Eta Sa Fabriques D'ebauches

Theodor Schoenenberger

Marco Bettelini

Ernst Moser

The invention concerns the structure of a timepiece movement, more particularly the structure of the hour wheel ( ), the inside of whose pipe ( ) includes an annular bulge ( ) co-operating with an annular groove ( ) arranged on the outer wall of the pipe ( ) of the cannon-pinion ( ). Thus, the hour wheel is snap-fitted onto the movement, without it being necessary to provide an additional part for this purpose, and its toothed wheel ( ) cannot therefore be released from the motion-work pinion ( ) during transport of the movement.

Timepiece movement

In order to manufacture the display element intended for a timepiece, a sheet of plastic material shaped in a tape ( ) is provided. The sheet is then deformed using tools ( ) by thermoforming to give it a profile ( B) corresponding to the outer contour ( ) of said elements. Such an element can be a date disc or a dial.

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Bellach, Switzerland

Theodor Schoenenberger