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EP3321749B1 - Seal for timepieces - Google Patents

Seal for timepieces Download PDF

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Publication number
EP3321749B1
EP3321749B1 EP16198214.5A EP16198214A EP3321749B1 EP 3321749 B1 EP3321749 B1 EP 3321749B1 EP 16198214 A EP16198214 A EP 16198214A EP 3321749 B1 EP3321749 B1 EP 3321749B1
Authority
EP
European Patent Office
Prior art keywords
tube
sealing joint
internal
lobe
seal
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
EP16198214.5A
Other languages
German (de)
French (fr)
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EP3321749A1 (en
Inventor
Hervé Bouclier
Jean-Pierre Peray
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
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 EP16198214.5A priority Critical patent/EP3321749B1/en
Publication of EP3321749A1 publication Critical patent/EP3321749A1/en
Application granted granted Critical
Publication of EP3321749B1 publication Critical patent/EP3321749B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/10—Hermetic sealing of openings, joints, passages or slits of winding stems
    • G04B37/103—Hermetic sealing of openings, joints, passages or slits of winding stems by screwing the crown onto the case

Definitions

  • the present invention relates to a seal for the watch industry, in particular a seal for a screwed crown.
  • gaskets are used between the different parts of the watch case (ice, bezel, middle part, bottom), in the winding and setting crowns and in the push buttons. It is important to protect the watch movement in the box from dust, water or any other liquid.
  • the present invention aims to at least partially overcome these disadvantages and proposes for this purpose a seal for the watch industry comprising an inner surface and an outer surface surrounding a common axis, a first of the inner and outer surfaces comprising first and second lobes surrounding said axis at respective different axial positions, characterized in that a second of the inner and outer surfaces is asymmetrical with respect to the first of the inner and outer surfaces. and comprises, at an axial position between the respective axial positions of the first and second lobes, a third lobe surrounding said axis.
  • the ring is of the screw type, that is to say it comprises a thread that can cooperate with a thread of the tube to allow screwing of the ring on the tube.
  • a seal 1 for the watchmaking has an axis of symmetry A and extends in the direction of the axis A between a first end 2 and a second end 3.
  • the term “axial” will refer to the direction of the axis A and the term “radial” to the directions perpendicular to the axis A.
  • the seal 1 comprises a portion of generally annular shape 4 terminated, at the first end 2, by a shoulder 5.
  • the generally annular portion 4 comprises an inner surface 6 and an outer surface 7.
  • the inner and outer surfaces 6, 7 are asymmetrical with respect to each other.
  • the inner surface 6 defines successively, in the direction from the first end 2 to the second end 3, a first lobe 8, a cylindrical portion 9 and a second lobe 10.
  • lobe is meant a protrusion with a rounded axial section or , more generally, a projection of which at least the end has a rounded axial section.
  • the lobes 8, 10 and the cylindrical portion 9 each surround the axis A.
  • the outer surface 7 defines successively, in the direction from the first end 2 to the second end 3, a cylindrical portion 11, a lobe 12 and a portion frustoconical 13 whose large radius adjoins the lobe 12 and the small radius corresponds to the second end 3.
  • the lobe 12 faces the cylindrical portion 9 while the lobes 8, 10 face respectively the cylindrical portion 11 and the frustoconical portion 13.
  • the axial position of the lobe 12 is located between the respective axial positions of the lobes 8 , And is preferably centered with respect to said respective axial positions, as illustrated.
  • the axial position of each of the lobes 8, 10, 12 is defined as the axial position of its vertex, that is to say of the circular line where the lobe is tangential to a cylinder of axis A .
  • the shoulder 5 defines a flat bearing surface 14 orthogonal to the axis A and a surface 15 opposite to the bearing surface 14. This surface 15 defines a lobe 16 which surrounds the axis A. Unlike the lobes 8 , 10, 12, oriented radially, the lobe 16 is oriented axially.
  • the seal 1 can thus provide a tight seal by being compressed radially in specific areas (lobes 8, 10, 12) and axially compressed in another well-defined area (lobe 16).
  • the lobe 8 is close to the first end 2, more precisely the geometric plane defined by the bearing surface 14 intersects the lobe 8.
  • the seal 1 may have a greater number of lobes than the four lobes 8, 10, 12, 16 described and illustrated.
  • the seal 1 with its generally annular shape portion 4 and its shoulder 5 forms a single piece, typically consisting of an elastomer such as a nitrile.
  • the seal 1 is preferably monolithic (in a single material) typically obtained by molding, but it can also be a composite part (made of several materials) obtained for example by bonding several parts or by a process forming an intimate bond (for example two-component molding) between several parts.
