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AssigneeThe Swatch Group Research and Development Ltd
InventorsMohammad Hussein KAHROBAIYAN, Romain Le Moal, Julien Christan, Ivan Hernandez
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A balance spring for a watch resonator mechanism, the balance spring (100) including a flexible strip (2) wound on itself in a plurality of coils, the strip (2) having a predefined stiffness, the balance spring (100) including means for adjusting its stiffness, including a flexible element (5) arranged in series with the strip (2), the flexible element (5) connecting one end (4) of the strip (2) to a fixed mount (38), so as to add additional stiffness to the continuation of the strip (2), the flexible element (5) preferably having a stiffness greater than that of the strip (2), the flexible element (5) including two flexible parts (15, 16) each connecting the strip (2) to the fixed mount (38), the two flexible parts (15, 16) being arranged relative to each other with axial symmetry along an axis (A) preferably passing substantially through the centre (0) of the balance spring.
A balance spring for a watch resonator mechanism, the balance spring comprising a flexible strip wound on itself in a plurality of coils, the strip having a predefined stiffness, the balance spring including means for adjusting its stiffness, the adjustment means comprising a flexible element arranged in series with the strip, the flexible element connecting one end of said strip to a fixed mount so as to add additional stiffness to the continuation of the strip, the flexible element having a stiffness greater than that of the strip, wherein the flexible element includes two flexible parts each connecting the strip to the fixed mount, the two flexible parts being arranged relative to each other with axial symmetry along an axis, the axis passing substantially through the centre of the balance spring.
Dependencies are inferred from the claim text.