Patent ID: 7708454

Claim:
A sprung balance regulating system of a mechanical timepiece movement, the sprung balance regulating system comprising: (a) an escape wheel, wherein the escape wheel includes i. a central rigid zone; and ii. arms extending radially from the central zone towards a tip zone, wherein the tip zone includes teeth; (b) a balance carrying an impulse pin; and (c) a pivoted lever arranged to cooperate with the impulse pin, wherein rotation of the escape wheel is controlled by shocks caused by collisions between the teeth and the pivoted lever, wherein the arms are flexible to allow a small tangential movement, or radial movement, or tangential and radial movement, of the teeth in order to absorb the shocks caused by collisions between the teeth and the pivoted lever, wherein the arms are curved gradually towards an orientation tangential to the rotation of the escape wheel, wherein the thickness of the arms gradually decreases from the central zone to the tip zone, and wherein the teeth are formed by the ends of the arms.