EP1837717B1 - Timepiece and barrel provided with an improved fixation of the barrel cap - Google Patents

Timepiece and barrel provided with an improved fixation of the barrel cap Download PDF

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Publication number
EP1837717B1
EP1837717B1 EP06111644A EP06111644A EP1837717B1 EP 1837717 B1 EP1837717 B1 EP 1837717B1 EP 06111644 A EP06111644 A EP 06111644A EP 06111644 A EP06111644 A EP 06111644A EP 1837717 B1 EP1837717 B1 EP 1837717B1
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EP
European Patent Office
Prior art keywords
drum
barrel
skirt
axial
cover
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Application number
EP06111644A
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German (de)
French (fr)
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EP1837717A1 (en
Inventor
Jean-Marc Berney
Dominique Léchot
Alain Zaugg
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Montres Breguet SA
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Montres Breguet SA
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Publication date
Application filed by Montres Breguet SA filed Critical Montres Breguet SA
Priority to AT06111644T priority Critical patent/ATE470176T1/en
Priority to EP06111644A priority patent/EP1837717B1/en
Priority to DE602006014650T priority patent/DE602006014650D1/en
Publication of EP1837717A1 publication Critical patent/EP1837717A1/en
Application granted granted Critical
Publication of EP1837717B1 publication Critical patent/EP1837717B1/en
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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
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
    • G04B43/002—Component shock protection arrangements
    • 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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/16—Barrels; Arbors; Barrel axles

