EP2677369B1 - High frequency balance wheel for timepiece - Google Patents

High frequency balance wheel for timepiece Download PDF

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Publication number
EP2677369B1
EP2677369B1 EP13184692.5A EP13184692A EP2677369B1 EP 2677369 B1 EP2677369 B1 EP 2677369B1 EP 13184692 A EP13184692 A EP 13184692A EP 2677369 B1 EP2677369 B1 EP 2677369B1
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EP
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Prior art keywords
balance
inertia
block
felloe
housing
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EP13184692.5A
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German (de)
French (fr)
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EP2677369A1 (en
Inventor
Nicolas Georges Hayek
Marco Verardo
Jean-Philippe Rochat
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Montres Breguet SA
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Montres Breguet SA
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Priority to EP13184692.5A priority Critical patent/EP2677369B1/en
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    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00Mechanisms for stabilising frequency
    • G04B17/04Oscillators acting by spring tension
    • G04B17/06Oscillators with hairsprings, e.g. balance
    • G04B17/063Balance construction
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B18/00Mechanisms for setting frequency
    • G04B18/006Mechanisms for setting frequency by adjusting the devices fixed on the balance

Definitions

  • the invention also comprises a balance spring incorporating such a balance.
  • the invention also relates to a timepiece incorporating such a sprung balance or such a balance.
  • the invention relates to the field of regulating organs for timepieces, and particularly the balance or the balance spring.
  • the accuracy of the calibres depends on the quality of their regulating organ, and the obtaining of very high oscillation frequencies, for example of 10 Hz, to be compared to the usual frequencies of 2.5 to 4 Hz, can only be obtained with the design of suitable regulating members, particularly with regard to the pendulum.
  • the energy to be provided, in the form of elastic torque of the spiral, for the maintenance of the oscillation is proportional to the product, on the one hand of the inertia of the balance around its axis of rotation, by the square frequency on the other hand.
  • the passage of a frequency from 4 Hz to 10 Hz results in about the division by 6 of the inertia.
  • a pendulum inertia of 12 mg.cm 2 is considered good, such a balance typically having a diameter of 9 to 10 mm.
  • a balance for use at 10 Hz must have a low value inertia, especially less than 2 mg.cm 2 .
  • a rocker for use at 10 Hz must still, for optimal operation, be of minimum mass, especially less than 30 mg, so as to reduce friction in the bearings, so as to avoid disturbances of isochronism in the different positions of use.
  • a pendulum titanium according to the patent EP 1 562 087 in the name of WATCHES BREGUET SA designed with a serge and titanium arms and reduced sections, remains of mass and inertia that are greater than what is desired for optimal operation.
  • the document GB 2 416 408 A in the name of G. Levingston discloses a non-magnetic balance comprising components of two different materials and different expansion coefficients, arranged in such a way that the moment of inertia of the balance decreases when the temperature increases.
  • This balance comprises flyweights in two parts adjustable in translation relative to each other, and in particular in a parallel plane or coincident with that of the serge.
  • the inventive step consisted in creating the conditions of a balance structure, including the hub, the serge, and the connections between these two components as light as possible, by moving as far as possible hub of density masses if possible higher than that of this structure.
  • said at least one flyweight comprises a first portion comprising said guide means, and a second portion constituted by a regulating screw, of which a thread, or respectively a tapping, cooperates with a thread, respectively a thread. , which includes the said first part, and said thread, or said tapping respectively, does not cooperate with said serge or with said junction surface.
  • said serge is made integrally with said junction surface and said hub in a micro-machinable material or in silicon or in liga or quartz.
  • each of said portions of said at least one feeder is made of a material, which is a heavy metal or beryllium bronze or gold or platinum or tantalum or molybdenum, or one of their alloys.
  • the invention also comprises a balance spring incorporating at least one such balance.
  • the invention also relates to a timepiece incorporating at least one such sprung balance or at least one such balance.
  • the preferred use of silicon makes it possible to obtain a beam structure that is both very light and very rigid, which can be dimpled in the junction zone between the hub and the serge.
  • the transfer to the periphery of flyweights equipped with screws is favorable to obtaining a properly sized inertia despite the very low total mass of the balance.
  • the adjustment and balancing functions are ensured and facilitated.
  • the choice of a particular pair of materials, namely CuBe for a first feeder portion said stud inserted in a housing of the serge, and gold alloy for the adjusting screw screwed into this stud ensures, despite the very small dimensioning of this screw, a tightening torque ensuring its maintenance, without risk of breakage.
  • Such a pendulum is perfectly suitable for good operation at the frequency of 10 Hz, and even more so, since its dimensioning in diameter, in the following example of a preferred embodiment, is greater than or equal to the usual diameter of a pendulum . It is therefore possible to reduce its diameter, and thus further reduce its mass and inertia, for frequencies greater than 10 Hz.
  • the invention relates to the field of regulating organs for timepieces, and particularly the balance or the balance spring.
  • the invention is particularly directed to the production of pendulums for high oscillation frequencies, 10 Hz or more.
  • the invention relates to a balance 1 for a timepiece, with inertia adjustment for adjusting its oscillation frequency, comprising a hub 2 arranged to cooperate with a balance shaft 3 perpendicular to a balance plane 4, and a serge peripheral 5 continuous or discontinuous.
  • This serge 5 can indeed be discontinuous in the context of a search for relief.
  • the exemplary embodiments of the figures show a continuous serge, which offers the advantage of good rigidity and good aerodynamics, and which limits the localized flexions by preventing any warping of the balance.
  • This serge 5 is connected to the hub 2 by at least one junction surface 6, which may be constituted by a continuous surface such as a perforated disc or not, or by one or more arms 22.
  • the preparation of a junction surface 6 perforated in particular with cutouts, crossing or not, between longitudinal members ensuring a good triangulation, makes it possible to further reduce the weight of the balance.
  • the figure 14 shows an exemplary embodiment not forming part of the claimed invention with an arm 22 comprising such a perforated structure, in a mixed manner, with, separated by ribs 30, pockets 29 passing through the entire thickness of the joining surface. 6, in particular of the arm 22, and / or blind pockets 31, not traversing, on only a part of the thickness of the junction surface 6, in particular of the arm 22, for example a third, each separated from another pocket similar blind located on the other side of the arm 22 by a canvas of comparable thickness.
  • the good triangulation carried out allows a sensible economy of mass, a conventional finite element calculation makes it possible to determine the longitudinal members 30 which are essential for the mechanical strength and the resistance to twisting.
  • the annular portion of the serge 5 can also be perforated similarly. It is the same if it is preferred a continuous junction surface 6 such as a disk or the like.
  • This balance 1 also comprises at least one flyweight 7.
  • a flyweight 7 is attached to or in the serge 5 in a housing 8 that includes the periphery of the serge 5 for its reception.
  • Such a weight 7 thus comprises a first portion 10 comprising the guide means 9 and said pad, and a second portion 11 preferably constituted by a regulating screw 12, of which a thread, or respectively a tapping, cooperates with a tapping, respectively a threading, that includes the first part 10, and whose threading, or respectively the tapping, is at a distance from the serge 5 or the joining surface 6.
  • the guide means 9 and the complementary guide means 9A are linear.
  • the guide means 9 and the complementary guide means 9A are circular.
  • the holding means 13 are constituted by resilient holding means, these are constituted by clipping means 14 that comprises this feeder 7, and which are arranged to cooperate elastically with complementary clipping means 14A that includes serge 5.
  • the assembly by clipping is irreversible.
  • the elastic holding means are constituted by at least one elastic lip 15 that comprises the flyweight 7 or the housing 8.
  • This elastic lip 15 is arranged to flex in a compression position during a first insertion stroke of the weight 7 in the housing 8 and allow this introduction, and to relax in a position of relaxation in a recess 16 that respectively comprises the housing 8 or the weight 7, in a service position or in a second regulating race of the flyweight 7, this second regulation race following the first introductory race.
  • This elastic lip 15 has a stop surface 17 arranged to abut, when the lip 15 is in this detent position, with a complementary stop surface 17A arranged in return that comprises the housing 8 or the weight 7.
  • the stud has the main function of the support of the adjusting screw 12, and can therefore be reduced to its simplest expression screw insert.
  • the screwing or unscrewing of the adjusting screw 12 brings closer or moves away, or vice versa, an end of this feeder 7 carrying this screw 12, in particular the stud 10 carrying the screw 12, the serge 5, this adjusting screw 12 being motionless in translation.
  • the adjusting screw 12 has a shoulder 18, respectively a groove, arranged to cooperate in a complementary manner with a groove 19, respectively a shoulder, that includes the serge 5.
  • the rocker 1 comprises blind clearance means 20 on the hub 2 side.
  • These release means 20 are arranged to allow the insertion of this feeder 7 to the hub 2, then the setting in position of the adjusting screw 12, or adjusting screws 12 if there are several, by cooperation between the shoulder 18 and the groove 19.
  • This adjusting screw 12 is then further away from the hub 2 that the weight 7 with which it constitutes a captive assembly when they are linked by threading, respectively tapping one, cooperating with a thread, respectively a thread of the other.
  • the stud 10 has an H-shaped profile arranged to cooperate with a straight notch 21 that includes the serge 5.
  • this notch 21 is radial with respect to the hub 2.
  • the stud 10 comprises a cylindrical profile arranged to cooperate with a cylindrical bore of the housing 8 of said serge 5.
  • the stud 10 comprises a profile with a right external toothing, which is arranged to cooperate with a right internal toothing that comprises the housing 8 of the serge 5.
  • the adjusting screw 12 is radial with respect to the hub 2.
  • the weight 7 comprises at least two adjusting screws of inertia 12.
  • the rocker 1 comprises at least two weights 7A, 7B, each attached to the serge 5 in a housing 8A, 8B, which comprises the periphery of the serge 5 for its reception.
  • These weights 7A, 7B each comprise guide means complementary to complementary guide means that includes the housing 8A, 8B, and each comprise at least two portions 10, 11 adjustable in translation relative to each other in a plane parallel to the plane 4 of the balance 1, and each of these parts 10, 11 of each of these weights 7A, 7B is made of a material which is denser than a first constituent material of the serge 5.
  • flyweights 7A, 7B are symmetrical in pairs with respect to a plane passing through the hub 2 and the balance shaft 3.
  • weights 7A, 7B are symmetrical two by two with respect to said hub 2.
  • the weights 7 are four in number, arranged along two perpendicular axes passing through the hub 2 and in the plane 4 of the balance.
  • the 4 associated adjusting screws 12 allow all the angular possibilities of unbalance creation. The case where several adjusting screws are embedded on the same pad gives even more adjustment latitude.
  • the first feeder portion 10 said pad is dimensionally stable.
  • each flyweight 7, and in particular each movable portion 11 feeder or adjusting screw 12 is set back from a circle circumscribed to the serge 5, in any relative position of the parts which constitute this flyweight.
  • the serge 5 may comprise one or more cutouts 23, peripheral as on the figure 4 , or although on the inner part of the serge 5 in another embodiment not shown in the figures.
  • the joining surface consists of at least one arm 22. Thanks to the use of a silicon technology, such an arm can adopt any profile, in particular a curve, or other . It may also include lightenings, through or not, for example in the form of triangular pockets, which provide rigidity while allowing a significant weight loss.
  • the figures represent even-numbered versions of arms diametrically opposed two by two.
  • the periphery of the serge 5 comprises an alternation of surfaces which are all rigid: T-shaped joining surfaces 24 between arms 22 and serge 5 on the one hand, and surfaces of reinforced support 25 comprising the housing 8 to receive the weights 7 on the other hand.
  • a counterweight 7 is implanted in the alignment of certain arms 22, or even in the alignment of each arm 22, as in the second variant of FIG. figure 2 , or the third variant of the figure 4 and the reinforced joining zone of the arms 22 to the serge 5 may comprise a notch 21, which is functional or which constitutes a relief.
  • Balance balancing is an important operation, for which we seek a high balancing accuracy, of the order of one microgram x cm.
  • weights that includes the balance 1 are weights 7 in two parts 10 and 11 as described above.
  • the serge 5 is made integrally with the junction surface 6 and the hub 2 in silicon preferably, or a micro-machinable material, or in quartz, or according to the LIGA method .
  • each of the portions 10, 11, of each weight 7 is made of a material, which is a heavy metal, or beryllium bronze, or gold or platinum or tantalum or molybdenum, or a their oxides or their nitrides, or one of their alloys, or one of the complexes developed on their bases.
  • the second portion 11 is a control screw 12
  • this pair of materials consists of beryllium bronze of CuBe type on the one hand, and a gold alloy, at least 14 karat, on the other hand.
  • the stud 10 is beryllium bronze CuBe type and the adjusting screw 12 is made of gold alloy.
  • the mass and reduced inertia of the balance according to the invention allow the manufacture of a lower diameter of the pivot of 30 to 40% relative to the usual pivots, which has a very great influence on the level of friction.
  • the three variants presented are conjugated to a pivot with a diameter of approximately 0.05 mm.
  • the unbalance of the weights 7 is decomposed between an unbalance part which is fixed, and a part of the unbalance which is movable and serves as an adjustment.
  • the studs 10 constitute the regulating part of the unbalance, and the screws 12 are fixed in translation and constitute the fixed part of the unbalance.
  • the studs 10 constitute the fixed part of the unbalance, and the screws 12 constitute the regulating part.
  • the regulating part is always of the same value.
  • the inertia of the regulating portion is close to 0.25 mg.cm 2 .
  • the quality factor measured is close to 500 for the three variants. This quality factor is obtained by the combination of a silicon balance spring and a balance according to the invention.
  • this high quality factor and, on the other hand, the adjustment and adjustment possibilities offered by the studs 10 and the adjusting screws 12, which, in addition to their own adjustment functions, fulfill a new function. , which is to serve as a machining platform for adding or removing material in the balancing and tuning adjustment operations, allows the elimination of the racking.
  • the adjustment and adjustment of the balance are very precise, and allow the balance to be used in a high frequency oscillator, 10 Hz or more.
  • the design of the balance allows a very precise adjustment of the oscillation frequency of the sprung balance in which it is integrated.
  • the invention also comprises a sprung balance incorporating at least one such balance 1 according to the invention.
  • the invention also relates to a timepiece incorporating at least one such sprung balance or at least one such rocker 1.

