Switchable 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) B66C 1/04 (2006.01) H01F 13/00 (2006.01)

Patent

CA 2458251

A switchable magnetic device with first and second permanent magnets (10, 11), mounted within a housing such that the magnets (10, 11) are rotatable relative to each other, between a "fully off" position in which the north and south poles of the magnets are in substantial alignment with the south and north poles respectively of the second magnet, the device thus presenting a relatively weak external magnetic field, and a "fully on" position in which the north and south poles of the first magnet are positioned substantially in alignment with the north and south poles respectively of the second magnet, the device presenting a relatively strong external magnetic field. Biasing means (30) are operatively associated with one or both of the magnets (10, 11) to bias the relative rotation of said magnets toward the fully on position, and wherein placing said device on or in close proximity to a ferromagnetic material causes magnets (10, 11) to rotate to a relative orientation such that the device presents a relatively strong external magnetic field.

La présente invention concerne un dispositif magnétique commutable avec un premier et un second aimant permanent (10, 11), ce dispositif étant monté dans un boîtier de sorte que les aimants (10, 11) puissent tourner l'un par rapport à l'autre entre une position complètement fermée dans laquelle les pôles nord et sud de ces aimants sont sensiblement alignés avec, respectivement, les pôles sud et nord du second aimant, ce dispositif présentant alors un champ magnétique externe relativement faible, et une position complètement ouverte dans laquelle les pôles nord et sud du premier aimant sont sensiblement alignés avec, respectivement, les pôles nord et sud du second aimant, ce dispositif présentant alors un champ magnétique externe relativement fort. Des organes (30) de polarisation sont associés de manière opérationnelle à un des aimants (10, 11) ou aux deux aimants, de façon à polariser la rotation relative de ces aimants vers la position complètement ouverte, et le placement de ce dispositif sur un matériau ferromagnétique ou à proximité de ce dernier entraîne la rotation des aimants (10, 11) vers une orientation relative de sorte que ce dispositif présente un champ magnétique externe relativement fort.

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