EP1605323A2 - Spiral spring for mechanical clockwork - Google Patents

Spiral spring for mechanical clockwork Download PDF

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Publication number
EP1605323A2
EP1605323A2 EP05405216A EP05405216A EP1605323A2 EP 1605323 A2 EP1605323 A2 EP 1605323A2 EP 05405216 A EP05405216 A EP 05405216A EP 05405216 A EP05405216 A EP 05405216A EP 1605323 A2 EP1605323 A2 EP 1605323A2
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EP
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Prior art keywords
curve
spiral
assembly
hairspring
mechanical clockwork
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EP05405216A
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German (de)
French (fr)
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EP1605323A3 (en
Inventor
Henri-Michel Guignard
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Coredem SA
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Coredem SA
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    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/066—Manufacture of the spiral spring

Definitions

  • the present invention aims to eliminate or at least greatly reduce the disadvantages of non-concentric displacements of the flat hairspring at its extensions or contractions.
  • This invention relates to the movements mechanical timepieces and more particularly those used in wristwatches.
  • the precision of the mechanical clockwork movement depends on the balance-spring assembly which constitutes the regulatory body.
  • This set is a mechanical resonator that oscillates at a frequency of for example 4 Hz.
  • FIGS. 1, 2 and 3 represent as an example a set Spiral balance of a traditional clockwork movement partially represented.
  • Figure 1 is a perspective view from above, Figure 2 a section and Figure 3 a view of the whole sprung balance.
  • a curve 10 usually called the Breguet curve above the general plane of the hairspring and for the case where he does not have enough height he is satisfied with a flat hairspring without particular curve and therefore applies the theories of the point of attachment.
  • These theories partially correct the defects induced during oscillations of the flat hairspring; however, to achieve a correct result it is necessary to implement complex and costly pairing operations between the balance and the hairspring, in order to place the point of attachment of the latter in a specific place.
  • This section different straight is obtained especially by folding the blade on itself in the direction of its length, in order to obtain, at the place of the folded part, a rigidity greater than that of the rest of the hairspring.
  • the document proposes two folded parts, one located near the ferrule to force the inner half of the turns to develop concentrically and the other being located near the peak to force this time the outer half of the turns to also develop concentrically.
  • the proposals of this patent are interesting and go in the right direction, but it will be understood that problems with folding makes this unworkable solution in the framework of a traditional production of spirals metal strapped and heat-treated together.
  • the present invention relates to a hairspring for mechanical watch movement characterized in that it is provided with a peripheral outer curve located in the same plane and that the rigidity of this curve is such that the central part of the whole thus constituted develops concentrically during its oscillations.
  • Figure 9 shows schematically this set in plan. It consists of a curve outside 10 going from point 15 to the peak 8 which envelops the central portion 14 on an angle ⁇ more or less equal to 270 °.
  • This curve 10 has 3 elbows 16, 17 and 18 which are similar to those existing on the traditional Breguet spiral curve designated at the Figure 7 in 11, 12 and 13. These elbows are useful to the specialist who can once all balance-spiral placed in the movement to modify them and thus obtain the best centering possible turns of the central part of the whole.
  • the thickness of this curve is reinforced in the zones 19, 20 and 21.
  • FIG. 10 shows, according to the above, an embodiment for which the curve is made separately from the central part, both elements being fixed to each other in point 15 by gluing or any other means likely to achieve this fixation.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

The hairspring has a peripheral exterior curve (10) situated in a plane of the hairspring and has a specific rigidity, such that a central part (14) of a curve-hairspring assembly is constituted of concentric displacements during its oscillation. The curve presents elbows (16-18) for centering a central part of the assembly during the assembly operation in a watch movement.