Description

Domaine de l'inventionField of the invention

L'invention concerne un balancier pour pièce d'horlogerie, à réglage d'inertie pour ajuster sa fréquence d'oscillation, comportant un moyeu agencé pour coopérer avec un axe de balancier perpendiculaire à un plan de balancier, et une serge périphérique continue ou discontinue, reliée audit moyeu par au moins une surface de jonction, ledit balancier comportant encore au moins une masselotte d'inertie, ladite au moins une masselotte étant rapportée sur ladite serge dans un logement que comporte la périphérie de ladite serge pour sa réception, où:

  • ladite au moins une masselotte comporte des moyens de guidage de profil complémentaire à des moyens de guidage complémentaires que comporte ledit logement;
  • chaque dite au moins une masselotte comporte au moins deux parties réglables en translation l'une par rapport à l'autre dans un plan parallèle audit plan dudit balancier, et dont l'une desdites parties est immobile en translation par rapport à ladite serge,
  • chacune desdites parties de ladite au moins une masselotte est réalisée en un matériau qui est plus dense qu'un premier matériau constitutif de ladite serge.
The invention relates to a balance wheel for a timepiece, with inertia adjustment for adjusting its oscillation frequency, comprising a hub arranged to cooperate with a balance shaft perpendicular to a balance plane, and a continuous or discontinuous peripheral serge. connected to said hub by at least one junction surface, said rocker further comprising at least one flyweight, said at least one flyweight being attached to said serge in a housing which comprises the periphery of said serge for its reception, where:
  • said at least one flyweight comprises profile guide means complementary to complementary guide means that includes said housing;
  • each said at least one flyweight comprises at least two parts adjustable in translation relative to each other in a plane parallel to said plane of said balance, and one of said parts is immobile in translation relative to said serge,
  • each of said portions of said at least one feeder is made of a material which is denser than a first material constituting said serge.

L'invention comporte encore un balancier-spiral incorporant un tel balancier.The invention also comprises a balance spring incorporating such a balance.

L'invention concerne encore une pièce d'horlogerie incorporant un tel balancier-spiral ou un tel balancier.The invention also relates to a timepiece incorporating such a sprung balance or such a balance.

L'invention concerne le domaine des organes réglants pour pièces d'horlogerie, et tout particulièrement le balancier ou le balancier-spiral.The invention relates to the field of regulating organs for timepieces, and particularly the balance or the balance spring.

Arrière-plan de l'inventionBackground of the invention

La précision des calibres dépend de la qualité de leur organe réglant, et l'obtention de fréquences d'oscillation très élevées, par exemple de 10 Hz, à comparer aux fréquences usuelles de 2,5 à 4 Hz, ne peut être obtenue qu'avec la conception d'organes réglants adaptés, en particulier en ce qui concerne le balancier.The accuracy of the calibres depends on the quality of their regulating organ, and the obtaining of very high oscillation frequencies, for example of 10 Hz, to be compared to the usual frequencies of 2.5 to 4 Hz, can only be obtained with the design of suitable regulating members, particularly with regard to the pendulum.

En effet, l'énergie à fournir, sous forme de couple élastique du spiral, pour l'entretien de l'oscillation est proportionnelle au produit, d'une part de l'inertie du balancier autour de son axe de pivotement, par le carré de la fréquence d'autre part. Ainsi, par exemple, à énergie égale, le passage d'une fréquence de 4 Hz à 10 Hz entraîne environ la division par 6 de l'inertie. Pour une fréquence de 4 Hz, une inertie du balancier de 12 mg.cm2 est considérée comme bonne, un tel balancier ayant classiquement un diamètre de 9 à 10 mm. Ainsi, un balancier pour une utilisation à 10 Hz doit avoir une inertie de faible valeur, notamment inférieure à 2 mg.cm2.Indeed, the energy to be provided, in the form of elastic torque of the spiral, for the maintenance of the oscillation is proportional to the product, on the one hand of the inertia of the balance around its axis of rotation, by the square frequency on the other hand. Thus, for example, at equal energy, the passage of a frequency from 4 Hz to 10 Hz results in about the division by 6 of the inertia. For a frequency of 4 Hz, a pendulum inertia of 12 mg.cm 2 is considered good, such a balance typically having a diameter of 9 to 10 mm. Thus, a balance for use at 10 Hz must have a low value inertia, especially less than 2 mg.cm 2 .

Un balancier pour une utilisation à 10 Hz doit encore, pour un fonctionnement optimal, être de masse minimale, notamment inférieure à 30 mg, de façon à réduire les frottements dans les paliers, de façon à éviter les perturbations de l'isochronisme dans les différentes positions d'utilisation.A rocker for use at 10 Hz must still, for optimal operation, be of minimum mass, especially less than 30 mg, so as to reduce friction in the bearings, so as to avoid disturbances of isochronism in the different positions of use.

