EP3736640A1 - Clock balance - Google Patents

Clock balance Download PDF

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Publication number
EP3736640A1
EP3736640A1 EP19173069.6A EP19173069A EP3736640A1 EP 3736640 A1 EP3736640 A1 EP 3736640A1 EP 19173069 A EP19173069 A EP 19173069A EP 3736640 A1 EP3736640 A1 EP 3736640A1
Authority
EP
European Patent Office
Prior art keywords
balance
weight
elastic arm
elastic
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19173069.6A
Other languages
German (de)
French (fr)
Other versions
EP3736640B1 (en
Inventor
Ivan Hernandez
Pierre Cusin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nivarox Far SA
Nivarox SA
Original Assignee
Nivarox Far SA
Nivarox SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nivarox Far SA, Nivarox SA filed Critical Nivarox Far SA
Priority to EP19173069.6A priority Critical patent/EP3736640B1/en
Priority to US16/829,053 priority patent/US11531304B2/en
Priority to JP2020068141A priority patent/JP6960498B2/en
Priority to RU2020115006A priority patent/RU2745732C1/en
Priority to CN202010377677.2A priority patent/CN111913381B/en
Publication of EP3736640A1 publication Critical patent/EP3736640A1/en
Application granted granted Critical
Publication of EP3736640B1 publication Critical patent/EP3736640B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction
    • 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
    • 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
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/006—Mechanisms for setting frequency by adjusting the devices fixed on the balance
    • 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
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/04—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat
    • 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
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/08—Component parts or constructional details

