Driving member for a timepiece movement
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United States of America Patent
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Apr 30, 2013
Grant Date -
Sep 15, 2011
app pub date -
Sep 25, 2009
filing date -
Nov 28, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A driving member for a timepiece movement includes a shaft, and a drum and a rotating member both mounted on the shaft. The drum and the rotating member are able to rotate with respect to each other and include teeth on their periphery. First and second superposed spiral springs have outer ends fixed to the drum and to the rotating member respectively and inner ends connected to each other to connect the springs in series. The drum and the rotating member fit together at least in the area of the peripheral wall of the drum so as to together form a closed housing containing the springs.
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