EP 2613206 B1 20220511 - Hairspring with two spiral springs with improved isochronism
Title (en)
Hairspring with two spiral springs with improved isochronism
Title (de)
Spirale mit zwei Spiralfedern mit verbessertem Isochronismus
Title (fr)
Spiral à deux ressort-spiraux à isochronisme amélioré
Publication
Application
Priority
EP 12150230 A 20120105
Abstract (en)
[origin: EP2613206A1] The spring (1) has hairsprings (3, 5) comprising curves extending in planes, where each curve has continuously variable pitch. The curves are symmetrical relative to a straight line (A) parallel to the planes, and pass through a median projection plane (P) of an attachment element (4). Each curve is arranged such that specific relation is zero to reduce displacements of center of mass during contraction and expansion. Each hairspring has H-shaped counterweights (8, 8', 9, 9') to compensate for unbalance formed by a mass of the element and personalize anisochronism slope of the balance spring. The specific relation includes a moment of the balance spring of order n, length of the balance spring and curvilinear abscissa along the balance spring to the power of n and parameterization of the balance spring by the abscissa. The balance spring is formed from silicon and includes a part coated with silicon dioxide.
IPC 8 full level
G04B 17/06 (2006.01)
CPC (source: EP US)
G04B 17/063 (2013.01 - US); G04B 17/066 (2013.01 - EP US)
Citation (examination)
EP 2405312 A1 20120111 - MONTRES BREGUET SA [CH]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2613206 A1 20130710; EP 2613206 B1 20220511; CN 103197526 A 20130710; CN 103197526 B 20151021; HK 1187118 A1 20140328; JP 2013140161 A 20130718; JP 5563674 B2 20140730; TW 201341988 A 20131016; TW I569115 B 20170201; US 2013176834 A1 20130711; US 9004748 B2 20150414
DOCDB simple family (application)
EP 12194292 A 20121126; CN 201310001450 A 20130104; HK 14100089 A 20140106; JP 2013000342 A 20130107; TW 101145628 A 20121205; US 201213731486 A 20121231