EP2874022B1 - Watch case including a bayonet connection - Google Patents

Watch case including a bayonet connection Download PDF

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Publication number
EP2874022B1
EP2874022B1 EP13193034.9A EP13193034A EP2874022B1 EP 2874022 B1 EP2874022 B1 EP 2874022B1 EP 13193034 A EP13193034 A EP 13193034A EP 2874022 B1 EP2874022 B1 EP 2874022B1
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EP
European Patent Office
Prior art keywords
lug
watch case
determined
pieces
strip
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EP13193034.9A
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German (de)
French (fr)
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EP2874022A1 (en
Inventor
Julien Schambacher
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Chopard Technologies SA
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Chopard Technologies SA
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Publication date
Application filed by Chopard Technologies SA filed Critical Chopard Technologies SA
Priority to EP13193034.9A priority Critical patent/EP2874022B1/en
Priority to JP2016553746A priority patent/JP6459009B2/en
Priority to PCT/IB2014/002361 priority patent/WO2015071719A2/en
Priority to CN201480051907.9A priority patent/CN105814497B/en
Publication of EP2874022A1 publication Critical patent/EP2874022A1/en
Application granted granted Critical
Publication of EP2874022B1 publication Critical patent/EP2874022B1/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
    • G04B37/00—Cases
    • G04B37/0008—Cases for pocket watches and wrist watches
    • G04B37/0033—Cases for pocket watches and wrist watches with cover or bottom which can slide or turn (without a spring action)
    • 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
    • G04B37/0008—Cases for pocket watches and wrist watches
    • G04B37/0041—Cases for pocket watches and wrist watches the cover or the bottom can slide or turn with a spring action

