Horology: time measuring systems or devices – Chronological – With mechanical or electromechanical driven display
Patent
1997-02-03
1998-07-21
Roskoski, Bernard
Horology: time measuring systems or devices
Chronological
With mechanical or electromechanical driven display
368110, 368112, G04B 2708
Patent
active
057843422
ABSTRACT:
The control mechanism for displaying hours and minutes includes a tilting member (15) biasing against, under the effect of a return spring and via a pawl (18), a spirally shaped cam (12) located at the center of the movement, and which makes a full rotation in one hour. The tilting member (15) is lifted progressively by the action of the cam (12) to fall back instantly, once each hour. During this instantaneous falling back motion of the tilting member (15), a toothed sector (23) carried by the same drives, via a train of gears (24, 25, 26), a central pinion (27) carrying the minute hand. Thus, once at each hour, the minute hand is instantly reset to its initial position. The tilting member (15)carries a pawl (30) cooperating, at each of the instant falling back motions of the tilting member, with a star wheel with twelve branches, which rotates at the center of the movement and which carries a disk indicating hours, of which the display it thus of the so-called "incremental" type.
REFERENCES:
patent: 4050234 (1977-09-01), Dubois et al.
patent: 4389122 (1983-06-01), Toshio
patent: 5235562 (1993-08-01), Vaucher
patent: 5339293 (1994-08-01), Kamiyama et al.
Gerald Genta S.A.
Roskoski Bernard
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