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EP3379342A1 - Device comprising a quick-adjustment spring engaging with a mobile of a timepiece - Google Patents

Device comprising a quick-adjustment spring engaging with a mobile of a timepiece Download PDF

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Publication number
EP3379342A1
EP3379342A1 EP17162423.2A EP17162423A EP3379342A1 EP 3379342 A1 EP3379342 A1 EP 3379342A1 EP 17162423 A EP17162423 A EP 17162423A EP 3379342 A1 EP3379342 A1 EP 3379342A1
Authority
EP
European Patent Office
Prior art keywords
spring
mobile
finger
flexible portion
toothing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17162423.2A
Other languages
German (de)
French (fr)
Other versions
EP3379342B1 (en
Inventor
Frédéric Dreyer-Gonzales
Arnaud HOURIET
Frédéric Rondeau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Officine Panerai AG
Original Assignee
Officine Panerai AG
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Publication date
Application filed by Officine Panerai AG filed Critical Officine Panerai AG
Priority to EP17162423.2A priority Critical patent/EP3379342B1/en
Publication of EP3379342A1 publication Critical patent/EP3379342A1/en
Application granted granted Critical
Publication of EP3379342B1 publication Critical patent/EP3379342B1/en
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/28—Adjustable guide marks or pointers for indicating determined points of time
    • G04B19/283—Adjustable guide marks or pointers for indicating determined points of time on rotatable rings, i.e. bezel
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • G04B11/003—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with friction member, e.g. with spring action
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/22—Arrangements for indicating different local apparent times; Universal time pieces
    • G04B19/23—Arrangements for indicating different local apparent times; Universal time pieces by means of additional hands or additional pairs of hands
    • G04B19/235—Arrangements for indicating different local apparent times; Universal time pieces by means of additional hands or additional pairs of hands mechanisms for correcting the additional hand or hands

