Communications: electrical – Condition responsive indicating system – Specified housing
Patent
1989-01-30
1989-11-14
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specified housing
116303, 340568, 340628, 340691, G08B 2100
Patent
active
048810630
ABSTRACT:
The present invention relates to a battery removal indicator for battery operated units such as smoke detectors or fire alarms. The battery removal indicator is formed by a spring loaded member which is retained in a retracted position when a battery is present and which moves to a deployed position when the battery is absent. In its deployed position, the member prevents a cover of the unit from being engaged by a latch mechanism for securing the cover in a closed position. The unlatched cover acts as a first visual indication that the battery is not present. The member is also marked with warning indicia on one or more surfaces so as to provide a second visual indication that the battery is absent.
REFERENCES:
patent: 4228428 (1980-10-01), Niedermeyer
General Electric Home Sentry Smoke Alarm-Pub. No. #000861, 1976.
EI Company, Ltd.
Swann III Glen R.
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