EP 3052992 A1 20160810 - MAINSPRING FOR A MAIN BARREL MINIMIZING WEAR ON THE DRUM
Title (en)
MAINSPRING FOR A MAIN BARREL MINIMIZING WEAR ON THE DRUM
Title (de)
HAUPTFEDER FÜR EIN HAUPTFASS ZUR MINIMIERUNG DES TROMMELVERSCHLEISSES
Title (fr)
RESSORT MOTEUR POUR BARILLET MOTEUR MINIMISANT L'USURE DU TAMBOUR
Publication
Application
Priority
- CH 17062013 A 20131004
- EP 2014070548 W 20140925
Abstract (en)
[origin: WO2015049165A1] The invention relates to a mainspring (1) mounted in a main barrel (30) of an self-winding clock, comprising: a first spiral-shaped spring portion (2) having a first curvature and having an inner end (3) secured to a shaft of a barrel (32); a second spring portion (4) extending from the first spring portion (2) and arranged to interact with a drum of a barrel, the second spring portion (4) having a second curvature a direction opposite that of the first curvature and a curvature radius that decreases from an end that is near the first spring portion (2) towards an outer end (7) of the second spring portion (4); the second spring portion (4) furthermore includes a tangency area (5) having a smaller curvature radius than the curvature radius of the drum (31), such that, when the mainspring (1) is mounted in the barrel (30), the tangency area (5) engages the inner surface of the drum (31) along at least one line of intersection between the tangency area (5) and the inner surface of the drum (31).
IPC 8 full level
G04B 5/24 (2006.01)
CPC (source: EP)
G04B 5/24 (2013.01)
Citation (search report)
See references of WO 2015049165A1
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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2015049165 A1 20150409; CH 708660 A1 20150415; EP 3052992 A1 20160810
DOCDB simple family (application)
EP 2014070548 W 20140925; CH 17062013 A 20131004; EP 14772389 A 20140925