One way gear train
AssigneeSociete Suisse pour l'Industrie Horlogere Mangagement Services S.A.
InventorWerner Fluehmann
Life of this patent
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Abstract
A gear train comprising a drive gear, a driven gear and an idler arranged a common plane so that both drive gear teeth and idler teeth mesh with the driven gear teeth. The teeth are asymmetric and the idler and drive gears are reflections of one another about a line. Rotation can be transmitted in one sense only and in direction from drive gear to driven gear only. The arrangement may be advantageously employed in timepieces such as electric wrist watches where a stepping motor drives time indicating hands.
Claims7
A gear train comprising a drive gear having asymmetric teeth, a driven gear having asymmetric teeth arranged and adapted to mesh with the teeth of the drive gear and an idler having asymmetric teeth arranged and adapted to mesh with the teeth of the driven gear the idler having the form of a reflection about a diameter of the drive gear whereby one sense only of rotation and one direction of transmission can occur.
Dependencies are inferred from the claim text.