Description

La présente invention a pour but de supprimer ou pour le moins de fortement réduire les inconvénients liés aux déplacements non concentrique du spiral plat lors de ses extensions ou de ses contractions. Cette invention concerne dans les mouvements d'horlogerie mécanique et plus particulièrement ceux utilisés dans les montres-bracelet. La précision du mouvement d'horlogerie mécanique dépend de l'ensemble balancier-spiral qui constitue l'organe régulateur. Cet ensemble est un résonateur mécanique qui oscille à une fréquence de par exemple 4 Hz. Les figures 1, 2 et 3 représentent à titre d'exemple un ensemble balancier-spiral d'un mouvement d'horlogerie traditionnel représenté partiellement. La figure 1 est une vue en perspective de dessus, la figure 2 une coupe et la figure 3 une vue de l'ensemble balancier-spiral. Ces différentes figures nous permettent de voir le balancier 1 chassé et rivé sur son axe 2, le spiral 3 lié à la virole 4 elle-même chassée sur l'axe 2, le pont de balancier 5 qui contient le palier antichoc supérieur 6 de l'axe 2. Nous savons que plusieurs phénomènes sont susceptibles d'influencer la précision du mouvement d'horlogerie et que parmi eux, ceux liés à la gravitation sont particulièrement importants. En effet, ces phénomènes ont une incidence sur la précision du mouvement d'horlogerie mécanique en fonction, d'une part des positions variables dans lesquelles se trouve notamment la montre-bracelet placée au poignet de son utilisateur et, d'autre part des positions successives des défauts d'équilibre ou balourds issus des écarts dimensionnels dus à la production et de ceux induits lors de des oscillations de l'ensemble balancier-spiral. Ce dernier point est particulièrement important pour les mouvements d'horlogerie munis d'un spiral usuellement appelé spiral plat et donc dépourvu de courbe terminale dite de type Breguet. Nous citerons pour référence la Théorie de la construction horlogère pour ingénieur, Volume : Mécanique, chapitre 5 page 67 à 142; édité par L'Ecole d'ingénieurs de L'Arc jurassien CH 2400 le Locle.The present invention aims to eliminate or at least greatly reduce the disadvantages of non-concentric displacements of the flat hairspring at its extensions or contractions. This invention relates to the movements mechanical timepieces and more particularly those used in wristwatches. The precision of the mechanical clockwork movement depends on the balance-spring assembly which constitutes the regulatory body. This set is a mechanical resonator that oscillates at a frequency of for example 4 Hz. FIGS. 1, 2 and 3 represent as an example a set Spiral balance of a traditional clockwork movement partially represented. Figure 1 is a perspective view from above, Figure 2 a section and Figure 3 a view of the whole sprung balance. These different figures allow us to see the pendulum 1 chased and riveted on its axis 2, the spiral 3 linked to the shell 4 itself driven on the axis 2, the pendulum bridge 5 which contains the upper anti-shock bearing 6 of axis 2. We know that several phenomena are likely to influence the accuracy of the watch movement and that among them, those related to the gravitation are particularly important. Indeed, these phenomena have an impact on the accuracy of the mechanical clockwork movement in function, on the one hand variable positions in which is notably the wristwatch placed on the wrist of its user and, on the other hand, successive positions of equilibrium defects or imbalances resulting from deviations dimensional factors due to production and those induced during oscillations of the whole sprung balance. This last point is particularly important for movements timepieces with a hairspring usually called a flat hairspring and therefore devoid of a curve term called Breguet type. We will quote for reference the Theory of construction watchmaker for engineers, Volume: Mécanique, chapter 5 page 67 to 142; edited by L'Ecole engineers of the Jura Arc CH 2400 Le Locle.

