Security alarm switch

G - Physics – 08 – B

Patent

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Details

G08B 13/08 (2006.01) G08B 21/00 (2006.01) H01H 35/02 (2006.01) H01H 36/00 (2006.01)

Patent

CA 2183554

A magnetic switch assembly (10) is provided for detecting relative movement between first and second adjacent members (14, 18), and to defeat attempted magnetic manipulation of the assembly (10). The assembly (10) includes a pair of adjacent, superposed, upper and lower switch elements (22, 24) adapted for mounting on the first member (14) with the lower switch element (24) presenting a sloped surface (26). A shiftable, ferromagnetic ball (34) is disposed between the elements (22, 24) and movable along surface (26) between spaced upper and lower switch operating positions. A magnet (36) adapted for mounting on the second member (18) is also provided, and is oriented for normally retaining the ball (34) in the upper position thereof; however, upon movement of the member (18), the ball (34) is permitted to shift downwardly along the position thereof.

L'invention concerne un interrupteur magnétique (10), qui permet de détecter un mouvement relatif entre une première et une seconde structures adjacentes (14, 18) et d'empêcher toute tentative de manipulation magnétique de l'agencement (10). L'agencement (10) comporte une paire d'éléments d'interrupteur adjacents et superposés (22, 24), l'un supérieur et l'autre inférieur, conçus pour être montés sur la première structure (14). L'élément d'interrupteur inférieur (24) présente une surface inclinée (26). Une bille mobile ferromagnétique (34) est placée entre les éléments (22, 24) et peut se déplacer le long de la surface (26), entre des positions espacées supérieure et inférieure d'actionnement d'interrupteur. Un aimant (36), conçu pour être monté sur le second élément (18), est orienté de façon à retenir normalement la bille (34) dans la position supérieure. Toutefois, en cas d'un mouvement de la structure (18), la bille (34) peut glisser vers le bas vers sa position inférieure.

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