Definitions

  • the present invention relates to a watch case comprising a bayonet link.
  • Such an assembly allows a precise relative angular positioning of the two parts of the box that constitute the bezel and the bottom-middle and avoids the use of screw connections.
  • inserts namely the leaf springs, to lock the lugs in the grooves.
  • the present invention aims to overcome this disadvantage and proposes for this purpose a watch case comprising first and second parts assembled by a bayonet connection, the bayonet connection comprising at least one lug defined by the first piece and at least one groove defined by the second piece, the groove defining a tongue and comprising a bottom and an inlet through which, during assembly of the first and second parts, the lug can be introduced into the groove parallel to a given axis, the lug being then be brought to the bottom by a relative rotation of the first and second parts about the determined axis and in a specific direction, the tongue comprising an inner face comprising a first portion, inclined, extending towards the bottom to a determined point and a second part located in the bottom, after the determined point, the first and second pieces further comprising respective rigid surfaces facing each other in the direction of the determined axis, characterized in that the second portion of the inner face of the tongue is recessed relative to a plane perpendicular to the determined axis and passing through the determined point, and in that the first and second
  • the groove that defines the elastic locking means of the lug.
  • the groove thus fulfills both a guide function of the lug, during assembly, and locking of said lug, at the end of the assembly. No added locking element is required in the present invention.
  • the tongue comprises a free end arranged to bear against the first part during the elastic deformation of the tongue to prevent the tongue from exceeding its elastic limit.
  • the watch case according to the invention further comprises a seal between the first and second pieces.
  • the seal is compressed in the direction of the determined axis. In another embodiment, the seal is compressed radially relative to the determined axis.
  • the bayonet connection may comprise a plurality of said lugs and several said respective grooves.
  • the lugs, respectively the grooves are preferably regularly distributed around the determined axis.
  • one of the first and second parts comprises a middle and the other of the first and second parts comprises a bottom box.
  • the part comprising the caseband is said first piece and the piece comprising the caseback is said second piece.
  • a watch case according to the invention comprises a middle-bezel 1 and a bottom 2 assembled by a bayonet connection.
  • the bayonet connection comprises grooves 3, three in number in the illustrated example, formed in an annular peripheral wall 4 of the bottom 2 and corresponding lugs 5 protruding from the inner face of the wall of the middle case-bezel 1.
  • the grooves 3, respectively the lugs 5, are identical and regularly distributed around the axis A of the watch case.
  • each groove 3 comprises an inlet 6, made in the upper surface 7 of the annular peripheral wall 4, and a bottom 8.
  • Each groove 3 defines in the annular peripheral wall 4 a tongue 9 whose attachment end 10 is at the level of the bottom 8 and whose free end 11 partially delimits the inlet 6.
  • the tongue 9 comprises an inner face 12, constituting a wall of the groove 3 and extending from the inlet 6 to the bottom 8, and a external face 13 opposite the inner face 12 and forming part of the upper surface 7 of the annular peripheral wall 4.
  • the outer face 13 extends in a plane P1 perpendicular to the axis A , that is to say parallel to the plane of the watch case.
  • the outer face 13 may nevertheless comprise a boss 13a in the area of the free end 11, the hump whose function will be explained later.
  • the inner face 12 comprises a first portion 14 extending (in profile) from the inlet 6 to a point P and a second portion 15 extending after the point P and partially delimiting the bottom 8.
  • the first part 14 is inclined relative to the plane P1 and thus gives the tongue 9 a greater thickness in the area of the point P than in an area closer to the free end 11.
  • the second portion 15 extends parallel to the plane P1 and is set back from a plane P2 parallel to the plane P1 and passing through the point P, that is to say is distant from this plane P2 and located on the same side of the plane P2 as the first part 14.
  • an intermediate portion 16 which is inclined in the opposite direction to the direction of inclination of the first part 14 and whose slope is steeper than the slope of inclination of the first portion 14.
  • the bottom 2 of the watch case further comprises, beyond radially of the annular peripheral wall 4, an annular shoulder 17.
  • This annular shoulder 17 is opposite an annular surface 18 of the wall of the case-case 1
  • the shoulder 17 and the surface 18 each extend in a plane perpendicular to the axis A and, in practice, are in contact or almost in contact.
  • a groove 19 made in the surface 18 houses an O-ring 20 (cf. figures 2 and 5 ) which ensures the seal between the middle-telescope 1 and the bottom 2.
  • the figure 5 shows how the middle-bezel 1 and the bottom 2 are assembled.
  • the lugs 5 are introduced into the grooves 3 by bringing the middle-bezel 1 of the bottom 2 axially (that is to say in the direction of the axis A) until the seal 20, which beyond the surface 18, come to rest on the shoulder 17 ( Figure 5 (b) ).
  • the caseband 1 is rotated relative to the bottom 2 about the axis A to move the lugs 5 towards the bottom 8 of the grooves 3 (FIG. Figure 5 (c) ).
  • the lugs 5 bring the middle part-bezel 1 closer to the base 2 by compressing the joint 20 until the surface 18 and the shoulder 17 come into contact ( Figure 5 (d) ).
  • the lugs 5 have not yet reached the point P and the middle-bezel 1 and the bottom 2 can not be brought closer together axially because the contact surfaces 17, 18 are rigid.
  • the rotation of the middle part-bezel 1 with respect to the bottom 2 then causes an elastic deformation of the tongues 9 allowing the lugs 5 to pass the point P and to enter the bottom 8 of the grooves 3 (FIG. figure 5 (e) ).
  • the middle-bezel 1 To ensure that the elastic limit of the tongues 9 will not be exceeded, one can arrange the middle-bezel 1 so that the zone of the free end 11 of the tongues 9, more precisely the boss 13a, abuts against a shoulder internal 25 of the middle-bezel 1 at the moment when the lugs 5 arrive at the point P.
  • the final elastic deformation of the tongues 9 allowing the passage of the lugs 5 in the bottom 8 is then in their central part.
  • the bumps 13a make it possible to define well defined support zones between the tongues 9 and the shoulder 25.
  • the height of the second portion 15 of the inner surface 12 of the tongues 9 is chosen so that the surface 18 and the shoulder 17 are kept in contact or almost in contact when the lugs 5 are in the bottom 8 of the grooves 3.
  • the middle-bezel 1 and the bottom 2 leave no day between them and the seal 20 is not visible from the outside, which contributes to the aesthetics of the box.
  • the contact between the surface 18 and the shoulder 17 ensures that the seal 20 is in a determined compressed state, considered sufficient for a good seal of the box.
  • the assembly according to the invention is very precise in that once locked in the bottom 8 of the grooves 3, the lugs 5 define a relative angular position determined for the middle-bezel 1 and the bottom 2. Thus, if the bottom 2 has a decor, it can be guaranteed that it will be correctly positioned relative to the middle-bezel 1 and its horns in particular.
  • the seal 20 is arranged to compress axially (parallel to the axis A).
  • the seal may be arranged to compress radially.
  • the figure 6 shows such variant, with the seal, designated by the reference 21, housed in a groove 22 formed in an outer side surface of the bottom and a wall 23 of the middle-bezel to compress the seal 21 during assembly until it stops against a shoulder 24 of the bottom.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Casings For Electric Apparatus (AREA)
  • Electric Clocks (AREA)
  • Adornments (AREA)
  • Connection Of Plates (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

Description

La présente invention concerne une boîte de montre comprenant une liaison à baïonnette.The present invention relates to a watch case comprising a bayonet link.

On connaît par le brevet CH 118.038 une boîte de montre dont la lunette est assemblée à un fond-carrure par une liaison à baïonnette comprenant des ergots définis par la lunette et engagés dans des rainures définies par le fond-carrure. Entre leur entrée et leur fond les rainures sont inclinées afin qu'une fois les ergots introduits dans les rainures, une rotation relative de la lunette et du fond-carrure rapproche axialement ces deux pièces l'une de l'autre jusqu'à ce que les ergots atteignent le fond des rainures. Des ressorts-lames munis chacun d'un nez verrouillent les ergots dans le fond des rainures.We know by the patent CH 118.038 a watch case whose bezel is assembled to a bottom-middle by a bayonet connection comprising lugs defined by the bezel and engaged in grooves defined by the bottom-middle. Between their entry and their bottom the grooves are inclined so that once the lugs inserted into the grooves, a relative rotation of the bezel and the bottom-middle axially brings these two parts together until the lugs reach the bottom of the grooves. Leaf springs each provided with a nose lock the lugs in the bottom of the grooves.