Le lecteur comprendra que pour décrire l'objet de l'invention nous considérons dans l'exposé suivant le spiral dit Breguet à courbe terminale réalisée au-dessus de son plan principal et le spiral dépourvu de cette courbe dénommé usuellement spiral plat. Les figure 4,5 et 6 représentent un spiral plat dans 3 positions différentes. La figure 4 représente un spiral 3 au repos fixé au centre à la virole 4 et à l'extérieur au piton 8, à l'extrémité de la courbe 7. Dans cette position, les spires du spiral sont approximativement concentriques. La figure 5 représente un spiral en contraction, pour lequel les spires se trouvent contractées et notamment resserrées dans la partie opposée à la courbe 7. La figure 6 représente un spiral en extension, pour lequel les spires se trouvent dilatées, et notamment espacées dans la partie opposée à la courbe 7. Les balourds ainsi engendrés induisent des défauts d'isochronisme qui font que l'emploi du spiral plat n'est pas satisfaisant pour les montres qui ont pour ambition de représenter l'horlogerie mécanique de haute qualité. Pour faciliter la compréhension de la suite, nous analyserons les trois principes relatifs à l'isochronisme des ensembles balanciers-spiraux énoncés en 1861 par Edouard Philips, soit :

  • Le centre de gravité du spiral au repos doit se trouver au centre du spiral, c'est-à-dire sur l'axe de balancier
  • le centre de gravité du spiral en mouvement doit rester sur l'axe de balancier
  • le spiral ne doit exercer aucune pression sur les pivots de l'axe de balancier.
The reader will understand that to describe the object of the invention we consider in the following description the so-called Breguet spiral terminal curve made above its main plane and the spiral devoid of this curve usually called spiral flat. Figures 4,5 and 6 show a flat hairspring in 3 different positions. Figure 4 shows a balance spring 3 at rest fixed in the center to the shell 4 and outside the pin 8 at the end of the curve 7. In this position, the coils of the spiral are approximately concentric. FIG. 5 represents a spiral in contraction, for which the turns are contracted and in particular narrowed in the part opposite to the curve 7. FIG. 6 represents a spiral in extension, for which the turns are dilated, and in particular spaced in the opposite part to the curve 7. The imbalances thus generated induce isochronism defects that make the use of the flat spiral is not satisfactory for watches that have the ambition to represent the mechanical watch of high quality. To facilitate the understanding of the sequence, we will analyze the three principles relating to the isochronism of the balance-spiral sets enunciated in 1861 by Edouard Philips, namely:
  • The center of gravity of the hairspring at rest must be in the center of the hairspring, that is to say on the balance shaft
  • the center of gravity of the moving spiral must remain on the balance shaft
  • the hairspring must not exert any pressure on the pivots of the balance shaft.

L'homme de l'art se satisfait de ces règles et réalise pour les satisfaire quand il dispose de suffisamment de place en hauteur, comme le montrent les figures 7 et 8, une courbe 10 généralement appelée courbe Breguet située au-dessus du plan général du spiral et pour le cas où il ne dispose pas de suffisamment de hauteur il se contente d'un spiral plat sans courbe particulière et applique dès lors les théories du point d'attache. Ces théories permettent de corriger partiellement les défauts induits lors des oscillations du spiral plat ; cependant, pour parvenir à un résultat correcte il est nécessaire de mettre en oeuvre de complexes et coûteuses opérations d'appairage entre le balancier et le spiral, ceci afin de placer le point d'attache de ce dernier à un endroit précis.Those skilled in the art are satisfied with these rules and realize to satisfy them when he has enough space in height, as shown in FIGS. 7 and 8, a curve 10 usually called the Breguet curve above the general plane of the hairspring and for the case where he does not have enough height he is satisfied with a flat hairspring without particular curve and therefore applies the theories of the point of attachment. These theories partially correct the defects induced during oscillations of the flat hairspring; however, to achieve a correct result it is necessary to implement complex and costly pairing operations between the balance and the hairspring, in order to place the point of attachment of the latter in a specific place.

