Eta Sa Manufacture Horlogere Suisse

Eta Sa Fabriques D'ebauches

Pierre Haefeli

Alphonse Bron

Jean-Luc Beguin

The coupling wheel () is brought into friction with an intermediate second wheel (), or, conversely, to moved away therefrom by a fork () formed in the large arm () of an L-shaped coupling spring (), articulated at the joining portion of the two arms () on an adjustment plate (), the small arm () of said coupling spring () having its end stressed by the end of a control lever (). Means for guiding () and positioning by a cam screw () allow the distance between the small arm () of the coupling spring () and the end of the control lever () to be modified, which thus allows manufacturing tolerances to be compensated for.

Chronograph coupling mechanism

A coupling device (1) between a source of mechanical energy (2) and a generator of electrical energy (3) comprises an arbor (4) driven by said source of mechanical energy, a cylindrical element (5) fixedly and coaxially mounted on the arbor, a tube (6) surmounting said cylindrical element arranged to rotate freely about said arbor and drive said generator. A helical spring (7) is friction-fitted on the cylindrical element and on the tube by its first turns (8) and last turns (9) respectively. A space (10) is provided between said tube and cylindrical element and the central turns (11) of the spring (7).

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Saules, Switzerland

Pierre Haefeli