US 7,494,268 B2
	Detent escapement for timepiece
Thierry Conus, Lengnau (Switzerland); and Andrés Cabezas Jurin, Yverdon-les-Bains (Switzerland)
Assigned to Montres Brequet SA, L'Abbaye (Switzerland)
Filed on Mar. 28, 2006, as Appl. No. 11/277,652.
Claims priority of application No. 05006851 (EP), filed on Mar. 30, 2005.
Prior Publication US 2006/0221774 A1, Oct. 05, 2006
This patent is subject to a terminal disclaimer.
Int. Cl. G04B 15/00 (2006.01)

U.S. Cl. 368—127  [368/131]

6 Claims

1. A detent escapement for a timepiece including an escape wheel fitted with teeth, a balance onto whose staff there are secured rollers including a large roller provided with an impulse pallet stone and surmounted by a first actuating finger-piece, and a small roller in the circular periphery of which a notch is made, and a blocking member in the form of a lever hinged on a pin, said blocking member carrying means for locking the escape wheel, a second actuating finger-piece and a follower ending in a beak arranged for cooperating with a rising edge of the notch of the small roller wherein the first and second actuating finger-pieces are rigidly secured respectively to the large roller and to the blocking member and arranged for cooperating with each other such that when the rollers are rotating in a first direction, the first finger-piece drives the second finger-piece to release the locking means from the escape wheel, the beak of the follower being then driven by the rising edge of the notch to re-engage the locking means in the escape wheel, and such that when the rollers are rotating in a second direction opposite to the first, the first finger-piece drives the second finger-piece to keep the locking means engaged in the escape wheel.