Definitions

  • the invention relates to a balance for a clockwork movement, comprising rigid parts consisting of a hub defining the pivot axis of the balance, a rim, and at least one arm connecting the rim to the hub, and comprising at least one locking member. holding for reception and pinching in position of a rod of a weight.
  • the invention relates to the field of clock oscillators, and more particularly to the field of balances comprising means for adjusting inertia and / or balancing.
  • balances Numerous embodiments of balances are known with means for adjusting inertia and / or balancing.
  • Some embodiments have attempted to ensure the retention of the weights by pinching.
  • CH 705 238 which discloses a balance comprising at least one slot for receiving and pinching in position a rod of a weight, the slot being delimited by, on the one hand a said rigid part of the balance, and on the other hand an arm elastic permanently biased towards said rigid part of said balance defining said slot to hold the weight.
  • the elastic arm undergoes significant plastic deformations due to its separation. These plastic deformations can then cause defects in the material, such as cracks. This can therefore adversely affect the reliability of the balance, or even damage it, the weight no longer being able to be held correctly by the elastic arm and become dislodged.
  • the object of the invention is in particular to overcome the various drawbacks of these known techniques.
  • an objective of the invention is to provide a balance making it possible to obtain better maintenance of the weights with an elastic arm capable of remaining within stress levels not exceeding its elastic limit and thus minimizing the risk of defects.
  • Another objective of the invention is to provide a balance with an elastic arm having a sufficiently rigid geometry and allowing sufficient support force to allow the weight to be held in place regardless of the type of shock that the watch has. suffered.
  • the invention also relates to a timepiece movement comprising a sprung balance oscillator system in accordance with the invention.
  • the invention also relates to a timepiece comprising a watch movement according to the invention.
  • the invention also relates to a method of mounting a weight on a balance according to the invention.
  • the object of the present invention by its various functional and structural aspects described above, makes it possible to obtain a more robust balance, in particular by virtue of a better distribution of the stresses.
  • the elastic arm allows a good hold of the weight thanks to its particular geometry which makes it possible to increase the volume of material under stress and to store more elastic energy.
  • the invention relates to a balance 1 for a timepiece movement.
  • the balance comprising rigid parts consisting of a hub 2 whose center defines the pivot axis A of the balance 1, a rim 3, and at least one arm 4 connecting the rim 3 to the hub 2.
  • the balance is made of copper, or of a copper alloy such as nickel silver.
  • the balance wheel can also be made of aluminum, an aluminum alloy, titanium or titanium alloy, gold or gold alloy, platinum or platinum alloy.
  • the balance 1 also comprises at least one elastic arm 5 comprising a first end 5B integral with a rigid part of said balance 1, and a second distal end 5A free with respect to said hub 2, said arm 4, and said rim sector 3, the free end 5A being able to deform in the plane of the rim and tighten a weight 6 on the balance.
  • the balance also has a slot 7 adapted to receive the weight 6, the slot 7 being delimited on the one hand by the free end 5A of the elastic arm, and on the other hand by a rigid wall 8 integral with the rim and the hub. .
  • the slot 7 has an opening 9 allowing the end 5A of the elastic arm to move perpendicularly with respect to the rigid wall 8 and to be in contact with the weight 6 to clamp it against said rigid wall when the latter is placed in slot.
  • the slot 7 opens into a housing 10 and comprises a notch 11 for precisely positioning the weight 6 and keep it in place.
  • the width of the opening 9 is provided less than the diameter of the weight or of the shank of the weight to hold the weight in place.
  • the weight 6 comprises a head 61 comprising an adjustment profile 63 arranged to cooperate with a tool.
  • the weight 6 may include a rod 62 which extends this head 61, which has a diameter greater than that of the rod 7.
  • the weight 6 is equipped with a foot 65, which the rod 62 then connects to the head 61, the latter and the foot 65 then both having a diameter greater than that of the rod. 62, so as to limit the travel of the weight 6 at the level of the elastic arm 5, in a direction parallel to the pivot axis D, or even to immobilize it in this direction.
  • the rod 62 extends along an axis passing through the center of the weight 6, once clamped in the clamping member 5, the weight is adjustable angularly about this axis by means of a tool on the adjustment profile 63
  • the weight 6 comprises an unbalance around this axis, which results for example from a flat 64 made on the head 61, as visible on the figure 2a .
  • the elastic arm 5 forms a housing 10 delimited by a wall 5B, the body 5C of the elastic arm is arranged to deform elastically during the assembly of the weight 6 to the balance, the free end 5A of the arm.
  • elastic 5 being able to move substantially perpendicularly, in the plane of the rim, with respect to the rigid wall 8.
  • the body 5C of the elastic arm can be considered as an embedded beam of non-constant section stressed in bending , the body 5C therefore undergoes very little plastic deformation and the lower part of the wall 5B hardly undergoes any.
  • the elastic arm 5 undergoes only 0.3% of plastic deformations while the solution used in the prior art undergoes 2% of plastic deformations.
  • the solution used therefore makes it possible to reduce the stresses undergone by the elastic arm 5 during the installation of the weight 6.
  • the dimensions and the geometry of the elastic arm 5 are determined to obtain a minimum desired holding force of the weight, the holding force obtained by the elastic arm being at least 0.7N.
  • the section of the body of the elastic arm varies, its section changing so as to increase the material under stress and to store therein as much elastic energy as possible.
  • the body 5C has a non-constant section, a part of the body having a greater thickness locally compared to the rest of the body.
  • Such a configuration makes it possible to have more material under stress and therefore to store more energy and thus restore a good holding force on the weight 6.
  • the thickness of the body 5C can be expected to increase. from its free end to its connection at the hub.
  • the length and the width of the deformable portion 5C are determined to remain below a stress level in order to avoid plastic deformation.
  • the dimensions of the elastic arm 5 make it possible to store a significant elastic energy resulting from the deformation of the arm, the deformation energy being restored in the form of a holding force on the rod of the weight clamped by the elastic arm 5, which ensures its strength and torque resistance in the notch 11.
  • the housing 10 formed by the elastic arm 5 has a relatively large radius at the bottom of curvature, this particular shape is determined to obtain a better distribution of the stresses during the assembly of the weight 6, the stresses being distributed over a much larger surface area compared to the prior art that prevents weakening of the structure at the bottom of the curvature.
  • the radius at the bottom of the curvature of the retaining member is much smaller, which implies a very localized distribution of stresses, the formation of microcracks at this location, and therefore a gradual reduction in the holding force over time.
  • the housing 10 has a substantially ovoid shape with an entrance defined by the slot 7 and a bottom, the bottom of the housing having dimensions greater than the entrance of the housing.
  • the body 5C of the at least one elastic arm 5 is integral with the hub 2.
  • This first embodiment is advantageous because the weight 6 can be placed beforehand in the housing 10 before moving it laterally in the slot 7 towards the notch 11, and there is therefore no longer any need to separate the arm mechanically in order to place the weight 6 therein, which reduces the stresses exerted on the elastic arm 5 by a minimum spacing just sufficient to slide the rod there.
  • the method may comprise an optional step following step c) during which the weight 6 is finely positioned so that the head of the weight is in contact with the upper face of the arm 5 and the upper face of the rigid wall 8.
  • the invention also relates to a balance 1 which comprises a plurality of retaining members 5, each being arranged to receive at least one weight 6.
  • the invention also relates to a timepiece movement comprising at least one such balance 1 as described above.
  • the invention also relates to a timepiece comprising at least one such movement, and which is preferably a watch.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
  • Micromachines (AREA)
  • Springs (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention se rapporte à un balancier pour mouvement d'horlogerie, comprenant des parties rigides constituées par un moyeu définissant l'axe de pivotement du balancier, au moins un secteur de serge, au moins un bras reliant ledit au moins un secteur de serge audit moyeu, et comportant une fente pour la réception et le pincement en position d'une masselotte, la fente débouchant dans un logement délimité d'une part par une partie rigide dudit balancier, et d'autre part un bras élastique comportant une première extrémité solidaire d'une partie rigide dudit balancier, et une deuxième extrémité distale libre. Selon l'invention, le bras élastique présente un corps de section non constante, une partie du corps ayant une épaisseur plus importante que le reste du bras élastique de sorte à avoir un volume de matière sous contrainte plus important et emmagasiner un maximum d'énergie élastique.The invention relates to a balance for a clockwork movement, comprising rigid parts constituted by a hub defining the pivot axis of the balance, at least one rim sector, at least one arm connecting said at least one rim sector said hub, and comprising a slot for receiving and pinching in position a weight, the slot opening into a housing delimited on the one hand by a rigid part of said balance, and on the other hand an elastic arm comprising a first end integral with a rigid part of said balance, and a second free distal end. According to the invention, the elastic arm has a body of non-constant section, a part of the body having a greater thickness than the rest of the elastic arm so as to have a larger volume of material under stress and to store a maximum of energy. elastic.