Definitions

  • the present invention relates to a device comprising a fast adjusting spring cooperating with a mobile of a timepiece, wherein the spring has a reduced risk of rupture and a longer life than a conventional quick-adjusting spring.
  • the present invention relates in particular to a device in which the mobile comprises a rotating bezel.
  • GTT Greenwich Mean Time
  • a GMT watch typically comprises an elastic clutch device comprising a spindle spring.
  • the spindle spring allows the time setting of the second time zone, by moving the second hour hand (or GMT hand) in successive jumps of an entire hour.
  • the first hour hand, the minute hand and the second hand are not influenced by this operation.
  • the figure 4 shows such spring pin 1 cooperating with a star 4 to twelve teeth 41 kinematically connected to the GMT needle.
  • the spring 1 comprises two flexible arms 21 and two fingers 3 exerting a compressive force on the teeth 41 of the star 4. When the fingers 3 move between a hollow between two successive teeth 41 and the top of one of the teeth, the arm 21 are biased.
  • spindle springs of this type are typically made of "maraging C300" or “Durnico®” steel or the like. These Spindle springs have a limited life, ranging from 4 (element in Durnico) to 20 years (element in Nivaflex). The life is a random, due in particular to the length of the arms 21 and their small sections. However, it is difficult to make such a spring with larger arm sections without losing the elastic properties of the arms, necessary for the proper functioning of the spring. The available manufacturing techniques impose a ratio between the thickness and the width of the arms at a ratio close to 1.
  • An object of the present invention is to provide a device comprising a rapid adjustment spring free from the limitations of known devices, particularly in terms of freedom of design including its form factor, its thickness and / or its width.
  • Another object of the invention is to provide a device comprising a rapid adjustment spring of compact geometry and which reduces the risk of rupture and the random nature of the break.
  • a device comprising a fast adjusting spring cooperating with a mobile of a timepiece, the spring comprising a finger and a flexible part, the finger cooperating with the mobile so as to be movable in a maximum displacement by a movement of the mobile and to exert a force against the mobile through the flexion of the flexible portion; at least the flexible portion of the spring being made of an amorphous metal alloy, and wherein the device cooperates with a rotating bezel.
  • the amorphous metal alloy in which at least the flexible portion of the spring is made has a ratio of the elastic limit on its Young's modulus which is at least 0.010, preferably 0.015, and more than preferably at least 0.02.
  • the dimensioning of the flexible portion limits the ratio of the maximum stress on the elastic limit to 0.70 at the maximum and preferably 0.64 at the maximum, during the maximum displacement of the finger.
  • the constraints on the form factors are much less severe compared to conventional materials.
  • a quick-adjust spring 1 is shown at figure 1 according to one embodiment.
  • the spring 1 is intended to operate in an elastic clutch device of a secondary display indicating the time zone time (not shown), for example by moving a needle (also not shown) in successive jumps of a whole hour .
  • the spring 1 comprises a flexible portion 2 having two flexible arms 21, each having an arc shape so that the two arms form a continuous geometry and closed on itself.
  • Each of the arms 21 ends with a finger 3 arranged to cooperate with the teeth 41 of a star 4 to twelve teeth 41.
  • figure 1 an hour wheel 6 is also shown.
  • the hour wheel 6 is typically driven by a timer (not shown) and itself drives the star 4 in rotation.
  • the finger 3 comprises a projection 31 which is housed in a hollow between two successive teeth 41 of the star with twelve teeth 41.
  • the arms 3 exert a compressive force on the teeth 41 of the star 4.
  • the projections 31 of the fingers 3 of the spring 1 deviate from their rest position in a hollow between two teeth 41 of the star 4 and fall into the immediately following hollow under the effect of their elasticity and the compressive force exerted by the flexible portion 2.
  • the spring 1 thus makes it possible to define twelve stable positions for the secondary hour hand.
  • the two arms 21 are substantially symmetrical so that the two fingers 3 are arranged diametrically opposed, each of the fingers 3 exerting a restoring force towards the axis 42 of pivoting of the star 4.
  • the configuration of the arms 21 allows each fingers 3 to exert a symmetrical force towards the pivot axis 42 of the star 4.
  • the maximum displacement of the finger 3 corresponds to the spacing of the finger 3 between a first position of the spring 1 where each of the fingers 3 are in a hollow between two teeth 41 and a second position of the spring 1 where the fingers 3 are each on the top of a tooth 41.
  • the maximum displacement of the finger 3 therefore corresponds generally to the height of the teeth 41.
  • the deformation of the finger and the spring may be greater if there is pre-arming at rest to ensure the shock resistance of the needle or the indicator associated with star 4.
  • the figure 1 shows the spring in the first position.
  • the spring is shown in the second position.
  • Each of the fingers 3 may comprise a pin 8 slidable in an oblong opening (not visible) made in another component (as the hub of the hour wheel 6) and adapted to receive the pin 8.
  • the oblong openings allow to guide the fingers 3 and impose them a precise positioning.
  • the oblong openings may also be of rectangular shape or any other suitable form.
  • At least the flexible portion 2 of the spring 1 is made of an amorphous metal alloy having a ratio of the elastic limit stress ⁇ lim on its Young's modulus which is at least 0.010, preferably 0.015, and still preferably at least 0.02.
  • a ratio of the elastic limit stress ⁇ lim on its Young's modulus which is at least 0.010, preferably 0.015, and still preferably at least 0.02.
  • the assembly of the spring 1 is manufactured in the massive amorphous metal alloy.
  • the amorphous metal alloy is selected from a group comprising a metal glass.
  • the metallic glasses do not have a precise crystallographic structure and are in a vitreous state. This gives them very particular properties. From a mechanical point of view, the phenomena of deformation and rupture known in crystalline metals are no longer necessary. It has also been shown that the chemical stability of solid amorphous alloys is superior to that of conventional alloys.
  • the metallic glasses have a relatively low Young's modulus.
  • Young's modulus of a metal glass is about two times lower than that of an alloy such as X2NiCoMo 18-9-5 steel known under the name "maraging C300" or “Durnico®” while having a limit at break substantially equivalent to that of Durnico.
  • the Durnico is typically used in watchmaking for the manufacture of complicated parts with high spring properties and fatigue resistance.
  • a metal glass spring will have an elongation at break approximately twice as large as for the same Durnico spring. It is therefore possible to operate a metal glass spring over a larger deformation range.
  • the figure 3 represents the spring 1 showing simulations of the displacements of the arms 21 and the fingers 3 of the spring 1, as well as the stresses undergone by the different parts of the spring 1.
  • the displacements and the simulated stresses are shown for the spring 1 in the second position, that is to say when the fingers 3 are each at the top of one of the teeth 41.
  • the spring 1 is made of zirconia-based metal glass, Zr (Zr-BMG) characterized by a density of 6830 kg / m 3 , an elastic limit stress ⁇ lim of 1620 N / mm 2 and a Young's modulus of 81000 N / mm 2 .
  • the Zr-BMG alloy can include copper, nickel and aluminum as well.
  • the maximum displacement of each of the arms 21, between the first position and the second position of the spring 1, is 0.26 mm (at the middle of the length of the arm 21).
  • the maximum displacement of each of the fingers 3, between the first position and the second position of the spring 1, is 0.19 mm.
  • the maximum stress ⁇ max calculated under these conditions is between 1028 N / mm 2 and 1032 N / mm 2 which results in a ratio ⁇ max / ⁇ lim of 0.64. No fatigue aging was found by the inventors after 10 7 Maximum displacement cycles fingers 3. The only failure observed was attributed to phenomena of wear caused by friction between the spring 1 and 4 star.
  • the figure 4 shows a conventional spindle spring 1 made in Durnico® alloy, cooperating with a star 4 to twelve teeth 41.
  • the spring 1 is shown (in black) in a position where each of the fingers 3 are in a hollow between two teeth 41 and is shown (in wire) in a position where each of the fingers 3 are on the top of one of the teeth 41.
  • figure 5 represents the same type of simulations performed for the spring of the figure 3 .
  • Durnico® alloy is characterized by a density of 8.1 g / cm 3 , an elastic limit stress ⁇ lim between 1800 N / mm 2 and 2200 N / mm 2 and a Young's modulus of 195000 N / mm 2 .
  • the elastic limit stress ⁇ lim of the Durnico is similar to that of the metal glass Zr-BMG but its Young's modulus is about twice as high.
  • the flexible arms 21 must be longer when the spring 1 is manufactured in Durnico. We notice the arms 21 longer in the geometry of the spring 1 of the figure 4 as well as the folding of the arms more marked.
  • the maximum stress ⁇ max calculated is between 1681 N / mm 2 and 1718 N / mm 2 , which results in a ratio ⁇ max / ⁇ lim of 0.95 for a module of Young of 1800 N / mm 2 and 0.78 for a Young's modulus of 2200 N / mm 2 .
  • Such values for the ratio ⁇ max / ⁇ lim are high, making the spring sensitive to oligocyclic fatigue.
  • the metallic glasses having a Young's modulus smaller than for the alloys commonly used for horological applications, but a similar limit of rupture to these alloys makes it possible to exploit the metal glass spring over a wider range of deformation (the elongation at break is about twice as large as for the Durnico).
  • the properties of metal lenses allow the adoption of a spring geometry that is more compact and reduces stress concentrations.
  • the stresses are distributed in a more homogeneous way in the spring and the metallic glass works in a field more distant from the elastic limit, thus reducing the risk of rupture and the random nature of the rupture.
  • the metal glass spring 1 also has improved fatigue strength, reduced sensitivity to corrosion, and a reduced coefficient of friction compared to a spring made of a conventional alloy.
  • the form factor allowed by the use of this material is also of primary interest.
  • the above description describes a spindle spring for an elastic clutch of a secondary display indicating the time of the time zone.
  • the invention is not limited to such a spring but also applies to any type of quick adjustment spring and / or elastic member intended to operate in a watch movement.
  • the metal-glass spring of the invention may be a quick-setting spring, a rocker spring, a ratchet spring, a driving finger, or a jumper such as a pull-cord or a jumper of calendar settings.
  • the solid amorphous metal alloy, or the metallic glass can be shaped starting from a liquid alloy.
  • the solidification is then carried out with a very high cooling rate in order to avoid the crystallization of the material, but such a high speed greatly limits the maximum thickness that can be achieved.
  • Some massive amorphous metal alloys can be cooled at significantly lower speeds while maintaining an amorphous structure. These amorphous metal alloys allow the use of a much wider range of forming processes. For example, these alloys make it possible to manufacture solid metal glass parts by injection, thus making it possible to obtain more precise shape tolerances than by conventional stamping.
  • alloys also have a much more stable amorphous phase, which makes it possible to carry out various rework operations on the parts, without the material recrystallising.
  • finishes for example, polishing or satin finishing
  • a laser engraving method has been developed to meet the needs of industrial applications.
  • Metal glass injection processes require copper or silicon molds to ensure efficient cooling.
  • the thicknesses of the manufactured parts are limited to a few millimeters in order to extract enough heat and to allow a sufficiently fast cooling.
  • the quick-adjusting spring 1 can be used in combination with a rotatable bezel 5 rotatable and indexable in rotation, relative to a middle component 7 of a timepiece.
  • An indexing mobile (or toothed ring) 4 has an internal toothing 41.
  • the indexing mobile is intended to be fixedly placed in the middle part component 7.
  • the quick adjustment spring comprises a ratchet ring 50 comprising a plurality of elastic strips 2 each having one end secured to the ring 50 and the other free end.
  • the indexing mobile 4 and the ring 50 are shown in isolation at the figure 7 .
  • each elastic lamella 2 extend in recesses 51 that the ring 50 comprises.
  • the free end of each elastic lamella 2 comprises a finger 3 whose shape is adapted to cooperate with the teeth of the toothing 41 of the indexing mobile 4
  • the ratchet ring 50 comprises three elastic strips 2.
  • the ratchet ring 50 is arranged to come together in a fixed manner with the bezel 5 and the indexing unit 4 to be fixedly assembled to the middle part component 7.
  • the finger 3 of the resilient lamellae 2 cooperates with the teeth of the toothing 41 of the indexing wheel 4, thus making it possible to angularly index the rotating bezel 5 on the middle part component 7.
  • the maximum displacement of the finger 3 is determined by the profile of the teeth 41.
  • the configuration of the ratchet ring 50 comprising the elastic strips 2 described above is suitable for angular indexing applications in a single direction of rotation (for example a telescope).
  • the elastic strips 2 may have a closed geometry.
  • the two ends of the elastic strip can be fixed (secured) to the ratchet ring 50 and the finger 3 arranged so that the elastic strip 2 is on either side of the finger 3.
  • the finger 3 may correspond to the top of the elastic strip 2 convex relative to the inner diameter of the ratchet ring 50.
  • the ratchet ring 50 may comprise a substantially annular elastic blade on which is mounted one or more fingers 3 (which may take the form of a roller).
  • the indexing mobile 4 can then comprise a toothing 41 having a continuous profile (for example a profile of sinusoidal shape).
  • the arrangement of the elastic blade 2 and the finger 3 relative to the toothing 41 of the indexing mobile 4 may be such that the finger 3 exerts a pressure radially on the toothing 41, axial or partly radial and axial.
  • the figures 6 and 7 show an example where the finger 3 exerts a pressure radially on the toothing 41.
  • An example of the finger 3 exerting a pressure axially on the toothing 41 could correspond to a configuration where the finger 3 (and the elastic strip 2) exerts a pressure in a direction substantially perpendicular to the axis of rotation of the telescope 5.
  • At least the elastic lamella 2 is made of an amorphous metal alloy, for example comprising a metal glass.
  • the elastic strip 2 may be integrally formed with the ratchet ring 50. Alternatively, the elastic strip 2 may be separated from the ratchet ring 50 or mounted in an articulated manner on the ratchet ring 50.
  • the amorphous metal alloy in which at least the elastic lamella 2 is made has a ratio of the elastic limit ( ⁇ lim ) on its Young's modulus of at least 0.010, preferably at least 0.02 and more preferably at least 0.015.
  • the design of the elastic lamella 2 limits the ratio of the maximum stress ⁇ max to the elastic limit ⁇ lim to 0.70 at most, preferably 0.64 to the maximum, during the displacement of the finger 3 on the indexing wheel 4.
  • the amorphous metal alloy makes it possible to obtain favorable elastic properties and a limited bulk of the quick adjustment spring 1.
  • the amorphous metal alloy also makes it possible to obtain good tribological properties for at least the elastic strip 2 and to limit the wear, and therefore the resistance in time, of the device comprising the quick adjustment spring 1 and the indexing mobile 4.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

