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Patent Searching and Data


Title:
HAIRSPRING WITH DEVICE TO PREVENT COILS FROM MOVING CLOSE TOGETHER
Document Type and Number:
WIPO Patent Application WO/2015/090815
Kind Code:
A3
Abstract:
The invention relates to a hairspring comprising a leaf having a polygonal cross-section which is wound onto itself in a plurality of coils. According to the invention, at least one coil comprises a device for preventing coils from moving close together including at least four abutments mounted on a single surface and projecting from the body of said at least one coil of the leaf, each one of said at least four abutments being arranged such as to engage with the facing surface of another coil of the leaf while preventing the other coil from touching said at least one coil in the event of an impact.

Inventors:
CONUS, Thierry (Rebweg 12, Lengnau, CH-2543, CH)
HELFER, Jean-Luc (Rue du Jura 49, Le Landeron, CH-2525, CH)
CABEZAS JURIN, Andrés (Rue du Coin-de-Terre 4, Yverdon, CH-1400, CH)
GASSER, Patrick (Grauholzstr. 64, Ittigen, CH-3063, CH)
Application Number:
EP2014/074976
Publication Date:
June 25, 2015
Filing Date:
November 19, 2014
Export Citation:
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Assignee:
ETA SA MANUFACTURE HORLOGÈRE SUISSE (Schild-Rust-Strasse 17, Grenchen, CH-2540, CH)
International Classes:
G04B17/06; G04B17/26
Foreign References:
US3696687A1972-10-10
EP2434353A12012-03-28
EP2407831A12012-01-18
Attorney, Agent or Firm:
COUILLARD, Yann (ICB Ingénieurs Conseils en Brevets SA, Fbg de l'Hôpital 3, Neuchâtel, CH-2001, CH)
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