Balance-spring with altered outer curve
AssigneeNivarox-FAR S.A.
InventorsJean-Bernard Peters, Marco Verardo
Life of this patent
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Abstract
The balance-spring (1) includes a plurality of coils (3) of which the end (6, 8) of the outer curve (2) is rigidified by deformation in order to define accurately the setting point (7) of said balance-spring, said deformation being able to be achieved by bending the end (6) of the outer curve (2) through 90° in a plane perpendicular to the height of the balance-spring (1) or by folding down through 180° a portion of the end (8) of the outer curve (2) against the inner or outer face of said end (2).
Claims4
A balance-spring having an inner curve and an outer curve, and including a plurality of coils for a sprung-balance regulating device, wherein the inner curve is secured to a balance staff pivoting in a balance-cock, and the outer curve of said balance-spring is directly or indirectly secured to a balance-spring stud by an end portion, wherein the end of the outer curve is rigidified by a deformation made in the vicinity of the balance-spring stud to define accurately the setting point of said balance-spring, and
- wherein the deformation is achieved by twisting the end of the outer curve through 90° in a plane perpendicular to the height of the balance-spring.
A balance-spring having an inner curve and an outer curve, and including a plurality of coils for a sprung-balance regulating device, wherein the inner curve is secured to a balance staff pivoting in a balance-cock, and the outer curve of said balance-spring is directly or indirectly secured to a balance-spring stud by an end portion, wherein the end of the outer curve is rigidified by a deformation made in the vicinity of the balance-spring stud to define accurately the setting point of said balance-spring, and
- wherein the deformation is achieved by bending a portion of the end of the outer curve through 180° against the inner or outer face of said end.
Dependencies are inferred from the claim text.