La présente invention concerne un dispositif comportant un ressort de réglage rapide (1) coopérant avec un mobile (4) d'une pièce d'horlogerie, le ressort (1) comprenant un doigt (3) et une partie flexible (2), le doigt (3) coopérant avec le mobile (4) de sorte à être déplaçable selon un déplacement maximal par un mouvement du mobile (4) et à exercer une force contre le mobile (4) grâce à la flexion de la partie flexible (2); au moins la partie flexible (2) du ressort étant fabriquée dans un alliage métallique amorphe; le mobile comprenant une lunette tournante.The present invention relates to a device comprising a fast adjusting spring (1) cooperating with a mobile (4) of a timepiece, the spring (1) comprising a finger (3) and a flexible part (2), the finger (3) cooperating with the mobile (4) so as to be movable in a maximum displacement by a movement of the mobile (4) and to exert a force against the mobile (4) thanks to the flexion of the flexible part (2) ; at least the flexible portion (2) of the spring being made of an amorphous metal alloy; the mobile comprising a rotating bezel.

Description

Domaine techniqueTechnical area

La présente invention concerne un dispositif comprenant un ressort de réglage rapide coopérant avec un mobile d'une pièce d'horlogerie, dans lequel le ressort a un risque de rupture réduit et une durée de vie plus longue qu'un ressort de réglage rapide conventionnel. La présente invention concerne en particulier un dispositif dans lequel le mobile comprend une lunette tournante.The present invention relates to a device comprising a fast adjusting spring cooperating with a mobile of a timepiece, wherein the spring has a reduced risk of rupture and a longer life than a conventional quick-adjusting spring. The present invention relates in particular to a device in which the mobile comprises a rotating bezel.

Etat de la techniqueState of the art

Les montres dites "Greenwich Mean Time" (GMT) permettent l'affichage de l'heure d'un second fuseau horaire simultanément au premier. Dans la plupart des cas, cela est réalisé en positionnant une seconde aiguille des heures en dessous d'une première aiguille des heures. Une montre GMT comporte typiquement un dispositif d'embrayage élastique comprenant un ressort fuseau. Le ressort fuseau permet la mise à l'heure du second fuseau horaire, en déplaçant la seconde aiguille des heures (ou aiguille GMT) par sauts successifs d'une heure entière. La première aiguille des heures, celle des minutes et celle des secondes ne sont pas influencées par cette opération. La figure 4 montre un tel ressort fuseau 1 coopérant avec une étoile 4 à douze dents 41 reliée cinématiquement à l'aiguille GMT. Le ressort 1 comprend deux bras flexibles 21 et deux doigts 3 exerçant une force compressive sur les dents 41 de l'étoile 4. Lorsque les doigts 3 se déplacent entre un creux entre deux dents successives 41 et le sommet d'une des dents, les bras 21 sont sollicités en déformation.Watches called "Greenwich Mean Time" (GMT) allow the display of the time of a second time zone simultaneously to the first. In most cases, this is accomplished by positioning a second hour hand below a first hour hand. A GMT watch typically comprises an elastic clutch device comprising a spindle spring. The spindle spring allows the time setting of the second time zone, by moving the second hour hand (or GMT hand) in successive jumps of an entire hour. The first hour hand, the minute hand and the second hand are not influenced by this operation. The figure 4 shows such spring pin 1 cooperating with a star 4 to twelve teeth 41 kinematically connected to the GMT needle. The spring 1 comprises two flexible arms 21 and two fingers 3 exerting a compressive force on the teeth 41 of the star 4. When the fingers 3 move between a hollow between two successive teeth 41 and the top of one of the teeth, the arm 21 are biased.

Les ressorts fuseaux connus de ce type sont typiquement fabriqués dans un acier "maraging C300" ou "Durnico®" ou similaire. Ces ressorts fuseaux ont une durée de vie limitée, comprise entre 4 (élément en Durnico) et 20 ans (élément en Nivaflex). La durée de vie a un caractère aléatoire, dû notamment à la longueur importante des bras 21 et à leurs petites sections. Il est cependant difficile de réaliser un tel ressort avec des sections de bras plus grandes sans perdre les propriétés élastiques des bras, nécessaires au bon fonctionnement du ressort. Les techniques de fabrication à disposition imposent un rapport entre l'épaisseur et la largeur des bras à un rapport proche de 1.Known spindle springs of this type are typically made of "maraging C300" or "Durnico®" steel or the like. These Spindle springs have a limited life, ranging from 4 (element in Durnico) to 20 years (element in Nivaflex). The life is a random, due in particular to the length of the arms 21 and their small sections. However, it is difficult to make such a spring with larger arm sections without losing the elastic properties of the arms, necessary for the proper functioning of the spring. The available manufacturing techniques impose a ratio between the thickness and the width of the arms at a ratio close to 1.

La problématique décrite ci-dessus s'applique également à d'autres ressorts de réglage rapide utilisés dans un mouvement horloger, tel qu'un ressort de rappel de bascule, un ressort-cliquet, un doigt entraineur, ou un sautoir.The problem described above also applies to other quick adjustment springs used in a watch movement, such as a rocker spring, a ratchet spring, a driving finger, or a jumper.

Bref résumé de l'inventionBrief summary of the invention

Un but de la présente invention est de proposer un dispositif comportant un ressort de réglage rapide exempt des limitations des dispositif connus, notamment en termes de la liberté de design incluant son facteur de forme, son épaisseur et/ou sa largeur.An object of the present invention is to provide a device comprising a rapid adjustment spring free from the limitations of known devices, particularly in terms of freedom of design including its form factor, its thickness and / or its width.

Un autre but de l'invention est de fournir un dispositif comportant un ressort de réglage rapide de géométrie compacte et qui permet de réduire le risque de rupture et le caractère aléatoire de la rupture.Another object of the invention is to provide a device comprising a rapid adjustment spring of compact geometry and which reduces the risk of rupture and the random nature of the break.

Selon l'invention, ces buts sont atteints notamment au moyen d'un dispositif comportant un ressort de réglage rapide coopérant avec un mobile d'une pièce d'horlogerie, le ressort comprenant un doigt et une partie flexible, le doigt coopérant avec le mobile de sorte à être déplaçable selon un déplacement maximal par un mouvement du mobile et à exercer une force contre le mobile grâce à la flexion de la partie flexible; au moins la partie flexible du ressort étant fabriquée dans un alliage métallique amorphe, et dans lequel le dispositif coopère avec une lunette tournante.According to the invention, these objects are attained in particular by means of a device comprising a fast adjusting spring cooperating with a mobile of a timepiece, the spring comprising a finger and a flexible part, the finger cooperating with the mobile so as to be movable in a maximum displacement by a movement of the mobile and to exert a force against the mobile through the flexion of the flexible portion; at least the flexible portion of the spring being made of an amorphous metal alloy, and wherein the device cooperates with a rotating bezel.

Selon une forme d'exécution, l'alliage métallique amorphe dans lequel est réalisée au moins la partie flexible du ressort a un rapport de la limite élastique sur son module d'Young qui est au moins de 0.010, de préférence 0.015, et encore de préférence au moins 0.02.According to one embodiment, the amorphous metal alloy in which at least the flexible portion of the spring is made has a ratio of the elastic limit on its Young's modulus which is at least 0.010, preferably 0.015, and more than preferably at least 0.02.

Selon une autre forme d'exécution, le dimensionnement de la partie flexible limite le rapport de la contrainte maximale sur la limite élastique à 0.70 au maximum et de préférence 0.64 au maximum, lors du déplacement maximal du doigt. Par conséquent, les contraintes sur les facteurs de forme sont nettement moins sévères par rapport aux matériaux conventionnels.According to another embodiment, the dimensioning of the flexible portion limits the ratio of the maximum stress on the elastic limit to 0.70 at the maximum and preferably 0.64 at the maximum, during the maximum displacement of the finger. As a result, the constraints on the form factors are much less severe compared to conventional materials.