Description

Domaine de l'inventionField of the invention

L'invention concerne un balancier pour mouvement d'horlogerie, comportant des parties rigides constituées par un moyeu définissant l'axe de pivotement du balancier, une serge, et au moins un bras reliant la serge au moyeu, et comportant au moins un organe de maintien pour la réception et le pincement en position d'une tige d'une masselotte.The invention relates to a balance for a clockwork movement, comprising rigid parts consisting of a hub defining the pivot axis of the balance, a rim, and at least one arm connecting the rim to the hub, and comprising at least one locking member. holding for reception and pinching in position of a rod of a weight.

L'invention concerne le domaine des oscillateurs d'horlogerie, et plus particulièrement le domaine des balanciers comportant des moyens de réglage d'inertie ou/et d'équilibrage.The invention relates to the field of clock oscillators, and more particularly to the field of balances comprising means for adjusting inertia and / or balancing.

Arrière-plan de l'inventionBackground of the invention

On connaît de nombreuses réalisations de balanciers avec des moyens de réglage d'inertie ou/et d'équilibrage. Notamment on connaît des balanciers à masselottes vissées ou chassées dans des implantations de la serge d'un balancier. Certaines réalisations ont tenté d'assurer le maintien de masselottes par pincement. On connaît ainsi le document CH 705 238 qui divulgue un balancier comportant au moins une fente pour la réception et le pincement en position d'une tige d'une masselotte, la fente étant délimitée par, d'une part une dite partie rigide du balancier, et d'autre part un bras élastique en permanence rappelé vers ladite partie rigide dudit balancier délimitant ladite fente pour maintenir la masselotte.Numerous embodiments of balances are known with means for adjusting inertia and / or balancing. In particular, we know balances with screw weights or driven into implantations of the rim of a balance. Some embodiments have attempted to ensure the retention of the weights by pinching. We thus know the document CH 705 238 which discloses a balance comprising at least one slot for receiving and pinching in position a rod of a weight, the slot being delimited by, on the one hand a said rigid part of the balance, and on the other hand an arm elastic permanently biased towards said rigid part of said balance defining said slot to hold the weight.

Lors de l'insertion des masselottes le bras élastique subit des déformations plastiques importantes dû à son écartement. Ces déformations plastiques peuvent alors causer des défauts dans la matière, comme des fissures. Cela peut donc nuire à la fiabilité du balancier, voire le détériorer, la masselotte pouvant ne plus être maintenue correctement par le bras élastique et se déloger.During the insertion of the weights the elastic arm undergoes significant plastic deformations due to its separation. These plastic deformations can then cause defects in the material, such as cracks. This can therefore adversely affect the reliability of the balance, or even damage it, the weight no longer being able to be held correctly by the elastic arm and become dislodged.

Résumé de l'inventionSummary of the invention

L'invention a notamment pour objectif de pallier les différents inconvénients de ces techniques connues.The object of the invention is in particular to overcome the various drawbacks of these known techniques.

Plus précisément, un objectif de l'invention est de fournir un balancier permettant d'obtenir un meilleur maintien des masselottes avec un bras élastique capable de rester dans des niveaux de contraintes ne dépassant pas sa limite élastique et ainsi minimiser le risque de défauts.More precisely, an objective of the invention is to provide a balance making it possible to obtain better maintenance of the weights with an elastic arm capable of remaining within stress levels not exceeding its elastic limit and thus minimizing the risk of defects.

Un autre objectif de l'invention est de fournir un balancier avec un bras élastique ayant une géométrie suffisamment rigide et permettant une force d'appui suffisante pour permettre à la masselotte d'être maintenue en place quel que soit le type de choc que la montre subit.Another objective of the invention is to provide a balance with an elastic arm having a sufficiently rigid geometry and allowing sufficient support force to allow the weight to be held in place regardless of the type of shock that the watch has. suffered.

Ces objectifs, ainsi que d'autres qui apparaîtront plus clairement par la suite, sont atteints selon l'invention à l'aide d'un balancier pour mouvement d'horlogerie selon la revendication 1.These objectives, as well as others which will emerge more clearly below, are achieved according to the invention with the aid of a balance for a clockwork movement according to claim 1.

Conformément à d'autres variantes avantageuses de l'invention :

  • le bras élastique est conformé pour rester sous un seuil de déformation plastique de 0.3% en fond de logement lors d'une élévation sensiblement verticale du bras élastique par rapport à la partie rigide du balancier pour mettre en place la tige de la masselotte ;
  • le logement est de forme sensiblement ovoïde avec une entrée définie par la fente et un fond, le fond du logement présentant des dimensions supérieures à l'entrée du logement ;
  • le bras élastique fourni une force de retenue d'au moins 0.7N lorsque la masselotte est montée ;
  • la partie rigide comprend une encoche pour positionner la masselotte, la largeur de l'ouverture étant inférieure au diamètre de la tige de la masselotte ;
  • le bras élastique est solidaire de la serge ;
  • le bras élastique est solidaire du moyeu ;
  • l'au moins un bras élastique est monobloc avec le balancier ;
  • le balancier comprend plusieurs bras élastiques, les bras élastiques étant disposés selon une symétrie centrale ayant pour centre celui du balancier.
In accordance with other advantageous variants of the invention:
  • the elastic arm is shaped to remain under a plastic deformation threshold of 0.3% at the bottom of the housing during a substantially vertical rise of the elastic arm with respect to the rigid part of the balance in order to position the rod of the weight;
  • the housing is of substantially ovoid shape with an entrance defined by the slot and a bottom, the bottom of the housing having dimensions greater than the entrance of the housing;
  • the elastic arm provides a retaining force of at least 0.7N when the weight is mounted;
  • the rigid part comprises a notch for positioning the weight, the width of the opening being less than the diameter of the shank of the weight;
  • the elastic arm is integral with the rim;
  • the elastic arm is integral with the hub;
  • at least one elastic arm is integral with the balance;
  • the balance comprises several elastic arms, the elastic arms being arranged in a central symmetry having for center that of the balance.

