Magnetic device for pivoting an arbor in a timepiece movement
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United States of America Patent
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Jun 27, 2017
Grant Date -
Dec 22, 2016
app pub date -
Jun 8, 2016
filing date -
Jun 16, 2015
priority date (Note) -
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Abstract
The device for pivoting an arbor about a determined axis includes at least one magnetic bearing including a magnet which exerts a force of attraction on a pivot, made of magnetic material, of the arbor. Further, the bearing includes a magnetic flux centring structure arranged between the magnet and the pivot, and a support for the centring structure. This centring structure includes a peripheral portion and a central portion resiliently connected to the peripheral portion by at least one connecting element, the central portion being formed of a highly magnetically permeable material and having smaller dimensions than those of the magnet. The peripheral portion is rigidly force fitted to the support so that the central portion is centred on the pivot axis.
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