Patent ID: 7301854
Filing Date: 2007-11-27
Classification: G04B

Abstract:
1. An annual calendar mechanism for a timepiece comprising a date drive wheel set completing one revolution in twenty four hours, said wheel set being fitted with a first finger driving through one step and once a day a first stage of a date ring carrying thirty one inner teeth, said wheel set being fitted with a second finger driving through one step and at the end of each month of less than thirty one days one of the five projections of a plate secured to an annual wheel arranged coaxially to the date ring, said mechanism further comprising an intermediate wheel connecting, at the end of each month, said annual wheel to a second stage of said date ring, wherein the annual wheel comprises twice as many teeth as there are months in the year and wherein the intermediate wheel comprises a first wheel meshed with the annual wheel and a second wheel fixed onto and arranged coaxially to the first wheel, said second wheel being meshed, at the end of each month, with a snug arranged inside the second stage of the date ring.