Un tel assemblage permet un positionnement angulaire relatif précis des deux parties de la boîte que constituent la lunette et le fond-carrure et évite le recours à des liaisons par vissage. Toutefois il nécessite l'emploi d'éléments rapportés, à savoir les ressorts-lames, pour verrouiller les ergots dans les rainures.Such an assembly allows a precise relative angular positioning of the two parts of the box that constitute the bezel and the bottom-middle and avoids the use of screw connections. However it requires the use of inserts, namely the leaf springs, to lock the lugs in the grooves.

La présente invention vise à remédier à cet inconvénient et propose à cette fin une boîte de montre comprenant des première et deuxième pièces assemblées par une liaison à baïonnette, la liaison à baïonnette comprenant au moins un ergot défini par la première pièce et au moins une rainure définie par la deuxième pièce, la rainure définissant une languette et comprenant un fond et une entrée par laquelle, pendant l'assemblage des première et deuxième pièces, l'ergot peut être introduit dans la rainure parallèlement à un axe déterminé, l'ergot pouvant ensuite être amené vers le fond par une rotation relative des première et deuxième pièces autour de l'axe déterminé et dans un sens déterminé, la languette comprenant une face intérieure comprenant une première partie, inclinée, s'étendant en direction du fond jusqu'à un point déterminé et une deuxième partie située dans le fond, après le point déterminé, les première et deuxième pièces comprenant en outre des surfaces rigides respectives en regard l'une de l'autre dans la direction de l'axe déterminé, caractérisée en ce que la deuxième partie de la face intérieure de la languette est en retrait par rapport à un plan perpendiculaire à l'axe déterminé et passant par le point déterminé, et en ce que les première et deuxième pièces sont agencées pour que lorsque, pendant leur assemblage, elles sont en butée l'une contre l'autre dans la direction de l'axe déterminé par un contact entre les surfaces rigides et que l'ergot est dans la rainure, une rotation relative des première et deuxième pièces autour de l'axe déterminé et dans le sens déterminé entraîne une déformation élastique de la languette par une coopération entre l'ergot et la première partie de la face intérieure de la languette, la languette revenant à sa position de repos une fois que l'ergot se trouve dans le fond de la rainure pour verrouiller l'ergot en position.The present invention aims to overcome this disadvantage and proposes for this purpose a watch case comprising first and second parts assembled by a bayonet connection, the bayonet connection comprising at least one lug defined by the first piece and at least one groove defined by the second piece, the groove defining a tongue and comprising a bottom and an inlet through which, during assembly of the first and second parts, the lug can be introduced into the groove parallel to a given axis, the lug being then be brought to the bottom by a relative rotation of the first and second parts about the determined axis and in a specific direction, the tongue comprising an inner face comprising a first portion, inclined, extending towards the bottom to a determined point and a second part located in the bottom, after the determined point, the first and second pieces further comprising respective rigid surfaces facing each other in the direction of the determined axis, characterized in that the second portion of the inner face of the tongue is recessed relative to a plane perpendicular to the determined axis and passing through the determined point, and in that the first and second pieces are arranged so that, during their assembly, they abut against each other in the direction of the axis determined by a contact between the rigid surfaces and that the lug is in the groove, a relative rotation of the first and second parts around the determined axis and in the determined direction causes an elastic deformation of the tongue by a cooperation between the lug and the first part of the inner face of the tongue, the tongue returning to its rest position once the lug is in the bottom of the groove to lock the lug in position.

Ainsi, dans la présente invention, c'est la forme même de la rainure qui définit les moyens élastiques de verrouillage de l'ergot. La rainure remplit donc à la fois une fonction de guidage de l'ergot, lors de l'assemblage, et de verrouillage dudit ergot, à la fin de l'assemblage. Aucun élément de verrouillage rapporté n'est nécessaire dans la présente invention.Thus, in the present invention, it is the shape of the groove that defines the elastic locking means of the lug. The groove thus fulfills both a guide function of the lug, during assembly, and locking of said lug, at the end of the assembly. No added locking element is required in the present invention.

Avantageusement, entre le point déterminé et la deuxième partie de la surface intérieure de la languette se trouve une partie inclinée de pente plus raide que ladite première partie, permettant ainsi que le couple à appliquer pour faire sortir l'ergot du fond de la rainure soit plus grand que le couple à appliquer pour faire entrer l'ergot dans ledit fond de la rainure.Advantageously, between the determined point and the second portion of the inner surface of the tongue is an inclined portion of steeper slope than said first portion, thus allowing the torque to be applied to pull out the lug from the bottom of the groove is greater than the torque to be applied to bring the pin into said bottom of the groove.

