WO2017005394A1 - Watch barrel arbor - Google Patents

Watch barrel arbor Download PDF

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Publication number
WO2017005394A1
WO2017005394A1 PCT/EP2016/060274 EP2016060274W WO2017005394A1 WO 2017005394 A1 WO2017005394 A1 WO 2017005394A1 EP 2016060274 W EP2016060274 W EP 2016060274W WO 2017005394 A1 WO2017005394 A1 WO 2017005394A1
Authority
WO
WIPO (PCT)
Prior art keywords
hook
mainspring
end surface
radius
barrel shaft
Prior art date
Application number
PCT/EP2016/060274
Other languages
French (fr)
Inventor
David Chabloz
Original Assignee
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
Application filed by Patek Philippe Sa Geneve filed Critical Patek Philippe Sa Geneve
Priority to EP16720862.8A priority Critical patent/EP3320402B1/en
Publication of WO2017005394A1 publication Critical patent/WO2017005394A1/en
Priority to HK18107066.4A priority patent/HK1247674B/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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/18—Constructions for connecting the ends of the mainsprings with the barrel or the arbor
    • 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 present invention relates to a watch drum shaft.
  • the barrel is the motor unit that provides the energy needed to move the various components.
  • the barrel comprises a drum, a lid closing the drum, a barrel shaft about which the barrel and the lid rotate freely, and a spiral motor spring housed in the drum.
  • the outer turn of the motor spring is held by the drum wall.
  • the barrel shaft includes a portion called "bung" which carries a hook to which is attached the inner coil of the mainspring.
  • the barrel shaft is integral in rotation with a ratchet and, by means of this ratchet, can be rotated by a winding stem (manual winding) or an oscillating weight (automatic winding) of the movement to arm the barrel. motor spring and thus accumulate energy.
  • the dimensioning of the barrel shaft allows it to withstand the stresses that it undergoes the motor spring during the arming of the latter.
  • such dimensioning limits the volume available inside the drum to accommodate the mainspring. Decreasing the diameter of the barrel shaft would increase the volume of the mainspring, thus the running time of the movement.
  • a simple homothetic reduction of the barrel shaft is not suitable, the mechanical strength of the barrel shaft is then no longer sufficient. This lack of mechanical strength is all the more problematic that, for the same torque of the motor spring, a decrease in the diameter of the barrel shaft causes an increase in the force applied to the hook.
  • the present invention aims to facilitate a reduction in the diameter of the barrel shaft and proposes for this purpose a watch barrel shaft comprising a plug including itself a bearing surface for an inner coil of a mainspring, bearing surface from which protrudes a hook intended to be engaged in an eyelet of said inner coil, the hook being located, in the axial direction of the barrel shaft, between a first portion and a second portion of the bearing surface and comprising an end surface serving as support to the wall of the eyelet during the winding of the mainspring, the bung comprising, upstream of the hook in the winding direction of the mainspring, a recess for receiving the inner end of the mainspring, characterized in that that the wall of the recess comprises an arcuate recess which abuts the said end surface or an extension of the said end surface without forming an edge with the said end surface, respectively with the said extension, in order to reduce the stresses undergone by the hook when winding the mainspring.
  • FIG. 1 is a perspective view of a barrel shaft according to a particular embodiment of the invention.
  • FIG. 2 is a plan view from above of the barrel shaft according to said particular embodiment, which is attached to the inner coil of a motor spring (shown partially);
  • FIG. 3 is a perspective view of a barrel shaft according to another embodiment of the invention.
  • a barrel shaft 1 according to a particular embodiment of the invention comprises two pivots 2, 3 for pivoting in bearings of a clockwork movement about an axis A, a portion of square section 4 on which can be mounted a ratchet, two cylindrical portions 5, 6 for the pivoting, respectively, of a drum and a barrel cover, and a bung 7.
  • the bung 7 carries a hook 8 for fixing the inner coil 9 of a spiral motor spring housed in the drum.
  • the winding direction of the mainspring is represented in FIG. 2 by the arrow S. More particularly, the bung 7 comprises a bearing surface 10 for the mainspring, on which the hook 8 is located.
  • This bearing surface 10 extends, in the winding direction S of the driving spring, of a first bead 1 1 to a second edge 12.
  • the bung 7 also comprises, upstream of the hook 8, a clearance 13 for receiving the inner end 14 of the motor spring, clearance whose wall 15 joins the first and second edges 1 1, 12.
  • the hook 8 is intended to be engaged in an eyelet 16 of the inner coil 9 of the motor spring and is located, in the direction of the axis A, between two parts 10a, 10b of the bearing surface 10 for him. allow to be surrounded all around the wall of the eyelet 16.
