Escapement device for a timepiece

An escapement device for a timepiece movement, comprising:

• a first escapement mobile element, pivotally mounted about a first axis of rotation, arranged to be engaged with a train of the timepiece movement, such as a motor train, to receive a motive force, and comprising a plurality of first blocking surfaces and a first drive toothing,
• a second escapement mobile element, pivotally mounted about a second axis of rotation, comprising a plurality of second blocking surfaces and a second drive toothing engaged with the first drive toothing to transmit the motive force of the first escapement mobile element to the second escapement mobile element,
• an inertial element, pivotally mounted about a third axis of rotation, arranged to present oscillations each comprising a first vibration and a second vibration,
• a blocking mobile element, pivotally mounted about a fourth axis of rotation, comprising:
• a first blocking surface portion, arranged to come into contact with one of the plurality of first blocking surfaces in order to block the rotation of the first escapement mobile element,
• a second blocking surface portion, arranged to come into contact with one of the plurality of second blocking surfaces in order to block the rotation of the second escapement mobile element,
• an impulse receiver, arranged to receive a first impulse from the first escapement mobile element during a first vibration of an oscillation of the inertial element, and to receive a second impulse from the second escapement mobile element during a second vibration of said oscillation of the inertial element,
• an impulse transmitter, arranged to transmit at least part of the first impulse or of the second impulse to the inertial element,
• characterized in that the first blocking surface portion is arranged so that a first force, exerted on the blocking mobile element by the first escapement mobile element blocked by the first blocking surface portion, passes substantially in the vicinity of the fourth axis of rotation, in particular passes through the fourth axis of rotation, and in that the second blocking surface portion is arranged so that a second force, exerted on the blocking mobile element by the second escapement mobile element blocked by the second blocking surface portion, passes substantially in the vicinity of the fourth axis of rotation, in particular passes through the fourth axis of rotation.