FIELD: clockwork mechanisms.
SUBSTANCE: present invention relates to a balance spring (thread) for a mechanical clockwork mechanism of small clock. The balance spring with a rhomboid cross-section for the mechanical clockwork mechanism of small clock is described, wherein the balance spring is made in the form of a spiral spring, and it has a cross-section of a turn. According to the invention, it is provided that the cross-section of the turn of the spiral spring has a shape of rhomb, wherein the rhomb has four sides, two first angles with the first inner angle, two second angles with the second inner angle, the first diagonal that connects both first angles to each other, and the second diagonal that connects both second angles to each other, wherein the first diagonal is shorter than the second diagonal, and wherein the first inner angle is more than the second inner angle.
EFFECT: stabilization of the balance spring in the oscillation plane, increase in the accuracy, variation of spring rigidity, simplification of the manufacture.
16 cl, 7 dwg
