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Title:
OPTIMISED TIMEPIECE BARREL
Document Type and Number:
WIPO Patent Application WO/2015/090938
Kind Code:
A3
Abstract:
The invention relates to a timepiece barrel (1) comprising a drum (2) with a first spring bearing surface (20) of a chamber (4) for holding a spring (3), comprising a bore (11) for guiding the pivotal movement of a core (9) and bordered by a lower abutment bearing surface (12) adjacent to said side inner wall (5), and by an outer abutment bearing surface (13). The first spring bearing surface (20) on the chamber (4) side comprises a DLC coating, and the bore (11) is free from any DLC coating. The invention also relates to a method for manufacturing such a barrel including: manufacturing such a drum (2); protecting at least the bore (11) in order to prevent the effects of an anti-wear or DLC treatment; and performing a DLC treatment on the entire drum (2) with the exception of the area thus protected.

Inventors:
KAESER, Sébastien (Ch. Alfred-Borel 57b, Bevaix, CH-2022, CH)
NICOUD, Serge (Les Condémines 11, Le Landeron, CH-2525, CH)
RÖTHLISBERGER, Marc (Sandrainstrasse 76, Bern, CH-3007, CH)
Application Number:
EP2014/076225
Publication Date:
June 25, 2015
Filing Date:
December 02, 2014
Export Citation:
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Assignee:
ETA SA MANUFACTURE HORLOGÈRE SUISSE (Schild-Rust-Strasse 17, Grenchen, CH-2540, CH)
International Classes:
G04B1/16
Domestic Patent References:
2013-09-12
Attorney, Agent or Firm:
ICB INGÉNIEURS CONSEILS EN BREVETS SA (à l'attention de M. Eric Giraud, Fbg de l'Hôpital 3, Neuchâtel, CH-2001, CH)
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