L'invention concerne aussi un mouvement d'horlogerie comprenant un système oscillateur balancier-spiral conforme à l'invention.The invention also relates to a timepiece movement comprising a sprung balance oscillator system in accordance with the invention.

L'invention concerne également une pièce d'horlogerie comprenant un mouvement horloger conforme à l'invention.The invention also relates to a timepiece comprising a watch movement according to the invention.

L'invention concerne également un procédé de montage d'une masselotte sur un balancier conforme à l'invention.The invention also relates to a method of mounting a weight on a balance according to the invention.

Ainsi, l'objet de la présente invention, par ses différents aspects fonctionnels et structurels décrits ci-dessus, permet d'obtenir un balancier plus robuste notamment grâce à une meilleure répartition des contraintes. De plus, le bras élastique permet une bonne tenue de la masselotte grâce à sa géométrie particulière qui permet d'augmenter le volume de matière sous contrainte et stocker plus d'énergie élastique.Thus, the object of the present invention, by its various functional and structural aspects described above, makes it possible to obtain a more robust balance, in particular by virtue of a better distribution of the stresses. In addition, the elastic arm allows a good hold of the weight thanks to its particular geometry which makes it possible to increase the volume of material under stress and to store more elastic energy.

Description sommaire des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante d'un mode de réalisation particulier de l'invention, donné à titre de simple exemple illustratif et non limitatif, et des figures annexées, parmi lesquelles :

  • les figures 1, 2a et 2b sont respectivement des vues de dessus et une vue de dessous d'un balancier conforme à l'invention selon un premier mode de réalisation ;
  • la figure 3 est une vue détaillée d'un organe de serrage élastique d'un balancier conforme à l'invention selon un premier mode de réalisation ;
  • les figures 4a et 4b sont respectivement des vues de dessus d'un balancier conforme à l'invention selon un deuxième et un troisième mode de réalisation.
Other characteristics and advantages of the invention will emerge more clearly on reading the following description of a particular embodiment of the invention, given by way of simple illustrative and non-limiting example, and the appended figures, among which :
  • the figures 1, 2a and 2b are respectively top views and a bottom view of a balance according to the invention according to a first embodiment;
  • the figure 3 is a detailed view of an elastic clamping member of a balance according to the invention according to a first embodiment;
  • FIGS. 4a and 4b are respectively top views of a balance according to the invention according to a second and a third embodiment.

Description détaillée des modes de réalisation préférésDetailed description of the preferred embodiments

Un balancier selon un exemple de réalisation va maintenant être décrit dans ce qui suit faisant référence conjointement aux figures 1a, 2a, 2b, 3, 4a et 4b.A balance according to an exemplary embodiment will now be described in the following with reference jointly to the figures 1a, 2a, 2b , 3 , 4a and 4b.

L'invention concerne un balancier 1 pour mouvement d'horlogerie. Le balancier comprenant des parties rigides constituées par un moyeu 2 dont le centre définit l'axe de pivotement A du balancier 1, une serge 3, et au moins un bras 4 reliant la serge 3 au moyeu 2.The invention relates to a balance 1 for a timepiece movement. The balance comprising rigid parts consisting of a hub 2 whose center defines the pivot axis A of the balance 1, a rim 3, and at least one arm 4 connecting the rim 3 to the hub 2.

Selon les besoins de l'homme du métier, le balancier est fabriqué en cuivre, ou en un alliage cuivreux tel que le maillechort. Le balancier peut également être fabriqué en aluminium, en un alliage d'aluminium, en titane ou alliage de titane, en or ou alliage d'or, en platine ou alliage de platine.According to the needs of those skilled in the art, the balance is made of copper, or of a copper alloy such as nickel silver. The balance wheel can also be made of aluminum, an aluminum alloy, titanium or titanium alloy, gold or gold alloy, platinum or platinum alloy.

Le balancier 1 comprend également au moins un bras élastique 5 comprenant une première extrémité 5B solidaire d'une partie rigide dudit balancier 1, et une deuxième extrémité distale 5A libre par rapport audit moyeu 2, audit bras 4, et audit secteur de serge 3, l'extrémité libre 5A étant apte à se déformer dans le plan de la serge et serrer une masselotte 6 sur le balancier. Le balancier présente également une fente 7 apte à recevoir la masselotte 6, la fente 7 étant délimité d'une part par l'extrémité libre 5A du bras élastique, et d'autre part par une paroi rigide 8 solidaire de la serge et du moyeu. La fente 7 présente une ouverture 9 permettant à l'extrémité 5A du bras élastique de se déplacer perpendiculairement par rapport à la paroi rigide 8 et d'être en contact avec la masselotte 6 pour la serrer contre ladite paroi rigide lorsque cette dernière est placée dans la fente.The balance 1 also comprises at least one elastic arm 5 comprising a first end 5B integral with a rigid part of said balance 1, and a second distal end 5A free with respect to said hub 2, said arm 4, and said rim sector 3, the free end 5A being able to deform in the plane of the rim and tighten a weight 6 on the balance. The balance also has a slot 7 adapted to receive the weight 6, the slot 7 being delimited on the one hand by the free end 5A of the elastic arm, and on the other hand by a rigid wall 8 integral with the rim and the hub. . The slot 7 has an opening 9 allowing the end 5A of the elastic arm to move perpendicularly with respect to the rigid wall 8 and to be in contact with the weight 6 to clamp it against said rigid wall when the latter is placed in slot.