De préférence, la languette comprend une extrémité libre agencée pour venir en appui contre la première pièce pendant la déformation élastique de la languette afin d'empêcher la languette de dépasser sa limite élastique.Preferably, the tongue comprises a free end arranged to bear against the first part during the elastic deformation of the tongue to prevent the tongue from exceeding its elastic limit.

De préférence, la boîte de montre selon l'invention comprend en outre un joint d'étanchéité entre les première et deuxième pièces. Dans un mode de réalisation, le joint d'étanchéité est comprimé dans la direction de l'axe déterminé. Dans un autre mode de réalisation, le joint d'étanchéité est comprimé radialement par rapport à l'axe déterminé.Preferably, the watch case according to the invention further comprises a seal between the first and second pieces. In one embodiment, the seal is compressed in the direction of the determined axis. In another embodiment, the seal is compressed radially relative to the determined axis.

La liaison à baïonnette peut comprendre plusieurs dits ergots et plusieurs dites rainures respectives. Dans ce cas, les ergots, respectivement les rainures, sont de préférence régulièrement répartis autour de l'axe déterminé.The bayonet connection may comprise a plurality of said lugs and several said respective grooves. In this case, the lugs, respectively the grooves, are preferably regularly distributed around the determined axis.

Typiquement, l'une des première et deuxième pièces comprend une carrure et l'autre des première et deuxième pièces comprend un fond de boîte. Par exemple, la pièce comprenant la carrure est ladite première pièce et la pièce comprenant le fond de boîte est ladite deuxième pièce.Typically, one of the first and second parts comprises a middle and the other of the first and second parts comprises a bottom box. For example, the part comprising the caseband is said first piece and the piece comprising the caseback is said second piece.

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 perspective de dessus d'une boîte de montre selon un mode de réalisation de l'invention en position désassemblée ;
  • la figure 2 est une vue en perspective de dessous d'une carrure-lunette faisant partie de la boîte de montre illustrée à la figure 1 ;
  • la figure 3 est une vue en perspective de dessus d'un fond faisant partie de la boîte de montre illustrée à la figure 1 ;
  • la figure 4 est une vue partielle de profil du fond illustré à la figure 3, montrant une rainure de liaison à baïonnette ;
  • la figure 5 montre différentes positions relatives successives de la carrure-lunette et du fond de la boîte de montre illustrée à la figure 1 pendant l'assemblage de cette boîte ;
  • la figure 6 montre différentes positions relatives successives de la carrure-lunette et du fond d'une boîte de montre selon un autre mode de réalisation de l'invention pendant l'assemblage de cette boîte.
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 a perspective view from above of a watch case according to an embodiment of the invention in disassembled position;
  • the figure 2 is a perspective view from below of a middle part-bezel forming part of the watch case illustrated in FIG. figure 1 ;
  • the figure 3 is a perspective view from above of a bottom part of the watch case illustrated in FIG. figure 1 ;
  • the figure 4 is a partial profile view of the bottom shown in the figure 3 showing a bayonet connection groove;
  • the figure 5 shows different successive relative positions of the middle-bezel and the bottom of the watch case illustrated in FIG. figure 1 during assembly of this box;
  • the figure 6 shows different successive relative positions of the middle-bezel and the bottom of a watch case according to another embodiment of the invention during the assembly of this box.

En référence aux figures 1 à 4, une boîte de montre selon l'invention comprend une carrure-lunette 1 et un fond 2 assemblés par une liaison à baïonnette. La liaison à baïonnette comprend des rainures 3, au nombre de trois dans l'exemple illustré, formées dans une paroi périphérique annulaire 4 du fond 2 et des ergots correspondants 5 faisant saillie sur la face interne de la paroi de la carrure-lunette 1. Les rainures 3, respectivement les ergots 5, sont identiques et régulièrement répartis autour de l'axe A de la boîte de montre.With reference to Figures 1 to 4 , a watch case according to the invention comprises a middle-bezel 1 and a bottom 2 assembled by a bayonet connection. The bayonet connection comprises grooves 3, three in number in the illustrated example, formed in an annular peripheral wall 4 of the bottom 2 and corresponding lugs 5 protruding from the inner face of the wall of the middle case-bezel 1. The grooves 3, respectively the lugs 5, are identical and regularly distributed around the axis A of the watch case.

