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US 8,764,282 B2Granted
Spiral spring
AssigneeManufacture et fabrique de montres et chronometres Ulysse Nardin Le Locle SA
InventorsStéphane Von Gunten, Pierre Gygax, Lucas Humair
Life of this patent
Estimating the term…
Abstract
A spiral spring (10) for the movement of a watch, includes a plurality of coplanar leaves (10a, 10b) wound into one another. Furthermore, the inner ends of each leaf are rigidly connected to a single collet (12). The leaves (10a, 10b) and the collar (12) are produced as a single part.
Claims25
A spiral spring of a watch movement, including a plurality of coplanar leaves wound into one another,
- wherein the inner ends of each leaf being secured to a single collet,
- wherein the leaves, the collet are made monolithically, and
- wherein the outer ends of each leaf are connected to each other by a rigid frame provided with at least one portion to receive an attachment organ, said frame, the leaves and the collet being made monolithically, and
- wherein the last coil of the leaves includes a reinforcement, said reinforcement defining a segment of the last coil less than the entire length of the last coil and said reinforcement being not located at an end of the last coil.
1 more element
Dependencies are inferred from the claim text.