Tout en étant de masse et d'inertie faible, le balancier d'un oscillateur à haute fréquence doit, encore, permettre le réglage du balourd et un parfait équilibrage, statique comme dynamique, et sa construction doit autoriser des opérations de réglage ou/et d'ajustement. Il n'est donc pas possible d'utiliser les technologies classiques, ni même des solutions de balanciers allégés tels que des balanciers avec serge à rayons telle que décrite par le brevet FR 1275 357 au nom de Straumann, ou par le brevet FR 1 301 938 au nom de LIP. En effet, leur masse, même réduite, interdit d'obtenir une inertie aussi basse que souhaitée. De même, un balancier en titane selon le brevet EP 1 562 087 au nom de MONTRES BREGUET SA, conçu avec une serge et des bras en titane et des sections réduites, reste d'une masse et d'une inertie qui sont supérieures à ce qui est souhaité pour un fonctionnement optimal.While being of mass and low inertia, the balance of a high frequency oscillator must, still, allow the adjustment of unbalance and a perfect balancing, static as dynamic, and its construction must authorize operations of adjustment and / or adjustment. It is therefore not possible to use conventional technologies, or even lightened balance solutions such as spokes with spoke serge as described by the patent FR 1275357 in the name of Straumann, or by the patent FR 1 301 938 on behalf of LIP. Indeed, their mass, even reduced, prohibits to obtain as low inertia as desired. Likewise, a pendulum titanium according to the patent EP 1 562 087 in the name of WATCHES BREGUET SA, designed with a serge and titanium arms and reduced sections, remains of mass and inertia that are greater than what is desired for optimal operation.

Le document GB 2 416 408 A au nom de G. Levingston divulgue un balancier non magnétique comportant des composants de deux matériaux différents et de coefficients de dilatation différents, agencés de telle façon que le moment d'inertie du balancier décroisse quand la température augmente. Ce balancier comporte des masselottes en deux parties réglables en translation l'une par rapport à l'autre, et notamment dans un plan parallèle ou confondu avec celui de la serge.The document GB 2 416 408 A in the name of G. Levingston discloses a non-magnetic balance comprising components of two different materials and different expansion coefficients, arranged in such a way that the moment of inertia of the balance decreases when the temperature increases. This balance comprises flyweights in two parts adjustable in translation relative to each other, and in particular in a parallel plane or coincident with that of the serge.

Le document CH 16 676 au nom de H. Sandoz décrit un balancier à moment d'inertie réglable au moyen de contrepoids mobiles par rapport à son centre, soit par des leviers réglables en appui par vis, soit par masses taraudées mobiles sur des tiges filetées.The document CH 16 676 in the name of H. Sandoz discloses a rocker with adjustable moment of inertia by means of mobile counterweight relative to its center, either by adjustable levers supported by screws, or by threaded masses movable on threaded rods.

Résumé de l'inventionSummary of the invention

Il est également recherché un facteur de qualité de l'ordre de 500, donc nettement supérieur à ceux des oscillateurs traditionnels où il est voisin de 220 à 280 pour des montres de bonne qualité. Un tel facteur de qualité ne peut s'obtenir que par la conjugaison d'un spiral silicium et d'un balancier remplissant les conditions ci-dessus. L'obtention d'un facteur de qualité élevé, conjuguée à des possibilités de réglage et d'ajustement, doivent, encore, permettre l'élimination de la raquetterie.It is also sought a quality factor of the order of 500, so significantly higher than those of traditional oscillators where it is close to 220 to 280 for good quality watches. Such a quality factor can only be obtained by the combination of a silicon balance spring and a balance fulfilling the above conditions. Obtaining a high quality factor, combined with adjustment and adjustment possibilities, must, again, allow the elimination of the raquetterie.

Naturellement, la masse de l'ensemble étant limitée, le nombre de composants le plus réduit possible est à privilégier.Naturally, the mass of the assembly being limited, the number of components as small as possible is to be preferred.

La démarche inventive a consisté à créer les conditions d'une structure de balancier, incluant le moyeu, la serge, et les liaisons entre ces deux composants la plus légère possible, en éloignant au maximum du moyeu des masses de densité si possible supérieure à celle de cette structure.The inventive step consisted in creating the conditions of a balance structure, including the hub, the serge, and the connections between these two components as light as possible, by moving as far as possible hub of density masses if possible higher than that of this structure.

A cet effet l'invention concerne un balancier pour pièce d'horlogerie, à réglage d'inertie pour ajuster sa fréquence d'oscillation, comportant un moyeu agencé pour coopérer avec un axe de balancier perpendiculaire à un plan de balancier, et une serge périphérique continue ou discontinue, reliée audit moyeu par au moins une surface de jonction, ledit balancier comportant encore au moins une masselotte d'inertie, ladite au moins une masselotte étant rapportée sur ladite serge dans un logement que comporte la périphérie de ladite serge pour sa réception, où:

  • ladite au moins une masselotte comporte des moyens de guidage de profil complémentaire à des moyens de guidage complémentaires que comporte ledit logement;
  • chaque dite au moins une masselotte comporte au moins deux parties réglables en translation l'une par rapport à l'autre dans un plan parallèle audit plan dudit balancier, et dont l'une desdites parties est immobile en translation par rapport à ladite serge,
  • chacune desdites parties de ladite au moins une masselotte est réalisée en un matériau qui est plus dense qu'un premier matériau constitutif de ladite serge,
caractérisé en ce que ladite au moins une masselotte est maintenue dans ledit logement par des moyens de maintien qui sont des moyens de maintien élastique agencés pour autoriser l'introduction de ladite au moins une masselotte dans ledit logement et pour interdire son extraction.For this purpose the invention relates to a balance for a timepiece, with inertia adjustment for adjusting its oscillation frequency, comprising a hub arranged to cooperate with a balance shaft perpendicular to a balance plane, and a peripheral serge. continuous or discontinuous, connected to said hub by at least one junction surface, said balance further comprising at least one flyweight, said at least one flyweight being attached to said serge in a housing that comprises the periphery of said serge for its reception , or:
  • said at least one flyweight comprises profile guide means complementary to complementary guide means that includes said housing;
  • each said at least one flyweight comprises at least two parts adjustable in translation relative to each other in a plane parallel to said plane of said balance, and one of said parts is immobile in translation relative to said serge,
  • each of said portions of said at least one feeder is made of a material which is denser than a first material constituting said serge,
characterized in that said at least one flyweight is held in said housing by holding means which are elastic holding means arranged to allow the introduction of said at least one feeder into said housing and to prohibit its extraction.

Selon une caractéristique de l'invention, ladite au moins une masselotte comporte une première partie comportant lesdits moyens de guidage, et une deuxième partie constituée par une vis réglante, dont un filetage, ou respectivement un taraudage, coopère avec un taraudage, respectivement un filetage, que comporte ladite première partie, et dont ledit filetage, ou respectivement ledit taraudage, ne coopère pas avec ladite serge ni avec ladite surface de jonction.According to one characteristic of the invention, said at least one flyweight comprises a first portion comprising said guide means, and a second portion constituted by a regulating screw, of which a thread, or respectively a tapping, cooperates with a thread, respectively a thread. , which includes the said first part, and said thread, or said tapping respectively, does not cooperate with said serge or with said junction surface.

Selon une autre caractéristique de l'invention, ladite serge est réalisée de façon monobloc avec ladite surface de jonction et ledit moyeu dans un matériau micro-usinable ou en silicium ou en liga ou en quartz.According to another characteristic of the invention, said serge is made integrally with said junction surface and said hub in a micro-machinable material or in silicon or in liga or quartz.

Selon une autre caractéristique de l'invention, chacune desdites parties de ladite au moins une masselotte est réalisée en un matériau, qui est un métal lourd ou du bronze au béryllium ou de l'or ou du platine ou du tantale ou du molybdène, ou un de leurs alliages.According to another characteristic of the invention, each of said portions of said at least one feeder is made of a material, which is a heavy metal or beryllium bronze or gold or platinum or tantalum or molybdenum, or one of their alloys.

L'invention comporte encore un balancier-spiral incorporant au moins un tel balancier.The invention also comprises a balance spring incorporating at least one such balance.

L'invention concerne encore une pièce d'horlogerie incorporant au moins un tel balancier-spiral ou au moins un tel balancier.The invention also relates to a timepiece incorporating at least one such sprung balance or at least one such balance.

L'emploi préféré du silicium permet d'obtenir une structure de balancier à la fois très légère et très rigide, qui peut être alvéolée dans la zone de jonction entre le moyeu et la serge. Le report en périphérie de masselottes équipées de vis est favorable à l'obtention d'une inertie correctement dimensionnée malgré la très faible masse totale du balancier. Les fonctionnalités de réglage et d'équilibrage sont assurées et facilitées. Le choix d'un couple de matériaux particulier, à savoir CuBe pour une première partie de masselotte dite plot insérée dans un logement de la serge, et alliage d'or pour la vis réglante vissée dans ce plot permet d'assurer, malgré le très petit dimensionnement de cette vis, un couple de serrage assurant son maintien, sans risque de casse.The preferred use of silicon makes it possible to obtain a beam structure that is both very light and very rigid, which can be dimpled in the junction zone between the hub and the serge. The transfer to the periphery of flyweights equipped with screws is favorable to obtaining a properly sized inertia despite the very low total mass of the balance. The adjustment and balancing functions are ensured and facilitated. The choice of a particular pair of materials, namely CuBe for a first feeder portion said stud inserted in a housing of the serge, and gold alloy for the adjusting screw screwed into this stud ensures, despite the very small dimensioning of this screw, a tightening torque ensuring its maintenance, without risk of breakage.

