US 9,811,054 B2
System for securing a balance spring
Jean-Louis Bertrand, Feigères (FR); and Pascal Billet, Morbier (FR)
Assigned to ROLEX SA, Geneva (CH)
Filed by ROLEX SA, Geneva (CH)
Filed on Nov. 25, 2015, as Appl. No. 14/952,414.
Claims priority of application No. 14195264 (EP), filed on Nov. 27, 2014.
Prior Publication US 2016/0154379 A1, Jun. 2, 2016
Int. Cl. G04B 17/06 (2006.01); G04B 18/02 (2006.01); G04B 17/32 (2006.01); G04D 7/10 (2006.01); G04B 18/06 (2006.01)
CPC G04B 17/063 (2013.01) [G04B 17/325 (2013.01); G04B 18/02 (2013.01); G04B 18/06 (2013.01); G04D 7/10 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A balance spring system of a horology movement, comprising:
a balance spring;
a movement blank;
a first element for indexing a position of an outer end of the balance spring relative to the movement blank; and
a unit for connection of the outer end of the balance spring to the movement blank,
the first indexing element being designed so as to be displaceable relative to the connection unit,
wherein the position of the balance spring relative to the blank is memorized even if the balance spring system is dismantled by disassembling the balance spring from the movement blank.