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US 2010/0246339 A1Published application
Spring-loaded driving member for timepiece movement
AssigneeMontres Jaquet Droz SA
InventorOlivier Mertenat
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AssigneeMontres Jaquet Droz SA
InventorOlivier Mertenat
Estimating the term…
The invention relates to a driving member for a timepiece movement, that comprises two superimposed coaxial barrels (1, 11) coupled in series, each barrel including a spring provided in a cylindrical housing rotatingly mounted on a common shaft (20). The respective housings (2, 12) of the barrels are positioned opposite each other and do not include a lid, said springs (7, 17) being separated only by a separation washer (26) or a gap. Preferably, the separation washer (26) is made of a sheet of an anti-friction material and extends between the respective outer drums (4, 14) of the barrel housings. This arrangement can be used for increasing the height (H) of the springs, and thereby the amount of energy and the power reserve of the watch for an identical global volume of the driving member, or for reducing the total height of the driving member. The number of parts is also reduced and the mounting is made easier. Such a driving member is particularly intended for watches with a high power reserve.
-6. (canceled)
A spring-loaded driving member for a timepiece movement comprising two coaxial barrels coupled in series, each barrel having a rotatable cylindrical housing provided with an outer tooth arrangement and a base, and a spring rolled up inside the housing and having an outer end coupled to the housing and an inner end coupled to a core, wherein the respective cores of the barrels are interdependently rotatable and the respective bases of the barrels are located axially opposite one another,
Dependencies are inferred from the claim text.