发明授权
- 专利标题： Circuit for an emergency lighting and fire detector system
- 专利标题（中）： 应急照明和火灾探测系统电路
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申请号： US853468申请日： 1977-11-21
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公开(公告)号： US4199754A公开(公告)日： 1980-04-22
- 发明人: Robert W. Johnson , William J. Raddi
- 申请人： Robert W. Johnson , William J. Raddi
- 申请人地址： DE Wilmington
- 专利权人： ESB Incorporated
- 当前专利权人： ESB Incorporated
- 当前专利权人地址： DE Wilmington
- 主分类号： G08B29/18
- IPC分类号： G08B29/18 ; H02J9/02 ; G08B17/00 ; G08B7/00
摘要：
A circuit for a home safety unit having an emergency light system for providing light in the event of a power failure or when a fire is detected, and a fire detection system for providing an audible alarm indicating the existence of a fire. The circuit includes a battery which is constantly being charged and a low voltage responsive system for indicating a low voltage condition on the battery. A latching system causes the emergency light to be turned off when this low voltage condition is reached, and to remain off until the battery is recharged.
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