  • a timepiece typically a wristwatch
  • a control device 19 protrudes on one side of the box 17, in a conventional manner per se, to allow the setting at the time and the reassembly of the movement 18.
  • the control device 19 is of the type with screwed crown. It comprises a fixed tube 20, for example screwed or driven, in a hole through the wall of the box 17 and a ring 21.
  • the ring 21 is formed of two coaxial parts, namely a cap 22 and a fixed central sleeve 23, for example, screwed into the bottom of the cap 22.
  • the cap 22 and the sleeve 23 could be in one piece.
  • the sleeve 23 is engaged in the tube 20 in a mobile manner in translation and in rotation and receives a piston 24 and a spring 25.
  • the spring 25 is housed between the bottom of the cap 22 and a shoulder of the piston 24.
  • the piston 24 is coupled to a winding and setting rod 26 of the movement 18.
  • the sleeve 23 is connected to the piston 24 in a manner known per se to be able to move freely in rotation and in translation relative to the piston 24 during the screwing and unscrewing of the ring 21, and to be secured to the piston 24, and therefore to the winding and setting rod 26, in rotation in the unscrewed or pulled position of the ring 21 and in translation between the unscrewed and pulled positions of the ring 21.
  • the seal 1 is placed in a housing formed between the tube 20 and the ring 21. More specifically, the generally annular portion 4 is located in an annular housing 30 defined by the tube 20 and the sleeve 23, and the shoulder 5 rests by its bearing surface 14 on the end of the tube 20, between the tube 20 and the cap 22. At the figure 2 the seal 1 is shown in its undeformed state of repose. In practice it is of course constrained because of the dimensions of the housing 30 smaller than certain dimensions of the seal 1. In particular, the lobes 8, 10, 12, 16 are compressed and define specific areas of sealing. By their radial compression between the tube 20 and the ring 21 the lobes 8, 10, 12 provide a seal in all positions axial axial of the ring 21.
  • the lobe 16 By its axial compression between the tube 20 and the ring 21 the lobe 16 provides a seal only in the screwed position of the ring 21, but this seal is much stronger than that at the lobes 8, 10 12. Indeed, the displacement of the cap 22 which compresses the lobe 16 and the shoulder 5 is in the direction of the thickness of the latter while the displacement of the sleeve 23 which compresses the lobes 8, 10, 12 and the generally annular shape portion 4 is tangential to these.
  • the screwed position of the crown 21 is its normal position when the watch is worn. In this position, the bottom of the cap 22 is preferably in abutment against an abutment surface 31 of the tube 20.
  • the shape of the seal 1 gives it great flexibility and thus improves the seal. Indeed, during assembly, as soon as a lobe 8, 10, 12 is compressed, the material of the seal 1 can leak towards the opposite side to the lobe by filling the empty space that existed between this opposite side and the tube 20 or sleeve 23.
  • the frustoconical portion 13 of the outer surface 7 makes it possible to better adapt the seal 1 to the annular shape of the housing 30. As a variant, however, this frustoconical portion 13 could be replaced by a cylindrical portion.
  • a recess 32 formed on the inner surface of the tube 20 cooperates with the lobe 12 to retain the seal 1 in the housing 30 when the ring 21 is unscrewed and when pulled from its unscrewed position.
  • the generally annular portion 4 of the gasket 1 is placed between the skirt 27 of the cap 22 and the tube 20.
  • the shoulder 5 still rests on the end of the tube 20 but is oriented inwards (towards the axis A) rather than outwards.
  • the threads 28, 29 for screwing the ring 21 onto the tube 20 are located respectively on the inner surface of the tube 20 and the outer surface of the sleeve 23.
  • the inner and outer surfaces 6, 7 of the generally shaped part. annular are reversed, that is to say that the outer surface 7 comprises the lobes 8, 10 and the cylindrical portion 9 and the inner surface 6 comprises the lobe 12, the cylindrical portion 11 and the frustoconical portion 13.
  • the seal 1 according to the invention can be used in other applications than a screwed crown, for example a conventional non-screwed crown or a pusher. In such applications, the shoulder 5 can be removed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)

Description

La présente invention concerne un joint d'étanchéité pour l'horlogerie, en particulier un joint d'étanchéité pour une couronne vissée.The present invention relates to a seal for the watch industry, in particular a seal for a screwed crown.

En horlogerie on utilise des joints d'étanchéité entre les différentes parties de la boîte de montre (glace, lunette, carrure, fond), dans les couronnes de remontage et de mise à l'heure et dans les boutons poussoirs. Il est important en effet de protéger le mouvement horloger situé dans la boîte de la poussière, de l'eau ou de tout autre liquide.In watchmaking, gaskets are used between the different parts of the watch case (ice, bezel, middle part, bottom), in the winding and setting crowns and in the push buttons. It is important to protect the watch movement in the box from dust, water or any other liquid.

