Patent ID: 7458717

Claim:
A detent escapement for timepiece comprising a toothed escape wheel, pivoted on a first axis (X 1 ), a balance, pivoted on a second axis (X 2 ) and whereto an impulse pallet is coaxial and secured, a detent supporting a locking pallet designed to cooperate with a first tooth of said escape wheel, along a certain length of penetration, to block said first tooth in a locking phase, said detent being pivoted on a third axis (X 3 ) to be capable of freeing said first tooth in an unlocking phase, said impulse pallet being designed to cooperate with a second tooth of said escape wheel to receive an impulse from the latter after said unlocking phase, said first and second teeth being adjacent and arranged on either side of a center straight line (L) joining said first (X 1 ) and second (X 2 ) axes in said locking phase, wherein it also comprises a limiting plate, coaxial and rotationally secured to said balance, having a periphery comprising a substantially circular main portion as well as a cutout arranged so as to be positioned across from said locking pallet in said unlocking phase, and wherein said limiting plate is dimensioned so as to define a security distance, separating said locking pallet from said circular main portion when they are positioned facing each other, less than said length of penetration.