Patent ID: 9471036
Filing Date: 2016-10-18
CPC Classification: G04B

Claim Text:
1. A timepiece barrel for pivotal assembly between a plate and a bar, the timepiece barrel comprising: at least one spring housed between a pivoting drum and a cover and hooked between, at an outer end thereof, said drum, and at an inner end thereof, an arbor which pivots integrally with a ratchet about a pivot axis, said barrel including a one-piece sub-assembly coaxial to said pivot axis and including said arbor and a boss including a collar to limit axial shake of said drum, wherein said collar carries a pivotal driver to drive pivoting of said ratchet, which is axially free in the direction of said pivot axis, wherein shake of said drum is limited relative to said one-piece sub-assembly by an upper surface of said drum which is limited by a lower shoulder of said one-piece sub-assembly, wherein shake of said ratchet is limited relative to said bar, by an upper surface of said ratchet which is limited by a thread or a lower surface of said bar or of a jewel comprised in said bar, wherein shake of said ratchet is limited relative to said drum by a lower surface of said ratchet which is limited by an upper surface of said drum, wherein shake of said cover is limited relative to said plate, by a lower surface of said cover which is limited by an upper surface of said plate or of a jewel comprised in said plate, wherein said spring is made of a multiphase, cobalt-nickel-chromium based alloy, comprising 44 to 46% cobalt, 20 to 22% nickel, 17 to 19% chromium, 4 to 6% iron, 3 to 5% tungsten, 3 to 5% molybdenum, 0 to 2% titanium, 0 to 1% beryllium, and having a Young's modulus of between 200 and 240 GPa and a shear modulus of between 80 and 100 GPa, wherein said spring has a width to thickness ratio of between 3 and 23, and the ratio between the maximum radius of a bearing shoulder of the spring of said arbor and the thickness of said spring is between 3 and 9.