Timepiece movement including two opposed analog displays

Details Timepiece movement including two opposed analog displays Timepiece movement including two opposed analog displays

1994-01-26

1994-12-27

Roskoski, Bernard

Horology: time measuring systems or devices

Display trains

368223, 368140, G04B 1902

Patent

active

053771710

ABSTRACT:
The movement, of the conventional type with barrel (10) and spring balance, includes two time displays with hands, the hands (3m, 3h, 3s) of one of the displays, arranged opposite one of the principal faces (1) of the movement, being driven in rotation in a known manner by a gear train comprising a toothed center wheel (12) fixed onto an arbor (13) with a pinion (11) meshing with the barrel. Opposite the other principal face (2) is found another time display, the hands (5m, 5h) of which are driven by another gear train (35, 36, 37, 38, 39, 40, 41), a toothed wheel (35) of which is fixed onto the arbor (13) of the center wheel (12). This arrangement permits reducing to a minimum the height of the other gear train and to guarantee the same small backlash for the hands of both displays. The barrel spring (10) is wound by an automatic winding arrangement comprising an oscillating mass (7) arranged opposite the other principal face (2) of the movement. A time setting stem (6) capable of occupying a neutral axial position and two drawn-out positions, enables, in cooperation with a transmission mechanism (47-56), correcting the indications of one of the displays in one of the drawn-out positions and the indications of the other display in the other drawn-out position.

REFERENCES:
patent: 1432566 (1922-10-01), Metcalf
patent: 1850184 (1931-03-01), Spainhower
patent: 4370063 (1983-01-01), Lee
patent: 4720820 (1988-01-01), Siefert
patent: 5297112 (1994-03-01), Cohen et al.

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