Brève description des figuresBrief description of the figures

Des exemples de mise en oeuvre de l'invention sont indiqués dans la description illustrée par les figures annexées dans lesquelles:

  • la figure 1 illustre un ressort de réglage rapide dans une première position, selon un mode de réalisation;
  • la figure 2 illustre le ressort de réglage rapide de la figure 1, dans une seconde position;
  • la figure 3 montre les déplacements et les contraintes dans le ressort de la figure 1, en position de repos et dans une position déformée;
  • la figure 4 représente un ressort de réglage rapide conventionnel;
  • la figure 5 montre les déplacements et les contraintes dans le ressort de la figure 4, en position de repos et dans une position déformée; et
  • la figure 6 illustre un dispositif dans lequel le ressort de réglage rapide utilisé en combinaison avec une lunette tournante, selon un mode de réalisation; et
  • la figure 7 illustre un mobile d'indexage et une bague à cliquet du dispositif de la figure 6.
Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:
  • the figure 1 illustrates a quick setting spring in a first position, according to one embodiment;
  • the figure 2 illustrates the quick-adjust spring of the figure 1 in a second position;
  • the figure 3 shows the displacements and stresses in the spring of the figure 1 in the rest position and in a deformed position;
  • the figure 4 represents a conventional rapid adjustment spring;
  • the figure 5 shows the displacements and stresses in the spring of the figure 4 in the rest position and in a deformed position; and
  • the figure 6 illustrates a device in which the quick adjustment spring used in combination with a rotating bezel, according to one embodiment; and
  • the figure 7 illustrates an indexing mobile and a ratchet ring of the device of the figure 6 .

Exemple(s) de mode de réalisation de l'inventionExample (s) of embodiment of the invention

Un ressort de réglage rapide 1 est illustré à la figure 1, selon un mode de réalisation. Le ressort 1 est destiné à fonctionner dans un dispositif d'embrayage élastique d'un affichage secondaire indiquant l'heure du fuseau horaire (non représenté), par exemple en déplaçant une aiguille (également non représentée) par sauts successifs d'une heure entière.A quick-adjust spring 1 is shown at figure 1 according to one embodiment. The spring 1 is intended to operate in an elastic clutch device of a secondary display indicating the time zone time (not shown), for example by moving a needle (also not shown) in successive jumps of a whole hour .

Le ressort 1 comprend une partie flexible 2 comportant deux bras flexibles 21, chacun ayant une forme d'arc de sorte que les deux bras forment une géométrie continue et fermée sur elle-méme. Chacun des bras 21 se termine par un doigt 3 arrangé pour coopérer avec les dents 41 d'une étoile 4 à douze dents 41. Dans la figure 1, une roue des heures 6 est également représentée. Dans cette configuration, la roue des heures 6 est typiquement entraînée par une minuterie (non représentée) et entraîne elle-méme l'étoile 4 en rotation. En particulier, le doigt 3 comprend une saillie 31 qui vient se loger dans un creux entre deux dents successives 41 de l'étoile à douze dents 41. Les bras 3 exercent une force compressive sur les dents 41 de l'étoile 4. Lorsque l'étoile 4 tourne, les saillies 31 des doigts 3 du ressort 1 s'écartent de leur position de repos dans un creux entre deux dents 41 de l'étoile 4 et tombent dans le creux immédiatement suivant sous l'effet de leur élasticité et de la force compressive exercée par la partie flexible 2. Le ressort 1 permet donc de définir douze positions stables pour l'aiguille des heures secondaire.The spring 1 comprises a flexible portion 2 having two flexible arms 21, each having an arc shape so that the two arms form a continuous geometry and closed on itself. Each of the arms 21 ends with a finger 3 arranged to cooperate with the teeth 41 of a star 4 to twelve teeth 41. figure 1 an hour wheel 6 is also shown. In this configuration, the hour wheel 6 is typically driven by a timer (not shown) and itself drives the star 4 in rotation. In particular, the finger 3 comprises a projection 31 which is housed in a hollow between two successive teeth 41 of the star with twelve teeth 41. The arms 3 exert a compressive force on the teeth 41 of the star 4. When the 4 star rotates, the projections 31 of the fingers 3 of the spring 1 deviate from their rest position in a hollow between two teeth 41 of the star 4 and fall into the immediately following hollow under the effect of their elasticity and the compressive force exerted by the flexible portion 2. The spring 1 thus makes it possible to define twelve stable positions for the secondary hour hand.

Dans l'exemple de la figure 1, les deux bras 21 sont sensiblement symétriques de sorte que les deux doigts 3 sont arrangés diamétralement opposés, chacune des doigts 3 exerçant une force de rappel vers l'axe 42 de pivotement de l'étoile 4. La configuration des bras 21 permet à chacune des doigts 3 d'exercer une force symétrique vers l'axe de pivotement 42 de l'étoile 4.In the example of the figure 1 , the two arms 21 are substantially symmetrical so that the two fingers 3 are arranged diametrically opposed, each of the fingers 3 exerting a restoring force towards the axis 42 of pivoting of the star 4. The configuration of the arms 21 allows each fingers 3 to exert a symmetrical force towards the pivot axis 42 of the star 4.

Le déplacement maximal du doigt 3 correspond à l'écartement du doigt 3 entre une première position du ressort 1 où chacun des doigts 3 sont dans un creux entre deux dents 41 et une seconde position du ressort 1 où les doigts 3 sont chacun sur le sommet d'une des dents 41. Le déplacement maximal du doigt 3 correspond donc généralement à la hauteur des dents 41. La déformation du doigt et du ressort peut être plus grand s'il y a un préarmage au repos afin de garantir la tenue aux chocs de l'aiguille ou l'indicateur associé à l'étoile 4.The maximum displacement of the finger 3 corresponds to the spacing of the finger 3 between a first position of the spring 1 where each of the fingers 3 are in a hollow between two teeth 41 and a second position of the spring 1 where the fingers 3 are each on the top of a tooth 41. The maximum displacement of the finger 3 therefore corresponds generally to the height of the teeth 41. The deformation of the finger and the spring may be greater if there is pre-arming at rest to ensure the shock resistance of the needle or the indicator associated with star 4.

La figure 1 montre le ressort dans la première position. Dans la figure 2, le ressort est représenté dans la seconde position.The figure 1 shows the spring in the first position. In the figure 2 the spring is shown in the second position.

Chacun des doigts 3 peut comporter un téton 8 pouvant coulisser dans une ouverture oblongue (pas visible) pratiqué dans un autre composant (comme le moyeu de la roue des heures 6) et apte à recevoir le téton 8. Les ouvertures oblongues permettent de guider les doigts 3 et de leur imposer un positionnement précis. Les ouvertures oblongues peuvent également être de forme rectangulaire ou toute autre forme appropriée.Each of the fingers 3 may comprise a pin 8 slidable in an oblong opening (not visible) made in another component (as the hub of the hour wheel 6) and adapted to receive the pin 8. The oblong openings allow to guide the fingers 3 and impose them a precise positioning. The oblong openings may also be of rectangular shape or any other suitable form.

Dans un mode de réalisation, au moins la partie flexible 2 du ressort 1 est fabriquée dans un alliage métallique amorphe ayant un rapport de la contrainte de limite élastique σlim sur son module d'Young qui est au moins 0.010, de préférence 0.015, et encore préférence au moins 0.02. Un tel rapport permet d'optimiser la géométrie de la partie flexible 2 de manière à ce que le rapport σmax/σlim de la contrainte maximale σmax lors d'un déplacement maximal du doigt 3 sur la contrainte de limite élastique σlim, correspondant à la limite d'élasticité soit 0.70 au maximum et de préférence 0.64 au maximum.In one embodiment, at least the flexible portion 2 of the spring 1 is made of an amorphous metal alloy having a ratio of the elastic limit stress σ lim on its Young's modulus which is at least 0.010, preferably 0.015, and still preferably at least 0.02. Such a ratio makes it possible to optimize the geometry of the flexible part 2 so that the ratio σ max / σ lim of the maximum stress σ max during a maximum displacement of the finger 3 on the elastic limit stress σ lim , corresponding to the elastic limit of 0.70 maximum and preferably 0.64 maximum.

