Curve elevation hairspring i.e. Breguet hairspring, for movement of timepiece, has elevation device placed between external spire and terminal curve, and two unique parts integrated for increasing precision of development of hairspring

摘要

The hairspring (1) has a spiral-spring (3) formed from a single piece and coaxial with a collet (5), and an elevation device (9) placed between an external spire (15) of the spiral-spring and a Philips type terminal curve (7), where the hairspring is made of silicon based material. Two unique parts are integrated for increasing precision of development of the hairspring. The elevation device includes a post (17) connecting an end of the external spire to an end of the curve terminal and forming a single piece with an assembly of the spiral-spring and the collect. An independent claim is also included for a method for manufacturing a curve elevation hairspring.