Un tel balancier est parfaitement approprié pour un bon fonctionnement à la fréquence de 10 Hz, et même davantage, puisque son dimensionnement en diamètre, dans l'exemple qui suit d'une réalisation préférée, est supérieur ou égal au diamètre usuel d'un balancier. Il est donc envisageable de réduire son diamètre, et donc de réduire encore sa masse et son inertie, pour des fréquences supérieures à 10 Hz.Such a pendulum is perfectly suitable for good operation at the frequency of 10 Hz, and even more so, since its dimensioning in diameter, in the following example of a preferred embodiment, is greater than or equal to the usual diameter of a pendulum . It is therefore possible to reduce its diameter, and thus further reduce its mass and inertia, for frequencies greater than 10 Hz.

Description sommaire des dessinsBrief description of the drawings

D'autres avantages de l'invention apparaîtront à la lecture de la description qui va suivre, en référence aux figures annexées où :

  • la figure 1 représente, de façon schématisée et en perspective, une première variante d'un balancier selon un exemple ne faisant pas partie de l'invention revendiquée;
  • la figure 2 représente, de façon analogue à la figure 1, une deuxième variante selon un exemple ne faisant pas partie de l'invention revendiquée,
  • la figure 3 représente, de façon schématisée et en perspective, un détail de la figure 2 mettant en évidence une masselotte d'inertie ;
  • la figure 4 représente, de façon analogue à la figure 1, une troisième variante selon un exemple ne faisant pas partie de l'invention revendiquée,
  • la figure 5 représente, de façon analogue à la figure 3, un détail de la figure 4;
  • la figure 6 représente, de façon schématisée et en vue de face, la deuxième variante objet de la figure 2 ;
  • la figure 7 représente, de façon schématisée, une section selon le plan AA de la figure 6 ;
  • la figure 8 représente, de façon schématisée, une section selon le plan BB de la figure 6 ;
  • la figure 9 représente, de façon schématisée et en vue de face, la troisième variante objet de la figure 4 ;
  • la figure 10 représente, de façon schématisée, une section selon le plan AA de la figure 9 ;
  • la figure 11 représente, de façon schématisée, une section selon le plan BB de la figure 9 ;
  • la figure 12 représente, de façon schématisée et en section dans un plan médian, un détail d'une réalisation particulière de l'invention ;
  • la figure 13 représente, de façon analogue à la figure 12, un détail d'une autre réalisation particulière de l'invention ;
  • la figure 14 représente, de façon schématisée, partielle et en vue de face, un détail d'un balancier selon un exemple ne faisant pas partie de l'invention revendiquée comportant une zone de jonction ajourée entre le moyeu et la serge.
Other advantages of the invention will appear on reading the description which follows, with reference to the appended figures in which:
  • the figure 1 represents, schematically and in perspective, a first variant of a pendulum according to an example not forming part of the claimed invention;
  • the figure 2 represents, in a similar way to figure 1 a second variant according to an example not forming part of the claimed invention,
  • the figure 3 represents, schematically and in perspective, a detail of the figure 2 highlighting a flyweight of inertia;
  • the figure 4 represents, in a similar way to figure 1 a third variant according to an example not forming part of the claimed invention,
  • the figure 5 represents, in a similar way to figure 3 , a detail of the figure 4 ;
  • the figure 6 represents, schematically and in front view, the second variant object of the figure 2 ;
  • the figure 7 schematically represents a section according to the plane AA of the figure 6 ;
  • the figure 8 represents, schematically, a section along the plane BB of the figure 6 ;
  • the figure 9 represents, schematically and in front view, the third variant object of the figure 4 ;
  • the figure 10 schematically represents a section according to the plane AA of the figure 9 ;
  • the figure 11 represents, schematically, a section along the plane BB of the figure 9 ;
  • the figure 12 represents, schematically and in section in a median plane, a detail of a particular embodiment of the invention;
  • the figure 13 represents, in a similar way to figure 12 a detail of another particular embodiment of the invention;
  • the figure 14 represents, schematically, partially and in front view, a detail of a beam according to an example not forming part of the claimed invention having a junction zone perforated between the hub and the serge.

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

L'invention concerne le domaine des organes réglants pour pièces d'horlogerie, et tout particulièrement le balancier ou le balancier-spiral.The invention relates to the field of regulating organs for timepieces, and particularly the balance or the balance spring.

L'invention est tout particulièrement orientée vers la production de balanciers pour de hautes fréquences d'oscillation, 10 Hz ou davantage.The invention is particularly directed to the production of pendulums for high oscillation frequencies, 10 Hz or more.

Trois variantes de réalisation, nullement limitatives, sont représentées sur les figures.Three non-limiting embodiments are shown in the figures.

L'invention concerne un balancier 1 pour pièce d'horlogerie, à réglage d'inertie pour ajuster sa fréquence d'oscillation, comportant un moyeu 2 agencé pour coopérer avec un axe de balancier 3 perpendiculaire à un plan de balancier 4, et une serge périphérique 5 continue ou discontinue. Cette serge 5 peut en effet être discontinue dans le cadre d'une recherche d'allégement. Les exemples de réalisation des figures montrent une serge continue, qui offre l'avantage d'une bonne rigidité et d'un bon aérodynamisme, et qui limite les flexions localisées en prévenant tout gauchissement du balancier.The invention relates to a balance 1 for a timepiece, with inertia adjustment for adjusting its oscillation frequency, comprising a hub 2 arranged to cooperate with a balance shaft 3 perpendicular to a balance plane 4, and a serge peripheral 5 continuous or discontinuous. This serge 5 can indeed be discontinuous in the context of a search for relief. The exemplary embodiments of the figures show a continuous serge, which offers the advantage of good rigidity and good aerodynamics, and which limits the localized flexions by preventing any warping of the balance.

Cette serge 5 est reliée au moyeu 2 par au moins une surface de jonction 6, qui peut être constituée par une surface continue tel un disque ajouré ou non, ou par un ou plusieurs bras 22. La confection d'une surface de jonction 6 ajourée, notamment avec des découpes, traversantes ou non, entre des longerons assurant une bonne triangulation, permet de réduire encore la masse du balancier.This serge 5 is connected to the hub 2 by at least one junction surface 6, which may be constituted by a continuous surface such as a perforated disc or not, or by one or more arms 22. The preparation of a junction surface 6 perforated , in particular with cutouts, crossing or not, between longitudinal members ensuring a good triangulation, makes it possible to further reduce the weight of the balance.

La figure 14 montre un exemple de réalisation ne faisant pas partie de l'invention revendiquée avec un bras 22 comportant une telle structure ajourée, de façon mixte, avec, séparées par des nervures 30, des poches 29 traversantes sur toute l'épaisseur de la surface de jonction 6, notamment du bras 22, ou/et des poches 31 borgnes, non traversantes, sur une partie seulement de l'épaisseur de la surface de jonction 6, notamment du bras 22, par exemple un tiers, chacune séparée d'une autre poche borgne similaire située sur l'autre face du bras 22 par une toile d'épaisseur comparable. La bonne triangulation effectuée permet une économie de masse sensible, un calcul classique par éléments finis permet de déterminer les longerons 30 qui sont essentiels à la tenue mécanique et à la résistance au vrillage. Bien évidemment, la partie annulaire de la serge 5 peut également être ajourée de façon similaire. Il en est de même s'il est préféré une surface de jonction 6 continue telle qu'un disque ou similaire.The figure 14 shows an exemplary embodiment not forming part of the claimed invention with an arm 22 comprising such a perforated structure, in a mixed manner, with, separated by ribs 30, pockets 29 passing through the entire thickness of the joining surface. 6, in particular of the arm 22, and / or blind pockets 31, not traversing, on only a part of the thickness of the junction surface 6, in particular of the arm 22, for example a third, each separated from another pocket similar blind located on the other side of the arm 22 by a canvas of comparable thickness. The good triangulation carried out allows a sensible economy of mass, a conventional finite element calculation makes it possible to determine the longitudinal members 30 which are essential for the mechanical strength and the resistance to twisting. Of course, the annular portion of the serge 5 can also be perforated similarly. It is the same if it is preferred a continuous junction surface 6 such as a disk or the like.

Ce balancier 1 comporte encore au moins une masselotte d'inertie 7. Une telle masselotte 7 est rapportée sur, ou dans, la serge 5 dans un logement 8 que comporte la périphérie de la serge 5 pour sa réception.This balance 1 also comprises at least one flyweight 7. Such a flyweight 7 is attached to or in the serge 5 in a housing 8 that includes the periphery of the serge 5 for its reception.

Selon l'invention :

  • cette masselotte 7 comporte des moyens de guidage 9, de profil complémentaire à des moyens de guidage complémentaires 9A que comporte le logement 8 avec lequel coopère cette masselotte 7;
  • chaque telle masselotte 7 comporte au moins deux parties 10, 11, qui sont réglables en translation l'une par rapport à l'autre dans un plan parallèle au plan 4 dudit balancier 1, et dont l'une de ces parties 10 ; 11, est immobile en translation par rapport à la serge 5 ;
  • chacune de ces parties 10, 11 d'une telle masselotte 7 est réalisée en un matériau qui est plus dense qu'un premier matériau constitutif de la serge 5.
According to the invention:
  • this weight 7 comprises guiding means 9 of complementary profile to complementary guiding means 9A that includes the housing 8 with which cooperates this feeder 7;
  • each such weight 7 comprises at least two parts 10, 11, which are adjustable in translation relative to each other in a plane parallel to the plane 4 of said beam 1, and one of these parts 10; 11, is immobile in translation relative to the serge 5;
  • each of these portions 10, 11 of such a weight 7 is made of a material which is denser than a first material constituting the serge 5.

