Werthanor S.a.

Ks 22 Sa

Roger Ecoffet

Alfred Vollert

Joseph Eray

Sylvain Wenger

Method for fixing a crown screwed on a watch case and watch case equipped with same

The invention concerns a method for welding hinge pins onto links each formed of one or more elements, the links being connected to each other by means of said hinge pins arranged in passages provided for this purpose in the links, each pin being fixed onto one of the links and hinged onto the next link, characterised in that the connection of the pin to the link is made via an arc welding operation with the aid of an electrode in an inert atmosphere without using a solder.

Method for welding hinge pins onto elements intended to form hinged

An annular packing (30) has a cross-section in the form of a dumbbell including two enlargements (31, 32) connected by a neck (33). In a preferred embodiment the enlargements exhibit a polygonal cross-section. The packing advantageously replaces an O-ring seal in which the interior diameter of the ring is large relative to the diameter of the cross-section of the ring. The packing is arranged between two parts driven at different speeds, in precision mechanisms or in horology.

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Villers-le-Lac, France

Roger Ecoffet