Pour rendre étanche l'assemblage de deux composants on a généralement recours à des joints plats ou toriques. Dans certains cas, un seul joint est suffisant. Dans d'autres cas, plusieurs joints sont employés pour augmenter l'étanchéité. Ces joints sont alors placés soit dans un logement commun où ils sont séparés par des rondelles soit dans des logements distincts. Mettre en place les joints dans leur(s) logement(s) est parfois difficile compte tenu de la faible accessibilité de ce(s) dernier(s). Pour faciliter cette opération la demande de brevet suisse CH 708126 propose, dans le cadre d'un poussoir, et de manière large dans le cadre d'une couronne, de remplacer les joints et rondelles par un joint monobloc remplissant les mêmes fonctions. Un inconvénient d'un tel joint monobloc est qu'il manque de souplesse, ce qui peut nuire à l'étanchéité. Un autre inconvénient est son grand encombrement, peu compatible avec un usage dans des couronnes et notamment des couronnes vissées. La demande de brevet française FR 2786574 divulgue un joint d'étanchéité asymétrique comportant deux lobes entourant une saillie annulaire.To seal the assembly of two components is usually used flat or toric joints. In some cases, a single seal is sufficient. In other cases, several seals are used to increase the seal. These joints are then placed either in a common housing where they are separated by washers or in separate dwellings. Putting joints in their housing (s) is sometimes difficult given the low accessibility of this (s) last (s). To facilitate this operation the Swiss patent application CH 708126 proposes, in the context of a pusher, and broadly in the context of a ring, to replace the seals and washers by a monobloc seal performing the same functions. A disadvantage of such a monobloc seal is that it lacks flexibility, which can affect the seal. Another disadvantage is its large size, not very compatible with use in crowns and in particular screwed crowns. The French patent application FR 2786574 discloses an asymmetric seal having two lobes surrounding an annular projection.

La présente invention vise à remédier en partie au moins à ces inconvénients et propose à cette fin un joint d'étanchéité pour l'horlogerie comprenant une surface intérieure et une surface extérieure entourant un axe commun, une première des surfaces intérieure et extérieure comprenant des premier et deuxième lobes entourant ledit axe à des positions axiales respectives différentes, caractérisé en ce qu'une deuxième des surfaces intérieure et extérieure est asymétrique par rapport à la première des surfaces intérieure et extérieure et comprend, à une position axiale située entre les positions axiales respectives des premier et deuxième lobes, un troisième lobe entourant ledit axe.The present invention aims to at least partially overcome these disadvantages and proposes for this purpose a seal for the watch industry comprising an inner surface and an outer surface surrounding a common axis, a first of the inner and outer surfaces comprising first and second lobes surrounding said axis at respective different axial positions, characterized in that a second of the inner and outer surfaces is asymmetrical with respect to the first of the inner and outer surfaces. and comprises, at an axial position between the respective axial positions of the first and second lobes, a third lobe surrounding said axis.

La présente invention propose également une pièce d'horlogerie comprenant un tel joint d'étanchéité, en particulier une pièce d'horlogerie comprenant :

  • un mouvement,
  • une boîte renfermant le mouvement,
  • un tube faisant saillie sur la boîte,
  • une couronne comprenant une coiffe et une partie centrale engagée dans le tube et accouplée à une tige de remontage et/ou de mise à l'heure du mouvement, et
  • un joint d'étanchéité tel que défini ci-dessus placé entre le tube et la couronne.
The present invention also proposes a timepiece comprising such a seal, in particular a timepiece comprising:
  • a movement,
  • a box containing the movement,
  • a tube protruding from the box,
  • a crown comprising a cap and a central portion engaged in the tube and coupled to a winding rod and / or setting the time of movement, and
  • a seal as defined above placed between the tube and the crown.

Avantageusement la couronne est de type vissé, c'est-à-dire qu'elle comprend un filetage pouvant coopérer avec un filetage du tube pour permettre un vissage de la couronne sur le tube.Advantageously, the ring is of the screw type, that is to say it comprises a thread that can cooperate with a thread of the tube to allow screwing of the ring on the tube.

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 :

  • la figure 1 est une vue en coupe axiale d'un joint d'étanchéité pour l'horlogerie selon l'invention à l'état de repos ;
  • la figure 2 est une vue en coupe axiale d'un dispositif de commande pour pièce d'horlogerie comprenant une couronne vissée et un joint d'étanchéité selon l'invention ;
  • la figure 3 est une vue en perspective éclatée du dispositif de commande de la figure 2.
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:
  • the figure 1 is an axial sectional view of a seal for the watchmaking according to the invention in the state of rest;
  • the figure 2 is an axial sectional view of a control device for a timepiece comprising a screwed crown and a seal according to the invention;
  • the figure 3 is an exploded perspective view of the control device of the figure 2 .

