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Tamper resistant magnetic contact apparatus for security systems

  • US 6,963,281 B2
  • Filed: 11/01/2001
  • Issued: 11/08/2005
  • Est. Priority Date: 09/14/2001
  • Status: Active Grant
First Claim
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1. A magnetic contact apparatus for use with an alarm system, comprising:

  • a sensor unit;

    at least five magnetically actuated switches; and

    a magnetic shield around said switches configured to define an actuation zone;

    wherein at least two of said magnetic switches are configured to be actuated to complete a logic circuit when a magnetic actuator is positioned within said actuation zone;

    wherein said logic circuit is configured to be broken if either of said at least two switches is deactivated or if any of said other switches are activated.

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