Patent ID: 8087819

Claim:
Direct-impulse escapement, especially of detent type, for a horological movement, comprising: a balance wheel attached to an impulse element, an escape wheel whose teeth intersect the path of the impulse element, a detent rocker having an arresting element and a clearance element, means for inserting the arresting element into the path of the teeth of the escape wheel, a clearance pin rotating integrally with the balance wheel, and means for engaging said clearance pin ( 7 , 11 d ) with the clearance element of the rocker once per period of oscillation of the rocker to clear the arresting element from the escape wheel tooth; said means for inserting the arresting element into the path of the teeth of the escape wheel comprising a sliding surface integral with the detent rocker and arranged so as to move into the path of the teeth of the escape wheel when the arresting element leaves it, this sliding surface being shaped so that the force applied to it by a tooth of the escape wheel causes the arresting element of the detent rocker to move back into the path of the teeth of the escape wheel; the arresting element of the detent rocker comprising a safety surface situated outside of the path of the teeth of the escape wheel ( 1 ) and adjacent to this path when the detent rocker is in the unlocking position, in order to prevent the arresting element ( 4 ) from moving into the path of the teeth of the escape wheel while the latter is communicating a movement impulse to the balance wheel.