Une telle masselotte 7 comporte ainsi une première partie 10 comportant les moyens de guidage 9 et dite plot, et une deuxième partie 11 constituée de préférence par une vis réglante 12, dont un filetage, ou respectivement un taraudage, coopère avec un taraudage, respectivement un filetage, que comporte la première partie 10, et dont le filetage, ou respectivement le taraudage, est à distance de la serge 5 ou de la surface de jonction 6.Such a weight 7 thus comprises a first portion 10 comprising the guide means 9 and said pad, and a second portion 11 preferably constituted by a regulating screw 12, of which a thread, or respectively a tapping, cooperates with a tapping, respectively a threading, that includes the first part 10, and whose threading, or respectively the tapping, is at a distance from the serge 5 or the joining surface 6.

Dans un premier exemple, tel que visible notamment sur la première variante de la figure 1 et sur la deuxième variante de la figure 2, les moyens de guidage 9 et les moyens de guidage complémentaires 9A sont linéaires.In a first example, as can be seen in particular on the first variant of the figure 1 and on the second variant of the figure 2 the guide means 9 and the complementary guide means 9A are linear.

Dans un deuxième exemple, tel que visible notamment sur la troisième variante de la figure 4, les moyens de guidage 9 et les moyens de guidage complémentaires 9A sont circulaires.In a second example, as can be seen in particular on the third variant of the figure 4 the guide means 9 and the complementary guide means 9A are circular.

De façon préférée, cette masselotte 7 est maintenue dans son logement 8 par des moyens de maintien 13. Ces derniers peuvent être de différentes natures, notamment :

  • moyens de maintien géométriques agencés pour interdire l'extraction de cette masselotte 7 de son logement 8, tel que visible sur la deuxième variante de réalisation de la figure 2 ;
  • moyens de maintien à demeure réalisés par chassage ou collage ou brasage ou soudage ; en cas de collage un jeu d'environ 10 microns est à prévoir pour ajuster au mieux la quantité de colle et permettre une prise correcte ;
  • selon l'invention, il s'agit de moyens de maintien élastique agencés pour autoriser l'introduction de cette masselotte 7 dans son logement 8 et pour interdire son extraction, tel que visible sur les figures 12 ou 13.
Preferably, this weight 7 is maintained in its housing 8 by holding means 13. The latter can be of different types, including:
  • geometric holding means arranged to prohibit the extraction of this feeder 7 from its housing 8, as visible in the second embodiment of the invention. figure 2 ;
  • permanent holding means made by driving or gluing or brazing or welding; in the case of bonding a set of about 10 microns is to be provided to adjust the amount of glue and allow a correct grip;
  • according to the invention, it is elastic holding means arranged to allow the introduction of this feeder 7 in its housing 8 and to prohibit its extraction, as visible on the Figures 12 or 13 .

De préférence, quand les moyens de maintien 13 sont constitués par des moyens de maintien élastique, ceux-ci sont constitués par des moyens de clipage 14 que comporte cette masselotte 7, et qui sont agencés pour coopérer de façon élastique avec des moyens de clipage complémentaire 14A que comporte la serge 5.Preferably, when the holding means 13 are constituted by resilient holding means, these are constituted by clipping means 14 that comprises this feeder 7, and which are arranged to cooperate elastically with complementary clipping means 14A that includes serge 5.

Préférentiellement, l'assemblage par clipage est irréversible.Preferably, the assembly by clipping is irreversible.

Dans les modes de réalisation représentés aux figures 12 et 13, les moyens de maintien élastique sont constitués par au moins une lèvre élastique 15 que comporte cette masselotte 7 ou le logement 8. Cette lèvre élastique 15 est agencée pour fléchir dans une position de compression pendant une première course d'introduction de la masselotte 7 dans le logement 8 et autoriser cette introduction, et pour se détendre dans une position de détente dans un embrèvement 16 que comporte respectivement le logement 8 ou la masselotte 7, dans une position de service ou bien dans une deuxième course réglante de cette masselotte 7, cette deuxième course réglante faisant suite à la première course d'introduction. Cette lèvre élastique 15 comporte une surface d'arrêt 17 agencée pour venir en butée, quand la lèvre 15 est dans cette position de détente, avec une surface d'arrêt complémentaire 17A disposée en retour que comporte le logement 8 ou la masselotte 7.In the embodiments shown in Figures 12 and 13 , the elastic holding means are constituted by at least one elastic lip 15 that comprises the flyweight 7 or the housing 8. This elastic lip 15 is arranged to flex in a compression position during a first insertion stroke of the weight 7 in the housing 8 and allow this introduction, and to relax in a position of relaxation in a recess 16 that respectively comprises the housing 8 or the weight 7, in a service position or in a second regulating race of the flyweight 7, this second regulation race following the first introductory race. This elastic lip 15 has a stop surface 17 arranged to abut, when the lip 15 is in this detent position, with a complementary stop surface 17A arranged in return that comprises the housing 8 or the weight 7.

Dans certains exemples, comme la première variante de la figure 1, ou la troisième variante de la figure 4, le vissage ou le dévissage de la vis réglante 12 rapproche ou éloigne, ou inversement, une extrémité de cette vis réglante 12 de la serge 5, la première partie 10 ou plot de la masselotte 7 étant immobile en translation. Dans cette version, le plot a pour fonction principale le support de la vis réglante 12, et peut donc être réduit à sa plus simple expression d'insert porte-vis.In some examples, like the first variant of the figure 1 , or the third variant of the figure 4 , screwing or unscrewing the adjusting screw 12 brings closer or moves away, or conversely, one end of this adjusting screw 12 of the serge 5, the first portion 10 or pad of the feeder 7 being immobile in translation. In this version, the stud has the main function of the support of the adjusting screw 12, and can therefore be reduced to its simplest expression screw insert.

Dans d'autres exemples, comme la deuxième variante de la figure 2, le vissage ou le dévissage de la vis réglante 12 rapproche ou éloigne, ou inversement, une extrémité de cette masselotte 7 porteuse de cette vis 12, en particulier le plot 10 porteur de la vis 12, de la serge 5, cette vis réglante 12 étant immobile en translation. Dans cet exemple de réalisation, tel que visible sur les figures 3, 7 et 8, la vis réglante 12 comporte un épaulement 18, respectivement une gorge, agencée pour coopérer de façon complémentaire avec une gorge 19, respectivement un épaulement, que comporte la serge 5.In other examples, such as the second variant of the figure 2 , the screwing or unscrewing of the adjusting screw 12 brings closer or moves away, or vice versa, an end of this feeder 7 carrying this screw 12, in particular the stud 10 carrying the screw 12, the serge 5, this adjusting screw 12 being motionless in translation. In this embodiment, as visible on the figures 3 , 7 and 8 the adjusting screw 12 has a shoulder 18, respectively a groove, arranged to cooperate in a complementary manner with a groove 19, respectively a shoulder, that includes the serge 5.

De préférence, quand ce plot 10 est mobile, comme la deuxième variante de la figure 2, le balancier 1 comporte des moyens de dégagement borgnes 20 du côté du moyeu 2. Ces moyens de dégagement 20 sont agencés pour permettre l'insertion de cette masselotte 7 vers le moyeu 2, puis la mise en position de la vis réglante 12, ou des vis réglantes 12 s'il y en a plusieurs, par coopération entre l'épaulement 18 et la gorge 19. Cette vis réglante 12 est alors plus éloignée du moyeu 2 que la masselotte 7 avec laquelle elle constitue un ensemble imperdable quand elles sont liées par un filetage, respectivement taraudage de l'une, coopérant avec un taraudage, respectivement un filetage de l'autre.Preferably, when this stud 10 is mobile, as the second variant of the figure 2 , the rocker 1 comprises blind clearance means 20 on the hub 2 side. These release means 20 are arranged to allow the insertion of this feeder 7 to the hub 2, then the setting in position of the adjusting screw 12, or adjusting screws 12 if there are several, by cooperation between the shoulder 18 and the groove 19. This adjusting screw 12 is then further away from the hub 2 that the weight 7 with which it constitutes a captive assembly when they are linked by threading, respectively tapping one, cooperating with a thread, respectively a thread of the other.

Dans cette même deuxième variante de la figure 2, le plot 10 comporte un profil en H agencé pour coopérer avec une encoche droite 21 que comporte la serge 5.In this same second variant of the figure 2 , the stud 10 has an H-shaped profile arranged to cooperate with a straight notch 21 that includes the serge 5.

Dans une version particulière, telle que représentée sur les figures 2 et 6, et nullement limitative, cette encoche 21 est radiale par rapport au moyeu 2.In a particular version, as represented on the figures 2 and 6 , and in no way limiting, this notch 21 is radial with respect to the hub 2.

Dans le deuxième exemple, tel que visible notamment sur la troisième variante de la figure 4, le plot 10 comporte un profil cylindrique agencé pour coopérer avec un alésage cylindrique du logement 8 de ladite serge 5. Dans une variante qui ne fait pas partie de l'invention revendiquée et non représentée sur les figures, le plot 10 comporte un profil avec une denture extérieure droite, qui est agencé pour coopérer avec une denture intérieure droite que comporte le logement 8 de la serge 5.In the second example, as can be seen in particular on the third variant of the figure 4 the stud 10 comprises a cylindrical profile arranged to cooperate with a cylindrical bore of the housing 8 of said serge 5. In a variant which does not form part of the invention claimed and not shown in the figures, the stud 10 comprises a profile with a right external toothing, which is arranged to cooperate with a right internal toothing that comprises the housing 8 of the serge 5.

