Non-intrusive dial rotation detection of high security locks
AssigneeSargent & Greenleaf, Inc.
InventorsGeorge Marshall Horne, Michael Robert Clark
Life of this patent
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Abstract
A rotation detection system for detecting the rotation of a lock dial includes a magnet coupled to the lock dial to generate a changing magnetic field in response to rotation of the lock dial, a sensor disposed near enough to the magnet to detect the magnetic field and provide a sensor output signal indicative of the magnetic field, and a controller coupled to the sensor for receiving the sensor output signal, the controller providing a controller output signal in response to a change in the sensor output signal. An alarm interface can receive the controller output signal and provide an alarm signal.
Claims15
A rotation detection system for detecting the rotation of a lock dial, the system comprising:
- a magnet coupled to the lock dial and adapted to generate a changing magnetic field in response to rotation of the lock dial;
- a mountable detector for detecting the magnetic field generated by the magnet and providing an output signal to a monitoring system in response to a change in the detected magnetic field.
A rotation detection system for detecting the rotation of a lock dial, the system comprising:
- a rotating lock dial coupled to a lock body by a spindle;
- a magnet for providing a magnetic field, the magnet being disposed in the lock body and coupled to the lock dial for rotation therewith, the magnetic field changing as the magnet moves in response to the rotation of the lock dial;
- a sensor disposed near enough to the magnet to detect the magnetic field and provide a sensor output signal indicative of the magnetic field, the sensor output signal indicative of the magnetic field changing as the magnetic field changes;
- a controller coupled to the sensor for receiving the sensor output signal indicative of the magnetic field, the controller providing a controller output signal in response to a change in the sensor output signal indicative of the magnetic field;
- and
- an alarm interface coupled to the controller for receiving the controller output signal.
A method of detecting the rotation of a lock dial comprising the steps of:
- establishing a baseline magnetic field;
- providing a magnet coupled to a lock dial, the magnet providing a changing magnetic field in response to rotation of the lock dial;
- monitoring the magnetic field;
- and
- providing a magnetic rotation detector for detecting the magnetic field generated by the magnet and providing an output signal in response to a change in the detected magnetic field.
Dependencies are inferred from the claim text.