Astronomic timepiece having a visible element simulating the dis

Details Astronomic timepiece having a visible element simulating the dis Astronomic timepiece having a visible element simulating the dis

1990-05-08

1994-09-06

Roskoski, Bernard

Horology: time measuring systems or devices

Astronomical

368185, 368190, G04B 1926

Patent

active

053454294

ABSTRACT:
The earth ring (8) bears the lunar disc (9) which pivots in a hollow of the surface (8a). On its outer periphery it possesses teeth (17) for driving it from the final wheel set (15) of the stepping transmission gear train (15,24,12). The driving wheel set (12) is activated one step per day from the date wheel. The pinion (20) of the lunar disc (9) is in mesh with the outer teeth (22), normally fixed but which may be displaced by means of the correction arrangement controlled by the stem (30) when it is turned in a predetermined sense. The same correction arrangement also enables one to act on the transmission train (12, 14,15,17). The stem (30) is then driven in a sense opposite to the above which displaces the sliding pinion (36) and enables correction of the position of the lunar disc (9) relative to the earth ring (8) this latter normally effecting a complete rotation in twelve months and the lunar disc (9 ) a complete rotation in about 29.5 days.

REFERENCES:
patent: 246061 (1881-08-01), Blair

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