Selon une forme d'exécution, l'ensemble du ressort 1 est fabriqué dans l'alliage métallique amorphe massif. De manière préférée, l'alliage métallique amorphe est choisi parmi un groupe comprenant un verre métallique.According to one embodiment, the assembly of the spring 1 is manufactured in the massive amorphous metal alloy. Preferably, the amorphous metal alloy is selected from a group comprising a metal glass.

Les verres métalliques n'ont pas une structure cristallographique précise et sont dans un état appelé vitreux. Ceci leur procure des propriétés tout à fait particulières. D'un point de vue mécanique, les phénomènes de déformation et rupture connus dans les métaux cristallins n'ont plus lieu d'être. Il a également été montré que la stabilité chimique des alliages amorphes massifs est supérieure à celle des alliages conventionnels.The metallic glasses do not have a precise crystallographic structure and are in a vitreous state. This gives them very particular properties. From a mechanical point of view, the phenomena of deformation and rupture known in crystalline metals are no longer necessary. It has also been shown that the chemical stability of solid amorphous alloys is superior to that of conventional alloys.

Les verres métalliques présentent un module de Young relativement bas. Par exemple le module de Young d'un verre métallique est environ deux plus faible que celui d'un alliage tel que l'acier X2NiCoMo 18-9-5 connu sous la dénomination "maraging C300" ou "Durnico®" tout en ayant une limite à la rupture substantiellement équivalent à celle du Durnico. Le Durnico est typiquement utilisé en horlogerie pour la fabrication de pièces compliquées présentant des propriétés ressorts et une résistance à la fatigue élevées.The metallic glasses have a relatively low Young's modulus. For example, the Young's modulus of a metal glass is about two times lower than that of an alloy such as X2NiCoMo 18-9-5 steel known under the name "maraging C300" or "Durnico®" while having a limit at break substantially equivalent to that of Durnico. The Durnico is typically used in watchmaking for the manufacture of complicated parts with high spring properties and fatigue resistance.

Un ressort en verre métallique aura une élongation à la rupture environ deux fois plus importante que pour un même ressort en Durnico. Il est donc possible d'exploiter un ressort en verre métallique sur une plage de déformation plus importante.A metal glass spring will have an elongation at break approximately twice as large as for the same Durnico spring. It is therefore possible to operate a metal glass spring over a larger deformation range.

La figure 3 représente le ressort 1 montrant des simulations des déplacements des bras 21 et des doigts 3 du ressort 1, ainsi que des contraintes subies par les différentes parties du ressort 1. Les déplacements et les contraintes simulés sont montrés pour le ressort 1 dans la seconde position, c'est-à-dire lorsque les doigts 3 sont chacun au sommet d'une des dents 41. Dans l'exemple de la figure 3, le ressort 1 est fabriqué dans un verre métallique à base de zircone, Zr (Zr-BMG) caractérisé par une densité de 6830 kg/m3, une contrainte de limite élastique σlim de 1620 N/mm2 et un module de Young de 81000 N/mm2. L'alliage Zr-BMG peut comprendre le cuivre, le nickel et l'aluminium également.The figure 3 represents the spring 1 showing simulations of the displacements of the arms 21 and the fingers 3 of the spring 1, as well as the stresses undergone by the different parts of the spring 1. The displacements and the simulated stresses are shown for the spring 1 in the second position, that is to say when the fingers 3 are each at the top of one of the teeth 41. In the example of the figure 3 , the spring 1 is made of zirconia-based metal glass, Zr (Zr-BMG) characterized by a density of 6830 kg / m 3 , an elastic limit stress σ lim of 1620 N / mm 2 and a Young's modulus of 81000 N / mm 2 . The Zr-BMG alloy can include copper, nickel and aluminum as well.

Le déplacement maximal de chacun des bras 21, entre la première position et la seconde position du ressort 1, est de 0.26 mm (au milieu de la longueur du bras 21). Le déplacement maximal de chacun des doigts 3, entre la première position et la seconde position du ressort 1, est de 0.19 mm. La contrainte maximale σmax calculée dans ces conditions est comprise entre 1028 N/mm2 et 1032 N/mm2 ce qui résulte dans un rapport σmax/σlim de 0.64. Aucun vieillissement par fatigue n'a été constaté par les inventeurs après 107 cycles de déplacement maximal des doigts 3. La seule rupture observée a été attribuée à des phénomènes d'usure causés par le frottement entre le ressort 1 et l'étoile 4.The maximum displacement of each of the arms 21, between the first position and the second position of the spring 1, is 0.26 mm (at the middle of the length of the arm 21). The maximum displacement of each of the fingers 3, between the first position and the second position of the spring 1, is 0.19 mm. The maximum stress σ max calculated under these conditions is between 1028 N / mm 2 and 1032 N / mm 2 which results in a ratio σ max / σ lim of 0.64. No fatigue aging was found by the inventors after 10 7 Maximum displacement cycles fingers 3. The only failure observed was attributed to phenomena of wear caused by friction between the spring 1 and 4 star.

La figure 4 montre un ressort fuseau 1 conventionnel réalisé dans l'alliage Durnico®, coopérant avec une étoile 4 à douze dents 41. Le ressort 1 est représenté (en noir) dans une position où chacun des doigts 3 sont dans un creux entre deux dents 41 et est représenté (en filaire) dans une position où chacun des doigts 3 sont sur le sommet d'une des dents 41. La figure 5 représente le même type de simulations réalisées pour le ressort de la figure 3. L'alliage Durnico® est caractérisé par une densité de 8.1 g/cm3, une contrainte de limite élastique σlim entre 1800 N/mm2 et 2200 N/mm2 et un module de Young de 195000 N/mm2.The figure 4 shows a conventional spindle spring 1 made in Durnico® alloy, cooperating with a star 4 to twelve teeth 41. The spring 1 is shown (in black) in a position where each of the fingers 3 are in a hollow between two teeth 41 and is shown (in wire) in a position where each of the fingers 3 are on the top of one of the teeth 41. figure 5 represents the same type of simulations performed for the spring of the figure 3 . Durnico® alloy is characterized by a density of 8.1 g / cm 3 , an elastic limit stress σ lim between 1800 N / mm 2 and 2200 N / mm 2 and a Young's modulus of 195000 N / mm 2 .

On remarque que la contrainte de limite élastique σlim du Durnico est similaire à celle du verre métallique Zr-BMG mais son module de Young est environ deux fois plus élevé. Afin d'accommoder les mêmes déformations que le ressort 1 en verre métallique tout en restant dans le domaine élastique, par exemple un déplacement maximal de chacun des doigts de l'ordre de 0.19 mm, les bras flexibles 21 devront être plus longs lorsque le ressort 1 est fabriqué en Durnico. On remarque les bras 21 plus long dans la géométrie du ressort 1 de la figure 4 ainsi que le repliement des bras plus marqué.Note that the elastic limit stress σ lim of the Durnico is similar to that of the metal glass Zr-BMG but its Young's modulus is about twice as high. In order to accommodate the same deformations as the spring 1 of metal glass while remaining in the elastic range, for example a maximum displacement of each of the fingers of the order of 0.19 mm, the flexible arms 21 must be longer when the spring 1 is manufactured in Durnico. We notice the arms 21 longer in the geometry of the spring 1 of the figure 4 as well as the folding of the arms more marked.

