Acoustic alarm device with sound attenuator

Details Acoustic alarm device with sound attenuator Acoustic alarm device with sound attenuator

1975-05-29

1977-01-04

Queisser, Richard C.

Signals and indicators

Horns, whistles and compressional wave generators

340391, G10K 922, G10K 1062

Patent

active

040007154

ABSTRACT:
An electromagnetic acoustic alarm device including a casing formed in part by a bell-shaped wall which defines together with a membrane secured to the casing by means of the bell-shaped wall a chamber, the front portion of the wall provided with at least one opening and a rotatable external plate of the same configuration as the wall front portion having at least one opening for registration to a selected extent with the wall opening so as to adjustably attenuate the high frequency sound component of the device.

REFERENCES:
patent: 758363 (1904-04-01), Hutchison
patent: 2153500 (1939-04-01), Eaves
patent: 3041601 (1962-06-01), Wetzel
patent: 3094972 (1963-06-01), Leavenworth
patent: 3432849 (1969-03-01), Earling
patent: 3866203 (1975-02-01), Berns

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