Control member with a balance wheel and a planar spiral for...

Details Control member with a balance wheel and a planar spiral for... Control member with a balance wheel and a planar spiral for...

2008-03-18

2008-03-18

Bradley, P. Austin (Department: 2833)

Horology: time measuring systems or devices

Oscillating or reciprocating means

Balance wheel type

Reexamination Certificate

active

07344302

ABSTRACT:
A regulating device including a balance (1) and a plane hairspring (2) for a time piece movement, the plane hairspring (2) including a stiffened portion (8) in its outer turn (7) that is arranged to cause the deformations of the turns to be substantially concentric. The spacing (d) between a terminal portion of the outer turn (7) and the last-but-one turn (9) of the hairspring (2) is large enough for said last-but-one turn (9) to remain free radially during expansions of the hairspring (2) up to amplitudes corresponding substantially to the maximum angle of rotation of the balance (1) in the movement.

REFERENCES:
patent: 3154912 (1964-11-01), Pinkas
patent: 3528237 (1970-09-01), Suard
patent: 3826076 (1974-07-01), Tuetey
patent: 327 796 (1958-02-01), None
patent: 697 864 (1953-09-01), None
E. Michel & G. Michel: “Spiraux plats concentriques sans courbes”, Bulletin Annuel de la Société Suisse de Chronométrie, vol. IV, 1957-1963—pp. 162-169, XP002272279.

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