EP1637940B1 - Collet for timepieces - Google Patents

Collet for timepieces Download PDF

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Publication number
EP1637940B1
EP1637940B1 EP05018335A EP05018335A EP1637940B1 EP 1637940 B1 EP1637940 B1 EP 1637940B1 EP 05018335 A EP05018335 A EP 05018335A EP 05018335 A EP05018335 A EP 05018335A EP 1637940 B1 EP1637940 B1 EP 1637940B1
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EP
European Patent Office
Prior art keywords
flexible structure
horological
collet
essentially
collet according
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.)
Active
Application number
EP05018335A
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German (de)
French (fr)
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EP1637940A2 (en
EP1637940A3 (en
Inventor
Sylvain Jeanneret
Andreas Kuoni
Frédéric Maier
Michel Belot
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.)
Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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
Priority claimed from CH01426/04A external-priority patent/CH698081B1/en
Application filed by Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Publication of EP1637940A2 publication Critical patent/EP1637940A2/en
Publication of EP1637940A3 publication Critical patent/EP1637940A3/en
Application granted granted Critical
Publication of EP1637940B1 publication Critical patent/EP1637940B1/en
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance
    • G04B17/345—Details of the spiral roll

Definitions

  • the present invention relates to a timepiece ferrule, more particularly a ferrule for driving a spiral on the shaft of a pendulum in a clockwork movement.
  • the ferrules found in the current watch movements are often made of steel or brass and usually deform plastically when they are driven on the balance shaft.
  • resilient ferrules are also known capable of elastically tightening the balance shaft. The latter have several advantages, including that of being made in a brittle material such as silicon.
  • Such elastic ferrules are described in the documents EP 1,513,029 and EP 1 445 670 They comprise an elastic structure surrounded by a stiffening structure.
  • the present invention aims to provide an elastic ferrule which, with respect to the known elastic ferrules, in particular that according to EP 1,513,029 or capable of exerting a larger clamping force and / or further deforming.
  • a ferrule 1 according to the invention comprises an inner flexible structure 2 adapted to receive and resiliently tighten a shaft with a circular section 3, typically a balance shaft, and an external stiffening structure 4 surrounding the flexible structure 2.
  • the stiffening structure 4 is attached to the flexible structure 2 at distinct points 5, thus defining recesses 6 between the structures 2 and 4.
  • the ferrule 1 is typically attached to the inner end of a hairspring (not shown) at a point 7.
  • the shell 1 and the hairspring can be made in one piece, for example silicon.
  • the flexible structure 2 is preferably in the form of a regular closed curve, such as a regular polygon, having a determined number of points of contact with the balance shaft 3, different from the points of attachment of the structure of the structure. rigidification 4 to the flexible structure 2.
  • the flexible structure 2 is substantially in the shape of an equilateral triangle and thus has three points of contact with the shaft 3, and its vertices correspond to the aforementioned points of attachment 5.
  • the elasticity of the structure 2 results from the relatively thin thickness in the plane of the shell of each of its sides 8 intended to be in contact with the shaft 3.
  • This thickness which, as will be seen below, is variable, is calculated so that the maximum stress exerted by the balance shaft 3 on the structure 2 is less than the elastic limit of the material forming the shell 1, the shell 1 accommodates manufacturing tolerances of the shaft balance 3 and that the holding of the ferrule 1 on the shaft 3 (torque, driving force) is adequate.
  • the flexible structure 2 Due to its closed and regular shape, the flexible structure 2 has a center of gravity which remains substantially the same before and after the driving of the shell on the shaft 3.
  • the stiffening structure 4 is also in the form of a closed curve and thus completely surrounds the flexible structure 2.
  • the stiffening structure 4 has a shape similar to that of the flexible structure 2, that is to say substantially equilateral triangular, but its vertices 9, corresponding to the points of attachment 5, that is to say to the vertices of the equilateral triangle formed by the flexible structure 2, are rounded.
  • the stiffening structure 4 has a sufficient thickness in the plane of the ferrule to almost not deform during the driving of the shell on the shaft 3 and that in particular the points of attachment 5 and thus the vertices 9 remain substantially fixed relative to the center of the ferrule 1 during this hunting.
  • the center of gravity of the ferrule 1 remains constant during the driving of the shell 1 on the balance shaft 3 but also the point 7 of attachment of the spiral to the ferrule 1. This improves the isochronism of the balance- spiral.
  • the sides 8 of the flexible structure 2 have a variable thickness in the plane of the ferrule.
  • this thickness has maxima ep0, ep1 and ep2 respectively at the center and at the two ends of each side 8 and the minima ep3 and ep4 at mid-distance between the center and the two ends of each side 8, respectively .
  • the maxima ep0, ep1 and ep2 are equal to each other and the minima ep3 and ep4 are equal to each other, as illustrated in the figure.
  • This variation in thickness of the sides 8 of the flexible structure 2 makes it possible to better distribute the stress exerted by the balance shaft 3 along each of said sides.
  • the thickness (ep0, ep1 and ep2) is large; which locally increases the resistance of the sides 8 and reduces the stress experienced by the latter, and where the sides 8 are subjected to a stress of small intensity or zero intensity, namely mid-distance between their center and their two ends respectively, the thickness (ep3 and ep4) is small, which promotes the deformation (or arrow) of the sides 8 by the balance shaft 3.
  • the sides 8 for example a greater force than in the case of ferrule according to EP 1,513,029 for the same deformation (or arrow) of said sides (with a thickness ep0 ep1, ep2 greater than the thickness of the sides of the flexible structure of the shell according to EP 1,513,029 ), to increase the clamping force of the balance shaft, or a larger deformation than in the case of the ferrule according to EP 1,513,029 for the same force exerted by the balance shaft (with a thickness ep0, ep1, ep2 equal to the thickness of the sides of the flexible structure of the shell according to EP 1,513,029 ), to make the ferrule less sensitive to manufacturing tolerances.
  • Intermediate cases are of course also possible in which both the clamping force and the deformation are increased relative to the ferrule according to EP 1,513,029 .

