BALANCE CLOCK SPRING Russian patent published in 2017 - IPC G04B1/14 

FIELD: physics.

SUBSTANCE: balance spring (1) comprising two pairs (50) of coils, each of which is formed of the adjacent coils (51, 52) respectively comprising locking means (11) and quincuncially staggered auxiliary locking means (12), together defining for each pair (50) the corresponding maximum angular displacement (CA) of the coils during their local connection at the accelerations of the balance spring (1), which are larger than the desired values in order to limit the amount of the active coils. The locking means (11) and the auxiliary locking means (12) of the pairs (50) define different values (CA) of the maximum angular displacement to limit gradually the amplitude of turning between the ends (3, 4) of the balance spring (1) during the accelerations, which are greater than the desired values, wherein one of the above pairs (50) interacts with the abutment earlier than the other pair, to change gradually the resulting stiffness of the balance spring (1) by using the sequential deactivation or reactivation of its coils (5).

EFFECT: improving the device reliability.

8 cl, 3 dwg