Comme montré à la figure 1, un joint d'étanchéité 1 pour l'horlogerie selon un mode de réalisation particulier de l'invention présente un axe de symétrie A et s'étend dans la direction de l'axe A entre une première extrémité 2 et une deuxième extrémité 3. Dans la suite de cette description, le terme « axial » se rapportera à la direction de l'axe A et le terme « radial » aux directions perpendiculaires à l'axe A.As shown in figure 1 , a seal 1 for the watchmaking according to a particular embodiment of the invention has an axis of symmetry A and extends in the direction of the axis A between a first end 2 and a second end 3. In the remainder of this description, the term "axial" will refer to the direction of the axis A and the term "radial" to the directions perpendicular to the axis A.

Le joint 1 comprend une partie de forme générale annulaire 4 terminée, à la première extrémité 2, par un épaulement 5. La partie de forme générale annulaire 4 comprend une surface intérieure 6 et une surface extérieure 7. Les surfaces intérieure et extérieure 6, 7 sont asymétriques l'une par rapport à l'autre. La surface intérieure 6 définit successivement, dans le sens allant de la première extrémité 2 à la deuxième extrémité 3, un premier lobe 8, une partie cylindrique 9 et un deuxième lobe 10. Par « lobe » on entend une saillie à section axiale arrondie ou, plus généralement, une saillie dont au moins l'extrémité présente une section axiale arrondie. Les lobes 8, 10 et la partie cylindrique 9 entourent chacun l'axe A. La surface extérieure 7 définit successivement, dans le sens allant de la première extrémité 2 à la deuxième extrémité 3, une partie cylindrique 11, un lobe 12 et une partie tronconique 13 dont le grand rayon jouxte le lobe 12 et le petit rayon correspond à la deuxième extrémité 3.The seal 1 comprises a portion of generally annular shape 4 terminated, at the first end 2, by a shoulder 5. The generally annular portion 4 comprises an inner surface 6 and an outer surface 7. The inner and outer surfaces 6, 7 are asymmetrical with respect to each other. The inner surface 6 defines successively, in the direction from the first end 2 to the second end 3, a first lobe 8, a cylindrical portion 9 and a second lobe 10. By "lobe" is meant a protrusion with a rounded axial section or , more generally, a projection of which at least the end has a rounded axial section. The lobes 8, 10 and the cylindrical portion 9 each surround the axis A. The outer surface 7 defines successively, in the direction from the first end 2 to the second end 3, a cylindrical portion 11, a lobe 12 and a portion frustoconical 13 whose large radius adjoins the lobe 12 and the small radius corresponds to the second end 3.

Le lobe 12 est en face de la partie cylindrique 9 tandis que les lobes 8, 10 sont en face respectivement de la partie cylindrique 11 et de la partie tronconique 13. La position axiale du lobe 12 est située entre les positions axiales respectives des lobes 8, 10 et est de préférence centrée par rapport auxdites positions axiales respectives, comme illustré. Dans la présente invention, la position axiale de chacun des lobes 8, 10, 12 est définie comme la position axiale de son sommet, c'est-à-dire de la ligne circulaire où le lobe est tangent à un cylindre d'axe A.The lobe 12 faces the cylindrical portion 9 while the lobes 8, 10 face respectively the cylindrical portion 11 and the frustoconical portion 13. The axial position of the lobe 12 is located between the respective axial positions of the lobes 8 , And is preferably centered with respect to said respective axial positions, as illustrated. In the present invention, the axial position of each of the lobes 8, 10, 12 is defined as the axial position of its vertex, that is to say of the circular line where the lobe is tangential to a cylinder of axis A .

L'épaulement 5 définit une surface d'appui 14 plane et orthogonale à l'axe A et une surface 15 opposée à la surface d'appui 14. Cette surface 15 définit un lobe 16 qui entoure l'axe A. Contrairement aux lobes 8, 10, 12, orientés radialement, le lobe 16 est donc orienté axialement. Le joint 1 peut ainsi apporter une étanchéité poussée en étant comprimé radialement dans des zones précises (les lobes 8, 10, 12) et comprimé axialement dans une autre zone bien définie (le lobe 16).The shoulder 5 defines a flat bearing surface 14 orthogonal to the axis A and a surface 15 opposite to the bearing surface 14. This surface 15 defines a lobe 16 which surrounds the axis A. Unlike the lobes 8 , 10, 12, oriented radially, the lobe 16 is oriented axially. The seal 1 can thus provide a tight seal by being compressed radially in specific areas (lobes 8, 10, 12) and axially compressed in another well-defined area (lobe 16).