Abstract

The collet (1) has a flexible structure (2) elastically locking a rod (3) of a balance. The structure has sides (8) to be in contact with the rod. The sides have variable thickness such that maximum constraint exerted by the rod on the structure is lesser than the elastic limit of a material e.g. silicon, used for fabricating the structure. A rigidifying structure (4) surrounds the structure (2).

Description

La présente invention concerne une virole d'horlogerie, plus particulièrement une virole permettant le chassage d'un spiral sur l'arbre d'un balancier dans un mouvement d'horlogerie.The present invention relates to a timepiece ferrule, more particularly a ferrule for driving a spiral on the shaft of a pendulum in a clockwork movement.

Les viroles que l'on trouve dans les mouvements d'horlogerie actuels sont souvent en acier ou en laiton et, généralement, se déforment plastiquement lors de leur chassage sur l'arbre du balancier. Toutefois, on connaît également des viroles élastiques aptes à serrer élastiquement l'arbre du balancier. Ces dernières présentent plusieurs avantages, dont celui de pouvoir être réalisées dans une matière cassante telle que le silicium. De telles viroles élastiques sont décrites dans les documents EP 1 513 029 et EP 1 445 670 Elles comprennent une structure élastique entourée par une structure de rigidification.The ferrules found in the current watch movements are often made of steel or brass and usually deform plastically when they are driven on the balance shaft. However, resilient ferrules are also known capable of elastically tightening the balance shaft. The latter have several advantages, including that of being made in a brittle material such as silicon. Such elastic ferrules are described in the documents EP 1,513,029 and EP 1 445 670 They comprise an elastic structure surrounded by a stiffening structure.

La présente invention vise à fournir une virole élastique qui, par rapport aux viroles élastiques connues, en particulier celle selon EP 1 513 029 , soit capable d'exercer une force de serrage plus importante et/ou de se déformer davantage.The present invention aims to provide an elastic ferrule which, with respect to the known elastic ferrules, in particular that according to EP 1,513,029 or capable of exerting a larger clamping force and / or further deforming.

A cette fin, il est prévu une virole selon la revendication 1 annexée, des modes de réalisation particuliers de cette virole étant définis dans les revendications dépendantes.To this end, there is provided a ferrule according to claim 1 attached, particular embodiments of this ferrule being defined in the dependent claims.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée suivante faite en référence à la figure annexée qui représente en vue de dessus une virole d'horlogerie selon un mode de réalisation préférentiel de l'invention.Other features and advantages of the present invention will appear on reading the following detailed description with reference to the appended figure which shows a top view of a clockwork ferrule according to a preferred embodiment of the invention.