Definitions

  • the invention relates to a barrel for a timepiece having a lid.
  • the invention more particularly relates to a barrel for a timepiece comprising a cylindrical drum in which is housed a barrel spring, a barrel shaft on which is fixed an end of the spring, and a lid which closes the drum at its end. upper axial, wherein the cover has a disc-shaped main body and a lower peripheral axial skirt which is driven on the outer axial wall of the drum to retain the lid on the drum.
  • a barrel of this type is described for example in the document CH 140 771 .
  • the lid is secured to the drum by means of a notch formed in the upper end of the drum and a complementary shape in the axial skirt.
  • the invention aims to overcome this disadvantage by proposing a barrel having a fixing system on the drum which is more reliable.
  • the invention aims to provide a solution that does not substantially modify the external dimensions of the barrel, and that does not decrease the internal volume of the barrel.
  • the invention proposes a barrel of the type mentioned above, characterized in that the outer axial wall of the drum comprises a first radial surface oriented downwards, in that the inner face of the axial skirt comprises a second radial surface. pointing upwards, and in that the two radial surfaces are facing each other so as to axially retain the lid on the drum in case of impact.
  • the two radial surfaces are annular and consist of shoulders arranged in the respective walls of the axial skirt and the drum.
  • the outer axial wall of the drum comprises an annular radial groove which is delimited axially upwards by the first radial surface and axially downwardly by a third annular radial surface facing upwards.
  • the axial skirt has at its lower axial end an inner chamfer and the outer edge of the upper axial end of the drum is chamfered.
  • the lower face of the main body has a peripheral annular groove which is adjacent to the axial skirt and the outer edge of the upper axial end of the axial skirt is chamfered.
  • the invention also proposes a timepiece according to claim 1.
  • a vertical axial orientation along the axis A1 of the barrel 10 will be used without limitation.
  • the axis A1 could be oriented differently without modifying the structure and operation of the invention. .
  • the barrel 10 comprises a cylindrical drum 12 in which is housed a barrel spring 14, a barrel shaft 16 on which is fixed a first end 18 of the spring 14, and a lid 20 which closes the drum 12 at its upper axial end.
  • the spring 14 is a spiral-shaped blade wound around the shaft 16.
  • the drum 12 has a clearance 22 in its inner axial wall 24 which allows the attachment of a second end 26 of the spring 14.
  • the drum 12 is here closed at its lower axial end by a bottom wall 28 and has on its outer axial wall 30 a toothing 32 designed to transmit the torque provided by the spring 14 to the gear train (not shown) of the movement equipping the workpiece watchmaking.
  • the cover 20 has a disc-shaped main body 34 and a lower peripheral axial skirt 36 which is driven on the upper axial end section 38 of the outer axial wall 26 of the drum 12 so as to retain the cover 20 on the drum 12.
  • the lid 20 is preferably made in one piece.
  • the outer axial wall 30 of the drum 12 has a first radial surface 40 oriented downwards
  • the inner face 42 of the axial skirt 36 has a second radial surface 44 facing upwards
  • both radial surfaces 40, 44 are arranged facing one another.
  • the two radial surfaces 40, 44 are annular so that they extend over the entire circumference of the cylinder 10.
  • the second radial surface 44 is constituted by a shoulder formed in the inner face 42 of the axial skirt 36 and the first surface.
  • radial 40 is constituted by a shoulder formed in the outer axial wall 30 of the drum 12.
  • the outer axial wall 30 of the drum 12 comprises an annular radial groove 46 which is delimited axially upwards by the first radial surface 40 and axially downwards by a third annular radial surface 48 facing upwards. .
  • the axial skirt 36 has at its lower axial end an inner chamfer 50 and, at its upper axial end, the outer edge 52, which here corresponds to the outer peripheral edge of the main body 34 of the cover 20, is chamfered.
  • the outer edge 53 of the upper axial end of the drum 12 is also chamfered.
  • the upper axial end portion 38 of the outer axial wall 26 of the drum 12 is frustoconical of increasing diameter upwards.
  • the inner face 42 of the axial skirt 36 also comprises a complementary concave frustoconical section of the convex section 38 of the drum 12 to enable the axial skirt 36 to be driven on the drum 12.
  • the outer face 55 of the axial skirt 36 has a convex frustoconical shape of diameter increasing towards the top, so that the outer face 55 and the inner face 42 are here parallel.
  • the lower face 54 of the main body 34 of the cover 20 has a peripheral annular groove 56 adjacent to the axial skirt 36 and whose function will be explained later.
  • the annular groove 56 is bounded inwardly by an axial surface 58 and outwardly by a frustoconical surface 60 of increasing diameter downwards.
  • the cover 20 is mounted on the drum 12 in the following manner.
  • the cover 20 is moved axially towards the drum 12 until the inner chamfer 50 of the axial skirt 36 bears against the chamfered outer edge 53 of the drum 12. It should be noted that the two chamfered elements help to center the cover 20 relative to the drum 12.
  • the chamfered outer edge 53 controls the deformation of the axial skirt 36 towards the outside, which allows the passage of the lower end of the axial skirt 36 comprising the second radial surface 44.
  • the deformation of the axial skirt 36 is aided by the presence of the annular groove 56 and the chamfer on the outer edge 52 of the axial skirt 36 since the reduction in material thickness at this point of the cover 20 defines a hinge. This limits the risk of permanent deformation of the axial skirt 36, which ensures a secure attachment of the cover 20 on the drum 12, including in case of violent impact.
  • the axial skirt 36 folds inwards and tightens against the frustoconical section 38 of the drum 12. The lower axial end of the axial skirt 36 is then partially received in the groove 46.
  • a barrel 10 is thus obtained with a very good adjustment of the lid 20 on the drum 12, and a holding of the lid 20 which is exerted on the entire circumference of the barrel 10.
  • the arrangement for mounting the lid 20 on the drum 12 according to the invention is particularly suitable for a barrel 10 having a high diameter to height ratio because it improves the fixing of the lid 20 without complicating assembly operations and without penalize the usable volume inside the drum 12 for the spring 14.
  • the external size of the barrel 10 according to the invention is not modified which facilitates its arrangement in a timepiece movement such as a wristwatch where the space available is particularly limited.

Abstract

The barrel has a cover (20) closing a cylindrical drum (12) at its upper axial end and comprising a lower peripheral axial skirt (36) driven on an outer axial wall (30) of the drum for retaining the cover on the drum. The outer axial wall of the drum has a radial surface (40) that is oriented towards the bottom. The axial skirt of the cover comprises an inner side (42) having a radial surface (44) that is oriented towards the top. The radial surfaces (40, 44) are provided facing each other in a manner to axially retain the cover on the drum in case of a shock.

