Spring loaded driving member for timepiece movement
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United States of America Patent
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Feb 19, 2013
Grant Date -
Sep 30, 2010
app pub date -
Oct 8, 2008
filing date -
Nov 16, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A driving member for a timepiece movement comprises two superimposed coaxial barrels (1, 11) coupled in series, each barrel including a spring provided in a cylindrical housing rotatingly mounted on a common shaft (20). The respective housings (2, 12) of the barrels are positioned opposite each other and do not include a lid, and the springs (7, 17) are separated only by a separation washer (26) or a gap. This arrangement can be used for increasing the height (H) of the springs, and thereby the amount of energy and the power reserve of the watch for an identical global volume of the driving member, or for reducing the total height of the driving member. Such a driving member is particularly intended for watches with a high power reserve.
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