Apparatus for detect missing battery in smoke detector

Details Apparatus for detect missing battery in smoke detector Apparatus for detect missing battery in smoke detector

1989-03-09

1990-09-25

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specified housing

340628, G08B 2300

Patent

active

049596403

ABSTRACT:
A battery-powered smoke detector in which the battery is inserted in a removable door that is then inserted into the detector to power the detector is rendered incapable of insertion into the smoke detector unless a battery is in place in the removable door. A spring-loaded door stop is moved by the spring into a position where it prevents the door from being inserted into the smoke detector. A pin in the female terminal of the door that engages the male terminal of the battery is forced away from the door stop by a spring. When the door stop is depressed manually and a battery is inserted into the terminals, the pin is forced by the male terminal of the battery into a latching position in the door stop, holding it in a position where it will not interfere with insertion of the door. The absence of a door provides warning to an observer that the battery-powered smoke detector is not operable for lack of a battery.

REFERENCES:
patent: 4228428 (1980-10-01), Niedermeyer
patent: 4870395 (1989-09-01), Belano
patent: 4881063 (1989-11-01), Fawcett

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