Description

L'invention concerne un barillet pour une pièce d'horlogerie comportant un couvercle.The invention relates to a barrel for a timepiece having a lid.

L'invention concerne plus particulièrement un barillet pour une pièce d'horlogerie comportant un tambour cylindrique dans lequel est logé un ressort de barillet, un arbre de barillet sur lequel est fixé une extrémité du ressort, et un couvercle qui ferme le tambour à son extrémité axiale supérieure, dans lequel le couvercle comporte un corps principal en forme de disque et une jupe axiale périphérique inférieure qui est chassée sur la paroi axiale externe du tambour pour retenir le couvercle sur le tambour.The invention more particularly relates to a barrel for a timepiece comprising a cylindrical drum in which is housed a barrel spring, a barrel shaft on which is fixed an end of the spring, and a lid which closes the drum at its end. upper axial, wherein the cover has a disc-shaped main body and a lower peripheral axial skirt which is driven on the outer axial wall of the drum to retain the lid on the drum.

Un barillet de ce type est décrit par exemple dans le document CH 140 771 . Dans ce document, le couvercle est rendu solidaire du tambour au moyen d'un cran formé dans l'extrémité supérieure du tambour et d'une forme complémentaire dans la jupe axiale.A barrel of this type is described for example in the document CH 140 771 . In this document, the lid is secured to the drum by means of a notch formed in the upper end of the drum and a complementary shape in the axial skirt.

Avec ce type de barillet, il arrive que le couvercle se désolidarise du tambour, en particulier en cas de choc violent. Ce problème se rencontre plus particulièrement dans le cas d'un barillet avec un rapport diamètre sur hauteur élevé, ce qui est par exemple le cas d'un barillet ayant un diamètre de tambour d'environ 14 millimètres et une hauteur axiale d'environ 1,4 millimètres, par opposition aux barillets de petit diamètre tel qu'un barillet ayant un diamètre de 8 millimètres et une hauteur de 1,23 millimètres. On désigne ici par "diamètre de barillet" le diamètre externe du tambour de barillet, sans compter la denture externe.With this type of barrel, it happens that the lid disengages from the drum, especially in case of violent impact. This problem is encountered more particularly in the case of a barrel with a high diameter to height ratio, which is for example the case of a barrel having a drum diameter of about 14 millimeters and an axial height of about 1 , 4 millimeters, as opposed to small diameter barrels such as a barrel with a diameter of 8 millimeters and a height of 1.23 millimeters. The term "barrel diameter" is used here to denote the outer diameter of the barrel drum, not counting the external toothing.

L'invention vise notamment à remédier à cet inconvénient en proposant un barillet comportant un système de fixation sur le tambour qui soit plus fiable.The invention aims to overcome this disadvantage by proposing a barrel having a fixing system on the drum which is more reliable.

De plus, l'invention vise à proposer une solution qui ne modifie pas essentiellement l'encombrement extérieur du barillet, et qui ne diminue pas le volume intérieur du barillet.In addition, the invention aims to provide a solution that does not substantially modify the external dimensions of the barrel, and that does not decrease the internal volume of the barrel.

Dans ce but, l'invention propose un barillet du type mentionné précédemment, caractérisé en ce que la paroi axiale externe du tambour comporte une première surface radiale orientée vers le bas, en ce que la face interne de la jupe axiale comporte une seconde surface radiale orientée vers le haut, et en ce que les deux surfaces radiales sont en regard l'une de l'autre de manière à retenir axialement le couvercle sur le tambour en cas de choc.For this purpose, the invention proposes a barrel of the type mentioned above, characterized in that the outer axial wall of the drum comprises a first radial surface oriented downwards, in that the inner face of the axial skirt comprises a second radial surface. pointing upwards, and in that the two radial surfaces are facing each other so as to axially retain the lid on the drum in case of impact.

