EP3293587B1 - Watch glass - Google Patents

Watch glass Download PDF

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Publication number
EP3293587B1
EP3293587B1 EP16187992.9A EP16187992A EP3293587B1 EP 3293587 B1 EP3293587 B1 EP 3293587B1 EP 16187992 A EP16187992 A EP 16187992A EP 3293587 B1 EP3293587 B1 EP 3293587B1
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EP
European Patent Office
Prior art keywords
watch
skirt
watch glass
glass
horizontal
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
EP16187992.9A
Other languages
German (de)
French (fr)
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EP3293587A1 (en
Inventor
Gregory Schmidt
Frank Vernay
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.)
Montres Tudor SA
Original Assignee
Montres Tudor SA
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 Montres Tudor SA filed Critical Montres Tudor SA
Priority to EP16187992.9A priority Critical patent/EP3293587B1/en
Priority to US15/698,260 priority patent/US10466651B2/en
Priority to JP2017171703A priority patent/JP7051340B2/en
Priority to CN201710806444.8A priority patent/CN107807510B/en
Publication of EP3293587A1 publication Critical patent/EP3293587A1/en
Application granted granted Critical
Publication of EP3293587B1 publication Critical patent/EP3293587B1/en
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Anticipated expiration legal-status Critical

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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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/004—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass
    • G04B39/006—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass out of wear resistant material, e.g. sapphire
    • 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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/02—Sealing crystals or glasses
    • G04B39/025—Sealing crystals or glasses without special sealing parts
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/06—Devices for shaping or setting watch glasses
    • 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

