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US 11,392,090 B2Granted
Mainspring for a movement of a timepiece and method for manufacturing the same
AssigneeNivarox-FAR S.A.
InventorsJonas Vannod, Christian Charbon
Life of this patent
Estimating the term…
Abstract
A mainspring includes a spiral metal strip and a hooking area formed in an inner face of an inner end of the strip, the hooking area including at least one shaped portion and at least one cavity in the inner face of the inner end.
Claims16
A method for manufacturing a mainspring for a movement of a timepiece, comprising:
- producing a spiral metal strip and a hooking area on an inner face of an inner end of said strip, the hooking area including at least one shaped portion and at least one cavity, the at least one shaped portion having a protruding shape complementary to the cavity, wherein
- said producing is devoid of rolling and/or stamping.
Dependencies are inferred from the claim text.