En référence plus particulièrement à la figure 4, chaque rainure 3 comprend une entrée 6, pratiquée dans la surface supérieure 7 de la paroi périphérique annulaire 4, et un fond 8. Chaque rainure 3 définit dans la paroi périphérique annulaire 4 une languette 9 dont l'extrémité de rattachement 10 se situe au niveau du fond 8 et dont l'extrémité libre 11 délimite en partie l'entrée 6. La languette 9 comprend une face intérieure 12, constituant une paroi de la rainure 3 et s'étendant de l'entrée 6 au fond 8, et une face extérieure 13 opposée à la face intérieure 12 et faisant partie de la surface supérieure 7 de la paroi périphérique annulaire 4. Comme le reste de la surface supérieure 7, la face extérieure 13 s'étend dans un plan P1 perpendiculaire à l'axe A, c'est-à-dire parallèle au plan de la boîte de montre. La face extérieure 13 peut néanmoins comprendre une bosse 13a dans la zone de l'extrémité libre 11, bosse dont la fonction sera expliquée plus loin. La face intérieure 12 comprend une première partie 14 s'étendant (en vue de profil) de l'entrée 6 à un point P et une deuxième partie 15 s'étendant après le point P et délimitant en partie le fond 8. La première partie 14 est inclinée par rapport au plan P1 et confère ainsi à la languette 9 une plus grande épaisseur dans la zone du point P que dans une zone plus proche de l'extrémité libre 11. La deuxième partie 15 s'étend parallèlement au plan P1 et est en retrait par rapport à un plan P2 parallèle au plan P1 et passant par le point P, c'est-à-dire est distant de ce plan P2 et situé du même côté du plan P2 que la première partie 14. En terme d'épaisseur, cela implique que l'épaisseur de la languette 9 dans la zone de la deuxième partie 15 est plus petite que celle dans la zone du point P. Entre le point P et la deuxième partie 15 se trouve une partie intermédiaire 16 qui est inclinée dans le sens inverse du sens d'inclinaison de la première partie 14 et dont la pente est plus raide que la pente d'inclinaison de la première partie 14.With particular reference to the figure 4 each groove 3 comprises an inlet 6, made in the upper surface 7 of the annular peripheral wall 4, and a bottom 8. Each groove 3 defines in the annular peripheral wall 4 a tongue 9 whose attachment end 10 is at the level of the bottom 8 and whose free end 11 partially delimits the inlet 6. The tongue 9 comprises an inner face 12, constituting a wall of the groove 3 and extending from the inlet 6 to the bottom 8, and a external face 13 opposite the inner face 12 and forming part of the upper surface 7 of the annular peripheral wall 4. Like the remainder of the upper surface 7, the outer face 13 extends in a plane P1 perpendicular to the axis A , that is to say parallel to the plane of the watch case. The outer face 13 may nevertheless comprise a boss 13a in the area of the free end 11, the hump whose function will be explained later. The inner face 12 comprises a first portion 14 extending (in profile) from the inlet 6 to a point P and a second portion 15 extending after the point P and partially delimiting the bottom 8. The first part 14 is inclined relative to the plane P1 and thus gives the tongue 9 a greater thickness in the area of the point P than in an area closer to the free end 11. The second portion 15 extends parallel to the plane P1 and is set back from a plane P2 parallel to the plane P1 and passing through the point P, that is to say is distant from this plane P2 and located on the same side of the plane P2 as the first part 14. In terms of thickness, this implies that the thickness of the tongue 9 in the area of the second portion 15 is smaller than that in the area of the point P. Between the point P and the second portion 15 is an intermediate portion 16 which is inclined in the opposite direction to the direction of inclination of the first part 14 and whose slope is steeper than the slope of inclination of the first portion 14.

Le fond 2 de la boîte de montre comprend en outre, au-delà radialement de la paroi périphérique annulaire 4, un épaulement annulaire 17. Cet épaulement annulaire 17 est en regard d'une surface annulaire 18 de la paroi de la carrure-lunette 1. L'épaulement 17 et la surface 18 s'étendent chacun dans un plan perpendiculaire à l'axe A et, en pratique, sont en contact ou quasiment en contact. Une gorge 19 pratiquée dans la surface 18 loge un joint torique 20 (cf. figures 2 et 5) qui assure l'étanchéité entre la carrure-lunette 1 et le fond 2.The bottom 2 of the watch case further comprises, beyond radially of the annular peripheral wall 4, an annular shoulder 17. This annular shoulder 17 is opposite an annular surface 18 of the wall of the case-case 1 The shoulder 17 and the surface 18 each extend in a plane perpendicular to the axis A and, in practice, are in contact or almost in contact. A groove 19 made in the surface 18 houses an O-ring 20 (cf. figures 2 and 5 ) which ensures the seal between the middle-telescope 1 and the bottom 2.

