Title:
CLOCK MOVEMENT HAVING A BALANCE AND A HAIRSPRING
Document Type and Number:
WIPO Patent Application WO/2014/072781
Kind Code:
A3
Abstract:
The invention relates to a clock movement which includes a balance and hairspring oscillator and an escapement engaging with the oscillator. The outer coil of the hairspring includes a stiffened portion (9") arranged such as to at least partially compensate for the variation in the operation of the movement in accordance with the oscillatory amplitude of the balance due to the escapement. The hairspring also includes at least one of the following features: a) a distance (R') between the inner end of the hairspring and the centre of rotation of the hairspring smaller than 400 μm, b) a Grossmann curve (10) defined by the inner coil of the hairspring, and c) a stiffened portion defined by the inner coil of the hairspring.
Inventors:
BUCAILLE JEAN-LUC (FR)
Application Number:
PCT/IB2013/002355
Publication Date:
June 26, 2014
Filing Date:
October 22, 2013
Export Citation:
Assignee:
PATEK PHILIPPE SA GENEVE (CH)
International Classes:
G04B17/06
Foreign References:
| EP1445670A1 | 2004-08-11 | |||
| CH327796A | 1958-02-15 | |||
| DE102009048733A1 | 2011-04-14 | |||
| EP1473604A1 | 2004-11-03 | |||
| EP1612627A1 | 2006-01-04 |
Attorney, Agent or Firm:
MICHELI & CIE SA (1226 Thônex, 1226 Thônex, CH)
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