  • the hook 8 comprises two opposite end surfaces 17, 18. In the winding direction S, the end surface 18 is located upstream of the end surface 17 and at the level of the first edge 11. This end surface 18, preferably flat, serves to support the wall of the eyelet 16 when the mainspring is armed.
  • the bearing surface 10 is composed of a first portion 19 extending from the first edge 11 and whose radius increases in the winding direction S, and a second portion 20 extending from the first portion 19 to the second edge 12 and whose radius is constant.
  • the bearing surface 10 could, however, have another shape, for example being of increasing radius from the first edge 11 to the second edge 12.
  • the wall 15 of the clearance 13 has itself a curved profile with a hump 21 in its central portion and two recesses 22, 23 in its two end portions.
  • the recess 23 defines with the bearing surface 10 the first edge 1 1 and adjoins the base 24 and the end surface 18 of the hook 8.
  • the wall 15 of the recess 13 could have, between the hollow 23 and the second edge 12, a straight profile.
  • the recess 23 has an arcuate profile of radius R1 and its tangent plane at its line of junction with the end surface 18 of the hook 8 is the plane which contains said end surface 18.
  • the hollow 23 joins the end surface 18 of the hook 8 to the rest of the wall 15 of the clearance 13 without forming of the edge with the end surface 18.
  • the constraints that the base 24 of the hook 8 during the armature of the motor spring is therefore considerably reduced. This makes it possible to reduce the diameter of the barrel shaft 1.
  • no edge is formed between the recess 23 and the second edge 12 in the clearance 13. In this way, the presence of any areas of weakness in the vicinity of the hook 8 is avoided.
  • the radius R1 of the recess 23 is greater than or equal to 0.05 mm, or even 0.09 mm.
  • the radius R1 may however be less than or equal to 0.5 mm.
  • the radius R2 of the plug 7 is less than or equal to 1.15 mm, or even 1 mm, or even 0.85 mm.
  • the radius R2 may however be greater than or equal to 0.75 mm.
  • the radius R2 of the bung 7 is measured at the upstream end of the wall 15 of the clearance 13, that is to say that it is defined as the distance between the upstream end of the wall 15 of the clearance 13 and the axis A of the barrel shaft 1 and that it corresponds to the radius
  • the upstream end of the wall 15 of the clearance 13 coincides with the downstream end of the bearing surface 10. In the example shown, these two ends are the second edge 12.
  • the end surface 18 of the hook 8 may be slightly curved. In this case, not to form an edge between them, the end surface 18 and the recess 23 have their tangent planes at their junction line which are merged.
  • FIG 3 illustrates a barrel shaft V according to another embodiment of the invention.
  • This barrel shaft V differs from the barrel shaft 1 of Figures 1 and 2 by the shape of the clearance 13 'located upstream of the hook 8.
  • the wall 15' of the clearance 13 ' comprises successively between the first edge 1 1 and the second edge 12, a flat surface 22 ', an arcuate recess 23' and an upstream surface 24 'which is flat in the example shown but which could also be curved.
  • the first edge 11 is thus the intersection between the plane surface 22 'and the bearing surface 10.
  • the second edge 12 is the intersection between the upstream surface 24' and the bearing surface 10.
  • the flat surface 22 is in the same plane as the end surface 18 of the hook 8 and thus defines an extension 25 'for the end surface 18.
  • the tangent plane of the recess 23' at its junction line with the flat surface 22 ' is the plane that contains surfaces 18 and 22 '.
  • the hollow 23 ' forms no edge with the flat surface 22'.
  • no edge is formed between the hollow 23 'and the upstream surface 24'.
  • the end surface 18 of the hook 8 and / or the extension 25 ' may be slightly curved (s).
  • extension of a given surface is meant in the present invention a surface that adjoins the given surface without forming an edge with it.
  • the radius of the recess 23 ' can take the same values as those of the radius R1 illustrated in FIG. 2.
  • the radius of the plug 7, measured at the upstream end of the wall 15' of the recess 13 ' can take the same values as the radius R2 shown in Figure 2.
  • the second edge 12 could be removed.
  • the upstream part of the wall 15, 15 'of the clearance 13, 13' and the downstream part of the bearing surface 10 could have their tangent planes at their junction line which are merged.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Springs (AREA)

Abstract

The watch barrel arbor (1) according to the invention comprises a core (7) itself comprising a bearing surface (10) for an interior turn (9) of a mainspring, from which bearing surface (10) there projects a hook (8) intended to engage in an eye (16) of said interior turn (9). The hook (8) is situated, in the axial direction (A) of the barrel arbor (1), between a first part (10a) and a second part (10b) of the bearing surface (10) and comprises an end surface (18) serving to support the wall of the eye (16) when the mainspring is being wound. The core (7) comprises, upstream of the hook (8) in the direction of winding (S) of the mainspring, a cutout (13) intended to accept the interior end (14) of the mainspring. The barrel arbor is characterized in that the wall (15) of the cutout (13) comprises an arc-shaped recess (23) that adjoins the end surface (18) of the hook (8) or a continuation of the end surface (18) of the hook (8) without forming an edge corner with this end surface (18) or, respectively, with this continuation, so as to reduce the stress experienced by the hook (8) when winding the mainspring.