La figure 5 montre comment la carrure-lunette 1 et le fond 2 sont assemblés. On commence par aligner les ergots 5 et les entrées 6 des rainures 3 (figure 5(a)), puis on introduit les ergots 5 dans les rainures 3 en rapprochant la carrure-lunette 1 du fond 2 axialement (c'est-à-dire dans la direction de l'axe A) jusqu'à ce que le joint 20, qui dépasse la surface 18, vienne reposer sur l'épaulement 17 (figure 5(b)). Ensuite, on tourne la carrure-lunette 1 par rapport au fond 2 autour de l'axe A pour déplacer les ergots 5 vers le fond 8 des rainures 3 (figure 5(c)). En glissant sur la première partie, inclinée, 14 des languettes 9, les ergots 5 rapprochent encore axialement la carrure-lunette 1 du fond 2 en comprimant le joint 20 jusqu'à ce que la surface 18 et l'épaulement 17 entrent en contact (figure 5(d)). A ce stade de l'assemblage, les ergots 5 n'ont pas encore atteint le point P et la carrure-lunette 1 et le fond 2 ne peuvent plus être rapprochés davantage axialement car les surfaces en contact 17, 18 sont rigides. La rotation de la carrure-lunette 1 par rapport au fond 2 entraîne alors une déformation élastique des languettes 9 permettant aux ergots 5 de passer le point P et d'entrer dans le fond 8 des rainures 3 (figure 5(e)). Pour garantir que la limite élastique des languettes 9 ne sera pas dépassée, on peut agencer la carrure-lunette 1 de telle sorte que la zone de l'extrémité libre 11 des languettes 9, plus précisément la bosse 13a, soit en butée contre un épaulement interne 25 de la carrure-lunette 1 au moment où les ergots 5 arrivent au point P. La déformation élastique finale des languettes 9 permettant le passage des ergots 5 dans le fond 8 se fait alors dans leur partie centrale. Les bosses 13a permettent de définir des zones d'appui bien délimitées entre les languettes 9 et l'épaulement 25. Une fois que les ergots 5 ont complètement passé le point P et sont dans le fond 8 des rainures 3, les languettes 9 reviennent à leur position de repos et verrouillent ainsi les ergots 5 en position (figure 5(f)). La hauteur de la deuxième partie 15 de la surface intérieure 12 des languettes 9 est choisie pour que la surface 18 et l'épaulement 17 soient maintenus en contact ou quasiment en contact lorsque les ergots 5 sont dans le fond 8 des rainures 3. Ainsi, dans leur état assemblé, la carrure-lunette 1 et le fond 2 ne laissent aucun jour entre eux et le joint 20 n'est pas visible de l'extérieur, ce qui contribue à l'esthétique de la boîte. De plus, le contact entre la surface 18 et l'épaulement 17 garantit que le joint 20 est dans un état comprimé déterminé, jugé suffisant pour une bonne étanchéité de la boîte.The figure 5 shows how the middle-bezel 1 and the bottom 2 are assembled. We start by aligning the pins 5 and the inputs 6 of the grooves 3 ( Figure 5 (a) ), then the lugs 5 are introduced into the grooves 3 by bringing the middle-bezel 1 of the bottom 2 axially (that is to say in the direction of the axis A) until the seal 20, which beyond the surface 18, come to rest on the shoulder 17 ( Figure 5 (b) ). Then, the caseband 1 is rotated relative to the bottom 2 about the axis A to move the lugs 5 towards the bottom 8 of the grooves 3 (FIG. Figure 5 (c) ). By sliding on the first inclined portion 14 of the tongues 9, the lugs 5 bring the middle part-bezel 1 closer to the base 2 by compressing the joint 20 until the surface 18 and the shoulder 17 come into contact ( Figure 5 (d) ). At this stage of the assembly, the lugs 5 have not yet reached the point P and the middle-bezel 1 and the bottom 2 can not be brought closer together axially because the contact surfaces 17, 18 are rigid. The rotation of the middle part-bezel 1 with respect to the bottom 2 then causes an elastic deformation of the tongues 9 allowing the lugs 5 to pass the point P and to enter the bottom 8 of the grooves 3 (FIG. figure 5 (e) ). To ensure that the elastic limit of the tongues 9 will not be exceeded, one can arrange the middle-bezel 1 so that the zone of the free end 11 of the tongues 9, more precisely the boss 13a, abuts against a shoulder internal 25 of the middle-bezel 1 at the moment when the lugs 5 arrive at the point P. The final elastic deformation of the tongues 9 allowing the passage of the lugs 5 in the bottom 8 is then in their central part. The bumps 13a make it possible to define well defined support zones between the tongues 9 and the shoulder 25. Once the lugs 5 have completely passed the point P and are in the bottom 8 of the grooves 3, the tongues 9 return to their rest position and lock thus the pins 5 in position ( Figure 5 (f) ). The height of the second portion 15 of the inner surface 12 of the tongues 9 is chosen so that the surface 18 and the shoulder 17 are kept in contact or almost in contact when the lugs 5 are in the bottom 8 of the grooves 3. Thus, in their assembled state, the middle-bezel 1 and the bottom 2 leave no day between them and the seal 20 is not visible from the outside, which contributes to the aesthetics of the box. In addition, the contact between the surface 18 and the shoulder 17 ensures that the seal 20 is in a determined compressed state, considered sufficient for a good seal of the box.

