Timepiece barrel

Abstract

The barrel (1) has a spring (7) accommodated between a drum (6) and a cover (8) and attached between the drum at its outer end and a shaft (3) at its inner end. The shaft is secured to pivot with a ratchet (2) around a pivot axis. The shaft comprises, around a cylindrical barrel (31) along the pivot axis, a projecting hook (32) for fixing the spring. The shaft includes a prominent or re-entrant driving unit (42) cooperating with a complementary driving unit (23) for pivotingly driving the ratchet. An independent claim is also included for a clockwork movement.

Description

technical field [0001] The invention relates to a ratchet for winding a timepiece barrel, said ratchet comprising an axial passage for fitting the ratchet on an arbor comprising a protruding or recessed pivot drive. [0002] The invention also relates to a timepiece barrel for pivotal assembly between a base plate and a bridge and comprising a barrel housed between a pivoting barrel and a cover at its outer end Hooked at its inner end is at least one mainspring between said barrel and an arbor pivoting integrally with said ratchet about a pivot axis. [0003] The invention also relates to a timepiece movement comprising at least a baseplate and bridges and a barrel of the above-mentioned type. [0004] The invention also relates to a watch comprising a movement of the type described above. [0005] The present invention relates to the field of timepiece mechanisms and, more particularly, of energy storage mechanisms for mainspring barrels, strike barrels or similar type devi...

AI Technical Summary

Problems solved by technology

[0010] In particular, it is not enough to simply reduce all dimensions, since then the cross-section of the material would not be sufficient to ensure fatigue strength

[0011] So the problem is to reconcile the smallest possible diameter with allowing the largest possible power reserve, taking advantage of the rigidity in the ratchet drive

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