Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-04-02
1980-10-14
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
73431, 116200, 248318, 248544, 292 17, 340371, 340373, 340376, 340693, G08B 1710, G08B 0000
Patent
active
042284287
ABSTRACT:
The cover of a ceiling mounted smoke detector is hung at one side by a chain from the detector frame. At the other side the cover has a clip which engages the smoke detector battery. Thus if the battery is not in place the cover hangs down from the chain providing a signal indicative of the absence of the battery. A flag is provided which is pivotally mounted inside the cover and movable on the pivot through an opening in the bottom of the cover. A magnet attached to the flag magnetically engages the diaphragm of the horn alarm in the smoke detector and maintains the flag at a raised position within the cover. When the horn alarm is sounded, the vibration of the diaphragm causes disengagement of the magnet whereupon the flag pivots downwardly to a position at which it extends below the cover. This provides a visual indication that the horn alarm has been sounded.
REFERENCES:
patent: 1909124 (1933-05-01), Rogers
patent: 3168988 (1965-02-01), Kula
patent: 3785334 (1974-01-01), Waldeck
patent: 3959787 (1976-05-01), Messmann et al.
patent: 4022148 (1977-05-01), Chapman
patent: 4040381 (1977-08-01), Keogh, Sr. et al.
Caldwell Sr. John W.
Myer Daniel
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