Battery sensing mechanism

Communications: electrical – Condition responsive indicating system – Specified housing

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Details

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:
patent: 3823367 (1974-07-01), Kaye et al.
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

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