Extra-thin watch movement
AssigneeFrederic Piguet S.A.
InventorPierre Mathys
Life of this patent
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Abstract
A manually or automatically wound extra-thin watch movement, comprising at least one barrel (3) and in which all the wheel sets are assembled in cantilever on one sole base plate (1) with the help of one ball bearing only (15 to 21). The ratchet (25) is in the form of a drum surrounding the barrel. It is swivelled by its periphery with the help of at least three rollers, each pivoted on a ball bearing, and the barrel (3) is pivoted within the ratchet by means of a ball bearing (23). This design enables reducing to a minimum the energy losses due to friction.
Claims4
An extra-thin watch movement with manual or automatic winding comprising at least one barrel and in which all the wheel sets are assembled in cantilever on one sole base plate with the help of one ball bearing only, a ratchet being in the form of a drum surrounding the barrel and swivelled by its periphery with the help of at least three rollers, each pivoted on a ball bearing, the barrel being pivoted within the ratchet.
Dependencies are inferred from the claim text.