A propos des trois conditions de Philips nous pouvons lire dans le Tome II de la théorie générale d'horlogerie de Léopold Defossez, 1952 (page 340): "Ces trois conditions ne sont pas incompatibles; dès que l'une d'elles est remplie, les deux autres le sont aussi ou à peu près. Il suffit donc de chercher à munir le spiral de courbes qui ramène son centre de gravité au repos sur l'axe de balancier", et, dans les conclusions à propos des courbes Breguet page 350, "ainsi les courbes terminales qui remplissent les conditions 1 et 2 ramènent le centre de gravité du spiral au repos sur l'axe de balancier et l'y maintiennent pendant la déformation; elles obligent le spiral à se développer concentriquement, c'est-à-dire sans exercer de pressions sur les pivots du balancier".About the three conditions of Philips we can read in Volume II of the theory General of Watchmaking by Léopold Defossez, 1952 (page 340): "These three conditions are not incompatible; as soon as one of them is filled, the other two are also filled or roughly. So just look to bring the spiral curves that brings his center of gravity resting on the pendulum axis ", and, in the conclusions about the curves Breguet page 350, "thus the terminal curves that fulfill the conditions 1 and 2 bring the center of gravity of the balance spring to rest on the balance shaft and maintain it there during the deformation; they force the spiral to develop concentrically, that is to say without exerting pressure on the pivots of the pendulum ".

Nous considérons pour notre part qu'il est insuffisant, voire erroné de s'intéresser au centre de masse ou centre de gravité du spiral de cette manière simplifiée, ceci sachant que le spiral est encastré au piton 8 et que la masse de la partie extérieure du spiral n'intervient que progressivement. Le spiral est en fait supporté par cet encastrement et l'on peut dès lors affirmer que maintenir le spiral concentrique pendant ses oscillation est l'objectif essentiel à atteindre pour minimiser les défauts d'isochronismes.For our part, we consider it insufficient or even wrong to be interested in center of mass or center of gravity of the spiral in this simplified way, this knowing that the hairspring is recessed at pin 8 and that the mass of the outer part of the hairspring only intervenes gradually. The hairspring is actually supported by this recess and it can therefore be said that maintaining the concentric spiral during its oscillation is the essential objective to be achieved in order to minimize isochronism defects.

Observons un spiral Breguet et comparons son fonctionnement avec ce que fit Frodsham qui fut le premier à proposer une solution permettant d'obliger le spiral à se développer concentriquement. Frodsham a imaginé d'attacher l'extrémité extérieure du spiral à un ressort très flexible de telle sorte que ce ressort suive plus ou moins le mouvement de la spire extérieure du spiral au point de leur liaison. En fait la courbe extérieure du spiral Breguet se comporte de cette manière, son extrémité 11 se déplace simultanément tangentiellement et radialement, elle accompagne le reste du spiral dans son développement concentrique. Sachant que l'influence de la masse de la partie extérieure du spiral est minimisée par son encastrement, nous pouvons admettre que la courbe 10 du spiral Breguet n'a pas de rapport avec la position de son propre centre de masse, mais que sa forme et que sa longueur permettent en fait d'augmenter la rigidité de la partie terminale extérieure du spiral et de satisfaire ainsi au besoin de développement concentrique de sa partie centrale. La pratique a démontré que pour réaliser cette condition ladite courbe devait être construite sur environ les 270° précédants son encastrement au piton et que la rigidité de cette courbe devait être environ 1,5 fois supérieure à celle d'une spire qui prolongerait le spiral du même point de départ 11 et sur le même secteur d'environ 270°.Let's look at a Breguet hairspring and compare how it works with what Frodsham did who was the first to propose a solution to force the hairspring to develop concentrically. Frodsham imagined attaching the outer end of the hairspring to a very flexible spring so that this spring follows more or less the movement of the outer turn of the spiral at the point of their connection. In fact the outer curve of the spiral Breguet behaves in this way, its end 11 moves simultaneously tangentially and radially, it accompanies the rest of the spiral in its concentric development. Knowing that the influence of the mass of the outer part the spiral is minimized by its embedding, we can admit that the curve 10 of Breguet spiral is unrelated to the position of its own center of mass, but that its shape and its length actually increase the rigidity of the part outer end of the hairspring and thereby satisfy the need for further development concentric of its central part. Practice has shown that to achieve this condition said curve had to be built on about 270 ° preceding his embedded in the piton and that the rigidity of this curve should be about 1.5 times greater than that of a turn that would extend the hairspring from the same starting point 11 and on the same sector of about 270 °.

