Elevator button improved to function as a lock
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United States of America Patent
Stats
-
Jan 4, 1994
Grant Date -
N/A
app pub date -
Dec 10, 1991
filing date -
Dec 10, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention prioritizes elevator service by an electronic lock and key circuit which uses a pre-existing capacitive touch button, an electronic key for receiving a 10 KHz first button pulse train from the face of the capacitive touch button and modulating said capacitive touch button pulse train with a signal of a preset frequency. A modulated first pulse train is provided back to the capacitive touch button face and an electronic lock for modulating a demodulated first pulse train received at the capacitive touch button face so as to provide a high priority hall call or a car call.
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