Dans le cas du ressort 1 de la figure 4 et pour un déplacement maximal du doigt 3 de 0.19 mm, la contrainte maximale σmax calculée est comprise entre 1681 N/mm2 et 1718 N/mm2, ce qui résulte dans un rapport σmax/σlim de 0.95 pour un module de Young de 1800 N/mm2 et de 0.78 pour un module de Young de 2200 N/mm2. De telles valeurs pour le rapport σmax/σlim sont élevées, rendant le ressort sensible à la fatigue oligocyclique.In the case of spring 1 of the figure 4 and for a maximum displacement of the finger 3 of 0.19 mm, the maximum stress σ max calculated is between 1681 N / mm 2 and 1718 N / mm 2 , which results in a ratio σ max / σ lim of 0.95 for a module of Young of 1800 N / mm 2 and 0.78 for a Young's modulus of 2200 N / mm 2 . Such values for the ratio σ max / σ lim are high, making the spring sensitive to oligocyclic fatigue.

On comprend de la comparaison des géométries de ressort des figures 3 et 4 ainsi que des rapports σmax/σlim que l'utilisation d'un verre métallique pour la fabrication du ressort 1 permet une géométrie du ressort 1 plus compacte (par exemple des bras 21 plus courts) tout en réduisant les concentrations de contraintes, autrement dit en ayant un rapport σmax/σlim plus faible que dans le cas d'alliages conventionnels. Par rapport à un ressort dans un alliage conventionnel, le ressort 1 en verre métallique permet de réduire l'encombrement et est plus sécuritaire, c'est-à-dire que les valeurs de contrainte maximale σmax sont plus éloignées que la valeur de la contrainte de limite élastique σlim (rapport σmax/σlim plus faible).We understand the comparison of the spring geometries of Figures 3 and 4 as well as ratios σ max / σ lim that the use of a metal lens for the manufacture of the spring 1 allows a more compact geometry of the spring 1 (for example shorter arms 21) while reducing the stress concentrations, otherwise said having a ratio σ max / σ lim lower than in the case of conventional alloys. Compared to a spring in a conventional alloy, the spring 1 made of metal glass makes it possible to reduce the bulk and is safer, that is to say that the maximum stress values σ max are more distant than the value of the elastic limit stress σ lim (ratio σ max / σ lim lower).

Les verres métalliques ayant un module de Young plus petit que pour les alliages couramment utilisés pour les applications horlogères, mais une limite à la rupture semblable à ces alliages permet d'exploiter le ressort en verre métallique sur une plus large plage de déformation (l'élongation à la rupture est d'environ deux fois plus importante que pour le Durnico).The metallic glasses having a Young's modulus smaller than for the alloys commonly used for horological applications, but a similar limit of rupture to these alloys makes it possible to exploit the metal glass spring over a wider range of deformation (the elongation at break is about twice as large as for the Durnico).

Les propriétés des verres métalliques autorisent l'adoption d'une géométrie du ressort qui est plus compacte et qui permet de réduire les concentrations de contraintes. Les contraintes sont réparties d'une manière plus homogène dans le ressort et le verre métallique travaille dans un domaine plus éloigné de la limite élastique, diminuant ainsi le risque de rupture et le caractère aléatoire de la rupture.The properties of metal lenses allow the adoption of a spring geometry that is more compact and reduces stress concentrations. The stresses are distributed in a more homogeneous way in the spring and the metallic glass works in a field more distant from the elastic limit, thus reducing the risk of rupture and the random nature of the rupture.

Le ressort 1 en verre métallique a également une meilleure résistance à la fatigue, une sensibilité réduite à la corrosion, et un coefficient de friction réduit par rapport à un ressort fabriqué dans un alliage conventionnel. Le facteur de forme autorisé par l'utilisation de ce matériau est également de premier intérêt.The metal glass spring 1 also has improved fatigue strength, reduced sensitivity to corrosion, and a reduced coefficient of friction compared to a spring made of a conventional alloy. The form factor allowed by the use of this material is also of primary interest.

La description ci-dessus décrit un ressort fuseau pour un embrayage élastique d'un affichage secondaire indiquant l'heure du fuseau horaire. Cependant, l'invention n'est pas limitée à un tel ressort mais s'applique également à tout type de ressort de réglage rapide et/ou élément élastique destiné à fonctionner dans un mouvement horloger.The above description describes a spindle spring for an elastic clutch of a secondary display indicating the time of the time zone. However, the invention is not limited to such a spring but also applies to any type of quick adjustment spring and / or elastic member intended to operate in a watch movement.

Par exemple, le ressort en verre métallique de l'invention peut être un ressort de réglage rapide de l'heure, un ressort de rappel de bascule, un ressort-cliquet, un doigt entraineur, ou un sautoir tel qu'un sautoir de tirette ou un sautoir de réglages de calendrier.For example, the metal-glass spring of the invention may be a quick-setting spring, a rocker spring, a ratchet spring, a driving finger, or a jumper such as a pull-cord or a jumper of calendar settings.

L'alliage métallique amorphe massif, ou le verre métallique, peut être mis en forme en partant d'un alliage liquide. Pour certains alliages, la solidification est alors effectuée avec une vitesse de refroidissement très importante afin d'éviter la cristallisation de la matière, mais une telle vitesse importante limite fortement l'épaisseur maximale qu'il est possible d'atteindre.The solid amorphous metal alloy, or the metallic glass, can be shaped starting from a liquid alloy. For some alloys, the solidification is then carried out with a very high cooling rate in order to avoid the crystallization of the material, but such a high speed greatly limits the maximum thickness that can be achieved.

Certains alliages métalliques amorphes massifs peuvent être refroidis à des vitesses nettement plus faibles, tout en conservant une structure amorphe. Ces alliages métalliques amorphes permettent l'utilisation d'une gamme beaucoup plus large de procédés de mise en forme. Par exemple, ces alliages permettent de fabriquer des pièces en verre métallique massif par injection, permettant ainsi d'obtenir des tolérances de forme plus précises que par un étampage classique.Some massive amorphous metal alloys can be cooled at significantly lower speeds while maintaining an amorphous structure. These amorphous metal alloys allow the use of a much wider range of forming processes. For example, these alloys make it possible to manufacture solid metal glass parts by injection, thus making it possible to obtain more precise shape tolerances than by conventional stamping.

Ces alliages possèdent également une phase amorphe nettement plus stable, ce qui permet d'effectuer diverses opérations de reprise sur les pièces, sans que la matière ne se recristallise. Ainsi, tous types de finitions (par exemple, le polissage ou le satinage) peuvent être appliqués. Il est ainsi possible de rectifier des trous, des faces ainsi que de tarauder des trous. A titre d'exemple, une méthode de gravure laser a été développée afin de répondre aux besoins des applications industrielles.These alloys also have a much more stable amorphous phase, which makes it possible to carry out various rework operations on the parts, without the material recrystallising. Thus, all types of finishes (for example, polishing or satin finishing) can be applied. It is thus possible to grind holes, faces and tapping holes. For example, a laser engraving method has been developed to meet the needs of industrial applications.

Les procédés d'injection des verres métalliques requièrent des moules en de cuivre ou silicium afin de garantir un refroidissement efficace. Les épaisseurs des pièces fabriquées sont limitées à quelques millimètres afin d'extraire suffisamment de chaleur et permettre un refroidissement suffisamment rapide.Metal glass injection processes require copper or silicon molds to ensure efficient cooling. The thicknesses of the manufactured parts are limited to a few millimeters in order to extract enough heat and to allow a sufficiently fast cooling.

Encore selon un autre mode de réalisation illustré à la figure 6, le ressort de réglage rapide 1 peut être utilisé en combinaison avec une lunette tournante 5 mobile en rotation et indexable en rotation, par rapport à un composant de carrure 7 d'une pièce d'horlogerie.Still according to another embodiment illustrated in figure 6 , the quick-adjusting spring 1 can be used in combination with a rotatable bezel 5 rotatable and indexable in rotation, relative to a middle component 7 of a timepiece.

Un mobile d'indexage (ou bague dentée) 4 comporte une denture intérieure 41. Le mobile d'indexage est destiné à être placé fixe dans le composant de carrure 7. Le ressort de réglage rapide comprend une bague à cliquet 50 comportant plusieurs lamelles élastiques 2 ayant chacune une extrémité solidaire de la bague 50 et l'autre extrémité libre. Le mobile d'indexage 4 et la bague 50 sont montrés de manière isolée à la figure 7.An indexing mobile (or toothed ring) 4 has an internal toothing 41. The indexing mobile is intended to be fixedly placed in the middle part component 7. The quick adjustment spring comprises a ratchet ring 50 comprising a plurality of elastic strips 2 each having one end secured to the ring 50 and the other free end. The indexing mobile 4 and the ring 50 are shown in isolation at the figure 7 .

