Device for autonomous adjustment of the active length of a balance spring
AssigneeThe Swatch Group Research and Development Ltd
InventorPaulo Bravo
Life of this patent
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Abstract
A device for autonomous adjustment of the active length of a balance spring includes a regulator mounted on a plate with a cock, a balance spring stud holder being pivotally mounted on the cock, the regulator being pivotally mounted on the stud holder and including a pivot arm and device for changing the active length of the balance spring by pivoting the regulator. The device includes an elastic stress device to exert an elastic, return-to-position action on the regulator, and an inertia block, mounted for free rotation on the cock and connected to the pivot arm of the regulator, arranged to move the pivot arm of the regulator between a rest position and a correction position of the device, and simultaneously act on the device for changing the active length of the balance spring.
Claims28
A device for autonomous adjustment of the active length of a balance spring, for an oscillator of the balance/balance spring type, comprising a regulator mounted on a plate of a timepiece movement, with a cock in which a balance staff pivots, the balance spring comprising an inner end integral with the balance staff and an outer end integral with a balance spring stud attached to a stud holder, the stud holder being pivotally mounted on the cock concentrically to the balance staff, the regulator being pivotally mounted on the stud holder concentrically to the balance staff and comprising a pivot arm and means for adjusting the active length of the balance spring by pivoting the regulator;
- the device further includes comprising:
- elastic stress means configured to exert an elastic, return-to-position action on the regulator;
- and
- an inertia block mounted for free rotation on the cock and connected to the pivot arm of the regulator such that a rotation of the inertia block causes a displacement of the pivot arm of the regulator and simultaneously acts on the means for adjusting the active length of the balance spring.
A device for autonomous adjustment of the active length of a balance spring, for an oscillator of the balance/balance spring type, comprising a regulator mounted on a plate of a timepiece movement, with a cock in which a balance staff pivots, the balance spring comprising an inner end integral with the balance staff and an outer end integral with a balance spring stud attached to a stud holder, the stud holder being pivotally mounted on the cock concentrically to the balance staff, the regulator being pivotally mounted on the stud holder concentrically to the balance staff and comprising a pivot arm and means for adjusting the active length of the balance spring by pivoting the regulator;
- the device further comprising:
- elastic stress means configured to exert an elastic, return-to-position action on the regulator;
- and
- an inertia block mounted for free rotation on the plate and connected to the pivot arm of the regulator such that a rotation of the inertia block causes a displacement of the pivot arm of the regulator and simultaneously acts on the means for adjusting the active length of the balance spring.
Dependencies are inferred from the claim text.