Timepiece movement having a barrel with reduced core diameter
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United States of America Patent
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Nov 24, 2015
Grant Date -
Dec 25, 2014
app pub date -
Sep 13, 2012
filing date -
Sep 15, 2011
priority date (Note) -
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Abstract
A timepiece movement includes a plate and a bridge carrying a barrel, which includes a barrel mainspring between a drum and a receiving surface of a steel or stainless steel core and a cover fixed to the drum. The spring is made of a multiphase, cobalt-nickel-chromium based alloy, having a Young's modulus of between 200 and 240 GPa and a shear modulus of between 80 and 100 GPa, and having a width to thickness ratio of between 3 and 23, and a maximum radius of the steel or stainless steel core relative to a pivot axis is less than nine times a maximum thickness of the spring. The movement includes a shake limiting mechanism including a shim-washer independent of the core and guided by a shoulder of the core.
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