En référence à la figure annexée, une virole 1 selon l'invention comprend une structure flexible intérieure 2 apte à recevoir et serrer élastiquement un arbre à section circulaire 3, typiquement un arbre de balancier, et une structure de rigidification extérieure 4 entourant la structure flexible 2. La structure de rigidification 4 est rattachée à la structure flexible 2 en des points distincts 5, définissant ainsi des évidements 6 entre les structures 2 et 4. La virole 1 est typiquement rattachée à l'extrémité intérieure d'un spiral (non représenté) en un point 7. La virole 1 et le spiral peuvent être réalisés en une seule pièce, par exemple en silicium.Referring to the attached figure, a ferrule 1 according to the invention comprises an inner flexible structure 2 adapted to receive and resiliently tighten a shaft with a circular section 3, typically a balance shaft, and an external stiffening structure 4 surrounding the flexible structure 2. The stiffening structure 4 is attached to the flexible structure 2 at distinct points 5, thus defining recesses 6 between the structures 2 and 4. The ferrule 1 is typically attached to the inner end of a hairspring (not shown) at a point 7. The shell 1 and the hairspring can be made in one piece, for example silicon.

La structure flexible 2 est de préférence sous la forme d'une courbe fermée régulière, telle qu'un polygone régulier, ayant un nombre déterminé de points de contact avec l'arbre de balancier 3, différents des points 5 de rattachement de la structure de rigidification 4 à la structure flexible 2. Dans l'exemple illustré, la structure flexible 2 est sensiblement en forme de triangle équilatéral et possède ainsi trois points de contact avec l'arbre 3, et ses sommets correspondent aux points de rattachement précités 5.The flexible structure 2 is preferably in the form of a regular closed curve, such as a regular polygon, having a determined number of points of contact with the balance shaft 3, different from the points of attachment of the structure of the structure. rigidification 4 to the flexible structure 2. In the example illustrated, the flexible structure 2 is substantially in the shape of an equilateral triangle and thus has three points of contact with the shaft 3, and its vertices correspond to the aforementioned points of attachment 5.

L'élasticité de la structure 2 résulte de l'épaisseur, relativement mince, dans le plan de la virole de chacun de ses côtés 8 destinés à être contact avec l'arbre 3. Cette épaisseur qui, comme on le verra plus loin, est variable, est calculée de manière que la contrainte maximale exercée par l'arbre de balancier 3 sur la structure 2 soit inférieure à la limite élastique du matériau formant la virole 1, que la virole 1 s'accommode des tolérances de fabrication de l'arbre de balancier 3 et que la tenue de la virole 1 sur l'arbre 3 (couple de rotation, force de chassage) soit adéquate. Grâce à sa forme fermée et régulière, la structure flexible 2 a un centre de gravité qui reste sensiblement le même avant et après le chassage de la virole sur l'arbre 3.The elasticity of the structure 2 results from the relatively thin thickness in the plane of the shell of each of its sides 8 intended to be in contact with the shaft 3. This thickness, which, as will be seen below, is variable, is calculated so that the maximum stress exerted by the balance shaft 3 on the structure 2 is less than the elastic limit of the material forming the shell 1, the shell 1 accommodates manufacturing tolerances of the shaft balance 3 and that the holding of the ferrule 1 on the shaft 3 (torque, driving force) is adequate. Due to its closed and regular shape, the flexible structure 2 has a center of gravity which remains substantially the same before and after the driving of the shell on the shaft 3.

De préférence, la structure de rigidification 4 est également sous la forme d'une courbe fermée et entoure ainsi complètement la structure flexible 2. Dans l'exemple illustré, la structure de rigidification 4 a une forme similaire à celle de la structure flexible 2, c'est-à-dire sensiblement triangulaire équilatérale, mais ses sommets 9, correspondant aux points de rattachement 5, c'est-à-dire aux sommets du triangle équilatéral formé par la structure flexible 2, sont arrondis. La structure de rigidification 4 a une épaisseur suffisante dans le plan de la virole pour quasiment ne pas se déformer lors du chassage de la virole sur l'arbre 3 et pour qu'en particulier les points de rattachement 5 et donc les sommets 9 restent sensiblement fixes par rapport au centre de la virole 1 lors de ce chassage. Ainsi, non seulement le centre de gravité de la virole 1 reste constant lors du chassage de la virole 1 sur l'arbre de balancier 3 mais également le point 7 de rattachement du spiral à la virole 1. Ceci améliore l'isochronisme du balancier-spiral.Preferably, the stiffening structure 4 is also in the form of a closed curve and thus completely surrounds the flexible structure 2. In the example illustrated, the stiffening structure 4 has a shape similar to that of the flexible structure 2, that is to say substantially equilateral triangular, but its vertices 9, corresponding to the points of attachment 5, that is to say to the vertices of the equilateral triangle formed by the flexible structure 2, are rounded. The stiffening structure 4 has a sufficient thickness in the plane of the ferrule to almost not deform during the driving of the shell on the shaft 3 and that in particular the points of attachment 5 and thus the vertices 9 remain substantially fixed relative to the center of the ferrule 1 during this hunting. Thus, not only the center of gravity of the ferrule 1 remains constant during the driving of the shell 1 on the balance shaft 3 but also the point 7 of attachment of the spiral to the ferrule 1. This improves the isochronism of the balance- spiral.

