Anti-shock transmission device for driving a generator by an oscillating weight in particular in a watch

An anti-shock transmission device for driving the rotor of an electric generator via an oscillating weight in a portable apparatus, including:

• a central shaft and an intermediate toothed wheel, one of which is capable of being driven in rotation by movements of the oscillating weight and the other is coupled to the generator rotor by a kinematic connection, said central shaft and said intermediate wheel having a common axis of rotation,
• a spiral-shaped spring having an inner end coupled to said central shaft and an outer end coupled to said intermediate wheel,
• wherein said central shaft includes a series of hollows distributed over its periphery and wherein an inner end of said spring is arranged to engage in anyone of said hollows via the resilience of said spring and to be able to be released from said hollow when it is subjected to sufficient force in at least one of the device's rotational directions.