Timepiece with a date mechanism comprising two superposed date rings
US6934221B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2004 |
| Grant date | Aug 23, 2005 |
| Priority date | — |
| Expiry date | Nov 19, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B19/25366
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Date mechanism for a timepiece such as a wristwatch including two superposed respectively lower (6) and upper (4) date rings, whose surface is divided into a plurality of sectors, the upper ring (4) including sixteen sectors, fifteen of which respectively bear fifteen successive markings of a cycle of 31 positions, and the sixteenth of which is an extra sector having an open or transparent aperture (8), whereas the lower ring (6) includes seventeen sectors, sixteen of which bear respectively the other sixteen markings of the cycle of 31 positions, and the seventeenth of which is an extra sector, each of said rings cooperating with drive means such that the markings appear successively in a display zone (20) the date mechanism further including a jumper-effect stopping device (22) able to stop each ring (4, 6) in any desired position, the date mechanism being characterised in that one location on the upper ring (4) and one location on the lower ring (6) is provided with a thinned tooth (14) and (16), located between two successive teeth (10) or (12) of the toothing of the ring (4) or (6) concerned, the position of the drive means with respect to the toothing of the rings (4, 6) bein…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.