axially. Air from the passageway engages two splitter edges associated one with each of the chambers. A lanyard receiver extends axially from the main body remote from the mouthpiece and defines a transverse cavity connected to one of the axial chambers. The whistle is made from first and second parts having mating peripheral surfaces where a joint is made. The arrangement of the whistle is such that two resonant frequencies are created each having a different audible frequency to create a beat. This is achieved in a simple, light and compact structure which is simple to assemble resulting in a relatively inexpensive whistle having good sound characteristics.

REFERENCES:
patent: 321202 (1885-06-01), Fisher
patent: 394243 (1888-12-01), Briggs
patent: 396821 (1889-01-01), Johnson
patent: 492887 (1893-03-01), Hall
patent: 632184 (1899-08-01), Johnson
patent: 1094006 (1914-04-01), O'Reilly
patent: 2056623 (1936-10-01), Scott
patent: 2113396 (1938-04-01), Butterfield
patent: 4280299 (1981-07-01), Oka
patent: 4359961 (1982-11-01), Seron
patent: 4821670 (1989-04-01), Foxcroft
patent: 5086726 (1992-02-01), Sharp
patent: 5329872 (1994-07-01), Wright

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