Structure of magnet type sounder of an electronic acoustic alarm

Communications: electrical – Audible indication

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Details

3403847, 340 692, 3403911, 381192, G08B 300

Patent

active

056063040

ABSTRACT:
An improved structure of magnet type sounder of an electronic acoustic alarm mounted on the engine of a car, wherein primarily, a sound emitting circuit board is placed on an acoustic pipe of a supporting plate, and a magnet is held in a housing formed by an encircling plate beneath the supporting plate, and a sound transmitting case is formed as a flare on the bottom portion thereof which is convex in the inward direction to form a spherical dome surface of which an acoustic pipe column is telescopically placed over the acoustic pipe of the supporting plate, this assembly is then placed in a main case body, and further an acoustic resonant lid covers a through hole of the acoustic pipe column of the sound transmitting case, so that an object of volume reducing can be achieved,

REFERENCES:
patent: 4183017 (1980-01-01), Sims
patent: 4443667 (1984-04-01), Hunt
patent: 4973941 (1990-11-01), Davis et al.
patent: 5287084 (1994-02-01), Sone
patent: 5528697 (1996-06-01), Saito

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