EP 2138912 B1 20120704 - Horological hairspring with concentric development
Title (en)
Horological hairspring with concentric development
Title (de)
Spiralfeder für Uhrwerk mit konzentrischer Entwicklung
Title (fr)
Spiral d'horlogerie à développement concentrique
Publication
Application
Priority
EP 08011404 A 20080624
Abstract (en)
[origin: EP2138912A1] The hairspring has a plane central part (10) extended from an interior point (11) to an exterior point (12), and a movable attaching unit (13) maintaining concentric spires of the part, during oscillations of the hairspring in a timepiece movement. The unit has flexible terminating peripheral curves (14, 15), e.g. blade or blade portion, located in a plane of the central part. The curves are separately extended from the exterior point to end points (16, 17), respectively, where the end points e.g. attachment points, are fixed to a frame. An independent claim is also included for a timepiece movement comprising a frame.
IPC 8 full level
G04B 17/06 (2006.01)
CPC (source: EP)
G04B 17/066 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2138912 A1 20091230; EP 2138912 A8 20100224; EP 2138912 B1 20120704
DOCDB simple family (application)
EP 08011404 A 20080624