Patent ID: 7731415

Claim:
An escapement for a timepiece, the escapement comprising: (a) a pallet articulated on a staff and disposed to transmit energy to a balance; and (b) an escapement wheel set articulated on an arbour, wherein the pallet co-operates with the escapement wheel set and the escapement wheel set comprises a plurality of teeth uniformly spaced around the escapement wheel set, and the pallet includes an entry pallet-stone and an exit pallet-stone arranged to receive alternately an impulse from one of the teeth borne by the escapement wheel set and for acting as a locking plane for said one of the teeth, wherein the escapement wheel set comprises first and second integral and coaxial wheels, each of the first and second integral and coaxial wheels including the same number of teeth, wherein the entry pallet-stone and the exit pallet-stone each includes a locking face, wherein the entry and exit pallet-stones co-operate, respectively, via the locking faces with the first and second integral and coaxial wheels to transmit energy from the escapement wheel set to the balance, and wherein a peripheral radius of the first wheel is greater than a peripheral radius of the second wheel.