Date-display chronometer comprising time-difference operation device

A technology for timepieces and time differences, applied to mechanical devices for time indication, mechanically driven clocks, visually indicating time, etc., can solve problems such as rapid wear of mechanisms and reduction of elastic force

Inactive Publication Date: 2003-03-26
FREDERIC PIGUET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Date-display chronometer comprising time-difference operation device
  • Date-display chronometer comprising time-difference operation device
  • Date-display chronometer comprising time-difference operation device

Examples

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Embodiment Construction

[0017] The present invention comes from the general inventive concept, which includes carrying the real hour and minute display hands by a differential gear, the power output of which is formed by the movement mechanism of the watch movement on the one hand, and by the time difference cam on the other hand , the time difference cam is driven by the calendar mechanism to rotate at a rate of one revolution per year. The real hour and minute hands therefore mesh directly with this movement, keeping the time difference separating it from the civil hour and minute hands completely constant during the 24-hour period separating two consecutive date changes. Likewise the real hour minute hand meshes directly with the differential cam that precisely determines its position relative to the civil time display hand during the daily adjustment.

[0018] The invention will be described in connection with a timepiece of the wristwatch type comprising a time-difference mechanism driven by a t...

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PUM

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Abstract

The present invention concerns a timepiece such as, in particular, a wristwatch, including a watch movement, a running equation of time device, as well as a date mechanism, this timepiece having a pair of hour (22) and minute (24) hands which indicate the civil time, and an additional minute hand (28) which indicates the true time, the daily position of the true time minute hand (28) with respect to the civil time minute hand (24) being determined by the position of an equation of time cam (32) driven in rotation at the rate of one revolution per year by a date mechanism, characterized in that the true time minute hand (28) is driven by a differential gear (50) which has for respective power take-off a gear train (52) driving the civil time minute hand (24) and a transmission member which co-operates with the equation of time cam (32) to transmit the pivoting movement of said cam (32) to the input of the differential gear.

Description

technical field [0001] The invention relates to a timepiece comprising a time-difference mechanism with a display, and more particularly to a time-difference mechanism actuating a solar-time minute hand concentric with the hands set of the movement. Background technique [0002] It is known that there is a time difference between true solar time and mean solar time, or civil time, which corresponds to the duration between two upper orbits on the longitude of the sun's continuous passage through the same place, the civil time Hours represent the duration of all true solar days in a year. The difference between civil time and real time reaches +14 minutes and 22 seconds on February 11 and -16 minutes and 23 seconds on November 4. This value varies only slightly from one year to the next. [0003] In order to indicate the time difference between civil time and real time, certain timepieces include a so-called time-difference operating mechanism, that is, in which the set of h...

Claims

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Application Information

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IPC IPC(8): G04B19/26G04B19/02G04B19/23G04B19/24
CPCG04B19/23G04B19/24
Inventor A·佐格
Owner FREDERIC PIGUET
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