Watch whose movement includes a constant force device
US7473027B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 10, 2006 |
| Grant date | Jan 6, 2009 |
| Priority date | — |
| Expiry date | Oct 10, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B15/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The movement (1) of the watch includes a constant force device (14) inserted in a going rain connecting a spring barrel (2) to an escapement having an escapement wheel and including a third wheel which completes one revolution in several minutes. The input element of the constant force device (14) is the third wheel (12), the output element of said device (14) being a second third wheel (20) connected via gearing to the seconds pinion (38). The second third wheel is secured to a star wheel (26) that only releases the train upstream of the constant force device once per minute, thus forming an independent minutes display because the minute hand (7) jumps forward at each minute. This arrangement minimizes the transmission of shocks between the constant force device and the escapement and can advantageously be combined with a tourbillon (40).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.