Tamper resistant magnetic contact apparatus for security...

Details Tamper resistant magnetic contact apparatus for security... Tamper resistant magnetic contact apparatus for security...

2005-11-08

2005-11-08

La, Anh V. (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S541000, C340S551000, C335S206000

Reexamination Certificate

active

06963281

ABSTRACT:
A tamper resistant magnetic contact switch apparatus for alarm systems that has a plurality of magnetic reed switches configured in a logic circuit and a magnetic pack for actuation. A magnetic shield disposed around the switches defines an actuation zone. In combination with the magnetic shield preventing magnetic fields from reaching the switches from locations outside the actuation zone, the magnet pack activates two of the five switches when positioned within the actuation zone to complete the logic circuit. The magnet pack does not, however, activate any of the other switches. If any of the other three switches are activated, or if either of the two activated switches are deactivated, the logic circuit is broken and the alarm circuit is activated.

REFERENCES:
patent: 4210889 (1980-07-01), Holce
patent: 4945340 (1990-07-01), Brill
patent: 5233323 (1993-08-01), Burkett et al.
patent: 5633626 (1997-05-01), Cawthorne
patent: 5668533 (1997-09-01), Jackson, Jr. et al.
patent: 6400267 (2002-06-01), Gordon-Levitt et al.
Invitation to pay additional fees with Annex (Partial International Search); PCT/US02/29096; mailed Jan. 24, 2003.

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