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US 4,671,670 AGranted
Wristwatch
AssigneePforzheimer Uhren-Rohwerke PORTA GmbH
InventorWolfgang Kroner
Life of this patent
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AssigneePforzheimer Uhren-Rohwerke PORTA GmbH
InventorWolfgang Kroner
Estimating the term…
The operating mechanism for a watch indicating arrangement, especially for a date indicating structure of an electrically operated wristwatch provided with an indicating element which is advanced periodically and operated by a drive mechanism associated with the watch, the operating mechanism includes a non-uniform transmission gear structure with a driving and a driven gear which have at least one engagement mode in which the non-uniform rotational speed of the driven gear is relatively low while the available torque is relatively high and the driven gear has associated therewith means for engaging the indicating structure for advancing the indicating element a predetermined step with each revolution of the driven gear wherein the means for engaging the indicating element are so arranged that engagement of the indicating element for its advance takes place while the non-uniform transmission is in the highest torque providing engagement mode.
An operating mechanism for a watch indicating arrangement, especially for a date indicating structure of an electrically operated wristwatch having an indicating element which is advanced periodically and operated by a drive mechanism associated with the watch, said operating mechanism including a non-uniform transmission gear structure with a driving and a driven gear having at least one engagement mode in which the non-uniform rotational speed of the driven gear is relatively low while the available torque is relatively high, said driven gear having associated therewith means for engaging said indicating structure for advancing said indicating structure a predetermined step with each revolution of the driven gear, said means for engaging said indicating structure being so arranged that engagement of said indicating structure takes place while said non-uniform transmission is in the extreme torque providing engagement mode.
Dependencies are inferred from the claim text.