Pour obtenir le même résultat pour un spiral plat, il est nécessaire de placer la courbe terminale à l'extérieur du spiral dans sa périphérie. Dans ce cas, au contraire du spiral Breguet la courbe ne peut pas être plus courte, elle sera en fait plus longue de l'ordre de 50 %. Elle sera donc d'une rigidité insuffisante et elle ne pourra pas être raisonnablement réalisée en utilisant la partie finale d'un spiral métallique traditionnel laminé. A ce sujet, nous citerons le brevet CH-A-327796, qui revendique: "Un spiral plat dont au moins une partie de la lame présente une section droite différente de celle du reste de la lame, en vue d'obtenir, lors du fonctionnement, un développement concentrique du spiral. Cette section droite différente est obtenue notamment par pliage de la lame sur elle-même dans le sens de sa longueur, dans le but d'obtenir, à l'endroit de la partie pliée, une rigidité supérieure à celle du reste du spiral". Le document propose deux parties pliées, l'une se situant près de la virole pour obliger la moitié intérieure des spires à se développer concentriquement et l'autre se situant près du piton pour obliger cette fois-ci la moitié extérieure des spires à se développer également concentriquement. Les propositions de ce brevet sont intéressantes et vont dans le bon sens, mais l'on comprendra que les problèmes liés aux pliages rend cette solution inexploitable dans le cadre d'une production traditionnelle de spiraux métalliques estrapadés et traités thermiquement ensemble.To obtain the same result for a flat hairspring, it is necessary to place the curve terminal outside the spiral in its periphery. In this case, unlike the hairspring Breguet the curve can not be shorter, it will actually be longer in the order of 50%. It will therefore be of insufficient rigidity and it can not be reasonably made using the final part of a traditional rolled metal spiral. On this subject, we will mention the patent CH-A-327796, which claims: "A flat spiral of which at least one part of the blade has a cross section different from that of the rest of the blade, in view to obtain, during operation, a concentric development of the spiral. This section different straight is obtained especially by folding the blade on itself in the direction of its length, in order to obtain, at the place of the folded part, a rigidity greater than that of the rest of the hairspring. "The document proposes two folded parts, one located near the ferrule to force the inner half of the turns to develop concentrically and the other being located near the peak to force this time the outer half of the turns to also develop concentrically. The proposals of this patent are interesting and go in the right direction, but it will be understood that problems with folding makes this unworkable solution in the framework of a traditional production of spirals metal strapped and heat-treated together.

Pour obtenir une courbe extérieure d'une rigidité suffisante, il suffit en fait de faire varier l'épaisseur de celle-ci. En employant des techniques telles que par exemple, le découpage, l'usinage au fil, la découpe au laser ou chimique et le laminage impliquant des variations d'épaisseur ; nous pouvons envisager, de produire séparée de la partie centrale du spiral ou non, une courbe adéquate.To obtain an external curve of sufficient rigidity, it suffices to vary the thickness of it. By employing techniques such as, for example, cutting, wire machining, laser or chemical cutting and rolling involving variations thick; we can consider, produce separate from the central part of the spiral or not, a proper curve.

La présente invention a pour objet un spiral pour mouvement d'horlogerie mécanique caractérisé par le fait qu'il est muni d'une courbe extérieur périphérique située dans le même plan et que la rigidité de cette courbe est telle que la partie centrale de l'ensemble ainsi constitué se développe concentriquement lors de ses oscillations.The present invention relates to a hairspring for mechanical watch movement characterized in that it is provided with a peripheral outer curve located in the same plane and that the rigidity of this curve is such that the central part of the whole thus constituted develops concentrically during its oscillations.

