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US 7,397,341 B2Granted
System to detect lock tampering
AssigneeHoneywell International Inc.
InventorsRajeshwari Bhat, Dinesh Kumar K N, Francis C V Saju
Life of this patent
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Abstract
A lock and key system is configured to sense an operational signature generated by an object placed into a keyway in the system. The system is further configured to compare the operational signature with a reference signature, and to generate an alarm when the operational signature differs from the reference signature by a threshold.
Claims19
A method comprising:
- configuring a lock and key system to sense an operational signature generated by an object placed into a keyway of said lock and key system;
- configuring said system to compare said operational signature with a reference signature;
- and
- configuring said system to generate an alarm when said operational signature differs from said reference signature by a threshold;
- wherein said operational signature is one or more of a vibration signature and an acoustic signature.
2 more elements
A system comprising:
- a lock and key system;
- a lock and key tampering detection system coupled to said lock and key system;
- and
- a sensor mounted in proximity to said lock and key system, said sensor electronically coupled to an analog to digital converter through a signal conditioning unit;
- wherein said sensor is configured to sense an acoustic or vibration-based operational signature generated by an object placed into a keyway of said lock and key system.
2 more elements
A machine readable medium comprising instructions to execute a method comprising:
- sensing an operational signature in a lock and key system generated by an object placed into a keyway;
- comparing said operational signature with a reference signature;
- and
- generating an alarm when said operational signature differs from said reference signature by a threshold;
- wherein said operational signature is one or more of a vibration signature and an acoustic signature.
2 more elements
Dependencies are inferred from the claim text.