One-piece hairspring and method of manufacturing the same
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United States of America Patent
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Jan 7, 2014
Grant Date -
Dec 20, 2012
app pub date -
Aug 31, 2012
filing date -
Mar 28, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a one-piece hairspring (21, 21′) including, a balance spring (25, 25′) coaxially mounted on a collet (27, 27′), made in the same layer of silicon-based material. According to the invention, the hairspring includes an elevation device (2, 2′) for the outer coil of the balance spring above the layer of silicon-based material so as to improve the concentric development of the hairspring. The invention also relates to a timepiece including a hairspring of this type and the method of manufacturing the same. The invention concerns the field of timepiece movements.
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