Description

Arbre de barillet d'horlogerie  Clockwork shaft
La présente invention concerne un arbre de barillet d'horlogerie. The present invention relates to a watch drum shaft.
Dans un mouvement horloger mécanique, le barillet est l'organe moteur qui apporte l'énergie nécessaire au déplacement des différents composants. Le barillet comprend un tambour, un couvercle fermant le tambour, un arbre de barillet autour duquel pivotent librement le tambour et le couvercle, et un ressort moteur en spirale logé dans le tambour. La spire extérieure du ressort moteur est maintenue par la paroi du tambour. L'arbre de barillet comprend une partie appelée « bonde » qui porte un crochet auquel est attachée la spire intérieure du ressort moteur. L'arbre de barillet est solidaire en rotation d'un rochet et, par l'intermédiaire de ce rochet, peut être entraîné en rotation par une tige de remontoir (remontage manuel) ou une masse oscillante (remontage automatique) du mouvement pour armer le ressort moteur et accumuler ainsi de l'énergie.  In a mechanical watchmaking movement, the barrel is the motor unit that provides the energy needed to move the various components. The barrel comprises a drum, a lid closing the drum, a barrel shaft about which the barrel and the lid rotate freely, and a spiral motor spring housed in the drum. The outer turn of the motor spring is held by the drum wall. The barrel shaft includes a portion called "bung" which carries a hook to which is attached the inner coil of the mainspring. The barrel shaft is integral in rotation with a ratchet and, by means of this ratchet, can be rotated by a winding stem (manual winding) or an oscillating weight (automatic winding) of the movement to arm the barrel. motor spring and thus accumulate energy.
Dans les mouvements horlogers conventionnels, le dimensionnement de l'arbre de barillet lui permet de supporter les contraintes que lui fait subir le ressort moteur lors de l'armage de ce dernier. Cependant, un tel dimensionnement limite le volume disponible à l'intérieur du tambour pour loger le ressort moteur. Diminuer le diamètre de l'arbre de barillet permettrait d'augmenter le volume du ressort moteur, donc la durée de marche du mouvement. Mais une simple réduction homothétique de l'arbre de barillet ne convient pas, la résistance mécanique de l'arbre de barillet n'étant alors plus suffisante. Ce manque de résistance mécanique est d'autant plus problématique que, pour un même couple du ressort moteur, une diminution du diamètre de l'arbre de barillet entraîne une augmentation de la force appliquée au crochet.  In conventional watchmaking movements, the dimensioning of the barrel shaft allows it to withstand the stresses that it undergoes the motor spring during the arming of the latter. However, such dimensioning limits the volume available inside the drum to accommodate the mainspring. Decreasing the diameter of the barrel shaft would increase the volume of the mainspring, thus the running time of the movement. But a simple homothetic reduction of the barrel shaft is not suitable, the mechanical strength of the barrel shaft is then no longer sufficient. This lack of mechanical strength is all the more problematic that, for the same torque of the motor spring, a decrease in the diameter of the barrel shaft causes an increase in the force applied to the hook.
