Patent ID: 7480211

Claim:
A secular perpetual calendar for timepieces comprising: a perpetual calendar mechanism; and a centenary mechanism integrated into the perpetual calendar mechanism, the centenary mechanism comprising: a last wheel making one revolution in 400 years, the last wheel carrying a first cam having a first set of cam steps; and a first lever cooperating with the first set of cam steps, a first wheel pivoting on the lever and carrying a satellite, with a February cam of the perpetual calendar mechanism attached to the satellite, wherein the first cam makes one quarter turn every century, and successively presents three low steps of the first set of cam steps, which enable the first lever to move back in such a way that the February cam, on which a second multiple lever will press, is in the same position as for a conventional 28-day month of February, and the first cam presenting a high step of the first set of cam steps to restore the 29 th of February; and a double pin, which functions to restore, after the month of February of a centenary year, the normal rhythm of the perpetual calendar mechanism for a further 99 years, by causing the last wheel, and therefore the first cam, to advance by one eighth of a turn.