Locking apparatus for preventing unauthorized access or actions
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United States of America Patent
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Apr 20, 1982
Issued Date -
N/A
app pub date -
Mar 28, 1980
filing date -
Nov 22, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for actuating a security system which includes an actuator element, such as a key, in which is embedded a plurality of 'Wiegand effect' magnetic rods forming at least one track of magnetically coded information. When the actuator element is inserted into a complementary element, a conditioning permanent magnet of a given polarity at the entrance of the complementary element switches each magnetic rod into a first magnetic state, then a drive permanent magnet of an opposite polarity disposed inwardly of the conditioning magnet switches each magnetic rod into a second magnetic state as the magnetic rod moves past it, causing a sharp voltage pulse to be generated within a sensor coil disposed close to the drive magnet and the magnetic rod being switched. The information carried by the actuator element is transmitted as a series of voltage pulses generated by one or more sensor coils to known signal processing circuits, which actuates the security system to permit an authorized action if this information is the same as information stored in a memory of the signal processing circuits.
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