Sounders for fire alarm systems

Details Sounders for fire alarm systems Sounders for fire alarm systems

2005-06-14

2005-06-14

Lockett, Kimberly (Department: 2837)

Acoustics

Sound-modifying means

Intensifying horn

C181S187000

Reexamination Certificate

active

06905001

ABSTRACT:
A sounder is disclosed which has walling (36, 38) defining a first air column (26) leading to a first sound aperture (34) through which the first column opens to atmosphere, and walling (40, 44) defining a second air column (60) leading to a second aperture (64) through which the second column opens to atmosphere. A diaphragm (16) is between the air columns and means are provided for causing said diaphragm to vibrate.

REFERENCES:
patent: 1943499 (1934-01-01), Williams
patent: 2310243 (1943-02-01), Klipsch
patent: 3142353 (1964-07-01), Todisco
patent: 3772466 (1973-11-01), Hossbach
patent: 4893343 (1990-01-01), Bader

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