Back to results
US 5,345,429 AGranted
Astronomic timepiece having a visible element simulating the displacement of a star
AssigneeETA SA Fabriques d'Ebauches
InventorJean-Philippe Rebeaud
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeETA SA Fabriques d'Ebauches
InventorJean-Philippe Rebeaud
Estimating the term…
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.
An astronomical timepiece including a temporal reference with a mechanical output having a driving wheel set and a display arrangement including at least one visible element simulating the displacement of a star, wherein the display arrangement comprises a planetary gear train, comprising a satellite bearer having a crown gear, said crown gear being driven by the driving wheel set, a ring, a driving wheel, and a satellite mounted for rotation on the satellite bearer and connected to said driving wheel, said driving wheel directly or indirectly meshing with said ring, said ring being fixed in normal operation, the timepiece further including a correction arrangement, said correction arrangement including a control stem positionable in a correction position, the rotation of said control stem when in said correction position in one sense driving the driving wheel set and in the other sense driving said ring.
Dependencies are inferred from the claim text.