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Optimised escapement with security means

  • US 9,665,067 B2
  • Filed: 12/09/2014
  • Issued: 05/30/2017
  • Est. Priority Date: 12/23/2013
  • Status: Active Grant
First Claim
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1. A timepiece escapement mechanism comprising:

  • a stop member between a resonator and an escape wheel set subjected to a drive torque lower than or equal to a substantially non-zero nominal torque, the stop member comprising at least a first actuator arranged to cooperate with the resonator and at least a second actuator arranged to cooperate with the escape wheel set, the at least one first actuator comprising at least a first magnetically charged or ferromagnetic, or respectively electrically charged or electrostatically conductive pole piece; and

    the resonator comprising at least one first magnetically charged or ferromagnetic, or respectively electrically charged or electrostatically conductive track, and at least the first pole piece and/or the first track creating a first magnetic or electrostatic field in a first air gap between the at least one first pole piece and the first track;

    wherein the first field has an intensity ensuring relative driving of the stop member and of the resonator provided that the torque applied to the escape wheel set is lower than or equal to the nominal torque,wherein the stop member and/or the resonator comprises first arresting means for limiting relative movement between the first actuator and the resonator when the torque applied to the escape wheel set is greater than the nominal torque, andwherein the first arresting means comprises a magnetic or electrically charged barrier arranged to create a magnetic or electrostatic field higher than the first magnetic or electrostatic field beyond the first air gap.

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