Communications: electrical – Condition responsive indicating system – Specified housing
Patent
1989-06-12
1991-10-08
Swann III, Glen R.
Communications: electrical
Condition responsive indicating system
Specified housing
116315, 429 96, G08B 2300, H01M 210
Patent
active
050558307
ABSTRACT:
A smoke detector with a visual battery missing indicator and a removable cover includes first and second locking prongs molded in the detector and directed toward the cover. A battery is positionable between the first and second locking prongs deflecting same from a non-locking position to a locking position. In the locking position, free ends of the prongs can engage the cover, locking same to the detector. In the non-locking position, the prongs are not effective to engage the cover. If the detector is mounted on a ceiling, the non-engaged cover will not remain closed. In an alternate embodiment usable with a bracket mounted detector, a depressible blocking member is located adjacent a region where the detector is normally coupled to a portion of the bracket. In the presence of a battery this member is retracted, enabling the unit to be attached to the bracket. In the absence of a battery, this member is extended and the detector cannot be attached to the bracket.
REFERENCES:
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patent: 3887393 (1975-06-01), La Rue, Jr.
patent: 4228428 (1980-10-01), Niedermeyer
patent: 4471346 (1984-09-01), Nelson et al.
patent: 4525703 (1985-06-01), Bellino
patent: 4870395 (1989-09-01), Belano
patent: 4881063 (1989-11-01), Fawcett
patent: 4959640 (1990-09-01), Hall
Cousins Otto J.
Paulick Thomas E.
Sisselman Ronald
Woodburn James H.
Mullen Jr. Thomas J.
Pittway Corporation
Swann III Glen R.
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