Sounders for fire alarm systems
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 14, 2005
Grant Date -
N/A
app pub date -
May 5, 2000
filing date -
May 7, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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