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US 7,248,136 B2Granted
Tamperproof magnetic switch assembly with universal switch
AssigneeHarco Laboratories, Inc.
InventorSamir W. Habboosh
Life of this patent
Estimating the term…
Abstract
A universal magnetic switching assembly for detecting relative movement between first and second members, the universal switching assembly including, a flux directing device for selectively directing a majority of applied magnetic flux, such that an externally applied magnetic field cannot be used to defeat the magnetic switch assembly. The magnetic switching assembly also including at least one tamper switch to detect application of an external magnetic field.
Claims19
A magnetic switching device for detecting relative movement between a first and a second member comprising:
- a first switch that switches between open and closed contact positions indicating when the first and second members are in proximity to each other;
- a second switch that has an electrically conductive shiftable body that shifts between simultaneous contact with two switch elements and no simultaneous contact with the two switch elements based upon applied magnetic fields generated by first and second magnetic components, the switch assembly further including:
- a flux concentrator positioned in proximity with the shiftable body;
- said flux concentrator providing a reduced reluctance path for an applied magnetic field such that the strength of the applied magnetic field is increased;
- said flux concentrator directing at least a portion of a magnetic field emanating therefrom toward said switch assembly;
- a bias ring positioned in proximity to said shiftable body member, the magnetic field emanating from the flux concentrator coupling to the bias ring.
3 more elements
A magnetic switching device for detecting relative movement between a first and a second member comprising:
- a first switch that switches between open and closed contact positions indicating when the first and second members are in proximity to each other;
- a second switch that has an electrically conductive shiftable body that shifts between simultaneous contact with two switch elements and no simultaneous contact with the two switch elements based upon applied magnetic fields;
- a flux director, positioned in proximity with said second switch, said flux director channeling at least a portion of an applied magnetic field toward said second switch;
- and
- a biasing member associated with said shiftable body to bias the shiftable member to one of said two positions based upon an applied magnetic field.
2 more elements
A magnetic switching device for detecting relative movement between a first and a second member comprising:
- a switch assembly that has an electrically conductive shiftable body that shifts between simultaneous contact with two switch elements and no simultaneous contact with the two switch elements based upon applied magnetic fields generated by first and second magnetic components;
- a tamper switch for indicating the application of an applied external magnetic field to the magnetic switching device, said tamper switch including:
- an electrically conductive shiftable body that shifts between two positions, the first position being simultaneous contact with two switch elements and the second position being no simultaneous contact with the two switch elements;
- and
- a biasing member associated with said shiftable body to bias the shiftable member to one of said two positions based upon an applied magnetic field;
- said first and second magnetic components being positioned such that when the first and second members are in proximity to each other, magnetic flux is directed to said shiftable body so that said shiftable body is moved to one of the first or second positions, and when the first and second members are moved out of proximity to each other, said shiftable body is moved to the other of the first or second positions.
3 more elements
A magnetic switching device for detecting relative movement between a first and a second member comprising:
- a switch assembly that has an electrically conductive shiftable body that shifts between simultaneous contact with two switch elements and no simultaneous contact with the two switch elements based upon applied magnetic fields generated by first and second magnetic components;
- a pry tamper switch for indicating whether the switch assembly is moved relative to the first member, said tamper switch including:
- an electrically conductive shiftable body that shifts between two positions, the first position being simultaneous contact with two switch elements and the second position being no simultaneous contact with the two switch elements;
- and
- a biasing member associated with said shiftable body to bias the shiftable member to one of said two positions based upon an applied magnetic field;
- said first and second magnetic components being positioned such that when the first and second members are in proximity to each other, magnetic flux is directed to said shiftable body so that said shiftable body is moved to one of the first or second positions, and when the first and second members are moved out of proximity to each other, said shiftable body is moved to the other of the first or second positions.
3 more elements
A magnetic switching device for detecting relative movement between a first and a second member and for sending a signal indicative of the relative movement to a control panel comprising:
- a movement switch that switches between open and closed contact positions indicating when the first and second members are in proximity to each other;
- a tamper switch including an electrically conductive shiftable body that shifts between simultaneous contact with two switch elements and no simultaneous contact with the two switch elements based upon applied magnetic fields generated by first and second magnetic components, the switch assembly further including:
- and
- a biasing member associated with said shiftable body to bias the shiftable member to one of said two positions based upon an applied magnetic field.
1 more element
Dependencies are inferred from the claim text.