Definitions

  • the invention relates to a watch crystal. It also relates to a watch case and a timepiece as such comprising such a watch crystal.
  • the document CH310556 describes a state-of-the-art watch case, comprising a monobloc watch crystal. This solution requires the use of a relatively elastic material and is not compatible with more resistant materials such as sapphire.
  • the document CH505414 describes a watch crystal, which comprises a first element made of a first material ("mineral glass”) and a second element made of a second material (organic glass) different from the first, more elastic than the first material, the second element comprising a skirt in its lower part, and the two elements being fixed together so that the first element is intended for an outward orientation of a watch and in that the skirt of the second element is suitable for assembling the crystal watch on a watch case.
  • a watch crystal which comprises a first element made of a first material (“mineral glass”) and a second element made of a second material (organic glass) different from the first, more elastic than the first material, the second element comprising a skirt in its lower part, and the two elements being fixed together so that the first element is intended for an outward orientation of a watch and in that the skirt of the second element is suitable for assembling the crystal watch on a watch case.
  • the object of the present invention is to provide an improved solution for watch glass, and in particular to achieve all or part of the objects below.
  • a first object of the invention is to provide a particularly resistant watch crystal, in particular to scratches.
  • a second object of the invention is to provide a watch crystal, the assembly of which on a watch case is simple, and makes it possible to achieve an appropriate seal.
  • a third object of the invention is to provide a particularly aesthetic watch crystal.
  • the invention is based on a watch crystal according to claim 1.
  • the figure 1 shows a watch crystal 1 according to a first embodiment of the invention.
  • the watch crystal comprises a first element 2, made of a first rigid material, in particular of a first transparent rigid material, preferably made of sapphire, intended for an outward orientation of a watch middle. It further comprises a second element 3 made of a second more elastic material, in particular a second more elastic transparent material, in particular a polymer material, fixed to the first element 2.
  • the watch glass 1 preferably has symmetry about an axis. A of revolution.
  • the first element 2 of the watch glass 1 is substantially in the form of a disc, of axis A of revolution, the upper surface of which is slightly curved, and in particular has a convex geometry.
  • the second element 3 comprises a first upper part 3a in the form of a disc of diameter substantially equal to that of the disc formed by the first element 2, allowing the fixing of its upper surface over the entire lower surface 2a of the first element 2, or alternatively over only part of this surface.
  • the second element 3 comprises a second part, forming a skirt 3b, being in the form of an extension or of a substantially vertical wall extending downwards from the entire periphery of the second element 3, at the level of its periphery, of substantially annular horizontal section, of axis A.
  • the skirt 3b has a substantially cylindrical shape of axis A according to the first embodiment.
  • the first part 3a fulfills the function of fixing the first element 2 and the skirt 3b the function of assembly with a middle part of a watch, as will be developed below.
  • the figure 2 illustrates the watch glass 1, according to the first embodiment, assembled on a watch middle part 4.
  • the assembly process will be more particularly illustrated with reference to the figures 3 and 4 below.
  • the middle part 4 has an upwardly oriented vertical extension 4b, the substantially vertical exterior surface of which comes into contact with the interior surface of the skirt 3b of the second element 3 of the watch crystal 1.
  • a bezel 5 surrounds this assembly, comprises a first lower horizontal surface 5a, which rests on a horizontal surface 4a of the middle part of the watch 4, and a second surface 5b, substantially vertical, which comes into contact with the external surface of the skirt 3b.
  • the arrangement of the various components is such that the skirt 3b of the watch glass 1 is thus compressed radially against the middle part 4 by the bezel 5, guaranteeing the maintenance of the watch glass 1 on a watch case and sealing from the watch case.
  • this assembly solution has the advantage of great simplicity, does not require a specific seal. It also makes it possible to achieve a very aesthetic result.
  • the first element 2 is oriented towards the outside of the watch.
  • the skirt 3b extends in a direction opposite to the first element 2.
  • the first element 2 fulfills a first function of impact and scratch resistance and a second aesthetic function.
  • the second element 3 mainly fulfills the assembly function on a watch middle part, and possibly participates in the aesthetic effect, as will be illustrated below. It must therefore be in a sufficiently rigid material to guarantee the resistance of maintaining the watch crystal and withstand the stresses after its mounting, while having a sufficient elastic property to allow the assembly of its skirt while ensuring sealing, which notably implies bending stresses.
  • the first and second materials are thus necessarily different, the second being less rigid and more elastic than the first.
  • the second material is advantageously made of polymer, advantageously of polymethyl methacrylate (PMMA), a material which meets the above-mentioned constraints while having the advantage of very high optical transparency and excellent resistance to ultraviolet rays.
  • the second material used could be any other amorphous polymer such as polycarbonate (PC), polystyrene (PS), acrylonitrile butadiene styrene (ABS), polyvinyl chloride (PVC), polyethylene terephthalate ( PET), polycarbonate / polyethylene terephthalate (PC / PET), or polyurethanes (PU or PUR) ...
  • the fixing of the two elements 2, 3 of the watch crystal 1 is obtained by bonding, in particular by ultraviolet bonding.
  • bonding in particular by ultraviolet bonding.
  • this contact surface corresponds substantially to the entire lower surface 2a of the first element 2 (and therefore the entire upper surface of the second element 3), which maximizes the holding of the first element 2 on the second element, then indirectly on a watch case, while having the advantage of a laminated glass structure, which improves the overall resistance, in particular useful in the event of an extremely violent impact which would risk breaking the first element 2.
  • the two elements 2, 3 are thus fixed to each other, and superimposed in a vertical direction.
  • the second element 3 could be overmolded on the first element 2, in particular the skirt 3b of the element 3 could be overmolded on the lower surface of the element 2 and / or on a side wall of the element 2 .
  • the figures 3 and 4 illustrate the phases of assembling a watch crystal as illustrated on the figure 1 according to the first variant of the first embodiment of the invention on a middle part of a watch 4.
  • the skirt 3b of the second element 3 of the watch crystal 1 does not have a perfectly cylindrical shape of axis A , but has a section through a vertical plane of frustoconical shape. More specifically, in the variant shown and visible on the figure 3 , where the skirt 3b occupies its natural position of rest, the inner surface 31b of the skirt 3b is substantially vertical, parallel to the axis A of the watch glass 1, while its outer surface 32b is slightly inclined outward , so that the thickness of the skirt 3b increases regularly by moving towards its lower end.
