US Patent 7494268 Detent escapement for timepiece

The escapement includes a large roller 4 carrying an impulse pallet stone 5 surmounted by a first finger-piece 14 and a small roller 23 in which a notch 22 is made. A blocking member carries, on the one hand, a device 80 for locking the escape wheel 2, and on the other hand, a second finger-piece 11 arranged for cooperating with the first finger-piece 14, the blocking member also including a follower 20 ending in a beak 21 which acts on the small roller and particularly with notch 22 which is made therein. The first and second finger-pieces 14 and 11 are respectively rigidly secured to the table roller and the blocking member.