EP 0886195 A1 19981223 - Auto-compensating spring for mechanical oscillatory spiral spring of clockwork movement and method of manufacturing the same
Title (en)
Auto-compensating spring for mechanical oscillatory spiral spring of clockwork movement and method of manufacturing the same
Title (de)
Selbstkompensierende Spiralfeder für mechanische Uhrwerkunruhspiralfederoszillator und Verfahren zu deren Herstellung
Title (fr)
Spiral autocompensateur pour oscillateur mécanique balancier-spiral de mouvement d'horlogerie et procédé de fabrication de ce spiral
Publication
Application
Priority
EP 97810393 A 19970620
Abstract (en)
The autocompensating hairspring is made from a paramagnetic alloy of. Niobium and Zirconium containing 5%-25% of. Zirconium by weight and having a thermal coefficient of. Young's. Modulus such that a function (1/E).(DE/DT) + 3 alpha s - 2 alpha b tends to zero, E being. Young's. Modulus, T the temperature, alpha s the thermal coefficient of expansion of the hairspring and alpha b the thermal coefficient of expansion of the balance wheel. The alloy should include at least 500 ppm by weight of a doping agent containing oxygen and is formed from wire by pressing or drawing in oxygen followed by cold working to form a ribbon. The ribbon is spiralled and heat treated at pressure to reduce the thermal coefficient of the Young's. Modulus by controlled precipitation of phases rich in. Zirconium.
IPC 1-7
IPC 8 full level
C22C 27/02 (2006.01); C22F 1/00 (2006.01); C22F 1/18 (2006.01); G04B 17/06 (2006.01); G04B 17/22 (2006.01)
CPC (source: EP KR US)
C22C 27/02 (2013.01 - EP KR US); G04B 17/066 (2013.01 - EP); G04B 17/227 (2013.01 - EP KR US)
Citation (search report)
Designated contracting state (EPC)
CH DE ES FR GB IT LI
DOCDB simple family (publication)
EP 0886195 A1 19981223; EP 0886195 B1 20020213; CN 1129822 C 20031203; CN 1206861 A 19990203; DE 69710445 D1 20020321; DE 69710445 T2 20021010; EA 001063 B1 20001030; EA 199800463 A1 19981224; ES 2171872 T3 20020916; HK 1016703 A1 19991105; JP 3281602 B2 20020513; JP H1171625 A 19990316; KR 100725400 B1 20071227; KR 19990007057 A 19990125; SG 65072 A1 19990525; TW 354393 B 19990311; US 5881026 A 19990309
DOCDB simple family (application)
EP 97810393 A 19970620; CN 98114991 A 19980619; DE 69710445 T 19970620; EA 199800463 A 19980619; ES 97810393 T 19970620; HK 99101623 A 19990415; JP 17311198 A 19980619; KR 19980022712 A 19980617; SG 1998001147 A 19980527; TW 87109578 A 19980616; US 9875498 A 19980617