La figure 9 présente schématisé cet ensemble en plan. Il est constitué d'une courbe extérieur 10 allant du point 15 au piton 8 qui enveloppe la partie centrale 14 sur un angle β plus ou moins égal à 270°. Cette courbe 10 présente 3 coudes 16, 17 et 18 qui sont comparables à ceux existants sur la courbe traditionnelle du spiral Breguet désignés à la figure 7 en 11, 12 et 13. Ces coudes sont utiles au spécialiste qui peut une fois l'ensemble balancier-spiral placé dans le mouvement les modifier et obtenir ainsi le meilleur centrage possible des spires de la partie centrale de l'ensemble. Afin de répondre à la nécessité de renforcer la rigidité de la courbe 10, l'épaisseur de celle-ci est renforcée dans les zones 19, 20 et 21.Figure 9 shows schematically this set in plan. It consists of a curve outside 10 going from point 15 to the peak 8 which envelops the central portion 14 on an angle β more or less equal to 270 °. This curve 10 has 3 elbows 16, 17 and 18 which are similar to those existing on the traditional Breguet spiral curve designated at the Figure 7 in 11, 12 and 13. These elbows are useful to the specialist who can once all balance-spiral placed in the movement to modify them and thus obtain the best centering possible turns of the central part of the whole. In order to meet the need to to reinforce the rigidity of the curve 10, the thickness of this curve is reinforced in the zones 19, 20 and 21.

La figure 10 présente, selon ce qui précède, une exécution pour laquelle la courbe extérieure est fabriquée séparément de la partie centrale, les deux éléments étant fixés l'un à l'autre au point 15 par collage ou tout autres moyens susceptibles de réaliser cette fixation.FIG. 10 shows, according to the above, an embodiment for which the curve is made separately from the central part, both elements being fixed to each other in point 15 by gluing or any other means likely to achieve this fixation.

Claims (6)

La présente invention a pour objet un spiral pour mouvement d'horlogerie mécanique caractérisé par le fait qu'il est muni d'une courbe extérieure périphérique située dans le plan du spiral et que la rigidité de cette courbe est telle que la partie centrale de l'ensemble spiral-courbe ainsi constitué se développe concentriquement lors de ses oscillations.The subject of the present invention is a spiral for a mechanical clockwork movement characterized in that it is provided with a peripheral external curve situated in the plane of the spiral and that the rigidity of this curve is such that the central part of the spiral-curved assembly thus constituted concentrically develops during its oscillations. Ensemble spiral-courbe pour mouvement d'horlogerie mécanique selon la revendication 1 caractérisé par le fait que la courbe extérieure présente des coudes facilitant le centrage de la partie centrale de l'ensemble spiral-courbe lors de l'assemblage dans le mouvement d'horlogerie.Spiral-curve assembly for a mechanical clockwork movement according to Claim 1, characterized in that the outer curve has elbows facilitating the centering of the central part of the spiral-curved assembly during assembly in the watch movement. . Ensemble spiral-courbe pour mouvement d'horlogerie mécanique selon la revendication 1 caractérisé par le fait que la courbe extérieure présente des variations de section de tel sorte que sa rigidité permette à la partie centrale de l'ensemble spiral-courbe de rester concentrique lors des oscillations.Spiral-curve assembly for mechanical clockwork according to Claim 1, characterized in that the outer curve has sectional variations so that its rigidity allows the central portion of the spiral-curve assembly to remain concentric during oscillations. Ensemble spiral-courbe pour mouvement d'horlogerie mécanique selon la revendication 3 caractérisé par le fait que la rigidité de la courbe extérieure et principalement obtenue par l'augmentation de sa section aux endroits où se situent les coudes de ladite courbe.Spiral-curve assembly for a mechanical clockwork movement according to claim 3 characterized in that the rigidity of the outer curve and mainly obtained by increasing its section at the locations where the elbows of said curve. Ensemble spiral-courbe pour mouvement d'horlogerie mécanique selon la revendication 1 caractérisé par le fait qu'il est constitué d'une seule pièce.Spiral-curve assembly for a mechanical clockwork movement according to Claim 1, characterized in that it consists of a single piece. Ensemble spiral-courbe pour mouvement d'horlogerie mécanique selon la revendication 1 caractérisé par le fait qu'il est constitué de plusieurs pièces assemblées de façon rigide ou non.Spiral-curve assembly for mechanical clockwork according to claim 1 characterized in that it consists of several pieces assembled rigidly or not.
EP05405216A 2004-04-13 2005-03-01 Spiral spring for mechanical clockwork Withdrawn EP1605323A3 (en)

