发明名称 |
SOUNDERS FOR FIRE ALARM SYSTEMS |
摘要 |
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.
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申请公布号 |
WO0069213(A2) |
申请公布日期 |
2000.11.16 |
申请号 |
WO2000ZA00091 |
申请日期 |
2000.05.05 |
申请人 |
GSBS DEVELOPMENT CORPORATION;RUNCIMAN, DUNSTAN, WALTER |
发明人 |
RUNCIMAN, DUNSTAN, WALTER |
分类号 |
H04R1/28;(IPC1-7):H04R1/34 |
主分类号 |
H04R1/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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