Breguet overcoil balance spring made of micro-machinable material
AssigneeMontres Breguet S.A.
InventorsAlain Zaugg, Christophe Bifrare
Life of this patent
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Abstract
The invention relates to a Breguet overcoil balance spring (1) that includes a hairspring (3) mounted in a single part, made of micro-machinable material, and coaxially with a collet (5). According to the invention, the balance spring has a terminal curve (7) made of micro-machinable material and an elevation device (9) made of micro-machinable material between the outer coil (15) of the hairspring and the terminal curve to improve the concentric development of the balance spring. The invention also relates to the method of manufacturing the balance spring. The invention concerns the field of timepiece making.
Claims20
A Breguet overcoil balance spring including:
- (a) a single part made of micro-machinable material, including a hairspring and a collet coaxial to the hairspring;
- (b) a terminal curve made of micro-machinable material;
- and
- (c) an elevation device made of micromachinable material disposed between the outer coil of said hairspring and said terminal curve to improve the concentric development of said balance spring.
Dependencies are inferred from the claim text.