Selon des caractéristiques avantageuses, les deux surfaces radiales sont annulaires et sont constituées par des épaulements aménagés dans les parois respectives de la jupe axiale et du tambour. De plus, la paroi axiale externe du tambour comporte une gorge radiale annulaire qui est délimitée axialement vers le haut par la première surface radiale et axialement vers le bas par une troisième surface radiale annulaire orientée vers le haut. Ainsi, la fabrication du barillet selon l'invention est particulièrement simple. Elle ne nécessite pas de modifier de manière essentielle la structure du barillet utilisé habituellement, et elle ne modifie pas son encombrement.According to advantageous characteristics, the two radial surfaces are annular and consist of shoulders arranged in the respective walls of the axial skirt and the drum. In addition, the outer axial wall of the drum comprises an annular radial groove which is delimited axially upwards by the first radial surface and axially downwardly by a third annular radial surface facing upwards. Thus, the manufacture of the cylinder according to the invention is particularly simple. It does not need to substantially modify the structure of the barrel usually used, and it does not change its size.

Avantageusement, la jupe axiale comporte à son extrémité axiale inférieure un chanfrein intérieur et le bord extérieur de l'extrémité axiale supérieure du tambour est chanfreiné. La face inférieure du corps principal comporte une rainure annulaire périphérique qui est adjacente à la jupe axiale et le bord extérieur de l'extrémité axiale supérieure de la jupe axiale est chanfreiné. Ces caractéristiques contribuent à faciliter la déformation de la jupe axiale vers l'extérieur lors du montage du couvercle sur le tambour.Advantageously, the axial skirt has at its lower axial end an inner chamfer and the outer edge of the upper axial end of the drum is chamfered. The lower face of the main body has a peripheral annular groove which is adjacent to the axial skirt and the outer edge of the upper axial end of the axial skirt is chamfered. These features contribute to facilitate the deformation of the axial skirt outwardly when mounting the lid on the drum.

L'invention propose aussi une pièce d'horlogerie selon la revendication 1.The invention also proposes a timepiece according to claim 1.

D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description détaillée qui suit, faite en référence aux dessins annexés donnés à titre d'exemple non limitatifs et dans lesquels :

  • la figure 1 est une vue en perspective éclatée qui représente schématiquement un barillet de pièce d'horlogerie réalisé conformément aux enseignements de l'invention ;
  • la figure 2 est une demi coupe axiale selon le plan II-II qui représente schématiquement le barillet de la figure 1.
Other features and advantages of the present invention will appear more clearly on reading the detailed description which follows, made with reference to the accompanying drawings given by way of non-limiting example and in which:
  • the figure 1 is an exploded perspective view which schematically shows a timepiece barrel made according to the teachings of the invention;
  • the figure 2 is a half axial section along plane II-II which schematically represents the barrel of the figure 1 .

On a représenté sur les figures 1 et 2 un barillet 10 d'axe A1 destiné à équiper une pièce d'horlogerie (non représentée) et réalisé conformément aux enseignements de l'invention.We have shown on figures 1 and 2 a barrel 10 of axis A1 intended to equip a timepiece (not shown) and made according to the teachings of the invention.

Dans la suite de la description, on utilisera à titre non limitatif une orientation axiale verticale suivant l'axe A1 du barillet 10. Bien entendu, l'axe A1 pourrait être orienté différemment sans que cela modifie la structure et le fonctionnement de l'invention.In the remainder of the description, a vertical axial orientation along the axis A1 of the barrel 10 will be used without limitation. Of course, the axis A1 could be oriented differently without modifying the structure and operation of the invention. .

Le barillet 10 comporte un tambour 12 cylindrique dans lequel est logé un ressort 14 de barillet, un arbre 16 de barillet sur lequel est fixé une première extrémité 18 du ressort 14, et un couvercle 20 qui ferme le tambour 12 à son extrémité axiale supérieure.The barrel 10 comprises a cylindrical drum 12 in which is housed a barrel spring 14, a barrel shaft 16 on which is fixed a first end 18 of the spring 14, and a lid 20 which closes the drum 12 at its upper axial end.

