Self-starting profile for timepiece escapement
AssigneeETA SA Manufacture Horlogere Suisse
InventorPascal WINKLER
Life of this patent
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Abstract
A timepiece escapement mechanism, including a lever and an escapement wheel, the lever being arranged to cooperate with an inertial mass of a mechanical oscillator, and, at pallets carried by or included in the lever, with teeth of the escapement wheel, where the contact between a pallet and an escapement tooth includes at least three zones, a rest zone where the torque is of negative direction, where the angle between the normal to the contact and the radial of the lever is negative, a first zone corresponding to the first half angle of lift where the torque is of positive direction, where the angle ω1 is positive, and a second zone corresponding to the second half angle of lift where the torque is of positive direction, where the angle ω2 is positive.
Claims15
A timepiece escapement mechanism, comprising at least one lever and at least one escapement wheel, said at least one lever being arranged to cooperate with an inertial mass of a mechanical oscillator, and subjected, directly or indirectly, to the action of elastic return device included in said mechanical oscillator and, said at least one lever being arranged to further cooperate, at pallets carried by or included in said lever, with teeth included in said at least one escapement wheel, wherein at least one said pallet and/or at least one said tooth includes an impulse zone including two zones, one for an angular portion where said elastic return device tend to drive said escapement wheel, and the other for another angular portion where said elastic return device tend to oppose said escapement wheel, said two zones being arranged so as to minimise the maximum moment of said elastic return device seen by said escapement wheel.
Dependencies are inferred from the claim text.