A.C. alarm buzzer
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United States of America Patent
Stats
-
Oct 13, 1987
Grant Date -
N/A
app pub date -
Jun 18, 1985
filing date -
Jun 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An alarm buzzer includes a bobbin mounted within a housing and having a base portion and a hollow cylindrical portion. The mounting plate is interposed between the bottom wall and the base portion. A coil is wound around the cylindrical portion, and opposite ends of the coil are connected respectively to a pair of terminals mounted on the base portion. An iron core extends through the cylindrical portion of the bobbin and is held in engagement with the bobbin and the bottom wall, thereby holding the bobbin and the mounting plate against movement with respect to the housing. An armature is resiliently supported on the mounting plate for being attracted into the core upon energization of the electromagnet. Upon de-energization of the electromagnet, the armature is returned into striking contact with a vibratory plate to produce a sound under the restoring force of the resilient means.
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