Instantaneous single click perpetual date mechanism
US8711658B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2012 |
| Grant date | Apr 29, 2014 |
| Priority date | — |
| Expiry date | Jul 17, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B19/2536
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Date mechanism for a timepiece including a movement which daily pivots a lever, comprising a perpetual twelve cam with sectors whose depth depends on the duration of the successive months, completing one revolution per year. The mechanism has a single click and includes a single click finger, hinged to said lever and arranged to cooperate with a thirty-one ratchet wheel which pivots integrally with a first thirty-one snail cam arranged to control a date display means, and a second cam including a radial finger; a countdown mechanism whose position is determined by said second cam, adjusting the number of teeth of said wheel to be activated by said click finger according to the current day and current month; and a means of driving said cam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.