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Title:
SOUNDERS FOR FIRE ALARM SYSTEMS
Document Type and Number:
WIPO Patent Application WO2000069213
Kind Code:
A3
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 sound 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.

Inventors:
RUNCIMAN DUNSTAN WALTER (ZA)
Application Number:
PCT/ZA2000/000091
Publication Date:
July 26, 2001
Filing Date:
May 05, 2000
Export Citation:
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Assignee:
GSBS DEV CORP (US)
RUNCIMAN DUNSTAN WALTER (ZA)
International Classes:
H04R1/28; (IPC1-7): H04R1/34
Foreign References:
US1943499A1934-01-16
US2310243A1943-02-09
US3142353A1964-07-28
DE4100708A11992-07-16
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