Patek Philippe Grandmaster Chime Ref. 5175 Patents and Innovations (Straight from Patek Philippe)
Patent: Alarm mechanism with time strike
Mechanism that acoustically indicates a preset 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
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 which exceeds 1700 gmm.
Patek Philippe Grandmaster Chime Ref. 5175 – Patek Philippe 175th Anniversary Watch Making of Video
Patek Philippe Grandmaster Chime Ref. 5175 – Patek Philippe 175th Anniversary Watch Video Gallery