Le ressort 14 est une lame en forme de spirale enroulée autour de l'arbre 16. Le tambour 12 comporte un dégagement 22 dans sa paroi axiale interne 24 qui permet la fixation d'une seconde extrémité 26 du ressort 14.The spring 14 is a spiral-shaped blade wound around the shaft 16. The drum 12 has a clearance 22 in its inner axial wall 24 which allows the attachment of a second end 26 of the spring 14.

Le tambour 12 est ici fermé à son extrémité axiale inférieure par une paroi de fond 28 et il comporte sur sa paroi axiale externe 30 une denture 32 prévue pour transmettre le couple fourni par le ressort 14 au rouage (non représenté) du mouvement équipant la pièce d'horlogerie.The drum 12 is here closed at its lower axial end by a bottom wall 28 and has on its outer axial wall 30 a toothing 32 designed to transmit the torque provided by the spring 14 to the gear train (not shown) of the movement equipping the workpiece watchmaking.

Le couvercle 20 comporte un corps principal 34 en forme de disque et une jupe axiale 36 périphérique inférieure qui est chassée sur le tronçon 38 d'extrémité axiale supérieure de la paroi axiale externe 26 du tambour 12 de manière à retenir le couvercle 20 sur le tambour 12. Le couvercle 20 est réalisé de préférence en une seule pièce.The cover 20 has a disc-shaped main body 34 and a lower peripheral axial skirt 36 which is driven on the upper axial end section 38 of the outer axial wall 26 of the drum 12 so as to retain the cover 20 on the drum 12. The lid 20 is preferably made in one piece.

Conformément aux enseignements de l'invention, la paroi axiale externe 30 du tambour 12 comporte une première surface radiale 40 orientée vers le bas, la face interne 42 de la jupe axiale 36 comporte une seconde surface radiale 44 orientée vers le haut, et les deux surfaces radiales 40, 44 sont agencées en regard l'une de l'autre. Ainsi, en cas de choc, le couvercle 20 est retenu axialement sur le tambour 12 par la venue en butée axiale de la seconde surface radiale 44 contre la première surface radiale 40.According to the teachings of the invention, the outer axial wall 30 of the drum 12 has a first radial surface 40 oriented downwards, the inner face 42 of the axial skirt 36 has a second radial surface 44 facing upwards, and both radial surfaces 40, 44 are arranged facing one another. Thus, in the event of impact, the cover 20 is retained axially on the drum 12 by the axial abutment of the second radial surface 44 against the first radial surface 40.

Les deux surfaces radiales 40, 44 sont annulaires de sorte qu'elles s'étendent sur toute la circonférence du barillet 10. La seconde surface radiale 44 est constituée par un épaulement aménagé dans la face interne 42 de la jupe axiale 36 et la première surface radiale 40 est constituée par un épaulement aménagé dans la paroi axiale externe 30 du tambour 12.The two radial surfaces 40, 44 are annular so that they extend over the entire circumference of the cylinder 10. The second radial surface 44 is constituted by a shoulder formed in the inner face 42 of the axial skirt 36 and the first surface. radial 40 is constituted by a shoulder formed in the outer axial wall 30 of the drum 12.

Selon un mode de réalisation préféré, la paroi axiale externe 30 du tambour 12 comporte une gorge 46 radiale annulaire qui est délimitée axialement vers le haut par la première surface radiale 40 et axialement vers le bas par une troisième surface radiale 48 annulaire orientée vers le haut.According to a preferred embodiment, the outer axial wall 30 of the drum 12 comprises an annular radial groove 46 which is delimited axially upwards by the first radial surface 40 and axially downwards by a third annular radial surface 48 facing upwards. .