La présente invention vise à faciliter une réduction du diamètre de l'arbre de barillet et propose à cette fin un arbre de barillet d'horlogerie comprenant une bonde comprenant elle-même une surface d'appui pour une spire intérieure d'un ressort moteur, surface d'appui de laquelle fait saillie un crochet destiné à être engagé dans un œillet de ladite spire intérieure, le crochet étant situé, dans la direction axiale de l'arbre de barillet, entre une première partie et une deuxième partie de la surface d'appui et comprenant une surface d'extrémité servant d'appui à la paroi de l'œillet lors de l'armage du ressort moteur, la bonde comprenant, en amont du crochet dans le sens d'enroulement du ressort moteur, un dégagement destiné à recevoir l'extrémité intérieure du ressort moteur, caractérisé en ce que la paroi du dégagement comprend un creux en arc de cercle qui jouxte ladite surface d'extrémité ou un prolongement de ladite surface d'extrémité sans former d'arête avec ladite surface d'extrémité, respectivement avec ledit prolongement, pour diminuer les contraintes subies par le crochet lors de l'armage du ressort moteur. The present invention aims to facilitate a reduction in the diameter of the barrel shaft and proposes for this purpose a watch barrel shaft comprising a plug including itself a bearing surface for an inner coil of a mainspring, bearing surface from which protrudes a hook intended to be engaged in an eyelet of said inner coil, the hook being located, in the axial direction of the barrel shaft, between a first portion and a second portion of the bearing surface and comprising an end surface serving as support to the wall of the eyelet during the winding of the mainspring, the bung comprising, upstream of the hook in the winding direction of the mainspring, a recess for receiving the inner end of the mainspring, characterized in that that the wall of the recess comprises an arcuate recess which abuts the said end surface or an extension of the said end surface without forming an edge with the said end surface, respectively with the said extension, in order to reduce the stresses undergone by the hook when winding the mainspring.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée suivante faite en référence aux dessins annexés dans lesquels :  Other features and advantages of the present invention will appear on reading the following detailed description given with reference to the accompanying drawings in which:
- la figure 1 est une vue en perspective d'un arbre de barillet selon un mode de réalisation particulier de l'invention ;  - Figure 1 is a perspective view of a barrel shaft according to a particular embodiment of the invention;
- la figure 2 est une vue plane de dessus de l'arbre de barillet selon ledit mode de réalisation particulier, auquel est attachée la spire intérieure d'un ressort moteur (montrée partiellement) ;  - Figure 2 is a plan view from above of the barrel shaft according to said particular embodiment, which is attached to the inner coil of a motor spring (shown partially);
- la figure 3 est une vue en perspective d'un arbre de barillet selon un autre mode de réalisation de l'invention.  - Figure 3 is a perspective view of a barrel shaft according to another embodiment of the invention.
En référence aux figures 1 et 2, un arbre de barillet 1 selon un mode de réalisation particulier de l'invention comprend deux pivots 2, 3 pour son pivotement dans des paliers d'un mouvement horloger autour d'un axe A, une portion de section carrée 4 sur laquelle peut être monté un rochet, deux portions cylindriques 5, 6 pour le pivotement, respectivement, d'un tambour et d'un couvercle de barillet, et une bonde 7. La bonde 7 porte un crochet 8 pour la fixation de la spire intérieure 9 d'un ressort moteur en spirale logé dans le tambour. Le sens d'enroulement du ressort moteur est représenté à la figure 2 par la flèche S. Plus particulièrement, la bonde 7 comprend une surface d'appui 10 pour le ressort moteur, sur laquelle est situé le crochet 8. Cette surface d'appui 10 s'étend, dans le sens d'enroulement S du ressort moteur, d'une première arête 1 1 à une seconde arête 12. La bonde 7 comprend aussi, en amont du crochet 8, un dégagement 13 pour recevoir l'extrémité intérieure 14 du ressort moteur, dégagement dont la paroi 15 joint les première et seconde arêtes 1 1 , 12. Le crochet 8 est destiné à être engagé dans un œillet 16 de la spire intérieure 9 du ressort moteur et est situé, dans la direction de l'axe A, entre deux parties 10a, 10b de la surface d'appui 10 pour lui permettre d'être entouré sur tout son pourtour par la paroi de l'œillet 16. Le crochet 8 comprend deux surfaces d'extrémité opposées 17, 18. Dans le sens d'enroulement S, la surface d'extrémité 18 est située en amont de la surface d'extrémité 17 et au niveau de la première arête 1 1 . Cette surface d'extrémité 18, de préférence plane, sert d'appui à la paroi de l'œillet 16 lorsque le ressort moteur est armé. Referring to Figures 1 and 2, a barrel shaft 1 according to a particular embodiment of the invention comprises two pivots 2, 3 for pivoting in bearings of a clockwork movement about an axis A, a portion of square section 4 on which can be mounted a ratchet, two cylindrical portions 5, 6 for the pivoting, respectively, of a drum and a barrel cover, and a bung 7. The bung 7 carries a hook 8 for fixing the inner coil 9 of a spiral motor spring housed in the drum. The winding direction of the mainspring is represented in FIG. 2 by the arrow S. More particularly, the bung 7 comprises a bearing surface 10 for the mainspring, on which the hook 8 is located. This bearing surface 10 extends, in the winding direction S of the driving spring, of a first bead 1 1 to a second edge 12. The bung 7 also comprises, upstream of the hook 8, a clearance 13 for receiving the inner end 14 of the motor spring, clearance whose wall 15 joins the first and second edges 1 1, 12. The hook 8 is intended to be engaged in an eyelet 16 of the inner coil 9 of the motor spring and is located, in the direction of the axis A, between two parts 10a, 10b of the bearing surface 10 for him. allow to be surrounded all around the wall of the eyelet 16. The hook 8 comprises two opposite end surfaces 17, 18. In the winding direction S, the end surface 18 is located upstream of the end surface 17 and at the level of the first edge 11. This end surface 18, preferably flat, serves to support the wall of the eyelet 16 when the mainspring is armed.
