MAGNETIC ASSEMBLY FOR MAGNETICALLY ACTUATED CONTROL DEVICES

摘要

A magnetically actuated apparatus, which enlarges, extends and makes continuous magnetic fields used by magnetically controlled devices, such as a magnetic reed switch for use in physical security monitoring systems is show n. Apparatus includes a sensor (88) and a magnetic actuator (90, 92) for use wi th a movable closure member. The sensor is mounted into to a fixed support memb er (148) that is arranged for displacement relative to a second movable support member (146). The sensor has a pair of contacts that are connectable to an electronic circuit. The contacts form a switch that is actuated by the magnetic actuator. The magnetic actuator comprises a unique elongated magnet with specific polarity or a plurality of aligned, alike permanent magnets th at are mountable to the second support member. The aligned magnets (90, 92) hav e like magnetic fields that align one another and combine to form an effective magnetic actuation field that has a given magnitude and a given direction th at is greater that the magnitude and direction than any one of the magnets. The elongated magnet has a specific pole for a given distance as its controlling means. The effective magnetic actuation field increases the distance in whic h the movable support member is displaceable relative to the fixed support member without changing the electric condition of the sensor. The present invention creates a magnetic apparatus, having a wider and controllable gap and break point distance not found in the present art.