Breguet overcoil balance spring made of micro-machinable material
AssigneeMontres Breguet S.A.
InventorsAlain Zaugg, Christophe Bifrare
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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.
Claims10
A method of manufacturing a Breguet overcoil balance spring that includes the following steps:
- a) selectively etching at least one cavity in a layer of micro-machinable material to define a hairspring mounted coaxially with a collet;
- b) selectively etching at least one cavity in a layer of micro-machinable material to define a mechanical fastener;
- c) selectively etching at least one cavity in a layer of micro-machinable material to define a terminal curve;
- and
- d) assembling the mechanical fastener between said balance spring and said terminal coil to form the elevation curve balance spring.
Dependencies are inferred from the claim text.