TIMEPIECE SPRING MADE OF AUSTENITIC STAINLESS STEEL

WIPO Patent Application WO/2014/206582

A3

The invention relates to a timepiece spring (1) made of austenitic stainless alloy, steel comprising a base consisting of iron and chromium. The thickness thereof is smaller than 0.20 mm. Said spring comprises by weight: chromium having a minimum value of 15% and a maximum value of 25 %; manganese having a minimum value of 5% and a maximum value of 25 %; nitrogen having a minimum value of 0.10% and a maximum value of 0.90%; carbon having a minimum value of 0.10% and a maximum value of 1.00 %; the total of the contents by weight of carbon and of nitrogen as a proportion of the total is 0.40% to 1.50%; the (C/N) ratio of the content by weight of carbon as a proportion of the total relative to that of nitrogen is 0.125 to 0.550; impurities and added metals outside of iron having a minimum value of 0% and a maximum value of 12.0%; and iron having a value rounding out the 100 %. The invention is used with a barrel spring.

CHARBON CHRISTIAN (CH)
PLANKERT GUIDO (CH)

PCT/EP2014/055858

December 23, 2015

March 24, 2014

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NIVAROX SA (CH)

G04B1/14; C22C38/00; C22C38/18; C22C38/38; F16F1/02

CH703796B1	2012-03-30
EP2455508A1	2012-05-23

VERMOT M ED - VERNOT M ET AL: "Traité de construction horlog GBP ere, Mécanique / Théorie; Energie de la montre mécanique", 2011, TRAITÉ DE CONSTRUCTION HORLOGÈRE, PPUR, SUISSE, PAGE(S) 24 - 29, ISBN: 978-2-88074-883-8, XP002735465
AURÈLE MAIRE: "Les barillets à rotation rapide", JOURNAL SUISSE D'HORLOGERIE,, vol. 5/6, 1 January 1968 (1968-01-01) - 1968, pages 213 - 219, XP001441388

ICB INGÉNIEURS CONSEILS EN BREVETS SA (Neuchâtel, CH)

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