Balance spring, regulated balance wheel assembly and methods of manufacture thereof
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United States of America Patent
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Dec 18, 2012
Grant Date -
May 7, 2009
app pub date -
May 4, 2006
filing date -
May 14, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A balance spring comprising a flat spiral coil and a non-elastic inner attachment part formed by laser beam cutting. The spring has an outer attachment plate in the plane of the coil formed with a channel which receives and protects the outer winding of the coil. The outer attachment plate has a curved attachment edge which allows the location of the oscillator dead point to be varied without affecting spring frequency.
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