De préférence, la jupe axiale 36 comporte à son extrémité axiale inférieure un chanfrein intérieur 50 et, à son extrémité axiale supérieure, le bord extérieur 52, qui correspond ici au bord périphérique extérieur du corps principal 34 du couvercle 20, est chanfreiné. De plus, le bord extérieur 53 de l'extrémité axiale supérieure du tambour 12 est lui aussi chanfreiné. Ces caractéristiques visent à faciliter la déformation de la jupe axiale 36 vers l'extérieur, lors du montage du couvercle 20 sur le tambour 12, comme on le verra par la suite.Preferably, the axial skirt 36 has at its lower axial end an inner chamfer 50 and, at its upper axial end, the outer edge 52, which here corresponds to the outer peripheral edge of the main body 34 of the cover 20, is chamfered. In addition, the outer edge 53 of the upper axial end of the drum 12 is also chamfered. These features are intended to facilitate the deformation of the axial skirt 36 to the outside, during assembly of the cover 20 on the drum 12, as will be seen later.

Le tronçon 38 d'extrémité axiale supérieure de la paroi axiale externe 26 du tambour 12 est tronconique de diamètre croissant vers le haut. La face interne 42 de la jupe axiale 36 comporte également un tronçon tronconique concave complémentaire du tronçon 38 convexe du tambour 12 pour permettre le chassage de la jupe axiale 36 sur le tambour 12.The upper axial end portion 38 of the outer axial wall 26 of the drum 12 is frustoconical of increasing diameter upwards. The inner face 42 of the axial skirt 36 also comprises a complementary concave frustoconical section of the convex section 38 of the drum 12 to enable the axial skirt 36 to be driven on the drum 12.

La face externe 55 de la jupe axiale 36 a une forme tronconique convexe de diamètre croissant vers le haut, de sorte que la face externe 55 et la face interne 42 sont ici parallèles.The outer face 55 of the axial skirt 36 has a convex frustoconical shape of diameter increasing towards the top, so that the outer face 55 and the inner face 42 are here parallel.

Avantageusement, la face inférieure 54 du corps principal 34 du couvercle 20 comporte une rainure annulaire 56 périphérique adjacente à la jupe axiale 36 et dont la fonction sera expliquée par la suite. La rainure annulaire 56 est délimitée vers l'intérieur par une surface axiale 58 et vers l'extérieur par une surface tronconique 60 de diamètre croissant vers le bas.Advantageously, the lower face 54 of the main body 34 of the cover 20 has a peripheral annular groove 56 adjacent to the axial skirt 36 and whose function will be explained later. The annular groove 56 is bounded inwardly by an axial surface 58 and outwardly by a frustoconical surface 60 of increasing diameter downwards.

Le montage du couvercle 20 sur le tambour 12 est réalisé de la manière suivante.The cover 20 is mounted on the drum 12 in the following manner.

Le couvercle 20 est déplacé axialement vers le tambour 12 jusqu'à ce que le chanfrein intérieur 50 de la jupe axiale 36 vienne en appui contre le bord extérieur 53 chanfreiné du tambour 12. On note que les deux éléments chanfreinés aident au centrage du couvercle 20 par rapport au tambour 12.The cover 20 is moved axially towards the drum 12 until the inner chamfer 50 of the axial skirt 36 bears against the chamfered outer edge 53 of the drum 12. It should be noted that the two chamfered elements help to center the cover 20 relative to the drum 12.

En pressant le couvercle 20 contre l'extrémité axiale supérieure du tambour 12, le bord extérieur 53 chanfreiné commande la déformation de la jupe axiale 36 vers l'extérieur ce qui permet le passage de l'extrémité inférieure de la jupe axiale 36 comprenant la seconde surface radiale 44. La déformation de la jupe axiale 36 est aidée par la présence de la rainure annulaire 56 et par le chanfrein sur le bord extérieur 52 de la jupe axiale 36 puisque la diminution d'épaisseur de matière à cet endroit du couvercle 20 définit une charnière. On limite ainsi les risques de déformation définitive de la jupe axiale 36, ce qui garantit une fixation sûre du couvercle 20 sur le tambour 12, y compris en cas de choc violent.By pressing the cover 20 against the upper axial end of the drum 12, the chamfered outer edge 53 controls the deformation of the axial skirt 36 towards the outside, which allows the passage of the lower end of the axial skirt 36 comprising the second radial surface 44. The deformation of the axial skirt 36 is aided by the presence of the annular groove 56 and the chamfer on the outer edge 52 of the axial skirt 36 since the reduction in material thickness at this point of the cover 20 defines a hinge. This limits the risk of permanent deformation of the axial skirt 36, which ensures a secure attachment of the cover 20 on the drum 12, including in case of violent impact.