Dans l'exemple illustré, la surface d'appui 10 est composée d'une première partie 19 s'étendant depuis la première arête 1 1 et dont le rayon croît dans le sens d'enroulement S, et d'une deuxième partie 20 s'étendant de la première partie 19 à la seconde arête 12 et dont le rayon est constant. La surface d'appui 10 pourrait toutefois avoir une autre forme, par exemple être de rayon croissant de la première arête 1 1 à la seconde arête 12. La paroi 15 du dégagement 13 a, elle, un profil courbe avec une bosse 21 dans sa partie centrale et deux creux 22, 23 dans ses deux parties d'extrémité. En particulier, le creux 23 définit avec la surface d'appui 10 la première arête 1 1 et jouxte la base 24 et la surface d'extrémité 18 du crochet 8. Dans une variante, la paroi 15 du dégagement 13 pourrait avoir, entre le creux 23 et la seconde arête 12, un profil droit.  In the illustrated example, the bearing surface 10 is composed of a first portion 19 extending from the first edge 11 and whose radius increases in the winding direction S, and a second portion 20 extending from the first portion 19 to the second edge 12 and whose radius is constant. The bearing surface 10 could, however, have another shape, for example being of increasing radius from the first edge 11 to the second edge 12. The wall 15 of the clearance 13 has itself a curved profile with a hump 21 in its central portion and two recesses 22, 23 in its two end portions. In particular, the recess 23 defines with the bearing surface 10 the first edge 1 1 and adjoins the base 24 and the end surface 18 of the hook 8. In a variant, the wall 15 of the recess 13 could have, between the hollow 23 and the second edge 12, a straight profile.
Le creux 23 a un profil en arc de cercle de rayon R1 et son plan tangent au niveau de sa ligne de jonction avec la surface d'extrémité 18 du crochet 8 est le plan qui contient ladite surface d'extrémité 18. Ainsi, le creux 23 joint la surface d'extrémité 18 du crochet 8 au reste de la paroi 15 du dégagement 13 sans former d'arête avec la surface d'extrémité 18. Les contraintes que subit la base 24 du crochet 8 lors de l'armage du ressort moteur sont donc considérablement réduites. Ceci rend possible une diminution du diamètre de l'arbre de barillet 1 . The recess 23 has an arcuate profile of radius R1 and its tangent plane at its line of junction with the end surface 18 of the hook 8 is the plane which contains said end surface 18. Thus, the hollow 23 joins the end surface 18 of the hook 8 to the rest of the wall 15 of the clearance 13 without forming of the edge with the end surface 18. The constraints that the base 24 of the hook 8 during the armature of the motor spring is therefore considerably reduced. This makes it possible to reduce the diameter of the barrel shaft 1.
En effet, sur les arbres de barillet conventionnels (sans le creux 23) la surface d'extrémité du crochet servant d'appui forme une arête avec la paroi du dégagement. Il a été constaté lors d'essais et de simulations que cette arête constitue une zone de faiblesse, ou zone de concentration de contraintes, qui empêche une diminution du diamètre de l'arbre de barillet. Par exemple, des essais ont été effectués par la demanderesse sur des arbres de barillet conventionnels dont le diamètre de la bonde avait été réduit de 2,35 mm à 1 ,60 mm, permettant un allongement du ressort moteur de 10,4 tours à 1 1 ,8 tours. Le couple appliqué était équivalent à dix fois le couple maximum du ressort moteur. Lors de ces essais, le crochet a été arraché après 30 cycles de remontage du ressort moteur, alors que dans les conditions sus-indiquées il est d'usage de garantir la tenue de l'arbre de barillet pendant 500 cycles. Les mêmes essais effectués sur l'arbre de barillet selon l'invention, muni du creux 23, ont permis de vérifier qu'il supporte les 500 cycles de remontage, voire plus de 1000 cycles, sans rupture du crochet.  Indeed, on the conventional barrel shafts (without the recess 23) the end surface of the hook acting as a support forms an edge with the wall of the recess. It has been found during tests and simulations that this edge constitutes a zone of weakness, or stress concentration zone, which prevents a decrease in the diameter of the barrel shaft. For example, tests have been carried out by the Applicant on conventional barrel shafts whose bung diameter has been reduced from 2.35 mm to 1.60 mm, allowing an extension of the mainspring of 10.4 turns to 1 1, 8 rounds. The applied torque was equivalent to ten times the maximum torque of the mainspring. During these tests, the hook was torn off after 30 cycles of winding of the mainspring, whereas under the above-mentioned conditions it is customary to guarantee the holding of the barrel shaft for 500 cycles. The same tests carried out on the barrel shaft according to the invention, provided with the recess 23, made it possible to verify that it supports the 500 cycles of reassembly, or even more than 1000 cycles, without breaking the hook.
