Method for manufacturing a balance-spring obtained according to

Details Method for manufacturing a balance-spring obtained according to Method for manufacturing a balance-spring obtained according to

1998-10-02

1999-05-25

Miska, Vit

Horology: time measuring systems or devices

Oscillating or reciprocating means

Balance wheel type

368178, G04B 1704

Patent

active

059075244

ABSTRACT:
A method for manufacturing a balance-spring for a clockwork movement wherein a spring is formed by winding, from a wire or metal strip, said spring including an inner end intended to be fixed to a balance and a outer end zone intended to be fixed to the balance-spring stud and wherein the whole spring is subjected to a first heat treatment subsequent to the winding step of said wire. The method of the invention is characterized in that it further includes an additional step consisting in subjecting at least said outer end zone to a second heat treatment.
This method improves in particular the shock resistance of the balance-spring.

REFERENCES:
patent: 3599423 (1971-08-01), Beguin
patent: 3934403 (1976-01-01), Tilse
patent: 3958410 (1976-05-01), Bell

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