Oscillator for a clock movement
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United States of America Patent
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Aug 22, 2017
Grant Date -
Sep 4, 2014
app pub date -
Oct 23, 2012
filing date -
Oct 24, 2011
priority date (Note) -
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Abstract
An oscillator (10) includes a spiral spring (11) made from a paramagnetic or diamagnetic material and an assembled balance wheel (12) having a shaft (13) on which the following elements are fitted: a balance wheel (14), a plate (15) and a collet (16) rigidly connected with the spiral spring (11). The maximum diameter (Dmax) of the shaft is less than 3.5, or even 2.5, or even 2 times the minimum diameter (D1) of the shaft on which one of the elements is fitted, or the maximum diameter (Dmax) of the shaft is less than 1.6, or even 1.3 times the maximum diameter (D2) of the shaft on which one of the elements is fitted.
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