Anti-shock transmission device for driving a generator by an oscillating weight in particular in a watch
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United States of America Patent
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Jul 1, 2003
Grant Date -
Jun 13, 2002
app pub date -
Nov 16, 2001
filing date -
Dec 7, 2000
priority date (Note) -
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Abstract
The transmission device disclosed is inserted between a rotating oscillating weight and an electric micro-generator in order to drive the generator rotor from the oscillating weight by multiplying the rotational speed. Its intermediate wheel and pinion includes a barrel (27) whose central shaft (24) is coupled to the drum (41) of the barrel by a spiral spring (30). The inner end of the spring has a bent portion (34) which engages via resilience in any one of a number of hollows (51) in the shaft and can be released by sliding over a slanting side (52) when the shaft exerts too great a torque in the given rotational direction. This arrangement prevents damage resulting from shocks, in particular in the case of a watch, without using a friction system.
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