Un tel assemblage de la carrure-lunette 1 et du fond 2 est réversible. Ces deux pièces 1, 2 peuvent en effet être désassemblées en tournant la carrure-lunette 1 par rapport au fond 2 dans le sens inverse de celui ayant permis l'assemblage. Toutefois, grâce à la partie intermédiaire inclinée 16 de la surface intérieure 12 des languettes 9, de pente plus raide que la première partie 14, l'effort à fournir pour faire sortir les ergots 5 du fond 8 des rainures 3 est plus important que celui nécessaire pour faire entrer les ergots 5 dans ledit fond 8. De la sorte, un assemblage fiable est obtenu. On notera également que la friction exercée par le joint 20 contribue à maintenir les ergots 5 dans leur position verrouillée.Such an assembly of the middle-bezel 1 and the bottom 2 is reversible. These two parts 1, 2 can indeed be disassembled by turning the middle-bezel 1 with respect to the bottom 2 in the opposite direction to that which allowed the assembly. However, thanks to the inclined intermediate portion 16 of the inner surface 12 of the tongues 9, with a steeper slope than the first portion 14, the force required to make the lugs 5 of the bottom 8 of the grooves 3 come out greater than the one necessary to enter the lugs 5 in said bottom 8. In this way, a reliable assembly is obtained. It will also be noted that the friction exerted by the seal 20 contributes to keeping the lugs 5 in their locked position.

L'assemblage selon l'invention est très précis en ce sens qu'une fois verrouillés dans le fond 8 des rainures 3, les ergots 5 définissent une position angulaire relative bien déterminée pour la carrure-lunette 1 et le fond 2. Ainsi, si le fond 2 présente un décor, on peut garantir qu'il sera correctement positionné par rapport à la carrure-lunette 1 et à ses cornes notamment.The assembly according to the invention is very precise in that once locked in the bottom 8 of the grooves 3, the lugs 5 define a relative angular position determined for the middle-bezel 1 and the bottom 2. Thus, if the bottom 2 has a decor, it can be guaranteed that it will be correctly positioned relative to the middle-bezel 1 and its horns in particular.

Dans l'exemple illustré aux figures 1 à 5, le joint d'étanchéité 20 est agencé pour se comprimer axialement (parallèlement à l'axe A). Dans une variante, le joint peut être agencé pour se comprimer radialement. La figure 6 montre une telle variante, avec le joint, désigné par le repère 21, logé dans une gorge 22 pratiquée dans une surface latérale extérieure du fond et une paroi 23 de la carrure-lunette venant comprimer le joint 21 lors de l'assemblage jusqu'à arriver en butée contre un épaulement 24 du fond.In the example shown in Figures 1 to 5 , the seal 20 is arranged to compress axially (parallel to the axis A). Alternatively, the seal may be arranged to compress radially. The figure 6 shows such variant, with the seal, designated by the reference 21, housed in a groove 22 formed in an outer side surface of the bottom and a wall 23 of the middle-bezel to compress the seal 21 during assembly until it stops against a shoulder 24 of the bottom.

Il va de soi que le principe d'assemblage tel que décrit ci-dessus pourrait être utilisé pour assembler d'autres pièces d'une boîte de montre, par exemple pour fixer une lunette à une carrure.It goes without saying that the assembly principle as described above could be used to assemble other parts of a watch case, for example to attach a bezel to a caseband.

Claims (10)