De façon préférée, tel que visible sur les figures, la vis réglante 12 est radiale par rapport au moyeu 2.Preferably, as shown in the figures, the adjusting screw 12 is radial with respect to the hub 2.

Dans une variante non représentée sur les figures, la masselotte 7 comporte au moins deux vis réglantes d'inertie 12.In a variant not shown in the figures, the weight 7 comprises at least two adjusting screws of inertia 12.

De préférence, et tel qu'illustré par les figures, le balancier 1 comporte au moins deux masselottes 7A, 7B, chacune rapportée sur la serge 5 dans un logement 8A, 8B, que comporte la périphérie de la serge 5 pour sa réception. Ces masselottes 7A, 7B comportent chacune des moyens de guidage de profil complémentaire à des moyens de guidage complémentaires que comporte le logement 8A, 8B, et comportent chacune au moins deux parties 10, 11 réglables en translation l'une par rapport à l'autre dans un plan parallèle au plan 4 du balancier 1, et chacune de ces parties 10, 11 de chacune de ces masselottes 7A, 7B, est réalisée en un matériau qui est plus dense qu'un premier matériau constitutif de la serge 5.Preferably, and as illustrated by the figures, the rocker 1 comprises at least two weights 7A, 7B, each attached to the serge 5 in a housing 8A, 8B, which comprises the periphery of the serge 5 for its reception. These weights 7A, 7B each comprise guide means complementary to complementary guide means that includes the housing 8A, 8B, and each comprise at least two portions 10, 11 adjustable in translation relative to each other in a plane parallel to the plane 4 of the balance 1, and each of these parts 10, 11 of each of these weights 7A, 7B is made of a material which is denser than a first constituent material of the serge 5.

De préférence ces masselottes 7A, 7B, sont symétriques deux à deux par rapport à un plan passant par le moyeu 2 et l'axe de balancier 3.Preferably these flyweights 7A, 7B are symmetrical in pairs with respect to a plane passing through the hub 2 and the balance shaft 3.

De préférence ces masselottes 7A, 7B, sont symétriques deux à deux par rapport audit moyeu 2.Preferably these weights 7A, 7B are symmetrical two by two with respect to said hub 2.

Dans une exécution préférée, tel que visible sur les figures, les masselottes 7 sont au nombre de quatre, disposées selon deux axes perpendiculaires passant par le moyeu 2 et dans le plan 4 du balancier. Les 4 vis réglantes 12 associées permettent toutes les possibilités angulaires de création de balourd. Le cas où plusieurs vis réglantes sont embarquées sur un même plot donne encore plus de latitude de réglage.In a preferred embodiment, as shown in the figures, the weights 7 are four in number, arranged along two perpendicular axes passing through the hub 2 and in the plane 4 of the balance. The 4 associated adjusting screws 12 allow all the angular possibilities of unbalance creation. The case where several adjusting screws are embedded on the same pad gives even more adjustment latitude.

Dans une exécution particulière, correspondant notamment mais non limitativement à la deuxième variante de la figure 2, la première partie de masselotte 10 dite plot est indéformable.In a particular embodiment, corresponding in particular but not limited to the second variant of the figure 2 , the first feeder portion 10 said pad is dimensionally stable.

Afin de limiter la traînée aérodynamique, chaque masselotte 7, et en particulier chaque partie mobile 11 de masselotte ou vis réglante 12, est en retrait d'un cercle circonscrit à la serge 5, dans toute position relative des parties qui constituent cette masselotte.In order to limit the aerodynamic drag, each flyweight 7, and in particular each movable portion 11 feeder or adjusting screw 12, is set back from a circle circumscribed to the serge 5, in any relative position of the parts which constitute this flyweight.

A de fins d'allégement supplémentaire, la serge 5 peut comporter une ou plusieurs découpes 23, périphériques comme sur la figure 4, ou bien sur la partie intérieure de la serge 5 dans une autre exécution non représentée sur les figures.For purposes of additional relief, the serge 5 may comprise one or more cutouts 23, peripheral as on the figure 4 , or although on the inner part of the serge 5 in another embodiment not shown in the figures.

Dans une exécution préférée, tel que visible sur les figures, la surface de jonction est constituée d'au moins un bras 22. Grâce à l'emploi d'une technologie silicium, un tel bras peut adopter tout profil, notamment courbe, ou autre. Il peut aussi comporter des allègements, traversants ou non, par exemple sous forme de poches triangulaires, qui assurent la rigidité tout en autorisant une perte de poids conséquente. Les figures représentent des versions à nombre pair de bras diamétralement opposés deux à deux.In a preferred embodiment, as can be seen in the figures, the joining surface consists of at least one arm 22. Thanks to the use of a silicon technology, such an arm can adopt any profile, in particular a curve, or other . It may also include lightenings, through or not, for example in the form of triangular pockets, which provide rigidity while allowing a significant weight loss. The figures represent even-numbered versions of arms diametrically opposed two by two.

Dans la première variante de la figure 1, ces bras 22 sont alternés avec les masselottes 7, la périphérie de la serge 5 comporte une alternance de surfaces qui sont toutes rigides : surfaces de jonction 24 en forme de Té entre bras 22 et serge 5 d'une part, et surfaces d'appui renforcées 25 comportant les logements 8 pour recevoir les masselottes 7 d'autre part.In the first variant of the figure 1 these arms 22 are alternated with the weights 7, the periphery of the serge 5 comprises an alternation of surfaces which are all rigid: T-shaped joining surfaces 24 between arms 22 and serge 5 on the one hand, and surfaces of reinforced support 25 comprising the housing 8 to receive the weights 7 on the other hand.

Dans un autre type d'exécution, une masselotte 7 est implantée dans l'alignement de certains bras 22, ou même dans l'alignement de chaque bras 22, comme dans la deuxième variante de la figure 2, ou la troisième variante de la figure 4, et la zone de jonction renforcée des bras 22 à la serge 5 peut comporter une encoche 21, qui est fonctionnelle ou bien qui constitue un allègement.In another type of embodiment, a counterweight 7 is implanted in the alignment of certain arms 22, or even in the alignment of each arm 22, as in the second variant of FIG. figure 2 , or the third variant of the figure 4 and the reinforced joining zone of the arms 22 to the serge 5 may comprise a notch 21, which is functional or which constitutes a relief.

Il faut pouvoir commodément ajuster le balourd d'une part, et corriger l'inertie d'autre part, et surtout ajuster très précisément la fréquence de l'oscillateur.It must be able to conveniently adjust the unbalance on the one hand, and correct the inertia on the other hand, and especially adjust very precisely the frequency of the oscillator.

L'équilibrage d'un balancier est une opération importante, pour laquelle on recherche une précision élevée d'équilibrage, de l'ordre du microgramme x cm.Balance balancing is an important operation, for which we seek a high balancing accuracy, of the order of one microgram x cm.

Avantageusement, chaque masselotte 7 est profilée d'une façon particulière, de façon à permettre, séparément ou à la fois :

  • un équilibrage facilité par l'existence d'au moins une surface plane, qui est constituée, soit par une surface plane dite parallèle 26, qui est parallèle au plan de balancier 4, soit par une surface plane de bout 27 qui est perpendiculaire au plan de balancier 4 et à une radiale issue de l'axe de balancier 3. Une même masselotte 7 peut comporter à la fois une ou plusieurs surfaces parallèles 26, et une ou plusieurs surfaces de bout 27, notamment, tel que visible sur les figures, une surface de bout sur la première partie 10 ou le plot, et une surface de bout 27 sur la deuxième partie 11 ou la vis réglante 12. Il est alors aisé de réaliser l'équilibrage par fraisage ou gravure ou autre sur l'une de ces surfaces 26 ou/et 27, ou encore par apport de matière, notamment par brasage, soudage ou plasma si le plot 10 ou/et la vis réglante 12 est métallique ;
  • une traînée aérodynamique réduite, la masselotte 7 comportant alors, dans toute section perpendiculaire au plan 4 de balancier et à un plan passant par l'axe de balancier 3, un profil aérodynamique 28 rayonné ou/et pentu pour réduire son frottement dans l'air.
Advantageously, each weight 7 is profiled in a particular way, so as to allow, separately or at the same time:
  • balancing facilitated by the existence of at least one plane surface, which is constituted either by a so-called parallel flat surface 26, which is parallel to the balance plane 4, or by a flat end surface 27 which is perpendicular to the plane 4 and a radial stem from the balance shaft 3. A same flyweight 7 may comprise both one or more parallel surfaces 26, and one or more end surfaces 27, in particular, as visible in the figures, an end surface on the first part 10 or the pad, and an end surface 27 on the second part 11 or the adjusting screw 12. It is then easy to achieve balancing by milling or etching or other on one of these surfaces 26 or / and 27, or by addition of material, in particular by brazing, welding or plasma if the pad 10 and / or the adjusting screw 12 is metallic;
  • a reduced aerodynamic drag, the flyweight 7 then comprising, in any section perpendicular to the balance plane 4 and to a plane passing through the balance shaft 3, an aerodynamic profile 28 radiated and / or sloping to reduce its friction in the air .

De façon préférée, toutes les masselottes que comporte le balancier 1 sont des masselottes 7 en deux parties 10 et 11 telles que décrites ci-dessus.Preferably, all the weights that includes the balance 1 are weights 7 in two parts 10 and 11 as described above.

