Thermally compensating balance wheel
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United States of America Patent
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Jan 24, 2012
Grant Date -
Feb 11, 2010
app pub date -
Sep 6, 2007
filing date -
Sep 8, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A balance wheel having a thermally adjustable moment of inertia is described. In one aspect, the balance wheel includes radially movable compensation portions formed of shape memory material exhibiting a two-way memory effect. The radius of gyration of the balance wheel is therefore adjustable with temperature to compensate for thermoelastic effects in a balance spring attached to the balance wheel. In another aspect, a thermally stable balance wheel includes dynamically adjusting appendages whose expansion or contraction with temperature relative to the balance wheel cause change in its moment of inertia. The invention can compensate for both ‘normal’ and ‘abnormal’ thermoelastic spring behavior.
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