Eta Sa Manufacture Horlogere Suisse

Matthaus Friedli

Roman Egli

Florent Strahm

A timepiece power source is provided, including a barrel containing a mainspring mounted between a drum and an arbor rotating integrally with a ratchet wheel, including a differential gear coaxial to the barrel, with a first input driven by the ratchet wheel, a second input which is the drum, and a pivoting output wheel, coaxial to the arbor, arranged to form or to drive a power reserve indicator, the differential gear including balls driving the output wheel, cooperating with an upper surface of the drum, and with a lower surface, which is opposite thereto, of a differential plate forming the first input, pivoting coaxially on the arbor and connected to the ratchet wheel by a friction means cooperating with a plate, and the ratchet wheel forms the cover of the barrel.

Power reserve indicator for timepieces

Elementary timepiece mechanism comprising a first housing about an axis, a second housing, and a mobile element comprising a first shoulder pivoting in the first housing and a second shoulder pivoting in the second housing, the second housing comprising at least a first abutment surface arranged to ensure the alignment of the mobile element on said axis when the mobile element is in abutment on the first abutment surface, and the elementary mechanism includes at least one elastic return means arranged to return the mobile element to this first abutment surface.

Flexible bearing for pivoting a mobile timepiece element

Timepiece wheel set () including an arbor () carrying a wheel (), and a heart cam () in an angularly indexed position with respect to the wheel (), the heart cam () is freely mounted in a radial direction (R) with respect to the axis (D) of the arbor (), and is returned in a neutral position towards the axis (D) by at least one flexible element (), which is either a strip () incorporated in the heart cam (), or a spring () inserted between the wheel () and the heart cam (), and the flexible element () is dimensioned to damp impacts applied to a peripheral cam track () comprised in the heart cam ().

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Solothurn, Switzerland

Matthaus Friedli