Flat balance spring for horological balance and balance wheel/balance spring assembly
US8348497B2 · kind B2 · utility
8Cited by
12References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 16, 2010 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | May 18, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B17/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This flat balance spring for a horological balance comprises a wound strip shaped to ensure an approximately concentric development of the balance spring and almost zero force on the pivots and on the fixing point, during a rotation of less than 360° of its inner end relative to its outer end in both directions from its rest position. The stiffness of its strip decreases gradually and through more than 360° from each of its two ends, the lowest stiffness being situated in the median part of the strip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.