Pour diminuer l'encombrement axial du joint 1, le lobe 8 est proche de la première extrémité 2, plus précisément le plan géométrique que définit la surface d'appui 14 coupe le lobe 8.To reduce the axial size of the seal 1, the lobe 8 is close to the first end 2, more precisely the geometric plane defined by the bearing surface 14 intersects the lobe 8.

Si cela est souhaité, et si le dispositif destiné à accueillir le joint 1 le permet, le joint 1 peut comporter un plus grand nombre de lobes que les quatre lobes 8, 10, 12, 16 décrits et illustrés.If desired, and if the device for receiving the seal 1 allows it, the seal 1 may have a greater number of lobes than the four lobes 8, 10, 12, 16 described and illustrated.

Le joint 1 avec sa partie de forme générale annulaire 4 et son épaulement 5 forme une seule pièce, constituée typiquement d'un élastomère tel qu'un nitrile. Le joint 1 est de préférence monolithique (en une seule matière) obtenu typiquement par moulage, mais il peut aussi être une pièce composite (en plusieurs matières) obtenu par exemple par collage de plusieurs parties ou par un procédé formant une liaison intime (par exemple moulage bimatière) entre plusieurs parties.The seal 1 with its generally annular shape portion 4 and its shoulder 5 forms a single piece, typically consisting of an elastomer such as a nitrile. The seal 1 is preferably monolithic (in a single material) typically obtained by molding, but it can also be a composite part (made of several materials) obtained for example by bonding several parts or by a process forming an intimate bond (for example two-component molding) between several parts.

Les figures 2 et 3 montrent un exemple d'application particulier du joint 1 selon l'invention. Dans ces figures, une pièce d'horlogerie, typiquement une montre-bracelet, comprend une boîte 17 renfermant un mouvement 18 et un dispositif de commande 19 fait saillie sur un côté de la boîte 17, de manière classique en soi, pour permettre la mise à l'heure et le remontage du mouvement 18. Le dispositif de commande 19 est du type à couronne vissée. Il comprend un tube 20 fixé, par exemple vissé ou chassé, dans un trou traversant la paroi de la boîte 17 et une couronne 21. La couronne 21 est formée de deux parties coaxiales, à savoir une coiffe 22 et un manchon central 23 fixé, par exemple vissé, dans le fond de la coiffe 22. En variante, la coiffe 22 et le manchon 23 pourraient être en une seule pièce. Le manchon 23 est engagé dans le tube 20 de manière mobile en translation et en rotation et reçoit un piston 24 et un ressort 25. Le ressort 25 est logé entre le fond de la coiffe 22 et un épaulement du piston 24. Le piston 24 est accouplé à une tige de remontage et de mise à l'heure 26 du mouvement 18.The figures 2 and 3 show an example of particular application of the seal 1 according to the invention. In these figures, a timepiece, typically a wristwatch, comprises a box 17 containing a movement 18 and a control device 19 protrudes on one side of the box 17, in a conventional manner per se, to allow the setting at the time and the reassembly of the movement 18. The control device 19 is of the type with screwed crown. It comprises a fixed tube 20, for example screwed or driven, in a hole through the wall of the box 17 and a ring 21. The ring 21 is formed of two coaxial parts, namely a cap 22 and a fixed central sleeve 23, for example, screwed into the bottom of the cap 22. Alternatively, the cap 22 and the sleeve 23 could be in one piece. The sleeve 23 is engaged in the tube 20 in a mobile manner in translation and in rotation and receives a piston 24 and a spring 25. The spring 25 is housed between the bottom of the cap 22 and a shoulder of the piston 24. The piston 24 is coupled to a winding and setting rod 26 of the movement 18.

Une jupe 27 de la coiffe 22 entourant le manchon 23 comprend un filetage interne 28 destiné à coopérer avec un filetage externe 29 du tube 20. La couronne 21 peut ainsi occuper :

  • une position vissée (représentée à la figure 2) où elle est vissée sur le tube 20 par coopération entre les filetages 28, 29 et où le ressort 25 est comprimé,
  • une position dévissée, plus éloignée axialement de la boîte 17 que la position vissée, où la couronne 21 est maintenue par le ressort 25 hors du filetage 29 du tube 20 et peut être tournée pour remonter le mouvement 18, et
  • une position tirée, plus éloignée axialement de la boîte 17 que la position dévissée, où une rotation de la couronne 21 permet une mise à l'heure.
A skirt 27 of the cap 22 surrounding the sleeve 23 comprises an internal thread 28 intended to cooperate with an external thread 29 of the tube 20. The crown 21 can thus occupy:
  • a screwed position (represented at figure 2 ) where it is screwed onto the tube 20 by cooperation between the threads 28, 29 and the spring 25 is compressed,
  • a position unscrewed, further axially away from the box 17 than the screwed position, where the ring 21 is held by the spring 25 out of the thread 29 of the tube 20 and can be rotated to raise the movement 18, and
  • a pulled position, further axially from the box 17 than the unscrewed position, where a rotation of the ring 21 allows a time setting.