Les lamelles élastiques 2 s'étendent dans des évidements 51 que comporte la bague 50. L'extrémité libre de chaque lamelle élastique 2 comporte un doigt 3 dont la forme est adaptée à coopérer avec les dents de la denture 41 du mobile d'indexage 4. Dans l'ensemble illustré, la bague à cliquet 50 comporte trois lamelles élastiques 2.The resilient lamellae 2 extend in recesses 51 that the ring 50 comprises. The free end of each elastic lamella 2 comprises a finger 3 whose shape is adapted to cooperate with the teeth of the toothing 41 of the indexing mobile 4 In the assembly illustrated, the ratchet ring 50 comprises three elastic strips 2.

La bague à cliquet 50 est arrangée pour venir s'assembler de manière fixe avec la lunette 5 et le mobile d'indexage 4 s'assembler fixe au composant de carrure 7. Lorsque bague à cliquet 50 et le mobile d'indexage 4 sont assemblés, le doigt 3 des lamelles élastiques 2 vient coopérer avec les dents de la denture 41 du mobile d'indexage 4, permettant ainsi d'indexer angulairement la lunette tournante 5 sur le composant de carrure 7. Le déplacement maximal du doigt 3 est déterminé par le profil de la denture 41.The ratchet ring 50 is arranged to come together in a fixed manner with the bezel 5 and the indexing unit 4 to be fixedly assembled to the middle part component 7. When the ratchet ring 50 and the indexing unit 4 are assembled the finger 3 of the resilient lamellae 2 cooperates with the teeth of the toothing 41 of the indexing wheel 4, thus making it possible to angularly index the rotating bezel 5 on the middle part component 7. The maximum displacement of the finger 3 is determined by the profile of the teeth 41.

La configuration de la bague à cliquet 50 comportant les lamelles élastiques 2 décrite ci-dessus est adaptée pour des applications d'indexation angulaire dans une direction unique de rotation (par exemple une lunette). Dans le cas d'une application bidirectionnelle, par exemple pour une lunette GMT ou autre, les lamelles élastiques 2 peuvent avoir une géométrie fermée. Par exemple, les deux extrémités de la lamelle élastique peuvent être fixées (solidaire) de la bague à cliquet 50 et le doigt 3 arrangé de façon à ce que la lamelle élastique 2 est de part et d'autre du doigt 3. Le doigt 3 peut correspondre au sommet de la lamelle élastique 2 convexe par rapport au diamètre intérieur de la bague à cliquet 50.The configuration of the ratchet ring 50 comprising the elastic strips 2 described above is suitable for angular indexing applications in a single direction of rotation (for example a telescope). In the case of bidirectional application, for example for a GMT or other telescope, the elastic strips 2 may have a closed geometry. For example, the two ends of the elastic strip can be fixed (secured) to the ratchet ring 50 and the finger 3 arranged so that the elastic strip 2 is on either side of the finger 3. The finger 3 may correspond to the top of the elastic strip 2 convex relative to the inner diameter of the ratchet ring 50.

Selon une autre forme d'exécution non illustrée, la bague à cliquet 50 peut comprendre une lame élastique sensiblement annulaire sur laquelle est monté un ou plusieurs doigts 3 (pouvant prendre la forme d'un galet). Le mobile d'indexage 4 peut alors comprendre une denture 41 comportant un profil continu (par exemple un profil de forme sinusoïdale).According to another embodiment not illustrated, the ratchet ring 50 may comprise a substantially annular elastic blade on which is mounted one or more fingers 3 (which may take the form of a roller). The indexing mobile 4 can then comprise a toothing 41 having a continuous profile (for example a profile of sinusoidal shape).

L'arrangement de la lamelle élastique 2 et du doigt 3 par rapport à la denture 41 du mobile d'indexage 4 peut être tel que le doigt 3 exerce une pression de manière radiale sur la denture 41, axiale ou en partie radiale et axiale. Les figures 6 et 7 montrent un exemple où le doigt 3 exerce une pression de manière radiale sur la denture 41. Un exemple du doigt 3 exerçant une pression de manière axiale sur la denture 41 pourrait correspondre à une configuration où le doigt 3 (et la lamelle élastique 2) exerce une pression dans une direction sensiblement perpendiculaire à l'axe de rotation de la lunette 5.The arrangement of the elastic blade 2 and the finger 3 relative to the toothing 41 of the indexing mobile 4 may be such that the finger 3 exerts a pressure radially on the toothing 41, axial or partly radial and axial. The figures 6 and 7 show an example where the finger 3 exerts a pressure radially on the toothing 41. An example of the finger 3 exerting a pressure axially on the toothing 41 could correspond to a configuration where the finger 3 (and the elastic strip 2) exerts a pressure in a direction substantially perpendicular to the axis of rotation of the telescope 5.

Au moins la lamelle élastique 2 est réalisée dans un alliage métallique amorphe, par exemple comprenant un verre métallique. La lamelle élastique 2 peut être formée intégrale avec la bague à cliquet 50. Alternativement, la lamelle élastique 2 peut être séparée de la bague à cliquet 50 ou montée de manière articulée sur la bague à cliquet 50.At least the elastic lamella 2 is made of an amorphous metal alloy, for example comprising a metal glass. The elastic strip 2 may be integrally formed with the ratchet ring 50. Alternatively, the elastic strip 2 may be separated from the ratchet ring 50 or mounted in an articulated manner on the ratchet ring 50.

L'alliage métallique amorphe dans lequel est réalisée au moins la lamelle élastique 2 a un rapport de la limite élastique (σlim) sur son module d'Young d'au moins 0.010, de préférence d'au moins 0.02 et encore de préférence, d'au moins 0.015.The amorphous metal alloy in which at least the elastic lamella 2 is made has a ratio of the elastic limit (σ lim ) on its Young's modulus of at least 0.010, preferably at least 0.02 and more preferably at least 0.015.

Le dimensionnement de la lamelle élastique 2 limite le rapport de la contrainte maximale σmax sur la limite élastique σlim à 0.70 au maximum, de préférence 0.64 au maximum, lors du déplacement du doigt 3 sur le mobile d'indexage 4.The design of the elastic lamella 2 limits the ratio of the maximum stress σ max to the elastic limit σ lim to 0.70 at most, preferably 0.64 to the maximum, during the displacement of the finger 3 on the indexing wheel 4.

L'alliage métallique amorphe permet d'obtenir des propriétés élastiques favorables et un encombrement limité du ressort de réglage rapide 1. L'alliage métallique amorphe permet également d'obtenir de bonnes propriétés tribologiques pour au moins la lamelle élastique 2 et de limiter l'usure, et donc la résistance dans le temps, du dispositif comportant le ressort de réglage rapide 1 et le mobile d'indexage 4.The amorphous metal alloy makes it possible to obtain favorable elastic properties and a limited bulk of the quick adjustment spring 1. The amorphous metal alloy also makes it possible to obtain good tribological properties for at least the elastic strip 2 and to limit the wear, and therefore the resistance in time, of the device comprising the quick adjustment spring 1 and the indexing mobile 4.

