Control member with a balance wheel and a planar spiral for a watch or clock movement
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United States of America Patent
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-
Mar 18, 2008
Grant Date -
Nov 23, 2006
app pub date -
Apr 21, 2004
filing date -
Apr 29, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A regulating device including a balance (1) and a plane hairspring (2) for a time piece movement, the plane hairspring (2) including a stiffened portion (8) in its outer turn (7) that is arranged to cause the deformations of the turns to be substantially concentric. The spacing (d) between a terminal portion of the outer turn (7) and the last-but-one turn (9) of the hairspring (2) is large enough for said last-but-one turn (9) to remain free radially during expansions of the hairspring (2) up to amplitudes corresponding substantially to the maximum angle of rotation of the balance (1) in the movement.
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