Patent ID: 8303167

Claim:
An escapement mechanism arranged to transmit mechanical energy pulses from a driving source to an oscillating regulator of a timepiece via a blade spring ( 12 ) operating in a buckling manner about a curvature point, said blade spring ( 12 ) being capable of accumulating the energy from the driving source between two pulses and transmitting it to said oscillating regulator upon each pulse via first ( 18 ) and second ( 26 ) yokes, characterized in that said blade spring ( 12 ) is mounted on a chassis ( 50 ) symmetrically deformable in relation to a first axis (AA) passing through the axes of rotation of the balance, yokes ( 18 , 26 ) and via the curvature point and in relation to a second axis (BB), perpendicular to the first and passing through the ends of the blade spring ( 12 ).