Avantageusement, la fente 7 débouche dans un logement 10 et comprend une encoche 11 pour positionner précisément la masselotte 6 et la maintenir en place. La largeur de l'ouverture 9 est prévue inférieure au diamètre de la masselotte ou de la tige de la masselotte pour maintenir en place la masselotte.Advantageously, the slot 7 opens into a housing 10 and comprises a notch 11 for precisely positioning the weight 6 and keep it in place. The width of the opening 9 is provided less than the diameter of the weight or of the shank of the weight to hold the weight in place.

La masselotte 6 comporte une tête 61 comportant un profil de réglage 63 agencé pour coopérer avec un outil. La masselotte 6 peut comprendre une tige 62 qui prolonge cette tête 61, laquelle est de diamètre supérieur à celui de la tige 7.The weight 6 comprises a head 61 comprising an adjustment profile 63 arranged to cooperate with a tool. The weight 6 may include a rod 62 which extends this head 61, which has a diameter greater than that of the rod 7.

Dans l'exemple illustré sur les figures, la masselotte 6 est équipée d'un pied 65, que la tige 62 relie alors à la tête 61, celle-ci et le pied 65 ayant alors tous deux un diamètre supérieur à celui de la tige 62, de façon à limiter la course de la masselotte 6 au niveau du bras élastique 5, dans une direction parallèle à l'axe de pivotement D, voire à l'immobiliser dans cette direction.In the example illustrated in the figures, the weight 6 is equipped with a foot 65, which the rod 62 then connects to the head 61, the latter and the foot 65 then both having a diameter greater than that of the rod. 62, so as to limit the travel of the weight 6 at the level of the elastic arm 5, in a direction parallel to the pivot axis D, or even to immobilize it in this direction.

La tige 62 s'étend selon un axe passant par le centre de la masselotte 6, une fois pincée dans l'organe de serrage 5, la masselotte est orientable angulairement autour de cet axe au moyen d'un outil sur le profil de réglage 63. La masselotte 6 comporte un balourd autour de cet axe, qui résulte par exemple d'un plat 64 pratiqué sur la tête 61, tel que visible sur la figure 2a.The rod 62 extends along an axis passing through the center of the weight 6, once clamped in the clamping member 5, the weight is adjustable angularly about this axis by means of a tool on the adjustment profile 63 The weight 6 comprises an unbalance around this axis, which results for example from a flat 64 made on the head 61, as visible on the figure 2a .

Lorsque la masselotte 6 est placée dans l'encoche 11 de l'ouverture 9, l'extrémité libre 5A du bras élastique 5 se déplace sensiblement perpendiculaire à la direction générale du rayon reliant l'attache du bras rigide au moyeu et à la serge par rapport à la paroi rigide 8.When the weight 6 is placed in the notch 11 of the opening 9, the free end 5A of the elastic arm 5 moves substantially perpendicular to the general direction of the radius connecting the attachment of the rigid arm to the hub and to the rim by relative to the rigid wall 8.

Selon l'invention, le bras élastique 5 forme un logement 10 délimité par une paroi 5B, le corps 5C du bras élastique est agencé pour se déformer élastiquement lors de l'assemblage de la masselotte 6 au balancier, l'extrémité libre 5A du bras élastique 5 étant apte à se déplacer sensiblement perpendiculairement, dans le plan de la serge, par rapport à la paroi rigide 8. Dans le cas présente, le corps 5C du bras élastique peut être considéré comme un poutre encastrée de section non constante sollicitée en flexion, le corps 5C ne subit donc que très peu de déformations plastiques et la partie inférieure de la paroi 5B n'en subit quasiment aucune.According to the invention, the elastic arm 5 forms a housing 10 delimited by a wall 5B, the body 5C of the elastic arm is arranged to deform elastically during the assembly of the weight 6 to the balance, the free end 5A of the arm. elastic 5 being able to move substantially perpendicularly, in the plane of the rim, with respect to the rigid wall 8. In the present case, the body 5C of the elastic arm can be considered as an embedded beam of non-constant section stressed in bending , the body 5C therefore undergoes very little plastic deformation and the lower part of the wall 5B hardly undergoes any.

D'après les tests réalisés par les inventeurs, le bras élastique 5 ne subit que 0.3% de déformations plastiques alors que la solution utilisée dans l'art antérieur subit 2% de déformations plastiques. La solution utilisée permet donc bien de réduire les contraintes subites par le bras élastique 5 lors de la mise en place de la masselotte 6.According to the tests carried out by the inventors, the elastic arm 5 undergoes only 0.3% of plastic deformations while the solution used in the prior art undergoes 2% of plastic deformations. The solution used therefore makes it possible to reduce the stresses undergone by the elastic arm 5 during the installation of the weight 6.

