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.

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.

A control mechanism for control of a plurality of timepiece displays, including a group with one first display and one second display which are separate, driven, according to a reference period, by a timepiece movement, and including, for each group of displays, a train provided to drive, according to a control period, a control moving body, this mechanism including, for each group, a first control element, for control of the first display, and a second control element, for control of the second display, at different moments within the control period, and control device for disengaging the first and the second control elements, including a control lever, which is provided to pivot with a to-and-fro motion, according to a limited angular course, and which supports the first control element and the second control element.

The invention concerns a running equation of time mechanism including a hand arrangement whose purpose is to indicate civil time by means of an hour hand and a minute hand, and a true minute hand concentric with the civil minute hand, and which indicates the true solar minute, wherein the running equation of time mechanism also includes an equation of time cam having a profile which is determined by the difference, on each day of the year, between civil time, and true time, wherein this equation of time cam is driven in rotation by a calendar mechanism, wherein the position of the true minute hand is determined by the position of the equation of time cam, wherein the running equation of time mechanism also includes 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, wherein 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.

A single-hand or single-indicator timepiece that can simultaneously identify both the hour and minute portion of a given time is present herein. The timepiece includes an indicator structured to rotate about the face of the timepiece and point to the hour element of the time via a distal end thereof. In addition, the same indicator includes a minute identifying portion disposed along a length thereof that will align with a rotationally disposed minute disc. The minute disc includes indicia representative of the minutes evenly spaced radially about its surface in a clockwise ascending order. As the minute disc rotates counterclockwise and the indicator rotates clockwise, the indicator will simultaneously identify the hour element at its distal end and the minute element via the relative position of the minute identifying portion and the minute disc.

A single-hand or single-indicator timepiece that can simultaneously identify both the hour and minute portion of a given time is present herein. The timepiece includes an indicator structured to rotate about the face of the timepiece and point to the hour element of the time via a distal end thereof. In addition, the same indicator includes a minute identifying portion disposed along a length thereof that will align with a rotationally disposed minute disc. The minute disc includes indicia representative of the minutes evenly spaced radially about its surface in a clockwise ascending order. As the minute disc rotates counterclockwise and the indicator rotates clockwise, the indicator will simultaneously identify the hour element at its distal end and the minute element via the relative position of the minute identifying portion and the minute disc.

The device for coordinated actuation of two functions of a timepiece comprises one or a plurality of cams (7; 51, 53) arranged to be driven by the movement of the timepiece and of which the respective profile or profiles each comprise a discontinuity (9; 52, 53); and a first (11a, 11b; 49, 61) and a second (13a, 13b; 63) transmission member each comprising a cam follower (11a, 13a; 61, 64), the cam follower (11a; 61) of the first transmission member being arranged to cooperate with the profile of the cam (7) or of a first (51) of the cams (51, 53) and to fall periodically into the discontinuity (9; 52) of the profile of the cam (7) or of said first (51) of the cams (51, 53), the cam follower (13a; 64) of the second transmission member being arranged to cooperate with the profile of the cam (7) or of a second (53) of the cams (51, 53) and to fall periodically, with the same period as the falls of the cam follower (11a; 61) of the first transmission member, into the discontinuity (9; 54) of the profile of the cam (7) or of the second (53) of the cams (51, 53), the falls of the cam follower (11a; 61) of the first transmission member being offset in time with respect to those of the cam follower (13a; 64) of the second transmission member.