Switchable permanent magnetic device

H - Electricity – 01 – F

Patent

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Details

H01F 7/04 (2006.01) B23Q 3/15 (2006.01) B23Q 3/154 (2006.01) B65G 17/46 (2006.01) B66C 1/04 (2006.01) H01F 13/00 (2006.01)

Patent

CA 2392772

A switchable magnetic device includes a first magnet (10) and a second magnet (11), both of which are essentially cylindrical. Magnets (10, 11) are housed in a housing made from pole pieces (12,13). Pole pieces (12, 13) are ferromagnetic. Lower magnet (10) is fixedly mounted in the housing whilst upper magnet (11) can rotate within the housing. Upper magnet (11) is formed with notches or grooves (14, 15) along its vertical side walls. These notches or grooves (14, 15) receive downwardly depending arms (16, 17) of bar (18). Bar (18) is received inside a groove (19) formed on boss (20). Boss (20) is connected to a short bar (21) that, in turn, is fixedly connected to a handle or lever (22). By this means, rotation of handle or lever (22) causes rotation of second magnet (11). When the upper magnet (11) is positioned such that its north pole substantially overlies the south pole of lower magnet (10) and the south pole of upper magnet (11) substantially overlies the north pole of lower magnet (10), the first and second magnets act as an internal active magnetic shunt and as a result the external magnetic field strength from the device is quite low. Rotating the upper magnet (11) 180~ about its axis of rotation brings the magnets into alignment such that the respective north and south poles of the upper magnet (11) substantially overlie respective north and south poles of lower magnet (10). In this alignment, the external magnet field from the device is quite strong and the device can be affixed to surfaces or objects.

L'invention concerne un dispositif magnétique commutable comprenant un premier aimant (10) et un second aimant (11), tous deux adoptant une configuration pratiquement cylindrique. Les aimants (10,11) sont logés dans un boîtier formé d'éléments polaires (12,13) ferromagnétiques. L'aimant inférieur (10) est monté à demeure dans le boîtier alors que l'aimant supérieur (11), présentant des encoches ou entailles (14, 15) ménagées le long de ses parois latérales verticales, peut tourner dans le boîtier. Ces encoches ou entailles (14, 15) reçoivent des bras descendants (16, 17) partant d'une barre horizontale (18) qui est insérée dans une entaille (19) pratiquée sur une protubérance (20) reliée à un courte barre (21) qui est, à son tour, reliée fermement à un manche ou levier (22). De cette manière, la rotation du manche ou levier (22) entraîne la rotation du second aimant (11). Lorsque l'aimant supérieur (11) est placé de sorte que son pôle nord recouvre pratiquement le pôle sud de l'aimant inférieur (10) et que le pôle sud de l'aimant supérieur (11) recouvre pratiquement le pôle nord de l'aimant inférieur (10), les premier et second aimants servent de shunt magnétique interne actif, ce qui a pour effet de réduire l'intensité du champ magnétique externe du dispositif. La rotation de 180· de l'aimant supérieur (11) autour de son axe assure l'alignement des aimants de sorte que les pôles nord et sud de l'aimant supérieur (11) recouvrent pratiquement les pôles nord et sud correspondants de l'aimant inférieur (10). Dans cet alignement, le champ magnétique extérieur provenant du dispositif est relativement important et le dispositif peut, par conséquent, être fixé sur des surfaces ou des objets.

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