Mainspring comprising supplementary energy accumulation curves
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United States of America Patent
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Feb 10, 2015
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N/A
app pub date -
Apr 3, 2012
filing date -
May 3, 2011
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Abstract
A barrel including a box for receiving a pivot arbour and at least one spring, wherein the at least one spiral spring is mounted between an internal wall of the box and an external wall of the pivot arbour , and can be wound to supply mechanical energy. The barrel further includes a device for increasing torque of the at least one spring including supplementary energy accumulation curves made on the spring so that the barrel torque is customized according to a winding tension of the at least one spring. The barrel can be a timepiece barrel.
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