Bi-material self-compensating balance-spring

Details Bi-material self-compensating balance-spring Bi-material self-compensating balance-spring

2007-06-12

2007-06-12

Miska, Vit W. (Department: 2833)

Horology: time measuring systems or devices

Oscillating or reciprocating means

Balance wheel type

Reexamination Certificate

active

11169911

ABSTRACT:
The balance-spring is formed by a first assembly, comprising the coils (3) and the outer curve (2), made in a first material such as Elinvar having an elastic torque that is insensitive or almost insensitive to elongation, temperature and magnetic field variations, and by a second assembly secured to the first assembly, comprising in particular the inner curve (4) made of a second material essentially selected for its mechanical properties and for the shapeability of said inner curve (4) along the most favourable contour for concentric expansion of the balance-spring, such as a Grossmann curve (14), said second assembly also being able to comprise a collet (5).

REFERENCES:
patent: 209642 (1878-11-01), Berlitz et al.
patent: 1931251 (1933-10-01), Chamberlain
patent: 3186157 (1965-06-01), Favret et al.
patent: 3956881 (1976-05-01), Vuille et al.
patent: 2002/0167865 (2002-11-01), Tokoro et al.
patent: 1 431 844 (2004-06-01), None
patent: 1 445 670 (2004-08-01), None
patent: WO 327 796 (1958-02-01), None

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