De préférence, comme représenté, aucune arête n'est formée entre le creux 23 et la seconde arête 12 dans le dégagement 13. De cette manière, on évite la présence d'éventuelles zones de faiblesse à proximité du crochet 8.  Preferably, as shown, no edge is formed between the recess 23 and the second edge 12 in the clearance 13. In this way, the presence of any areas of weakness in the vicinity of the hook 8 is avoided.
De préférence, le rayon R1 du creux 23 est supérieur ou égal à 0,05 mm, voire à 0,09 mm. Le rayon R1 peut toutefois être inférieur ou égal à 0,5 mm.  Preferably, the radius R1 of the recess 23 is greater than or equal to 0.05 mm, or even 0.09 mm. The radius R1 may however be less than or equal to 0.5 mm.
De préférence également, le rayon R2 de la bonde 7 est inférieur ou égal à 1 ,15 mm, voire à 1 mm, voire à 0,85 mm. Le rayon R2 peut toutefois être supérieur ou égal à 0,75 mm. Dans la présente invention, le rayon R2 de la bonde 7 est mesuré à l'extrémité amont de la paroi 15 du dégagement 13, c'est-à-dire qu'il est défini comme la distance entre l'extrémité amont de la paroi 15 du dégagement 13 et l'axe A de l'arbre de barillet 1 et qu'il correspond au rayon maximum de la bonde 7. L'extrémité amont de la paroi 15 du dégagement 13 coïncide avec l'extrémité aval de la surface d'appui 10. Dans l'exemple illustré, ces deux extrémités sont la seconde arête 12. Also preferably, the radius R2 of the plug 7 is less than or equal to 1.15 mm, or even 1 mm, or even 0.85 mm. The radius R2 may however be greater than or equal to 0.75 mm. In the present invention, the radius R2 of the bung 7 is measured at the upstream end of the wall 15 of the clearance 13, that is to say that it is defined as the distance between the upstream end of the wall 15 of the clearance 13 and the axis A of the barrel shaft 1 and that it corresponds to the radius The upstream end of the wall 15 of the clearance 13 coincides with the downstream end of the bearing surface 10. In the example shown, these two ends are the second edge 12.
Au lieu d'être plane, comme représenté, la surface d'extrémité 18 du crochet 8 peut être légèrement courbe. Dans ce cas, pour ne pas former d'arête entre elles, la surface d'extrémité 18 et le creux 23 ont leurs plans tangents au niveau de leur ligne de jonction qui sont confondus.  Instead of being flat, as shown, the end surface 18 of the hook 8 may be slightly curved. In this case, not to form an edge between them, the end surface 18 and the recess 23 have their tangent planes at their junction line which are merged.
La figure 3 illustre un arbre de barillet V selon un autre mode de réalisation de l'invention. Cet arbre de barillet V diffère de l'arbre de barillet 1 des figures 1 et 2 par la forme du dégagement 13' situé en amont du crochet 8. La paroi 15' du dégagement 13' comprend successivement, entre la première arête 1 1 et la seconde arête 12, une surface plane 22', un creux en arc de cercle 23' et une surface amont 24' qui est plane dans l'exemple représenté mais qui pourrait aussi être courbe. La première arête 1 1 est ainsi l'intersection entre la surface plane 22' et la surface d'appui 10. La seconde arête 12 est l'intersection entre la surface amont 24' et la surface d'appui 10. La surface plane 22' est dans le même plan que la surface d'extrémité 18 du crochet 8 et définit ainsi un prolongement 25' pour la surface d'extrémité 18. Le plan tangent du creux 23' à sa ligne de jonction avec la surface plane 22' est le plan qui contient les surfaces 18 et 22'. Ainsi, le creux 23' ne forme aucune arête avec la surface plane 22'. De même, aucune arête n'est formée entre le creux 23' et la surface amont 24'.  Figure 3 illustrates a barrel shaft V according to another embodiment of the invention. This barrel shaft V differs from the barrel shaft 1 of Figures 1 and 2 by the shape of the clearance 13 'located upstream of the hook 8. The wall 15' of the clearance 13 'comprises successively between the first edge 1 1 and the second edge 12, a flat surface 22 ', an arcuate recess 23' and an upstream surface 24 'which is flat in the example shown but which could also be curved. The first edge 11 is thus the intersection between the plane surface 22 'and the bearing surface 10. The second edge 12 is the intersection between the upstream surface 24' and the bearing surface 10. The flat surface 22 is in the same plane as the end surface 18 of the hook 8 and thus defines an extension 25 'for the end surface 18. The tangent plane of the recess 23' at its junction line with the flat surface 22 'is the plane that contains surfaces 18 and 22 '. Thus, the hollow 23 'forms no edge with the flat surface 22'. Likewise, no edge is formed between the hollow 23 'and the upstream surface 24'.