Les dimensions et la géométrie du bras élastique 5 sont déterminées pour obtenir une force de tenue souhaitée minimale de la masselotte, la force de tenue obtenue par le bras élastique étant d'au moins 0.7N.The dimensions and the geometry of the elastic arm 5 are determined to obtain a minimum desired holding force of the weight, the holding force obtained by the elastic arm being at least 0.7N.

Avantageusement, la section du corps du bras élastique varie, sa section évoluant de manière à augmenter la matière sous contrainte et d'y stocker le maximum d'énergie élastique possible. Tel que représenté à la figure 3, le corps 5C présente une section non constante, une partie du corps ayant une épaisseur plus importante localement par rapport au reste du corps. Une telle configuration permet d'avoir plus de matière sous contrainte et donc d'emmagasiner plus d'énergie et ainsi restituer une bonne force de tenue sur la masselotte 6. A titre d'exemple, l'épaisseur du corps 5C peut être prévue croissante de son extrémité libre jusqu'à sa liaison au niveau du moyeu.Advantageously, the section of the body of the elastic arm varies, its section changing so as to increase the material under stress and to store therein as much elastic energy as possible. As depicted in figure 3 , the body 5C has a non-constant section, a part of the body having a greater thickness locally compared to the rest of the body. Such a configuration makes it possible to have more material under stress and therefore to store more energy and thus restore a good holding force on the weight 6. By way of example, the thickness of the body 5C can be expected to increase. from its free end to its connection at the hub.

De même, la longueur et la largeur de la portion déformable 5C sont déterminées pour rester en dessous d'un niveau de contrainte afin éviter une déformation plastique. Les dimensions du bras élastique 5 permettent d'emmagasiner une énergie élastique importante résultant de la déformation du bras, l'énergie de déformation étant restituée sous la forme d'une force de maintien sur la tige de la masselotte serrée par le bras élastique 5, ce qui assure sa tenue en force et en couple dans l'encoche 11.Likewise, the length and the width of the deformable portion 5C are determined to remain below a stress level in order to avoid plastic deformation. The dimensions of the elastic arm 5 make it possible to store a significant elastic energy resulting from the deformation of the arm, the deformation energy being restored in the form of a holding force on the rod of the weight clamped by the elastic arm 5, which ensures its strength and torque resistance in the notch 11.

On remarquera également que le logement 10 formé par le bras élastique 5 présente un rayon en fond de courbure relativement grand, cette forme particulière est déterminée pour obtenir une meilleure répartition des contraintes lors de l'assemblage de la masselotte 6, les contraintes étant réparties sur une surface bien plus grande par rapport à l'art antérieur cela permet d'éviter la fragilisation de la structure en fond de courbure. En effet, dans l'art antérieur le rayon en fond de courbure de l'organe de maintien est bien plus petit, ce qui implique une répartition des contraintes très localisée, la formation de microfissures à cet endroit, et donc une diminution progressive de la force de maintien au fil du temps.It will also be noted that the housing 10 formed by the elastic arm 5 has a relatively large radius at the bottom of curvature, this particular shape is determined to obtain a better distribution of the stresses during the assembly of the weight 6, the stresses being distributed over a much larger surface area compared to the prior art that prevents weakening of the structure at the bottom of the curvature. In fact, in the prior art, the radius at the bottom of the curvature of the retaining member is much smaller, which implies a very localized distribution of stresses, the formation of microcracks at this location, and therefore a gradual reduction in the holding force over time.

Tel que représenté sur les figures, le logement 10 présente une forme sensiblement ovoïde avec une entrée définie par la fente 7 et un fond, le fond du logement présentant des dimensions supérieures à l'entrée du logement.As shown in the figures, the housing 10 has a substantially ovoid shape with an entrance defined by the slot 7 and a bottom, the bottom of the housing having dimensions greater than the entrance of the housing.

L'invention permet, par la géométrie particulière du bras élastique 5, d'obtenir une force de tenue satisfaisante de la masselotte et d'éliminer la formation de zones fragilisées lorsque le bras est déplacé pour placer la masselotte 6. Il apparait que la quantité de matière sous contrainte est déterminante pour exercer une force de maintien satisfaisante sur la masselotte (Selon la formule de Clapeyron, l'énergie élastique stockée dans le corps matériel est égale au travail de tous les efforts appliqués, W = 1 2 ∑ i n Fι → Δ dι →

Figure imgb0001
).The invention makes it possible, by the particular geometry of the elastic arm 5, to obtain a satisfactory holding force for the weight and to eliminate the formation of weakened zones when the arm is moved to place the weight 6. It appears that the quantity of material under stress is decisive for exerting a satisfactory holding force on the weight (According to Clapeyron's formula, the elastic energy stored in the material body is equal to the work of all the forces applied, W = 1 2 ∑ i not Feb → Δ dι →
Figure imgb0001
 ).

