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Magnasphere Corporation

Randy Woods

An improved magnetic switch ( ) is provided which is designed for use in an alarm circuit ( ) in order to detect relative movement between first and second members such as a door ( ) and frame ( ), so as to signal unauthorized opening of the door ( ). The switch ( ) includes a switch assembly for mounting in frame ( ) and having first and second switch elements ( ), a permanently magnetized, shiftable body ( ) adjacent the elements ( ), and a first attractive component ( ). Additionally, the switch ( ) has a second attractive component ( ) for mounting to the door ( ), which is in the form of a ferromagnetic component such as a permanent magnet ( ) or steel plate ( ). In use when door ( ) is closed and circuit ( ) is armed, the magnetic attraction between body ( ) and component ( ) shifts the body ( ) to a switch-closed position in simultaneous contact with the switch elements ( ). If the door ( ) is opened, the magnetic attraction between body ( ) and component ( ) moves the body to a switch-open position out of simultaneous contact with the switch elements ( ), thus triggering circuit ( ). If an intruder attempts to defeat the switch ( ) through an external magnet ( ), this again moves the body ( ) to a switch-open position, triggering the circuit ( ).

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Prescott, AZ, United States of America

Randy Woods