Numéros de référence employés sur les figuresReference numbers used in the figures

11
ressort de réglage rapidequick adjustment spring
22
partie flexible, lamelles élastiquesflexible part, elastic slats
2121
brasarms
33
doigtfinger
3131
saillieprojection
44
étoile, mobile d'indexagestar, mobile indexing
4141
dent, denturetooth, toothing
4242
axeaxis
55
lunetteglasses
5050
bague à cliquetratchet ring
5151
évidementrecess
66
roue des heureshour wheel
77
composant de carruremiddle part
88
tétonstud
σlim σ lim
contrainte de limite élastiqueelastic limit stress
σmax σ max
contrainte maximalemaximum stress

Claims (11)

Dispositif comportant un ressort de réglage rapide (1) coopérant avec un mobile (4) d'une pièce d'horlogerie, le ressort (1) comprenant une partie flexible (2) comportant un doigt (3) et le doigt (3) coopérant avec le mobile (4) de sorte à être déplaçable selon un déplacement maximal par un mouvement du mobile (4) et à exercer une force contre le mobile (4), grâce à la flexion de la partie flexible (2);
dans lequel au moins la partie flexible (2) du ressort étant réalisée dans un alliage métallique amorphe; et
dans lequel le dispositif coopère avec une lunette tournante (4).Device comprising a fast adjusting spring (1) cooperating with a mobile (4) of a timepiece, the spring (1) comprising a flexible part (2) comprising a finger (3) and the finger (3) cooperating with the mobile (4) so as to be movable in a maximum displacement by a movement of the mobile (4) and to exert a force against the mobile (4), thanks to the flexion of the flexible part (2);
wherein at least the flexible portion (2) of the spring is made of an amorphous metal alloy; and
wherein the device cooperates with a rotating bezel (4). Le dispositif selon la revendication précédente dans lequel l'alliage métallique amorphe dans lequel est réalisée au moins la partie flexible (2) du ressort (1) a un rapport de la limite élastique (σlim) sur son module d'Young d'au moins 0.010, de préférence d'au moins 0.015 et encore de préférence, d'au moins 0.020.The device according to the preceding claim wherein the amorphous metal alloy in which is made at least the flexible portion (2) of the spring (1) has a ratio of the elastic limit (σ lim ) on its Young's modulus of less 0.010, preferably at least 0.015 and more preferably at least 0.020. Le dispositif selon l'une des revendications précédentes,
dans lequel le dimensionnement de la partie flexible (2) limite le rapport de la contrainte maximale (σmax) sur la limite élastique (σlim) à 0.70 au maximum, de préférence 0.64 au maximum, lors du déplacement du doigt (3) sur le mobile (4).The device according to one of the preceding claims,
in which the dimensioning of the flexible part (2) limits the ratio of the maximum stress (σ max ) to the elastic limit (σ lim ) to 0.70 at most, preferably 0.64 to the maximum, when the finger (3) is moved on the mobile (4). Le dispositif selon l'une des revendications précédentes,
dans lequel l'alliage métallique amorphe comprend un verre métallique.The device according to one of the preceding claims,
wherein the amorphous metal alloy comprises a metallic glass. Le dispositif selon l'une des revendications précédentes,
dans lequel le mobile comprend un mobile d'indexage (4) comprenant une denture (41); le déplacement maximal du doigt (3) étant déterminé par le profil de la denture (41).The device according to one of the preceding claims,
wherein the mobile comprises an indexing mobile (4) comprising a toothing (41); the maximum displacement of the finger (3) being determined by the profile of the toothing (41). Le dispositif selon la revendication 5,
dans lequel le ressort (1) comprend bague à cliquet (50) comportant au moins une partie flexible (2) ayant une extrémité solidaire de la bague (50); la bague à cliquet (50) étant solidaire de la lunette (5) et le mobile d'indexage (4) étant destiné à être solidaire à un composant de carrure (7) de la pièce d'horlogerie.The device according to claim 5,
wherein the spring (1) comprises a ratchet ring (50) having at least one flexible portion (2) having an end integral with the ring (50); the ratchet ring (50) being integral with the bezel (5) and the indexing mobile (4) being intended to be integral with a middle component (7) of the timepiece. Le dispositif selon la revendication 5 ou 6,
dans lequel l'autre extrémité de la partie flexible (2) est libre; et
dans lequel le ressort (1) est destiné à des applications d'indexation angulaire unidirectionnelle de la lunette (5).The device according to claim 5 or 6,
wherein the other end of the flexible portion (2) is free; and
in which the spring (1) is intended for unidirectional angular indexing applications of the telescope (5). Le dispositif selon la revendication 5 ou 6,
dans lequel l'autre extrémité de la partie flexible (2) est également solidaire de la bague à cliquet (50); et
dans lequel le ressort (1) est destiné à des applications d'indexation angulaire bidirectionnelle de la lunette (5).The device according to claim 5 or 6,
wherein the other end of the flexible portion (2) is also integral with the ratchet ring (50); and
wherein the spring (1) is intended for bidirectional angular indexing applications of the telescope (5). Le dispositif selon la revendication 8,
dans lequel la partie flexible (2) forme une géométrie continue et fermée sur elle-méme.The device according to claim 8,
wherein the flexible portion (2) forms a continuous geometry and closed on itself. Le dispositif selon l'une des revendications 5 à 9,
dans lequel la partie flexible (2) et le doigt (3) sont arrangés par rapport à la denture (41) de sorte que le doigt (3) exerce une pression de manière radiale, axiale ou en partie radiale et axiale, sur la denture (41).The device according to one of claims 5 to 9,
wherein the flexible portion (2) and the finger (3) are arranged with respect to the toothing (41) so that the finger (3) exerts pressure radially, axially or partly radially and axially on the toothing (41). Mouvement horloger comprenant un dispositif selon l'une des revendications 1 à 10.Clock movement comprising a device according to one of claims 1 to 10.
EP17162423.2A 2017-03-22 2017-03-22 Device comprising a quick-adjustment spring engaging with a mobile of a timepiece Active EP3379342B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17162423.2A EP3379342B1 (en) 2017-03-22 2017-03-22 Device comprising a quick-adjustment spring engaging with a mobile of a timepiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17162423.2A EP3379342B1 (en) 2017-03-22 2017-03-22 Device comprising a quick-adjustment spring engaging with a mobile of a timepiece

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EP3379342A1 true EP3379342A1 (en) 2018-09-26
EP3379342B1 EP3379342B1 (en) 2022-07-20

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH716774A1 (en) * 2019-11-06 2021-05-14 Officine Panerai Ag Clockwork coupling and indexing device.
EP4020098A1 (en) 2020-12-22 2022-06-29 Rolex Sa Spring for notching system and timepiece notching system
EP4020097A1 (en) 2020-12-22 2022-06-29 Rolex Sa Spring for notching system and timepiece notching system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1041460A1 (en) * 1998-09-22 2000-10-04 Seiko Epson Corporation Rotating bezel mounting structure and timepiece with the mounting structure
EP1271268A1 (en) * 2001-06-28 2003-01-02 Conseils et Manufactures VLG SA Timepiece with two time zones
WO2013102598A2 (en) * 2011-12-27 2013-07-11 Rolex S.A. Spring for clock movement
EP2905661A1 (en) * 2014-02-10 2015-08-12 Rolex Sa Rotating bezel of a watch case

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5127279B2 (en) * 2006-04-12 2013-01-23 王鼎精密股▲ふん▼有限公司 Clock assembly with world time zone display
EP2113759A1 (en) * 2008-04-29 2009-11-04 The Swatch Group Research and Development Ltd. Pressure sensor having a membrane comprising an amorphous material
EP2703911B1 (en) * 2012-09-03 2018-04-11 Blancpain SA. Regulating element for watch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1041460A1 (en) * 1998-09-22 2000-10-04 Seiko Epson Corporation Rotating bezel mounting structure and timepiece with the mounting structure
EP1271268A1 (en) * 2001-06-28 2003-01-02 Conseils et Manufactures VLG SA Timepiece with two time zones
WO2013102598A2 (en) * 2011-12-27 2013-07-11 Rolex S.A. Spring for clock movement
EP2905661A1 (en) * 2014-02-10 2015-08-12 Rolex Sa Rotating bezel of a watch case

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH716774A1 (en) * 2019-11-06 2021-05-14 Officine Panerai Ag Clockwork coupling and indexing device.
EP4020098A1 (en) 2020-12-22 2022-06-29 Rolex Sa Spring for notching system and timepiece notching system
EP4020097A1 (en) 2020-12-22 2022-06-29 Rolex Sa Spring for notching system and timepiece notching system
US11977355B2 (en) 2020-12-22 2024-05-07 Rolex Sa Spring for a notching system and timepiece notching system

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