Timepiece with a date mechanism comprising two superposed date rings
US6925032B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2004 |
| Grant date | Aug 2, 2005 |
| Priority date | — |
| Expiry date | Nov 22, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B19/25
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Date mechanism for a timepiece such as a wristwatch including two superposed respectively upper (4) and lower (6) 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 (4, 6) cooperating with drive means such that the markings of the lower ring appear successively in a display zone (30), the date mechanism being wherein each ring (4, 6) includes two peripheral toothings extending along two stepped, respectively upper and lower rows, the teeth (10, 12) of the upper and lower rows of the upper ring (4) being superposed, whereas the teeth (18, 20) of the upper and lower rows of the lower ring (6) are staggered, one location (14, 16; 24, 26) of each of the toothings of the upper (4) and lower (6) rings being tooth free, and in that said dat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.