La solution idéale serait donc d'augmenter le plus possible la quantité de matière sous contrainte pour que le bras élastique restitue une plus grande force de maintien. Cependant, une telle option implique un encombrement plus important des bras élastiques, ce qui modifierait sensiblement l'inertie du balancier et compliquerait le montage de ce dernier, notamment le pitonnage.The ideal solution would therefore be to increase the quantity of material under stress as much as possible so that the elastic arm restores a greater holding force. However, such an option implies a larger size of the elastic arms, which would significantly modify the inertia of the balance and complicate the assembly of the latter, in particular the bolt.

Dans un premier mode préféré de réalisation, tel que visible sur les figures 1, 2a, 2b et 3 le corps 5C de l'au moins un bras élastique 5 est solidaire du moyeu 2. Ce premier mode de réalisation est avantageux car la masselotte 6 peut être placée préalablement dans le logement 10 avant de la déplacer latéralement dans la fente 7 vers l'encoche 11, et il n'y a donc plus besoin d'écarter le bras mécaniquement pour y placer la masselotte 6, ce qui réduit les contraintes exercées sur le bras élastique 5 par un écartement minimum juste suffisant pour y glisser la tige.In a first preferred embodiment, as seen on the figures 1, 2a, 2b and 3 the body 5C of the at least one elastic arm 5 is integral with the hub 2. This first embodiment is advantageous because the weight 6 can be placed beforehand in the housing 10 before moving it laterally in the slot 7 towards the notch 11, and there is therefore no longer any need to separate the arm mechanically in order to place the weight 6 therein, which reduces the stresses exerted on the elastic arm 5 by a minimum spacing just sufficient to slide the rod there.

L'invention concerne également un procédé de montage d'une masselotte sur un balancier tel que décrit précédemment. Le procédé de montage selon l'invention comprend les étapes suivantes :

  1. a) placer le balancier 1 sur un support et le maintenir en place ;
  2. b) placer la masselotte 6 au niveau du logement 10 de sorte que le pied 65 repose dans le logement, le pied 65 étant positionné dans l'alignement de la fente 7 ;
  3. c) déplacer la masselotte 6 selon une direction rectiligne vers la fente 7 pour loger le pied 65 dans l'encoche 11.
The invention also relates to a method for mounting a weight on a balance as described above. The assembly method according to the invention comprises the following steps:
  1. a) place the balance 1 on a support and keep it in place;
  2. b) placing the weight 6 at the level of the housing 10 so that the foot 65 rests in the housing, the foot 65 being positioned in line with the slot 7;
  3. c) moving the weight 6 in a rectilinear direction towards the slot 7 to accommodate the foot 65 in the notch 11.

Le procédé peut comprendre une étape optionnelle à la suite de l'étape c) au cours de laquelle la masselotte 6 est positionnée finement de manière que la tête de la masselotte soit en contact avec la face supérieure du bras 5 et la face supérieure de la paroi rigide 8.The method may comprise an optional step following step c) during which the weight 6 is finely positioned so that the head of the weight is in contact with the upper face of the arm 5 and the upper face of the rigid wall 8.

L'invention concerne encore un balancier 1 qui comporte une pluralité d'organes de maintien 5, chacun étant agencé pour recevoir au moins une masselotte 6.The invention also relates to a balance 1 which comprises a plurality of retaining members 5, each being arranged to receive at least one weight 6.

L'invention concerne encore un mouvement d'horlogerie comportant au moins un tel balancier 1 tel que décrit précédemment.The invention also relates to a timepiece movement comprising at least one such balance 1 as described above.

L'invention concerne encore une pièce d'horlogerie comportant au moins un tel mouvement, et qui est de préférence une montre.The invention also relates to a timepiece comprising at least one such movement, and which is preferably a watch.

Claims (11)

