Electronic combination lock with magnetic anti-attack interlock
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United States of America Patent
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-
Dec 21, 1993
Grant Date -
N/A
app pub date -
Mar 16, 1992
filing date -
Mar 16, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To prevent the opening of an electronic combination lock by using a strong magnet to operate a stepper motor, a magnetic interlock is included in the lock structure. A magnetic pin is held in a retracted position by a small magnet when a strong attack magnet is positioned to attempt to open the lock, the magnetic pin is attracted from the holding magnet and extended to bridge the bolt and lock housing, blocking the retraction of the bolt.
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