Lorsque la seconde surface radiale 44 dépasse axialement la première surface radiale 40 vers le bas, la jupe axiale 36 se rabat vers l'intérieur et se resserre contre le tronçon 38 tronconique du tambour 12. L'extrémité axiale inférieure de la jupe axiale 36 est alors reçue partiellement dans la gorge 46.When the second radial surface 44 protrudes axially from the first radial surface 40 downwards, the axial skirt 36 folds inwards and tightens against the frustoconical section 38 of the drum 12. The lower axial end of the axial skirt 36 is then partially received in the groove 46.

On obtient ainsi un barillet 10 avec un très bon ajustement du couvercle 20 sur le tambour 12, et un maintient du couvercle 20 qui s'exerce sur toute la circonférence du barillet 10.A barrel 10 is thus obtained with a very good adjustment of the lid 20 on the drum 12, and a holding of the lid 20 which is exerted on the entire circumference of the barrel 10.

On note que l'agencement pour le montage du couvercle 20 sur le tambour 12 selon l'invention est particulièrement adapté à un barillet 10 ayant un rapport diamètre sur hauteur élevé car il améliore la fixation du couvercle 20 sans compliquer les opérations de montage et sans pénaliser le volume utilisable à l'intérieur du tambour 12 pour le ressort 14. De plus, l'encombrement extérieur du barillet 10 selon l'invention n'est pas modifié ce qui facilite son agencement dans un mouvement de pièce d'horlogerie telle qu'une montre-bracelet où l'espace disponible est particulièrement limité.Note that the arrangement for mounting the lid 20 on the drum 12 according to the invention is particularly suitable for a barrel 10 having a high diameter to height ratio because it improves the fixing of the lid 20 without complicating assembly operations and without penalize the usable volume inside the drum 12 for the spring 14. In addition, the external size of the barrel 10 according to the invention is not modified which facilitates its arrangement in a timepiece movement such as a wristwatch where the space available is particularly limited.

Claims (12)

