Ecole Polytechnique Federale De Lausanne

Asgalium Unitec Sa

The Swatch Group Research and Development Ltd

Societe Anonyme De La Manufacture D'horlogerie Audemars Piguet & Cie

Manufacture D'horlogerie Audemars Piguet Sa

Ecole Polytechnique Féderale De Lausanne (epfl)

Ilan Vardi

Billy Nussbaumer

Simon Henein

Mohammad Hussein Kahrobaiyan

Lennart Rubbert

Olivier Mathez

Etienne Thalmann

A mechanical isotropic harmonic oscillator including a frame, a mass configured to oscillate, and three flexure rods, each flexure rod connecting the mass to the frame.

General 2 degree of freedom isotropic harmonic oscillator and associated time base without escapement or with simplified escapement

A horological detent escapement for a horological movement arranged to transmit a torque from said horological movement to an oscillating regulating organ of said horological movement, the regulating organ comprising a first mobile body and the escapement comprising a second mobile body and an escapement wheel. Said escapement wheel being arranged so as to transmit, during a half-phase of each oscillation of the regulating organ, a torque to said regulating organ via a direct impulse. The second mobile body comprises an indirect impulse means arranged so as to be in contact with the escapement wheel during normal operation and be out of contact during the other half-phase of each oscillation of the regulating organ when the escapement wheel does not transmit torque to the regulating organ, so as to transmit torque to said regulating organ via an indirect impulse, following an inadvertent movement or inadvertent stoppage of the horological movement.

Automatically starting and secured detent escapement for a timepiece

A mechanical isotropic harmonic oscillator including a two rotational degrees of freedom linkage supporting an orbiting mass with respect to a fixed base with at least one spring element having isotropic and linear restoring force properties, such that a high degree of spring stiffness and reduced mass isotropy provides for reduced sensitivity to linear and angular accelerations.

General two degree of freedom isotropic harmonic oscillator and associated time base

The present invention relates to a wristwatch comprising a mechanical clock movement with a tuning fork resonator. The oscillator preferably comprises a material A with a low internal friction. In the oscillator of the invention, the unwanted symmetrical oscillations are avoided, for example, by the choice of the materials from which the tuning fork is manufactured. According to preferred embodiments, the rod and/or fastening of the oscillator comprises a material having greater internal friction than that of said material A, such that the quality factor Qof the symmetrical oscillations is reduced, in contrast to the quality factor Qof the anti symmetrical oscillation mode.

Tuning fork mechanical oscillator for clock movement

A mechanical isotropic harmonic oscillator including a two translational degrees of freedom linkage supporting an orbiting mass with respect to a fixed base with springs having isotropic and linear restoring force properties.

Isotropic harmonic oscillator and associated time base without escapement or with simplified escapement

A tuning-fork mechanical resonator for a mechanical clock movement with free escapement includes an oscillator of the tuning fork type, of which at least one first prong is intended to oscillate about a first axis and bears at least one first pin associated with at least one first fork tooth of a pallet assembly to cause this assembly to pivot between first and second angular positions and alternately lock and release an escapement wheel. The resonator comprises a conversion member secured to the first pin and designed to on the one hand, convert the oscillations of the first prong of the oscillator into rotational movements of the pallet assembly by transmitting first impulses thereto, and on the other hand, transmit mechanical energy from the pallet assembly to the first prong of the oscillator in the form of impulses.

Tuning-fork resonator for mechanical clock movement

A magnetic resonator, for a timepiece, is disclosed which comprises an oscillator of the tuning-fork type having first and second branches in the form of a U of which at least a first branch supports a first permanent magnet defining a first magnetic field, an escape wheel, designed to be arranged in engagement with a watchwork gear train in order to allow it to be driven by a power source of the timepiece and, situated within range of said first permanent magnet in order to undergo the influence of the first magnetic field. In particular, provision is made for the escape wheel to be free and support at least two permanent magnets, preferably at least four, arranged so that the vibrations of the first branch of the tuning fork, on the one hand, control the rotation speed of the escape wheel and, on the other hand, are sustained periodically by the magnetic interaction between the first permanent magnet of the tuning fork and the permanent magnets of the escape wheel in order to define a free escapement.

Growing community of inventors

Neuchâtel, Switzerland

Ilan Vardi