Annunciator apparatus for monitoring electrical connections
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United States of America Patent
Stats
-
Jul 18, 1995
Issued Date -
N/A
app pub date -
Jan 21, 1993
filing date -
Jul 5, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An annunciator for indicating the removal of an electrical plug from the electrical receptacle. The electrical receptacle includes neutral switching contacts actuated in response to the insertion of a plug into the receptacle. An input circuit in the annunciator apparatus monitors the state of the neutral switching contacts and couples signals produced when a plug is removed to a latching circuit thereby to produce an audible or electrical indication of plug removal. The input Circuit and latching circuit are electrically isolated, and the annunciator detects any attempts to disconnect the apparatus from an external power supply or to remove any internal battery.
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