Timepiece comprising a day/night display that takes account of seasonal variations
US10775745B2 · kind B2 · utility
1Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2017 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Dec 8, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B19/25366
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A timepiece movement, a calendar mechanism and device for indicating the sunrise and sunset that takes account of seasonal variations. The simple calendar mechanism includes a display mechanism for displaying the date and a display mechanism for displaying the month. The sunrise and sunset indicating device also includes an annual cam having a profile representative of the tilt of the sun with respect to the equatorial plane and arranged to be driven in rotation via the hour wheel set through a kinematic chain that passes through the month display device and has a transmission ratio of 1:744.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.