Conformément à l'invention, les côtés 8 de la structure flexible 2 ont une épaisseur variable dans le plan de la virole. Dans l'exemple illustré, cette épaisseur présente des maxima ep0, ep1 et ep2 respectivement au centre et aux deux extrémités de chaque côté 8 et des minima ep3 et ep4 à mi-distance entre le centre et les deux extrémités de chaque côté 8, respectivement. De préférence, les maxima ep0, ep1 et ep2 sont égaux entre eux et les minima ep3 et ep4 sont égaux entre eux, comme illustré sur la figure.According to the invention, the sides 8 of the flexible structure 2 have a variable thickness in the plane of the ferrule. In the illustrated example, this thickness has maxima ep0, ep1 and ep2 respectively at the center and at the two ends of each side 8 and the minima ep3 and ep4 at mid-distance between the center and the two ends of each side 8, respectively . Preferably, the maxima ep0, ep1 and ep2 are equal to each other and the minima ep3 and ep4 are equal to each other, as illustrated in the figure.

Cette variation d'épaisseur des côtés 8 de la structure flexible 2 permet de mieux répartir la contrainte exercée par l'arbre de balancier 3 le long de chacun desdits côtés. Ainsi, là où les côtés 8 sont soumis à une force de grande intensité, à savoir dans leur partie centrale en contact avec l'arbre de balancier et à leurs deux extrémités, l'épaisseur (ep0, ep1 et ep2) est grande, ce qui localement augmente la résistance des côtés 8 et diminue la contrainte subie par ces derniers, et là où les côtés 8 sont soumis à une contrainte de petite intensité, voire d'intensité nulle, à savoir à mi-distance entre leur centre et leurs deux extrémités respectivement, l'épaisseur (ep3 et ep4) est petite, ce qui favorise la déformation (ou flèche) des côtés 8 par l'arbre de balancier 3. De cette manière, il est possible de faire subir aux côtés 8 par exemple une force plus grande que dans le cas de la virole selon EP 1 513 029 pour une même déformation (ou flèche) desdits côtés (avec une épaisseur ep0 ep1, ep2 supérieure à l'épaisseur des côtés de la structure flexible de la virole selon EP 1 513 029 ), pour augmenter la force de serrage de l'arbre de balancier, ou une déformation plus grande que dans le cas de la virole selon EP 1 513 029 pour une même force exercée par l'arbre de balancier (avec une épaisseur ep0, ep1, ep2 égale à l'épaisseur des côtés de la structure flexible de la virole selon EP 1 513 029 ), pour rendre la virole moins sensible aux tolérances de fabrication. Des cas intermédiaires sont bien entendu également possibles dans lesquels à la fois la force de serrage et la déformation sont augmentées par rapport à la virole selon EP 1 513 029 .This variation in thickness of the sides 8 of the flexible structure 2 makes it possible to better distribute the stress exerted by the balance shaft 3 along each of said sides. Thus, where the sides 8 are subjected to a force of great intensity, namely in their central part in contact with the balance shaft and at their two ends, the thickness (ep0, ep1 and ep2) is large; which locally increases the resistance of the sides 8 and reduces the stress experienced by the latter, and where the sides 8 are subjected to a stress of small intensity or zero intensity, namely mid-distance between their center and their two ends respectively, the thickness (ep3 and ep4) is small, which promotes the deformation (or arrow) of the sides 8 by the balance shaft 3. In this way, it is possible to subject the sides 8 for example a greater force than in the case of ferrule according to EP 1,513,029 for the same deformation (or arrow) of said sides (with a thickness ep0 ep1, ep2 greater than the thickness of the sides of the flexible structure of the shell according to EP 1,513,029 ), to increase the clamping force of the balance shaft, or a larger deformation than in the case of the ferrule according to EP 1,513,029 for the same force exerted by the balance shaft (with a thickness ep0, ep1, ep2 equal to the thickness of the sides of the flexible structure of the shell according to EP 1,513,029 ), to make the ferrule less sensitive to manufacturing tolerances. Intermediate cases are of course also possible in which both the clamping force and the deformation are increased relative to the ferrule according to EP 1,513,029 .

