Spring-balance regulating device for keyless watch, has spring, where portion of last external turn of spring before pinning point is twisted in helicoid manner, and portion is twisted between specific times in relation to height of blades

摘要

The device has a beam (1) that is associated with a spring (10), where the spring is formed of a set of concentric blades (24), and a shaft (2) of the device is mounted on the beam. The set of concentric blades is arranged with an inside curve (8) that is rigidly fixed on the shaft. A portion of last external turn (16) of the spring before a pinning point (18) is twisted in a helicoid manner, where the portion of last external turn is twisted between 0.5 and 10 times the height of the blades. An independent claim is also included for a thermal stabilization device.