  1. Barrel (10) for a timepiece comprising cylindrical drum (12), in which is lodged a barrel spring (14), a barrel shaft (16), on which an end of the barrel spring (14) is attached, and a cover (20) closing the drum (12) at its superior axial end, wherein the cover (20) comprises a main disc-shaped body (34) and an lower peripheral axial skirt (36) driven on an outer axial wall (30) of the drum (12), for retaining the cover (20) on the drum (12), characterized in that the outer axial wall (30) of the drum (12) has a first radial surface (40) that is oriented towards the bottom, in that the inner side (42) of the axial skirt (36) has a second radial surface (44) oriented towards the top, and in that the two radial surfaces (40,44) are provided facing each other so as to axially retain the cover (20) on the drum (12) in case of a schock.
  2. Barrel (10) according to the previous claim, characterized in that the two radial surfaces (40, 44) are annular-shaped.
  3. Barrel (10) according to the any of previous claims, characterized in that second radial surface (44) is formed by a shoulder arranged within the inner side (42) of the skirt (36).
  4. Barrel (10) according to the any of previous claims, characterized in that the first radial surface (40) is formed by a shoulder arranged within the outer axial wall (30) of the drum (12).
  5. Barrel (10) according to the any of previous claims, characterized in the outer axial wall (30) of the drum (12) comprises a annular radial groove (46), which is axially delimited on top by the first radial surface (40) and at the bottom by a third annular radial surface (48) oriented towards the top.
  6. Barrel (10) according to the any of previous claims, characterized in that the axial skirt (36) comprises an inner chamfer (50) at its lower axial end, wherein said chamfer (50) cooperates with the outer edge (53) of the upper axial end of the drum (12) during the mounting of the cover (20) on the drum (12), in order to apply an outer strain to the skirt (36).
  7. Barrel (10) according to the previous claim, characterized in that the outer external edge (53) of the upper axial end of the drum (12) is chamfered, so as to facilitate the outer strain of the skirt (36) during the mounting of the cover (20) on the drum (12).
  8. Barrel (10) according to the any of previous claims, characterized in that the lower side (54) of the main body (34) comprises an annular peripheral groove (56), which is adjacent to the skirt (36), in order to facilitate the outer strain of the skirt (36) during the mounting of the cover (20) on the drum (12).
  9. Barrel (10) according to the previous claim, characterized in that the annular peripheral groove (56) is delimited on the inner side by an axial surface (58) and on the outer side by a truncated conical surface (60), whose diameter decreases towards the bottom.
  10. Barrel (10) according to the any of previous claims, characterized in that the outer edge (52) of the upper axial end of the axial skirt (36) is chamfered, in order to facilitate the outer strain of the skirt (36) during the mounting of the cover (20) on the drum (12).
  11. Barrel (10) according to the any of previous claims, characterized in that the outer axial wall (30) of the drum (12) has tapered part (38) with an increasing diameter towards the top, which has a complementary form compared to tapared part of the inner side (42) of the skirt (36), in order to allow the pressing of the skirt (36) into the drum (12).
  12. Timepiece, characterized in that it comprises a barrel (10) according to one of the preceding claims.
EP06111644A 2006-03-23 2006-03-23 Timepiece and barrel provided with an improved fixation of the barrel cap Active EP1837717B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT06111644T ATE470176T1 (en) 2006-03-23 2006-03-23 CLOCK AND BARREL WITH IMPROVED FIXATION OF THE COVER
EP06111644A EP1837717B1 (en) 2006-03-23 2006-03-23 Timepiece and barrel provided with an improved fixation of the barrel cap
DE602006014650T DE602006014650D1 (en) 2006-03-23 2006-03-23 Watch and barrel with improved fixation of the lid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06111644A EP1837717B1 (en) 2006-03-23 2006-03-23 Timepiece and barrel provided with an improved fixation of the barrel cap

Publications (2)

Publication Number Publication Date
EP1837717A1 EP1837717A1 (en) 2007-09-26
EP1837717B1 true EP1837717B1 (en) 2010-06-02

Family

ID=37565868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06111644A Active EP1837717B1 (en) 2006-03-23 2006-03-23 Timepiece and barrel provided with an improved fixation of the barrel cap

Country Status (3)

Country Link
EP (1) EP1837717B1 (en)
AT (1) ATE470176T1 (en)
DE (1) DE602006014650D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2390732A1 (en) * 2010-05-27 2011-11-30 Association Suisse pour la Recherche Horlogère Barrel spring
US9298162B2 (en) 2010-10-01 2016-03-29 Rolex Sa Timepiece barrel with thin disks
RU2473945C1 (en) * 2011-06-29 2013-01-27 Общество с ограниченной ответственностью "Константин Чайкин" Watch spring drive, watch with said drive, and method of configuring watch with spring drive
WO2018067170A1 (en) * 2016-10-07 2018-04-12 Hewlett-Packard Development Company, L.P. Rack and pinion gear system for a watch

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE137425C (en) *
CH140771A (en) 1929-06-25 1930-06-30 Le Coultre & Cie Barrel.
JPH11174162A (en) * 1997-12-11 1999-07-02 Seiko Instruments Inc Barrel wheel and mechanical time piece

Also Published As

Publication number Publication date
ATE470176T1 (en) 2010-06-15
DE602006014650D1 (en) 2010-07-15
EP1837717A1 (en) 2007-09-26

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