La surface d'extrémité 18 du crochet 8 et/ou le prolongement 25' pourrai(en)t être légèrement courbe(s). Par « prolongement » d'une surface donnée on entend dans la présente invention une surface qui jouxte la surface donnée sans former d'arête avec elle.  The end surface 18 of the hook 8 and / or the extension 25 'may be slightly curved (s). By "extension" of a given surface is meant in the present invention a surface that adjoins the given surface without forming an edge with it.
Le rayon du creux 23' peut prendre les mêmes valeurs que celles du rayon R1 illustré à la figure 2. De façon analogue, le rayon de la bonde 7, mesuré à l'extrémité amont de la paroi 15' du dégagement 13', peut prendre les mêmes valeurs que le rayon R2 illustré à la figure 2. Dans chacun des modes de réalisation ci-dessus, la seconde arête 12 pourrait être supprimée. En d'autres termes, la partie amont de la paroi 15, 15' du dégagement 13, 13' et la partie aval de la surface d'appui 10 pourraient avoir leurs plans tangents au niveau de leur ligne de jonction qui sont confondus. The radius of the recess 23 'can take the same values as those of the radius R1 illustrated in FIG. 2. Similarly, the radius of the plug 7, measured at the upstream end of the wall 15' of the recess 13 ', can take the same values as the radius R2 shown in Figure 2. In each of the above embodiments, the second edge 12 could be removed. In other words, the upstream part of the wall 15, 15 'of the clearance 13, 13' and the downstream part of the bearing surface 10 could have their tangent planes at their junction line which are merged.

Claims

REVENDICATIONS
1 . Arbre de barillet d'horlogerie (1 ) comprenant une bonde (7) comprenant elle-même une surface d'appui (10) pour une spire intérieure (9) d'un ressort moteur, surface d'appui (10) de laquelle fait saillie un crochet (8) destiné à être engagé dans un œillet (16) de ladite spire intérieure (9), le crochet (8) étant situé, dans la direction axiale (A) de l'arbre de barillet (1 ), entre une première partie (10a) et une deuxième partie (10b) de la surface d'appui (10) et comprenant une surface d'extrémité (18) servant d'appui à la paroi de l'œillet (16) lors de l'armage du ressort moteur, la bonde (7) comprenant, en amont du crochet (8) dans le sens d'enroulement (S) du ressort moteur, un dégagement (13 ; 13') destiné à recevoir l'extrémité intérieure (14) du ressort moteur, caractérisé en ce que la paroi (15 ; 15') du dégagement (13 ; 13') comprend un creux en arc de cercle (23 ; 23') qui jouxte ladite surface d'extrémité (18) ou un prolongement (25') de ladite surface d'extrémité (18) sans former d'arête avec ladite surface d'extrémité (18), respectivement avec ledit prolongement (25'), pour diminuer les contraintes subies par le crochet (8) lors de l'armage du ressort moteur. 1. Watch-dog shaft (1) comprising a bung (7) itself comprising a bearing surface (10) for an inner turn (9) of a motor spring, bearing surface (10) of which protruding a hook (8) intended to be engaged in an eyelet (16) of said inner coil (9), the hook (8) being located, in the axial direction (A) of the barrel shaft (1), between a first portion (10a) and a second portion (10b) of the bearing surface (10) and having an end surface (18) for supporting the wall of the eyelet (16) on the winding of the mainspring, the plug (7) comprising, upstream of the hook (8) in the winding direction (S) of the mainspring, a recess (13; 13 ') intended to receive the inner end (14) of the mainspring, characterized in that the wall (15; 15 ') of the recess (13; 13') comprises an arcuate recess (23; 23 ') adjoining the said end surface (18) or an extension (25 ') of said su end surface (18) without forming an edge with said end surface (18), respectively with said extension (25 '), to reduce the stresses on the hook (8) during the winding of the mainspring .
2. Arbre de barillet selon la revendication 1 , caractérisé en ce que la paroi (15 ; 15') du dégagement (13 ; 13') est sans arête entre son extrémité amont (12) et le creux en arc de cercle (23 ; 23'). 2. Barrel shaft according to claim 1, characterized in that the wall (15; 15 ') of the recess (13; 13') is without a ridge between its upstream end (12) and the arcuate recess (23; 23 ').
