These are the Patek Philippe Grandmaster Chime Ref. 5175 patents and innovations
Patent: Alarm mechanism with time strike
A mechanism that acoustically indicates a pre-set alarm time with hour, quarter-hour, and minute strikes using the chiming mechanism of the minute repeater.
Patent: Isolation of the Grande Sonnerie in the Silence mode
A mechanism that totally uncouples the Grande Sonnerie from the movement when the Silence mode is selected, eliminating friction and thus power consumption.
Patent: Selection of strikework operating mode
Mechanism that allows the automatic time strike to be selected or disabled with a single slide switch: Grande Sonnerie, Petite Sonnerie or Silence. Formerly, two separate switches were needed to make these settings.
Patent: Date repeater
Mechanism that obtains date information from the perpetual calendar and forwards it to the repeating mechanism. Manufacture president Thierry Stern is the inventor.
Patent: Reversible wristwatch case
Wristwatch case with rotating and latching devices in the lugs, allowing it to be turned along the axis from 12 to 6 o’clock and locked in either of 2 positions.
Patent: Mechanism for a four-digit year display
Mechanism that automatically synchronizes the four-digit year display with the leap-year cycle and allows convenient correction of both displays in either direction.
Innovation: The strikework differential
An innovative masterpiece of micromechanical engineering (not patented): the differential between the strikework double barrels and the two strikework mechanisms for the Grande Sonnerie (incl. minute repeater and alarm) and the date repeater. It has a diameter of 7.2 mm and consists of 19 separate parts, one of which is an 11-part ball bearing with 7 balls with a diameter of 0.3 mm each. Despite its small size, it is robust enough to transmit the torque of the strikework barrels that exceeds 1700 gmm.
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