Balance wheel, balance spring and other components and assemblies for a mechanical oscillator system and methods of manufacture
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United States of America Patent
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Jun 1, 2010
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N/A
app pub date -
Sep 17, 2004
filing date -
Oct 20, 2003
priority date (Note) -
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Abstract
The application discloses a method of making a balance spring (100) from continuous fibers or ceramic by winding them around a cylindrical former (90), interspaced with a releasing agent (110). Also disclosed is a method of making a balance spring, preferably of a ceramic material (60), by applying it to a rotating former (70) mandrel or plate and subsequently heat treating. Balance wheels (30) having a moment of inertia which decreases with a rise in temperature due to a special arrangement of components (8, 9, 10) having different coefficients of thermal expansion are also disclosed. A mechanical oscillator system comprising a non-magnetic ceramic or continuous fiber balance spring (50) and a non-magnetic balance wheel (30) formed of a material having a coefficient of thermal expansion of less than 6.times.10.sup.-6K.sup.-1 and having a plurality of non-magnetic poising or timing appendages (5) is also disclosed.
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