Le manchon 23 est relié au piston 24 de manière connue en soi pour pouvoir se déplacer librement en rotation et en translation par rapport au piston 24 pendant le vissage et le dévissage de la couronne 21, et pour être solidaire du piston 24, et donc de la tige de remontage et de mise l'heure 26, en rotation dans la position dévissée ou tirée de la couronne 21 et en translation entre les positions dévissée et tirée de la couronne 21.The sleeve 23 is connected to the piston 24 in a manner known per se to be able to move freely in rotation and in translation relative to the piston 24 during the screwing and unscrewing of the ring 21, and to be secured to the piston 24, and therefore to the winding and setting rod 26, in rotation in the unscrewed or pulled position of the ring 21 and in translation between the unscrewed and pulled positions of the ring 21.

Le joint 1 selon l'invention est placé dans un logement ménagé entre le tube 20 et la couronne 21. Plus précisément, la partie de forme générale annulaire 4 est située dans un logement annulaire 30 délimité par le tube 20 et le manchon 23, et l'épaulement 5 repose par sa surface d'appui 14 sur l'extrémité du tube 20, entre le tube 20 et la coiffe 22. A la figure 2 le joint 1 est montré dans son état de repos non déformé. En pratique il est bien entendu contraint du fait des dimensions du logement 30 plus petites que certaines dimensions du joint 1. En particulier, les lobes 8, 10, 12, 16 sont comprimés et définissent des zones précises d'étanchéité. Par leur compression radiale entre le tube 20 et la couronne 21 les lobes 8, 10, 12 assurent une étanchéité dans toutes les positions axiales de la couronne 21. Par sa compression axiale entre le tube 20 et la couronne 21 le lobe 16 assure une étanchéité seulement dans la position vissée de la couronne 21, mais cette étanchéité est beaucoup plus forte que celle au niveau des lobes 8, 10, 12. En effet, le déplacement de la coiffe 22 qui comprime le lobe 16 et l'épaulement 5 est dans la direction de l'épaisseur de ces derniers alors que le déplacement du manchon 23 qui comprime les lobes 8, 10, 12 et la partie de forme générale annulaire 4 est tangentiel par rapport à ces derniers. La position vissée de la couronne 21 est sa position normale lorsque la montre est portée. Dans cette position, le fond de la coiffe 22 est de préférence en appui contre une surface de butée 31 du tube 20.The seal 1 according to the invention is placed in a housing formed between the tube 20 and the ring 21. More specifically, the generally annular portion 4 is located in an annular housing 30 defined by the tube 20 and the sleeve 23, and the shoulder 5 rests by its bearing surface 14 on the end of the tube 20, between the tube 20 and the cap 22. At the figure 2 the seal 1 is shown in its undeformed state of repose. In practice it is of course constrained because of the dimensions of the housing 30 smaller than certain dimensions of the seal 1. In particular, the lobes 8, 10, 12, 16 are compressed and define specific areas of sealing. By their radial compression between the tube 20 and the ring 21 the lobes 8, 10, 12 provide a seal in all positions axial axial of the ring 21. By its axial compression between the tube 20 and the ring 21 the lobe 16 provides a seal only in the screwed position of the ring 21, but this seal is much stronger than that at the lobes 8, 10 12. Indeed, the displacement of the cap 22 which compresses the lobe 16 and the shoulder 5 is in the direction of the thickness of the latter while the displacement of the sleeve 23 which compresses the lobes 8, 10, 12 and the generally annular shape portion 4 is tangential to these. The screwed position of the crown 21 is its normal position when the watch is worn. In this position, the bottom of the cap 22 is preferably in abutment against an abutment surface 31 of the tube 20.