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Cited By (11)

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EP2017681A1 (en) * 2007-07-19 2009-01-21 Noriah SA Breguet overcoil for timepiece and method of manufacturing the same
JP2009533917A (en) * 2006-04-07 2009-09-17 ザ スウォッチ グループ リサーチ アンド ディベロップメント リミティド． Coupled resonators for tuning systems
EP2105807A1 (en) 2008-03-28 2009-09-30 Nivarox-FAR S.A. Monobloc elevated curve spiral and method for manufacturing same
EP2138912A1 (en) 2008-06-24 2009-12-30 Belot, Michel Horological hairspring with concentric development
EP2184652A1 (en) * 2008-11-06 2010-05-12 Montres Breguet SA Spiral with terminal curve elevation in micro-machinable material
EP2196868A1 (en) * 2008-12-15 2010-06-16 Montres Breguet SA Hairspring with curve elevation made from a silicon-based material
US8322914B2 (en) 2010-05-18 2012-12-04 Montres Breguet Sa Silicon overcoil balance spring
CH706087A1 (en) * 2012-02-01 2013-08-15 Piguet & Co Horlogerie Flat spiral for integration in control element of movement in timepiece, has series of turns formed by rolled plate, where outer end portion of spiral includes series of stiffened zones separated by flexible zones
CH708429A1 (en) * 2013-08-19 2015-02-27 Manuf Et Fabrique De Montres Et Chronomètres Ulysse Nardin Le Locle S A Spiral for a regulating member of a mechanical watch, a regulating member provided with such a hairspring, and method of making such a hairspring.
CN110275420A (en) * 2018-03-16 2019-09-24 斯沃奇集团研究和开发有限公司 Clock and watch including the mechanical movement by electronic device regulations speed
CN110967959A (en) * 2018-09-28 2020-04-07 斯沃奇集团研究和开发有限公司 Timepiece including a mechanical movement whose operation is controlled by electronic means

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US8215828B2 (en) 2008-11-06 2012-07-10 Montres Breguet S.A. Breguet overcoil balance spring made of micro-machinable material
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EP2869138A2 (en) 2013-08-19 2015-05-06 Manufacture et fabrique de montres et chronomètres Ulysse Nardin Le Locle SA Hairspring for a regulating member of a mechanical watch, regulating member provided with such a hairspring, and method for manufacturing such a hairspring
EP2869138A3 (en) * 2013-08-19 2016-03-09 Manufacture et fabrique de montres et chronomètres Ulysse Nardin Le Locle SA Hairspring for a regulating member of a mechanical watch, regulating member provided with such a hairspring, and method for manufacturing such a hairspring
CN110275420A (en) * 2018-03-16 2019-09-24 斯沃奇集团研究和开发有限公司 Clock and watch including the mechanical movement by electronic device regulations speed
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US11415946B2 (en) 2018-03-16 2022-08-16 The Swatch Group Research And Development Ltd Timepiece comprising a mechanical movement whose rate is regulated by an electronic device
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