Tamper resistant magnetic contact apparatus for security systems
First Claim
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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0 Petitions
Accused Products
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.
41 Citations
49 Claims
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1. A magnetic contact apparatus for use with an alarm system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A magnetic contact apparatus for use with an alarm system, comprising:
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a logic circuit configured to indicate an alarm condition if a magnetic actuator is moved outside an actuation zone or if a magnetic field from a source other than said magnetic actuator is brought into said actuation zone after said magnetic actuator is brought into said actuation zone;
wherein said logic circuit comprises;
at least five magnetically actuated switches; and
a magnetic shield around said switches configured to define said actuation zone;
wherein at least two of said magnetic switches are configured to be actuated and complete said logic circuit when said magnetic actuator is positioned within said actuation zone; and
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. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A magnetic contact apparatus for use with an alarm system, comprising:
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a logic circuit;
said logic circuit comprising at least five magnetically actuated switches;
a shield around said switches configured to prevent magnetic fields from outside an activation zone from reaching said switches;
at least two of said magnetic switches configured to be actuated and complete said logic circuit when a magnetic field is within said activation zone;
said logic circuit further configured to be broken if either of said at least two switches is deactivated or if any of said other switches are activated;
wherein breaking of said logic circuit is indicative of an alarm condition. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A magnetic contact apparatus for use with an alarm system, comprising:
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a sensor unit;
said sensor unit comprising a common conductor, an alarm conductor, and a guard conductor and at least five switches;
wherein each of said switches has an activated state and a deactivated state;
wherein at least two of said switches are adapted to be placed in an activated state in response to a magnetic field of predetermined flux density; and
wherein an alarm condition is indicated if any one of said at least two switches is deactivated or if any of said other switches is activated after said at least two switches are activated. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A tamper resistant magnetic contact apparatus for use with an alarm system, comprising:
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a sensor unit;
said sensor unit having at least five electrically interconnected magnetically actuated reed switches in a logic circuit;
said logic circuit configured to activate an alarm; and
an actuator unit providing one or more magnetic fields sufficient to activate a plurality of said reed switches when brought into proximity of said sensor unit;
wherein the deactivation of an active switch or the activation of an inactive switch in said sensor unit is indicative of an alarm condition. - View Dependent Claims (34, 35, 36, 37, 38)
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39. A tamper resistant magnetic alarm contact apparatus, comprising:
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a sensor unit having a tamper circuit and a logic circuit including electrically interconnected magnetically actuated reed switches;
said tamper circuit and said logic circuit configured to activate an alarm;
an actuator unit providing one or more magnetic fields sufficient to activate a plurality of said reed switches in said logic circuit when brought into proximity of said sensor unit;
wherein the deactivation of an active switch or the activation of an inactive switch in said sensor unit will trigger an alarm; and
a tamper plate having a magnet associated with said sensor unit and said tamper circuit;
said sensor unit having a tamper switch associated with said magnet and said plate;
said sensor unit having a tamper circuit electrically coupled with said tamper switch;
wherein the tamper switch and tamper circuit are configured to trigger an alarm when said magnetic field associated with said tamper switch is altered. - View Dependent Claims (40)
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41. A tamper resistant magnetic contact apparatus for use with an alarm system, comprising:
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a sensor unit;
said sensor unit having at least five electrically interconnected magnetically actuated reed switches in a logic circuit;
said logic circuit configured to activate an alarm;
an actuator unit providing one or more magnetic fields sufficient to activate a plurality of said reed switches when brought into proximity of said sensor unit;
a tamper plate having a magnet, a core section and an outer section;
said core section configured to be mounted to a surface;
said outer section coupled with said sensor unit;
said outer section severable from said core section;
enda magnetic field shield disposed between the core section of the tamper plate and the mounting surface;
a tamper switch associated with said magnet and said plate, wherein said tamper switch is exposed to a magnetic field of predetermined flux density from said magnet; and
a tamper circuit electrically coupled to said switch, wherein the tamper switch and tamper circuit are configured to trigger an alarm when said magnetic field associated with said tamper switch is altered. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49)
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Specification