La forme du joint 1 lui confère une grande souplesse et améliore ainsi l'étanchéité. En effet, lors du montage, dès qu'un lobe 8, 10, 12 est comprimé, la matière du joint 1 peut fuir vers le côté opposé au lobe en remplissant l'espace vide qui existait entre ce côté opposé et le tube 20 ou manchon 23. La partie tronconique 13 de la surface extérieure 7 permet de mieux adapter le joint 1 à la forme annulaire du logement 30. En variante, toutefois, cette partie tronconique 13 pourrait être remplacée par une partie cylindrique.The shape of the seal 1 gives it great flexibility and thus improves the seal. Indeed, during assembly, as soon as a lobe 8, 10, 12 is compressed, the material of the seal 1 can leak towards the opposite side to the lobe by filling the empty space that existed between this opposite side and the tube 20 or sleeve 23. The frustoconical portion 13 of the outer surface 7 makes it possible to better adapt the seal 1 to the annular shape of the housing 30. As a variant, however, this frustoconical portion 13 could be replaced by a cylindrical portion.

Un décrochement 32 pratiqué sur la surface intérieure du tube 20 coopère avec le lobe 12 pour retenir le joint 1 dans le logement 30 lorsque la couronne 21 est dévissée et lorsqu'elle est tirée depuis sa position dévissée.A recess 32 formed on the inner surface of the tube 20 cooperates with the lobe 12 to retain the seal 1 in the housing 30 when the ring 21 is unscrewed and when pulled from its unscrewed position.

Le fait qu'un seul joint 1 assure l'étanchéité complète du dispositif de commande 19 facilite l'assemblage de ce dernier. Dès qu'il est placé dans le tube 20, le joint 1 est bien visible grâce à l'épaulement 5 qui repose sur l'extrémité du tube 20. On peut alors assembler la couronne 21 au tube 20 en étant certain de n'avoir omis de monter aucun joint d'étanchéité. En effet, avec les joints de l'état de la technique il peut arriver qu'un joint torique devant être placé dans une gorge du tube soit omis et qu'un joint plat monté, lui, sur l'extrémité du tube (à l'instar de l'épaulement 5) empêche l'horloger de se rendre compte de son erreur.The fact that a single seal 1 ensures complete sealing of the control device 19 facilitates the assembly of the latter. As soon as it is placed in the tube 20, the seal 1 is clearly visible thanks to the shoulder 5 which rests on the end of the tube 20. It is then possible to assemble the ring 21 to the tube 20 while being certain of not having failed to mount any gasket. Indeed, with the joints of the state of the art it may happen that an O-ring to be placed in a groove of the tube is omitted and a flat seal mounted on the end of the tube (at the end of the tube). Like the shoulder 5) prevents the watchmaker from realizing his error.

De plus, du fait qu'un seul (grand) logement 30 accueille le joint 1 avec ses lobes 8, 10, 12, l'usinage du tube 20 est facilité par rapport aux tubes de l'état de la technique où une ou plusieurs gorges reçoivent respectivement les joints toriques assurant l'étanchéité entre le tube et le manchon.In addition, because only one (large) housing 30 accommodates the seal 1 with its lobes 8, 10, 12, the machining of the tube 20 is facilitated compared to the tubes of the state of the art where one or more grooves respectively receive the O-rings ensuring the seal between the tube and the sleeve.

Dans une variante (non représentée) de l'invention, la partie de forme générale annulaire 4 du joint 1 est placée entre la jupe 27 de la coiffe 22 et le tube 20. Dans cette variante, l'épaulement 5 repose encore sur l'extrémité du tube 20 mais il est orienté vers l'intérieur (vers l'axe A) plutôt que vers l'extérieur. Les filetages 28, 29 permettant de visser la couronne 21 sur le tube 20 sont eux situés respectivement sur la surface intérieure du tube 20 et la surface extérieure du manchon 23. Enfin, les surfaces intérieure et extérieure 6, 7 de la partie de forme générale annulaire sont inversées, c'est-à-dire que la surface extérieure 7 comprend les lobes 8, 10 et la partie cylindrique 9 et la surface intérieure 6 comprend le lobe 12, la partie cylindrique 11 et la partie tronconique 13.In a variant (not shown) of the invention, the generally annular portion 4 of the gasket 1 is placed between the skirt 27 of the cap 22 and the tube 20. In this variant, the shoulder 5 still rests on the end of the tube 20 but is oriented inwards (towards the axis A) rather than outwards. The threads 28, 29 for screwing the ring 21 onto the tube 20 are located respectively on the inner surface of the tube 20 and the outer surface of the sleeve 23. Finally, the inner and outer surfaces 6, 7 of the generally shaped part. annular are reversed, that is to say that the outer surface 7 comprises the lobes 8, 10 and the cylindrical portion 9 and the inner surface 6 comprises the lobe 12, the cylindrical portion 11 and the frustoconical portion 13.