De façon préférée et propre à l'invention, la serge 5 est réalisée de façon monobloc avec la surface de jonction 6 et le moyeu 2 dans du silicium de préférence, ou un matériau micro-usinable, ou en quartz, ou selon le procédé LIGA.In a preferred manner and specific to the invention, the serge 5 is made integrally with the junction surface 6 and the hub 2 in silicon preferably, or a micro-machinable material, or in quartz, or according to the LIGA method .

L'emploi du silicium permet un dimensionnement en diamètre sensiblement supérieur à ce que l'on aurait, à inertie semblable, avec un balancier de facture traditionnelle. Ici, les balanciers des trois variantes présentées ont un diamètre de l'ordre de 7 mm.The use of silicon allows dimensioning in diameter substantially greater than one would, at similar inertia, with a balance of traditional invoice. Here, the rockers of the three variants presented have a diameter of about 7 mm.

Le choix du silicium, en particulier, autorise la réalisation, dans la serge, de moyens de maintien élastique des masselottes 7, notamment sous forme de lèvre élastique 15. De la même façon, des moyens d'arrêt sous forme de cliquets peuvent être combinés à de telles lames ou à des ressorts réalisés dans la serge en silicium.The choice of silicon, in particular, makes it possible to produce, in the serge, means for elastic retention of the weights 7, in particular in the form of an elastic lip 15. In the same way, means of stopping in the form of ratchets can be combined with such blades or springs made in the silicon serge.

Ce choix du silicium ou du liga permet, par l'excellente résolution lors du façonnage, d'assurer une géométrie très précise de la serge 5, et ainsi d'éviter tous les jeux générateurs de vibrations et préjudiciables au bon fonctionnement de l'oscillateur.This choice of silicon or liga makes it possible, by the excellent resolution during the shaping, to ensure a very precise geometry of the serge 5, and thus to avoid all games generating vibrations and detrimental to the proper functioning of the oscillator .

Le choix du silicium permet de surcroît d'insérer au balancier des gravures, des décors, et d'effectuer une structuration de surface.The choice of silicon allows moreover to insert the pendulum engravings, decorations, and perform a surface structuring.

De façon préférée, chacune des parties 10,11, de chaque masselotte 7 est réalisée en un matériau, qui est un métal lourd, ou du bronze au béryllium, ou de l'or ou du platine ou du tantale ou du molybdène, ou un de leurs oxydes ou de leurs nitrures, ou un de leurs alliages, ou un des complexes développés sur leurs bases.Preferably, each of the portions 10, 11, of each weight 7 is made of a material, which is a heavy metal, or beryllium bronze, or gold or platinum or tantalum or molybdenum, or a their oxides or their nitrides, or one of their alloys, or one of the complexes developed on their bases.

De façon préférée, quand la deuxième partie 11 est une vis réglante 12, il est nécessaire de concilier le très faible diamètre de la partie filetée, typiquement compris entre 0,20 et 0,30 mm environ, avec un couple de vissage/dévissage qui permette d'assurer son bon maintien dans le plot 10, ce couple étant notamment choisi entre 0,3 et 1,8 N.mm. Il faut alors disposer d'un couple de matériaux pour le plot 10 et la vis réglante 12, qui assure à la fois la tenue de la vis 12 sans dévissage, et qui interdise sa rupture à la valeur maximale du couple. Dans une réalisation préférée, ce couple de matériaux est constitué par du bronze au béryllium de type CuBe d'une part, et d'un alliage d'or, au moins de 14 carats, d'autre part. De préférence le plot 10 est en bronze au béryllium de type CuBe et la vis réglante 12 est réalisée en alliage d'or.Preferably, when the second portion 11 is a control screw 12, it is necessary to reconcile the very small diameter of the threaded portion, typically between 0.20 and 0.30 mm, with a screwing / unscrewing torque which allows to ensure its good maintenance in the stud 10, this pair being chosen in particular between 0.3 and 1.8 N.mm. It is then necessary to have a pair of materials for the stud 10 and the regulating screw 12, which ensures both the holding of the screw 12 without unscrewing, and which prevents its breaking at the maximum value of the torque. In a preferred embodiment, this pair of materials consists of beryllium bronze of CuBe type on the one hand, and a gold alloy, at least 14 karat, on the other hand. Preferably the stud 10 is beryllium bronze CuBe type and the adjusting screw 12 is made of gold alloy.

Enfin, pour une utilisation optimale, et pour augmenter encore le facteur de qualité, il convient de diminuer les frottements au niveau du pivot de ce balancier. Précisément, la masse et l'inertie réduite du balancier selon l'invention autorisent la confection d'un pivot de diamètre inférieur de 30 à 40% par rapport aux pivots usuels, ce qui a une très grande influence sur le niveau des frottements. Les trois variantes présentées sont conjuguées à un pivot d'un diamètre de 0.05 mm environ.Finally, for optimal use, and to further increase the quality factor, it is necessary to reduce the friction at the pivot of this beam. Precisely, the mass and reduced inertia of the balance according to the invention allow the manufacture of a lower diameter of the pivot of 30 to 40% relative to the usual pivots, which has a very great influence on the level of friction. The three variants presented are conjugated to a pivot with a diameter of approximately 0.05 mm.

A titre d'exemple, pour un balancier 1 d'un diamètre d'environ 7 mm et d'épaisseur de serge d'environ 0,20 mm, comportant une serge monobloc en silicium, et 4 plots 10 en CuBe ou en alliage d'or ainsi que 4 vis réglantes 12 en alliage d'or, les masses et inerties par rapport à l'axe de balancier 3, pour les trois variantes de réalisation représentées sur les figures sont les suivantes :

  • Masse serge 6,8 à 11,3 mg
  • Inertie serge 0,41 à 0,92 mg.cm2
  • Masse plots 3,1 à 17,2 mg
  • Inertie plots 0,24 à 1,13 mg.cm2
  • Masse vis 2,4 à 6,2 mg
  • Inertie vis 0,23 à 0,64 mg.cm2
  • Masse ensemble 20,6 à 26,9 mg
  • Inertie ensemble 1,80 à 1,81 mg.cm2
By way of example, for a rocker 1 with a diameter of about 7 mm and a serge thickness of about 0.20 mm, comprising a monobloc serge of silicon, and 4 pads of CuBe or alloy of Or as well as 4 adjusting screws 12 in gold alloy, the masses and inertias with respect to the balance shaft 3, for the three embodiments shown in the figures are the following:
  • Mass serge 6.8 to 11.3 mg
  • Inertia serge 0.41 to 0.92 mg.cm 2
  • Mass plots 3.1 to 17.2 mg
  • Inertia plots 0.24 to 1.13 mg.cm 2
  • Mass screw 2.4 to 6.2 mg
  • Inertia screws 0.23 to 0.64 mg.cm 2
  • Mass together 20.6 to 26.9 mg
  • Inertia together 1.80 to 1.81 mg.cm 2

On notera, encore, que, selon l'invention, le balourd des masselottes 7 se décompose entre une partie de balourd qui est fixe, et une partie du balourd qui est mobile et fait office de réglage. Ainsi, dans la deuxième variante de la figure 2, les plots 10 constituent la partie réglante du balourd, et les vis 12 sont fixes en translation et constituent la partie fixe du balourd. Dans la troisième variante de la figure 4, c'est l'inverse : les plots 10 constituent la partie fixe du balourd, et les vis 12 en constituent la partie réglante.It will be noted, again, that, according to the invention, the unbalance of the weights 7 is decomposed between an unbalance part which is fixed, and a part of the unbalance which is movable and serves as an adjustment. So, in the second variant of the figure 2 , the studs 10 constitute the regulating part of the unbalance, and the screws 12 are fixed in translation and constitute the fixed part of the unbalance. In the third variant of the figure 4 it is the opposite: the studs 10 constitute the fixed part of the unbalance, and the screws 12 constitute the regulating part.

De préférence, pour une inertie donnée, la partie réglante est toujours de la même valeur. Dans les exemples ci-dessus, l'inertie de la partie réglante est voisine de 0,25 mg.cm2.Preferably, for a given inertia, the regulating part is always of the same value. In the examples above, the inertia of the regulating portion is close to 0.25 mg.cm 2 .

Le facteur de qualité mesuré est voisin de 500 pour les trois variantes. Ce facteur de qualité est obtenu par la conjugaison d'un spiral silicium et d'un balancier selon l'invention.The quality factor measured is close to 500 for the three variants. This quality factor is obtained by the combination of a silicon balance spring and a balance according to the invention.

La conjugaison entre d'une part ce facteur de qualité élevé, et d'autre part les possibilités de réglage et d'ajustement offertes par les plots 10 et les vis réglantes 12, qui, outre leurs fonctions de réglage propre, remplissent une fonction nouvelle, qui est de servir de plate-forme d'usinage pour rajouter ou enlever de la matière dans les opérations d'ajustement d'équilibrage et de réglage de fréquence, permet l'élimination de la raquetterie.The combination between, on the one hand, this high quality factor, and, on the other hand, the adjustment and adjustment possibilities offered by the studs 10 and the adjusting screws 12, which, in addition to their own adjustment functions, fulfill a new function. , which is to serve as a machining platform for adding or removing material in the balancing and tuning adjustment operations, allows the elimination of the racking.

Les buts que se proposait d'atteindre l'invention sont parfaitement atteints avec de telles valeurs. En particulier, un tel balancier avec une inertie inférieure à 2 mg.cm2, ici de1,80 à 1,81 mg.cm2, est tout à fait approprié pour une utilisation à 10 Hz ou davantage.The aims which the invention intended to attain are perfectly attained with such values. In particular, such a balance with an inertia less than 2 mg.cm 2 , here from 1.80 to 1.81 mg.cm 2 , is entirely suitable for use at 10 Hz or more.