3. Arbre de barillet selon la revendication 1 ou 2, caractérisé en ce que ladite surface d'extrémité (18) est plane. 3. Barrel shaft according to claim 1 or 2, characterized in that said end surface (18) is flat.
4. Arbre de barillet selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le rayon (R1 ) du creux en arc de cercle (23 ; 23') est supérieur ou égal à 0,05 mm. Barrel shaft according to one of Claims 1 to 3, characterized in that the radius (R1) of the arcuate recess (23; 23 ') is greater than or equal to 0.05 mm.
5. Arbre de barillet selon la revendication 4, caractérisé en ce que le rayon (R1 ) du creux en arc de cercle (23 ; 23') est supérieur ou égal à 0,09 mm. 5. Shaft arbor according to claim 4, characterized in that the radius (R1) of the arcuate recess (23; 23 ') is greater than or equal to 0.09 mm.
6. Arbre de barillet selon la revendication 4 ou 5, caractérisé en ce que le rayon (R1 ) du creux en arc de cercle (23 ; 23') est inférieur ou égal à 0,5 mm. Barrel shaft according to Claim 4 or 5, characterized in that the radius (R1) of the arcuate recess (23; 23 ') is less than or equal to 0.5 mm.
7. Arbre de barillet selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le rayon (R2) de la bonde (7) tel que mesuré à l'extrémité amont (12) de la paroi (15 ; 15') du dégagement (13 ; 13') est inférieur ou égal à 1 ,15 mm. Barrel shaft according to one of Claims 1 to 6, characterized in that the radius (R2) of the plug (7) as measured at the upstream end (12) of the wall (15; ) of the clearance (13; 13 ') is less than or equal to 1.15 mm.
8. Arbre de barillet selon la revendication 7, caractérisé en ce que le rayon (R2) de la bonde (7) est inférieur ou égal à 1 mm. Barrel shaft according to Claim 7, characterized in that the radius (R2) of the plug (7) is less than or equal to 1 mm.
9. Arbre de barillet selon la revendication 8, caractérisé en ce que le rayon (R2) de la bonde (7) est inférieur ou égal à 0,85 mm. 9. Drum shaft according to claim 8, characterized in that the radius (R2) of the plug (7) is less than or equal to 0.85 mm.
10. Arbre de barillet selon l'une quelconque des revendications 7 à 9, caractérisé en ce que le rayon (R2) de la bonde (7) est supérieur ou égal à 0,75 mm. 10. A barrel shaft according to any one of claims 7 to 9, characterized in that the radius (R2) of the plug (7) is greater than or equal to 0.75 mm.
PCT/EP2016/060274 2015-07-07 2016-05-09 Watch barrel arbor WO2017005394A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16720862.8A EP3320402B1 (en) 2015-07-07 2016-05-09 Timepiece arbor
HK18107066.4A HK1247674B (en) 2015-07-07 2018-05-30 Timepiece arbor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15175608 2015-07-07
EP15175608.7 2015-07-07

Publications (1)

Publication Number Publication Date
WO2017005394A1 true WO2017005394A1 (en) 2017-01-12

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PCT/EP2016/060274 WO2017005394A1 (en) 2015-07-07 2016-05-09 Watch barrel arbor

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EP (1) EP3320402B1 (en)
HK (1) HK1247674B (en)
WO (1) WO2017005394A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019207490A1 (en) 2018-04-26 2019-10-31 Patek Philippe Sa Geneve Timepiece barrel and method for modifying a timepiece movement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103376727A (en) * 2012-04-25 2013-10-30 Eta瑞士钟表制造股份有限公司 Barrel spring and arbour
WO2013189856A2 (en) * 2012-06-22 2013-12-27 Cartier Création Studio Sa Drive member for clock movement
EP2703908A1 (en) * 2012-08-30 2014-03-05 ETA SA Manufacture Horlogère Suisse Timepiece arbor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103376727A (en) * 2012-04-25 2013-10-30 Eta瑞士钟表制造股份有限公司 Barrel spring and arbour
WO2013189856A2 (en) * 2012-06-22 2013-12-27 Cartier Création Studio Sa Drive member for clock movement
EP2703908A1 (en) * 2012-08-30 2014-03-05 ETA SA Manufacture Horlogère Suisse Timepiece arbor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019207490A1 (en) 2018-04-26 2019-10-31 Patek Philippe Sa Geneve Timepiece barrel and method for modifying a timepiece movement

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HK1247674B (en) 2020-04-03
EP3320402B1 (en) 2019-07-24

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