Le joint 1 selon l'invention peut être utilisé dans d'autres applications qu'une couronne vissée, par exemple une couronne classique non vissée ou un poussoir. Dans de telles applications, l'épaulement 5 peut être supprimé.The seal 1 according to the invention can be used in other applications than a screwed crown, for example a conventional non-screwed crown or a pusher. In such applications, the shoulder 5 can be removed.

Claims (13)

  1. Sealing joint (1) for timepieces comprising an internal surface (6) and an external surface (7) surrounding a common axis (A), a first one (6) of the internal and external surfaces comprising first and second lobes (8, 10) surrounding said axis (A) at different respective axial positions, a second one (7) of the internal and external surfaces being asymmetric with respect to the first one (6) of the internal and external surfaces, characterised in that said second one (7) of the internal and external surfaces comprises, at an axial position located between the respective axial positions of the first and second lobes (8, 10), a third lobe (12) surrounding said axis (A).
  2. Sealing joint (1) as claimed in claim 1, characterised in that the third lobe (12) is axially substantially centred with respect to the first and second lobes (8, 10).
  3. Sealing joint (1) as claimed in claim 1 or 2, characterised in that the first one (6) of the internal and external surfaces comprises, facing the third lobe (12), a substantially cylindrical surface portion (9).
  4. Sealing joint (1) as claimed in any one of claims 1 to 3, characterised in that the second one (7) of the internal and external surfaces comprises, facing the first lobe (8), a substantially cylindrical surface portion (11).
  5. Sealing joint (1) as claimed in any one of claims 1 to 4, characterised in that the second one (7) of the internal and external surfaces comprises, opposite the second lobe (10), a substantially frusto-conical or cylindrical surface portion (13).
  6. Sealing joint (1) as claimed in any one of claims 1 to 5, characterised in that it further comprises, at one (2) of its two axial ends (2, 3), a shoulder (5) surrounding said axis (A) and defining a substantially planar bearing surface (14) substantially orthogonal to said axis (A).
  7. Sealing joint (1) as claimed in claim 6, characterised in that the shoulder (5) comprises, opposite the bearing surface (14), a fourth lobe (16) surrounding said axis (A).
  8. Sealing joint (1) as claimed in claim 6 or 7, characterised in that the plane of the bearing surface (14) intersects the first lobe (8).
  9. Sealing joint as claimed in any one of claims 1 to 8, characterised in that the first one (6) of the internal and external surfaces is the internal surface and the second one (7) of the internal and external surfaces is the external surface.
  10. Timepiece comprising a sealing joint (1) as claimed in any one of claims 1 to 9.
  11. Timepiece comprising
    - a movement (18),
    - a casing (17) enclosing the movement (18),
    - a tube (20) protruding from the casing (17),
    - a crown (21) comprising a cap (22) and a central portion (23) engaged into the tube (20) and coupled to a winding and/or time-setting stem (26) of the movement (18), and
    - a sealing joint (1) as claimed in any one of claims 1 to 9 placed between the tube (20) and the crown (21).
  12. Timepiece as claimed in claim 11, characterised in that the sealing joint (1) is placed at least partly between the tube (20) and the central portion (23) of the crown (21).
  13. Timepiece as claimed in claim 11 or 12, characterised in that the crown (21) comprises a thread (28) able to cooperate with a thread (29) of the tube (20) to allow screwing of the crown (21) on the tube (20).
EP16198214.5A 2016-11-10 2016-11-10 Seal for timepieces Active EP3321749B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16198214.5A EP3321749B1 (en) 2016-11-10 2016-11-10 Seal for timepieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16198214.5A EP3321749B1 (en) 2016-11-10 2016-11-10 Seal for timepieces

Publications (2)

Publication Number Publication Date
EP3321749A1 EP3321749A1 (en) 2018-05-16
EP3321749B1 true EP3321749B1 (en) 2019-09-25

Family

ID=57281155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16198214.5A Active EP3321749B1 (en) 2016-11-10 2016-11-10 Seal for timepieces

Country Status (1)

Country Link
EP (1) EP3321749B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3805869A1 (en) * 2019-10-09 2021-04-14 Meco S.A. Threaded crown

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655166B1 (en) * 1989-11-27 1992-02-28 Ebel Sa Fabrique WATERPROOFING DEVICE FOR A WATCHMAKING PIECE.
FR2786574B1 (en) * 1998-11-30 2001-02-16 Ebel Sa WATERPROOFING GASKET AND WATERPROOFING DEVICE FOR A WATCHMAKING PART
CH708126B1 (en) 2013-05-30 2017-10-31 Boninchi Sa Seal, pusher and crown of timepiece.
EP2866100B1 (en) * 2013-10-25 2017-05-24 Meco S.A. Seal for a clock piece

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3321749A1 (en) 2018-05-16

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