Les possibilités de réglage et d'équilibrage sont de surcroît excellentes.The adjustment and balancing possibilities are also excellent.

Le réglage et l'ajustement du balancier sont très précis, et permettent au balancier d'être utilisé dans un oscillateur à haute fréquence, 10 Hz ou davantage.The adjustment and adjustment of the balance are very precise, and allow the balance to be used in a high frequency oscillator, 10 Hz or more.

La conception du balancier autorise un ajustement très précis de la fréquence d'oscillation du balancier-spiral dans lequel il est intégré.The design of the balance allows a very precise adjustment of the oscillation frequency of the sprung balance in which it is integrated.

L'invention comporte encore un balancier-spiral incorporant au moins un tel balancier 1 selon l'invention.The invention also comprises a sprung balance incorporating at least one such balance 1 according to the invention.

L'invention concerne encore une pièce d'horlogerie incorporant au moins un tel balancier-spiral ou au moins un tel balancier 1.The invention also relates to a timepiece incorporating at least one such sprung balance or at least one such rocker 1.

Claims (14)

  1. Timepiece balance (1) with inertia adjustment for adjusting the oscillation frequency of the balance, including a hub (2) arranged to cooperate with a balance staff (3) perpendicular to a plane (4) of the balance, and a peripheral, continuous or discontinuous felloe (5), connected to said hub (2) by at least one junction surface (6), said balance (1) further including at least one inertia-block (7), said at least one inertia-block (7) being placed on said felloe (5) in a housing (8) at the periphery of said felloe (5) for receiving said inertia-block, and wherein:
    - said at least one inertia-block (7) includes a guide means (9) having a complementary profile to a complementary guide means (9A) comprised in said housing (8),
    - each said at least one inertia-block (7) includes at least two parts (10, 11) adjustable in translation relative to each other in a parallel plane to said plane (4) of said balance (1), and one of said parts (10, 11) is immobile in translation relative to said felloe (5),
    - each of said parts (10, 11) of said at least one inertia-block (7) is made of a material which is denser than a first material forming said felloe (5),
    characterized in that said at least one inertia-block (7) is held in said housing (8) by holding means (13) which are elastic holding means arranged to allow the insertion of said at least one inertia-block (7) into said housing (8) and to prevent the removal thereof.
  2. Balance (1) according to claim 1, characterized in that said elastic holding means is formed by a snap fit means (14) which is comprised in said at least one inertia-block (7) and is arranged to cooperate in an elastic manner with a complementary snap fit means (14A) comprised in said felloe (5), said snap fit means (14) means being formed by at least one elastic lip (15) comprised in said at least one inertia-block (7), said at least one elastic lip (15) being arranged to bend into a compression position during a first insertion travel of said at least one inertia-block (7) into said housing (8) and to allow said insertion, and to relax in a relaxed position in a recess (16) comprised in said housing (8) and forming said complementary snap fit means (14A), in an operating position or in a second adjustment travel of said at least one inertia-block (7), said second adjustment travel following said first insertion travel, said at least one elastic lip (15) including a stop surface (17) in said relaxed position arranged to abut on a complementary stop surface (17A) arranged in turn in said housing (8).
  3. Balance (1) according to claim 1, characterized in that said elastic holding means is formed by a snap fit means (14) which is comprised in said at least one inertia-block (7) and is arranged to cooperate in an elastic manner with a complementary snap fit means (14A) comprised in said felloe (5), said snap fit means (14) means being formed by at least one elastic lip (15) comprised in said housing (8), said at least one elastic lip (15) being arranged to bend into a compression position during a first insertion travel of said at least one inertia-block (7) into said housing (8) and to allow said insertion, and to relax in a relaxed position in a recess (16) comprised in said at least one inertia-block (7) and forming said complementary snap fit means (14A), in an operating position or in a second adjustment travel of said at least one inertia-block (7), said second adjustment travel following said first insertion travel, said at least one elastic lip (15) including a stop surface (17) in said relaxed position arranged to abut on a complementary stop surface (17A) arranged in said at least one inertia-block (7).
  4. Balance (1) according to any of the preceding claims, characterized in that said at least one inertia-block (7) includes a first part (10) including said guide means (9), and a second part (11) formed by an adjustment screw (12), whose external thread, or respectively internal thread, cooperates with an internal thread, respectively an external thread, comprised in said first part (10), and whose said external thread, respectively said internal thread, is remote from said felloe (5) or from said junction surface (6).
  5. Balance (1) according to claim 4, characterized in that screwing in or unscrewing said adjustment screw (12) moves one end of said screw (12) closer to or further away from said felloe (5), or inversely, said first part (10) being immobile in translation.
  6. Balance (1) according to claim 4, characterized in that said at least one inertia-block (7) includes at least two inertia adjustment screws (12).
  7. Balance (1) according to any of the preceding claims, characterized in that the balance includes at least two inertia-blocks (7A, 7B) each placed on said felloe (5) in a housing (8A, 8B), comprised in the periphery of said felloe (5) for receiving said inertia-blocks, each including a guide means having a complementary profile to a complementary guide means contained in said housing (8A, 8B), each including at least two parts (10, 11) adjustable in translation relative to each other in a parallel plane to said plane (4) of said balance (1), and each of said parts (10, 11) of each of said inertia-blocks (7A, 7B) being made of a material which is denser than a first material forming said felloe (5).
  8. Balance (1) according to the preceding claim, characterized in that said inertia-blocks (7A, 7B) are in symmetrical pairs relative to a plane passing through said hub (2) and said balance staff (3), and/or are in symmetrical pairs relative to said hub (2).
  9. Balance (1) according to any of the preceding claims, characterized in that each said inertia-block (7) includes at least one flat surface formed, either of a parallel surface (26) to said plane (4) of the balance, or of an end surface (27) perpendicular to said plane (4) of the balance and to a radial line derived from said balance staff (3), said flat surface being arranged to be able to serve as a machining platform for adding or removing material in poising adjustment or frequency setting operations, and each said inertia-block (7) includes, in every section perpendicular to said plane (4) of the balance and to a plane passing through said balance staff (3), a curved and/or sloping aerodynamic profile (28) to reduce air friction.
  10. Balance (1) according to any of the preceding claims, characterized in that said junction surface (6) is pierced and includes through pockets (29), separated by ribs (30), over the entire thickness of said junction surface (6), and/or blind, non-through pockets (31) over only part of the thickness of said junction surface (6).
  11. Balance (1) according to any of the preceding claims, characterized in that said felloe (5) is made in one piece with said junction surface (6) and said hub (2) of silicon or a micromachinable material or quartz or in accordance with the LIGA process.
  12. Balance (1) according to any of the preceding claims, characterized in that each of said parts of said at least one inertia-block (7) is made of a material which is a heavy metal or bronze with beryllium or gold or platinum or tantalum or molybdenum or an oxide or nitride thereof, or an alloy thereof, or a complex compound developed on the basis thereof.
  13. Sprung balance incorporating at least one balance (1) according to any of the preceding claims.
  14. Timepiece including at least one sprung balance according to the preceding claim, or at least one balance (1) according to any of claims 1 to 12.
EP13184692.5A 2010-06-11 2010-06-11 High frequency balance wheel for timepiece Active EP2677369B1 (en)

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EP2410386B1 (en) * 2010-07-19 2018-10-03 Nivarox-FAR S.A. balance wheel with inertia adjustment with insert
JP6231264B2 (en) * 2011-07-29 2017-11-15 ロレックス・ソシエテ・アノニムRolex Sa Balance wheel assembly with optimized pivoting
EP2607970B1 (en) * 2011-12-22 2018-02-07 The Swatch Group Research and Development Ltd. Method for improving the pivoting of a mobile device
EP3376306A1 (en) * 2011-12-22 2018-09-19 The Swatch Group Research and Development Ltd Mobile for time-keeping or scientific instrument
CH707527A2 (en) * 2013-01-25 2014-07-31 Isa France Sas Piece oscillating timepiece as rotor winding or balance.
CH708657A1 (en) 2013-10-02 2015-04-15 Sercalo Microtechnology Ltd Pendulum to clockwork adjustable inertia moment.
EP2990882B1 (en) * 2014-08-26 2020-01-15 Nivarox-FAR S.A. Balance with inertia adjustment.
EP3502786A1 (en) * 2017-12-22 2019-06-26 The Swatch Group Research and Development Ltd Balance for timepiece and method for manufacturing such a balance
EP3796102B1 (en) * 2017-12-22 2022-04-20 The Swatch Group Research and Development Ltd Method for manufacturing a balance for a timepiece
EP3647883A1 (en) * 2018-11-05 2020-05-06 CSEM Centre Suisse D'electronique Et De Microtechnique SA Timepiece balance
EP3671364A1 (en) * 2018-12-17 2020-06-24 Nivarox-FAR S.A. Elastic holding member for fixing a timepiece component on a support element

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CH16676A (en) * 1898-05-11 1899-01-15 Henri Sandoz Watch balance with variable moment of inertia
CH276466A (en) * 1949-01-27 1951-07-15 Calame Ariste Watch balance with adjustable moment of inertia.
CH339573A (en) * 1957-06-24 1959-06-30 Henri Sandoz & Fils Balance wheel for timepiece
FR1275357A (en) 1960-12-01 1961-11-03 Straumann Inst Ag Balance wheel for watches
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