Claims (9)

  1. Horological collet with a flexible structure (2) having a closed shape apt to elastically clamp an arbor (3) of circular cross section, the flexible structure (2) comprising sides (8) designed to be each in contact with the arbor (3) in a determined point, characterised in that the said sides (8) have, in the plane of the collet, a variable thickness having maxima (ep0, ep1, ep2) essentially at the said determined point and at the two ends of each side (8) respectively and minima (ep3, ep4) between the said determined point and the two ends of each side (8) respectively, to ensure a better distribution of stresses sustained by the flexible structure (2) when it is driven on the arbor (3).
  2. Horological collet according to claim 1, characterised in that the flexible structure (2) has an essentially regular shape.
  3. Horological collet according to claim 2, characterised in that the flexible structure (2) has an essentially equilateral triangular shape.
  4. Horological collet according to claim 2 or 3, characterised in that the said variable thickness has maxima (ep0, ep1, ep2) essentially at the centre and at the two ends of each side (8) respectively and minima (ep3, ep4) essentially half-way between the centre and the two ends of each side (8) respectively.
  5. Horological collet according to claim 4, characterised in that the maxima (ep0, ep1, ep2) are essentially equal to each other and the minima (ep3, ep4) are essentially equal to each other.
  6. Horological collet according to any one of claims 1 to 5, characterised in that it further comprises a rigidifying structure (4) outside the flexible structure (2) and attached to this latter in at least one point (5).
  7. Horological collet according to claim 6, characterised in that the rigidifying structure (4) is attached to the flexible structure (2) in different points (5).
  8. Horological collet according to claim 6 or 7, characterised in that the rigidifying structure (4) has a closed shape.
  9. Horological collet according to claim 8 when it depends at least on claim 3, characterised in that the rigidifying structure (4) is attached to the flexible structure (2) in three points (5) corresponding to the corners of the equilateral triangle defined by the flexible structure (2).
EP05018335A 2004-08-31 2005-08-24 Collet for timepieces Active EP1637940B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01426/04A CH698081B1 (en) 2003-09-02 2004-08-31 Ferrule watch together spiral-ring and spring balance.

Publications (3)

Publication Number Publication Date
EP1637940A2 EP1637940A2 (en) 2006-03-22
EP1637940A3 EP1637940A3 (en) 2010-08-04
EP1637940B1 true EP1637940B1 (en) 2011-07-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05018335A Active EP1637940B1 (en) 2004-08-31 2005-08-24 Collet for timepieces

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EP (1) EP1637940B1 (en)
AT (1) ATE517374T1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1826635B1 (en) * 2006-02-24 2009-10-14 Patek, Philippe SA Resilient fastening device for horology
EP1857891A1 (en) 2006-05-17 2007-11-21 Patek Philippe Sa Hairspring-collet assembly for a timepiece movement
EP1868045B1 (en) * 2006-06-12 2019-02-20 Patek Philippe SA Genève Horological collet
CH704016B1 (en) * 2010-10-15 2019-01-31 Eta Sa Mft Horlogere Suisse Assembly of a part not having a plastic field.
EP3098669A1 (en) * 2014-03-05 2016-11-30 Nivarox-FAR S.A. Hairspring intended for being clamped by a spring washer
EP3309625B1 (en) * 2016-10-13 2020-07-29 Nivarox-FAR S.A. Hairspring intended for being attached by a spring washer
EP3401740B1 (en) * 2017-05-12 2021-03-31 Patek Philippe SA Genève Flashless timepiece setting component
EP3671364A1 (en) * 2018-12-17 2020-06-24 Nivarox-FAR S.A. Elastic holding member for fixing a timepiece component on a support element

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252387A (en) * 1945-05-15 1947-12-31 Marti Fritz Ferrule for instant fixing of a balance spring.
CH1583371A4 (en) * 1971-02-10 1973-08-31
EP1302821A3 (en) * 2001-10-10 2010-05-05 Franck Muller-Watchland SA Balance-spring for time measuring apparatus
EP1445670A1 (en) * 2003-02-06 2004-08-11 ETA SA Manufacture Horlogère Suisse Balance-spring resonator spiral and its method of fabrication
EP1513029B1 (en) 2003-09-02 2008-10-15 Patek, Philippe SA Horological collet
EP1584994B1 (en) * 2004-04-06 2009-01-21 Nivarox-FAR S.A. Collet without deformation of the spiral fixing radius and fabrication method of such a collet

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Publication number Publication date
ATE517374T1 (en) 2011-08-15
EP1637940A2 (en) 2006-03-22
EP1637940A3 (en) 2010-08-04

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