  1. Watch case comprising first and second pieces (1, 2) assembled by a bayonet link, the bayonet link comprising at least one lug (5) defined by the first piece (1) and at least one groove (3) defined by the second piece (2), the groove (3) defining a strip (9) and comprising a bottom (8) and an entrance (6) by which, during the assembling of the first and second pieces (1, 2), the lug (5) can be engaged into the groove (3) in parallel to a determined axis (A), wherein the lug (5) can then be moved toward the bottom (8) by relatively rotating the first and second pieces (1, 2) around the determined axis (A) and in a determined direction, the strip (9) comprising an inner face (12) comprising an inclined, first portion (14) extending toward the bottom (8) as far as a determined point (P) and a second portion (15) located in the bottom (8), beyond the determined point (P), wherein the first and second pieces (1, 2) further comprise respective rigid surfaces (18, 17) facing each other in the direction of the determined axis (A), characterised in that the second portion (15) of the inner face (12) of the strip (9) is recessed with respect to a plane (P2) that is perpendicular to the determined axis (A) and that passes through the determined point (P), and in that the first and second pieces (1, 2) are arranged so that when, during their assembling, they rest against each other in the direction of the determined axis (A) by a contact between the rigid surfaces (18, 17) and the lug (5) is in the groove (3), relatively rotating the first and second pieces (1, 2) around the determined axis (A) and in the determined direction causes the lug (9) to be elastically deformed by a cooperation between the lug (5) and the first portion (14) of the inner face (12) of the strip (9), wherein the strip (9) returns to its rest position once the lug (5) is in the bottom (8) of the groove (3) to lock the lug (5) in position.
  2. Watch case according to claim 1, characterised in that between the determined point (P) and the second portion (15) of the inner surface (12) of the strip (9) is an inclined portion (16) having a steeper slope than said first portion (14), whereby the torque to be applied to move the lug (5) out of the bottom (8) of the groove (3) is larger than the torque to be applied to move the lug (5) into said bottom (8) of the groove (3).
  3. Watch case according to claim 1 or 2, characterised in that the strip (9) comprises a free end (11) arranged to come to rest against the first piece (1) as the strip (9) is being deformed in order to prevent the strip (9) from exceeding its elastic limit.
  4. Watch case according to any one of claims 1 to 3, characterised by further comprising a seal (20; 21) between the first and second pieces (1, 2).
  5. Watch case according to claim 4, characterised in that the seal (20) is compressed in the direction of the determined axis (A).
  6. Watch case according to claim 4, characterised in that the seal (21) is compressed radially with respect to the determined axis (A).
  7. Watch case according to any one of claims 1 to 6, characterised in that the bayonet link comprises several said lugs (5) and respective several said grooves (3).
  8. Watch case according to claim 7, characterised in that the lugs (5), respectively the grooves (3), are equally spaced around the determined axis (A).
  9. Watch case according to any one of claims 1 to 8, characterised in that one of the first and second pieces (1, 2) comprises a middle (1) and the other of the first and second pieces comprises a case back (2).
  10. Watch case according to claim 9, characterised in that the piece comprising the middle (1) is said first piece and the piece comprising the case back (2) is said second piece.
EP13193034.9A 2013-11-15 2013-11-15 Watch case including a bayonet connection Active EP2874022B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP13193034.9A EP2874022B1 (en) 2013-11-15 2013-11-15 Watch case including a bayonet connection
JP2016553746A JP6459009B2 (en) 2013-11-15 2014-11-06 Watch case with bayonet coupling
PCT/IB2014/002361 WO2015071719A2 (en) 2013-11-15 2014-11-06 Watch case comprising a bayonet connection
CN201480051907.9A CN105814497B (en) 2013-11-15 2014-11-06 Watchcase including bayonet connection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13193034.9A EP2874022B1 (en) 2013-11-15 2013-11-15 Watch case including a bayonet connection

Publications (2)

Publication Number Publication Date
EP2874022A1 EP2874022A1 (en) 2015-05-20
EP2874022B1 true EP2874022B1 (en) 2016-10-26

Family

ID=49578216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13193034.9A Active EP2874022B1 (en) 2013-11-15 2013-11-15 Watch case including a bayonet connection

Country Status (4)

Country Link
EP (1) EP2874022B1 (en)
JP (1) JP6459009B2 (en)
CN (1) CN105814497B (en)
WO (1) WO2015071719A2 (en)

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US11803158B2 (en) 2017-12-15 2023-10-31 The Swatch Group Research And Development Ltd Closing/opening system for a timepiece case

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CN106164785B (en) * 2014-03-25 2018-10-02 Eta瑞士钟表制造股份有限公司 Clock and watch equipped with dial plate and relevant fastening method
EP3276433B1 (en) * 2016-07-26 2019-05-15 Omega SA Casing subassembly for a timepiece, watch or jewel
TWI653518B (en) * 2017-01-25 2019-03-11 郭俊良 Watch structure with double-sided surface and method for surface disassembly
FR3062218B1 (en) * 2017-01-25 2020-11-27 G&G Concept "CAPSLOCK" WATCH FASTENING
KR101928238B1 (en) * 2017-09-22 2018-12-11 성상언 Assemblable Smart Watch
CN108572546B (en) * 2018-05-11 2021-04-06 歌尔科技有限公司 Intelligent wearable device and screen accommodating device thereof
EP3608730B1 (en) * 2018-08-08 2021-05-05 Omega SA Annular rotating bezel system comprising a spring ring provided with at least two lugs
EP3958067A1 (en) 2020-08-17 2022-02-23 The Swatch Group Research and Development Ltd Device for attaching a bottom on a middle for a clockpiece
EP4163738B1 (en) 2021-10-08 2024-03-20 Louis Lang S.A. Watch case with a bayonet connection
EP4194967A1 (en) 2021-12-07 2023-06-14 The Swatch Group Research and Development Ltd Device for attaching a bottom on a middle for a timepiece

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EP1760556A1 (en) * 2005-09-06 2007-03-07 The Swatch Group Management Services AG Device for fixing a watch back cover onto the middle of the watch case

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US11803158B2 (en) 2017-12-15 2023-10-31 The Swatch Group Research And Development Ltd Closing/opening system for a timepiece case

Also Published As

Publication number Publication date
WO2015071719A3 (en) 2015-08-13
JP6459009B2 (en) 2019-01-30
JP2017507333A (en) 2017-03-16
CN105814497A (en) 2016-07-27
CN105814497B (en) 2018-05-08
WO2015071719A2 (en) 2015-05-21
EP2874022A1 (en) 2015-05-20

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