Patent ID: 9075395
Filing Date: 2015-07-07
Classification: G04B

Abstract:
1. A pallet lever for a timepiece escapement mechanism including a balance provided with a pin of a given pin radius and oscillating over a given radius of gyration, said pallet lever including, on either side of an aperture, a first horn and a second horn for cooperation with a pin of this type, wherein said first and second horns have a symmetrical profile to each other relative to a median plane passing through a pallet lever pivot axis, and each includes a concave inner profile over a first cylindrical sector bordering said aperture and having a first radius of curvature greater than or equal to a sum of said radius of gyration and said pin radius, said concave inner profile being adjacent to a convex outer profile over a second cylindrical sector having a second radius of curvature less than or equal to a difference between said radius of gyration and said pin radius and opposite said aperture.