Patent · US Active

Running equation of time mechanism controlled by a differential device

US11281161B2 · kind B2 · utility

0Cited by

1References

3Claims

0Family size

Assignee

Montres Breguet S.A. · CH

Inventors

Sylvain Dauby · Le Sentier, CH
Alain Zaugg · Le Brassus, CH

Key dates

Filing date	Dec 14, 2018
Grant date	Mar 22, 2022
Priority date	—
Expiry date	Jul 30, 2040

Classification

Technology area (CPC G)Physics
CPC primaryG04B27/001
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A running equation of time mechanism includes civil hour and minute hands to indicate civil time and a concentric true minute hand to indicate true time. The running equation of time mechanism includes an equation of time cam and a differential gear device, a first input of which is formed by a civil minute pipe on which a civil minute hand is pressed, and a second input of which is formed by the equation of time cam. The differential gear device includes a planetary reducer wheel set via which the civil minute pipe drives a civil hour pipe on which is pressed the civil hour hand, and a planetary multiplier wheel set via which the civil hour pipe drives a true minute pipe on which is pressed the true minute hand.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.