US 11,988,993 B2
Timepiece escapement mechanism
Stephen Forsey, Les Brenets (CH); Robert Greubel, Le Locle (CH); Fabrice Deschanel, Villers-le-Lac (FR); Christophe Zwahlen, Les Brenets (CH); and Florian Corneille, Mathay (FR)
Assigned to COMPLITIME SA, La Chaux-de-Fonds (CH); and GFPI SA, La Chaux-de-Fonds (CH)
Appl. No. 17/256,687
Filed by COMPLITIME SA, La Chaux-de-Fonds (CH); and GFPI SA, La Chaux-de-Fonds (CH)
PCT Filed Jun. 20, 2019, PCT No. PCT/EP2019/066323
§ 371(c)(1), (2) Date Dec. 29, 2020,
PCT Pub. No. WO2020/007619, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 18181276 (EP), filed on Jul. 2, 2018; and application No. 18209214 (EP), filed on Nov. 29, 2018.
Prior Publication US 2021/0141340 A1, May 13, 2021
Int. Cl. G04B 15/10 (2006.01); G04B 15/02 (2006.01); G04B 15/14 (2006.01)
CPC G04B 15/10 (2013.01) [G04B 15/02 (2013.01); G04B 15/14 (2013.01)] 20 Claims
OG exemplary drawing
 
20. An escapement mechanism for a timepiece, intended to cooperate with an oscillator arranged to perform oscillations, said mechanism comprising:
a counting wheel arranged to advance in rotation by steps in function of the oscillations of said oscillator;
an impulse wheel intended to be kinematically linked with a motive source, said impulse wheel being arranged to be blocked and released periodically under the control of said counting wheel and to supply impulses to said oscillator;
wherein:
when said escapement mechanism is operating, said counting wheel is permanently subjected to a torque;
said counting wheel is arranged to advance in rotation by a half-step of its toothing for each alternation of said oscillator,
wherein said torque, to which said counting wheel is subjected, is supplied via an elastic element arranged to be wound by said impulse wheel, and
wherein a first end of said elastic element is rotationally secured to said impulse wheel, a second end of said elastic element being rotationally secured to a wheel kinematically linked with said counting wheel.