Balancier (1) pour mouvement d'horlogerie, comprenant des parties rigides constituées par un moyeu (2) définissant l'axe de pivotement (D) dudit balancier (1), au moins un secteur de serge (3), au moins un bras (4) reliant ledit au moins un secteur de serge (3) audit moyeu (2), et comportant au moins une fente (7) pour la réception et le pincement en position d'une masselotte (6), ladite au moins une fente (7) débouchant dans un logement (10) délimité d'une part par une partie rigide (8) dudit balancier (1), et d'autre part un bras élastique (5) comportant une première extrémité (5B) solidaire d'une partie rigide dudit balancier (1), et une deuxième extrémité distale (5A) libre par rapport audit moyeu (2), audit bras (4), et audit secteur de serge (3),
caractérisé en ce que ledit bras élastique (5) présente un corps (5C) de section non constante, une partie du corps ayant une épaisseur plus importante que le reste du bras élastique (5) de sorte à avoir un volume de matière sous contrainte plus important et emmagasiner un maximum d'énergie élastique.Balance (1) for a timepiece movement, comprising rigid parts constituted by a hub (2) defining the pivot axis (D) of said balance (1), at least one serge sector (3), at least one arm (4) connecting said at least one serge sector (3) to said hub (2), and comprising at least one slot (7) for receiving and gripping in position of a weight (6), said at least one slot (7) opening into a housing (10) delimited on the one hand by a rigid part (8) of said rocker (1), and on the other hand an elastic arm (5) comprising a first end (5B) integral with a rigid part of said balance (1), and a second distal end (5A) free relative to said hub (2), to said arm (4), and to said rim sector (3),
characterized in that said elastic arm (5) has a body (5C) of non-constant section, a part of the body having a greater thickness than the rest of the elastic arm (5) so as to have a volume of material under stress more important and store a maximum of elastic energy. Balancier (1) selon la revendication 1, caractérisé en ce que le bras élastique (5) est conformé pour rester sous un seuil de déformation plastique de 0.3% en fond de logement lors d'une élévation sensiblement verticale du bras élastique (5) par rapport à la partie rigide (8) du balancier pour mettre en place la tige de la masselotte.Balance (1) according to Claim 1, characterized in that the elastic arm (5) is shaped to remain under a plastic deformation threshold of 0.3% at the bottom of the housing during a substantially vertical rise of the elastic arm (5) by compared to the rigid part (8) of the balance to set up the rod of the weight. Balancier (1) selon la revendication 1 ou 2, caractérisé en ce que ledit logement (10) est de forme sensiblement ovoïde avec une entrée définie par la fente (7) et un fond, le fond du logement présentant des dimensions supérieures à l'entrée du logement (10).Balance (1) according to claim 1 or 2, characterized in that said housing (10) is of substantially ovoid shape with an entrance defined by the slot (7) and a bottom, the bottom of the housing having dimensions greater than the entrance to housing (10). Balancier (1) selon l'une des revendications 1 à 3, caractérisé en ce que le bras élastique fourni une force de retenue d'au moins 0.7N lorsque la masselotte est montée.Balancer (1) according to one of claims 1 to 3, characterized in that the elastic arm provides a retaining force of at least 0.7N when the weight is mounted. Balancier (1) selon l'une des revendications 1 à 4, caractérisé en ce que ladite partie rigide (8) comprend une encoche (11) pour positionner la masselotte, la largeur de l'ouverture étant inférieure au diamètre de la tige de la masselotte.Balance wheel (1) according to one of claims 1 to 4, characterized in that said rigid part (8) comprises a notch (11) for positioning the weight, the width of the opening being less than the diameter of the shank of the weight. Balancier (1) selon l'une des revendications 1 à 5, caractérisé en ce que le bras élastique (5) est solidaire du moyeu (2).Balancer (1) according to one of claims 1 to 5, characterized in that the elastic arm (5) is integral with the hub (2). Balancier selon l'une des revendications précédentes, caractérisé en ce que ledit au moins un organe de serrage élastique (5) est monobloc avec le balancier (1).Balance according to one of the preceding claims, characterized in that said at least one elastic clamping member (5) is integral with the balance (1). Balancier selon l'une des revendications 1 à 7, caractérisé en ce qu'il comprend plusieurs bras élastiques (5), les bras élastiques étant disposés selon une symétrie centrale ayant pour centre celui du balancier.Balance according to one of claims 1 to 7, characterized in that it comprises several elastic arms (5), the elastic arms being arranged in a central symmetry having as center that of the balance. Mouvement d'horlogerie comportant au moins un balancier (1) selon l'une des revendications 1 à 8.Timepiece movement comprising at least one balance (1) according to one of claims 1 to 8. Pièce d'horlogerie comportant au moins un mouvement selon la revendication 9, caractérisée en ce qu'elle est une montre.Timepiece comprising at least one movement according to Claim 9, characterized in that it is a watch. Procédé de montage d'une masselotte (6) sur un balancier (1) selon les revendications 1 à 8, le procédé de montage comprenant les étapes suivantes : a) placer le balancier (1) sur un support et le maintenir en place ; b) placer la masselotte (6) au niveau du logement (10) de sorte que le pied (65) repose dans le logement, le pied (65) étant positionné dans l'alignement de la fente (7) ; c) déplacer la masselotte (6) selon une direction rectiligne vers la fente (7) pour loger le pied dans l'encoche (11), le pied de la masselotte écartant le bras élastique (5) lors de son déplacement. A method of mounting a weight (6) on a balance (1) according to claims 1 to 8, the mounting method comprising the following steps: a) place the balance (1) on a support and keep it in place; b) placing the weight (6) at the level of the housing (10) so that the foot (65) rests in the housing, the foot (65) being positioned in alignment with the slot (7); c) moving the weight (6) in a rectilinear direction towards the slot (7) to accommodate the foot in the notch (11), the foot of the weight separating the elastic arm (5) during its movement.
EP19173069.6A 2019-05-07 2019-05-07 Clock balance Active EP3736640B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19173069.6A EP3736640B1 (en) 2019-05-07 2019-05-07 Clock balance
US16/829,053 US11531304B2 (en) 2019-05-07 2020-03-25 Timepiece balance
JP2020068141A JP6960498B2 (en) 2019-05-07 2020-04-06 Timekeeper balance
RU2020115006A RU2745732C1 (en) 2019-05-07 2020-04-28 Clockwork balance
CN202010377677.2A CN111913381B (en) 2019-05-07 2020-05-07 Balance wheel of timepiece

Applications Claiming Priority (1)

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EP19173069.6A EP3736640B1 (en) 2019-05-07 2019-05-07 Clock balance

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EP3736640B1 EP3736640B1 (en) 2022-12-21

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CN (1) CN111913381B (en)
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JP2020183937A (en) 2020-11-12
US20200356055A1 (en) 2020-11-12
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CN111913381B (en) 2022-06-07
JP6960498B2 (en) 2021-11-05
RU2745732C1 (en) 2021-03-31
EP3736640B1 (en) 2022-12-21

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