Patent ID: 8228191

Claim:
An anti-tamper alarm assembly configured to detect relative movement between first and second members each presenting surfaces, comprising: an alarm section secured to the surface of said first member by a fastener extending through the first member surface, said alarm section including a sensor configured to detect said relative movement between said first and second members, an antitamper magnetic component in an anti-tamper position proximal to said fastener, and a magnetically actuatable anti-tamper switch operably coupled with said anti-tamper magnet, said anti-tamper magnetic component causing the anti-tamper switch to assume a first switch condition when the anti-tamper magnetic component is in said anti-tamper position, said anti-tamper switch configured to assume a second switch condition when said anti-tamper magnetic component is moved from said anti-tamper position to a tamper position permitting access to said fastener for removal thereof, said sensor comprising a proximity switch including a switch assembly having a first elongated switch element, a second switch element disposed in spaced relationship to the first switch element, and a body moveable between first and second switch conditions, one of said switch conditions being when the moveable body is in simultaneous contact with both switch elements, and the other of said switch conditions being when said moveable body is out of simultaneous contact with the switch elements; and an alarm circuit coupled with said anti-tamper switch and configured to generate an alarm signal in response to said movement of said anti-tamper magnetic component to said tamper position.