  • this inclination of an angle a is slight, of the order of 3 degrees, between 0 and 10 degrees inclusive, or even between 2 and 4 degrees inclusive, relative to the vertical direction.
  • the vertical extension 4b upwards of the middle part of the watch 4 has an outer surface 42b of the same slightly inclined, substantially the same angle as the angle a of orientation of the surface 32b, of orientation different complementary, that is to say that the outer surface 42b moves outwardly moving upward.
  • the figure 3 represents an initial phase of a process for assembling a watch crystal 1 according to the invention on a watch middle 4.
  • the watch crystal 1 has been positioned in abutment on the watch middle 4, so that the horizontal lower surface of the skirt 3b is in abutment on a horizontal surface for receiving the middle part of the watch 4, substantially at the base of the extension vertical 4b of the watch middle part 4.
  • a bezel 5 is approached from above, in a vertical direction, around the outer surface of the watch glass 1. This bezel 5 is then gradually lowered to its final position represented by the figure 4 , in which the watch crystal 1 is finally mounted on the watch middle part 4.
  • the lower end of the vertical inner wall 5b of the telescope 5 has a chamfer.
  • the inner wall 5b can have a substantially frustoconical shape.
  • This inner surface 5b descends in abutment on the outer surface of the watch crystal 1, then pushes the skirt 3b because of its frustoconical conformation and its outer surface 32b inclined outward.
  • This skirt 3b is thus compressed inwards, and is slightly deformed in bending inwards thanks to its elastic property, due to the second material used and its shape.
  • its outer surface 32b follows the shape of the vertical inner surface 5b of the bezel 5.
  • the inner surface 31b of the skirt 3b thus becomes inclined at an angle a.
  • This inclination corresponds exactly or substantially to that of the outer surface 42b of the middle part 4 of the watch, so that these two corresponding surfaces 31b, 42b are held in abutment over their entire surface by the bezel 5.
  • the vertical extension 4b may possibly have an elasticity so as to guarantee the support of the surfaces 31b, 42b.
  • the figure 5 illustrates a watch crystal 1 according to a second variant of the first embodiment of the invention, mounted on a watch middle part 4.
  • the skirt 3b comprises a zone of least resistance 300b, which is in the form of 'A zone of smaller section positioned in the upper part of the skirt 3b.
  • This area of least resistance 300b has the effect of promoting the bending of the skirt 3b during assembly, by minimizing the internal stresses in the material of the skirt, allowing it to remain more easily in the mechanical characteristics of the second material used for the second element 3.
  • the figure 6 illustrates the same view as the figure 2 with a watch crystal according to a third variant embodiment of the invention.
  • the first disc-shaped part 3a of the second element 3 comprises a recess 30a in its horizontal upper surface, provided for housing a decoration element 6.
  • a decoration element 6 may for example consist of a precious or semi-precious stone. It can also consist of an element, display or not, coated with luminescent material. It is visible from the outside due to the transparency of the first element 2 of the watch crystal. Its positioning between the two elements 2, 3 of the watch glass, in "sandwich", allows it to be perfectly maintained and protected from external aggressions.
  • a recess can also be provided on the horizontal upper face of the second element 3 so as to constitute an adhesive reservoir, in particular for the purpose of containing the excess adhesive deposited during the bonding of the elements 2 and 3.
  • the recess 30a is arranged in such a way that it is not visible to the wearer, for example on the periphery of the middle part, in particular at the height of the middle part.
  • the upper surface of the first part 3a of the second element 3 may include a decoration, which may consist of all or part of the elements of the following group: surface texturing, all patterns in relief, surface metallization, color surface printing, etc.
  • a decoration which may consist of all or part of the elements of the following group: surface texturing, all patterns in relief, surface metallization, color surface printing, etc.
  • These approaches can generate decorative patterns, patterns which can consist of any decorative design and / or any particular indication.
  • These approaches can also generate functional patterns, such as for example surface textures reproducing lenses, in particular Fresnel lenses.
  • the first element 2 superimposed on at least one such pattern makes it possible to protect it from external aggressions such as shocks and to guarantee its durability.
  • the Figures 7 and 8 illustrate a second embodiment of the invention.
  • the figure 7 shows a watch glass 1 according to this second embodiment mounted on a watch middle 4.
  • the watch glass 1 differs from that of the first embodiment in that the first part 3a of the second element 3 does not extend over the entire lower surface of the first element 2. It extends from the outer end of the first element 2, over a distance representing approximately one third of the radius of the disc forming the first element 2. More generally, this part 3a can be extend over only part of the length of the lower surface 2a of the first element 2, whatever its shape.
  • This length preferably represents at least one fifth of the total length of the lower surface 2a of the first element 2. This length can moreover represent at most half of the total length of the lower surface 2a of the first element 2.
  • this lower surface 2a is delimited by a step arranged at the inner end of part 3a, so that the central zone of the first element 2 is lower than the external zone of the first element 2, of a thickness of the order of the first part 3a of the second element: thus, the watch glass 1 retains a substantially continuous and substantially planar, horizontal bottom surface.
  • the skirt 3b retains the same characteristics as in the first embodiment.
  • the first part 3a of the second element 3 forms a substantially horizontal ring.
  • the invention is not limited to the illustrated embodiments.
  • it is not limited to a watch glass with a circular outline, but can be adapted to any shape to correspond to any shape of watch case, for example rectangular or of the "barrel" type.
  • the upper surface of the watch glass can be flat or convex.
  • the lower surface of the watch glass can be flat or convex.
  • Watch glass could include more than two elements. It could in particular comprise at least one decorative element 6 as proposed within the third variant of the first embodiment of the invention. It could also include an external element, for example a magnifying glass favoring the reading of a time indication or derived from the time.
  • the external element is in the rigid material mentioned, in particular in sapphire.
  • the invention also relates to a watch case comprising a watch crystal as described above, and to a timepiece comprising such a watch case.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Electric Clocks (AREA)

Description

L'invention concerne une glace de montre. Elle concerne aussi une boîte de montre et une pièce d'horlogerie en tant que telles comprenant une telle glace de montre.The invention relates to a watch crystal. It also relates to a watch case and a timepiece as such comprising such a watch crystal.

Le document CH310556 décrit une boîte de montre de l'état de la technique, comprenant une glace de montre monobloc. Cette solution nécessite l'utilisation d'un matériau relativement élastique et n'est pas compatible avec les matériaux plus résistants comme le saphir.The document CH310556 describes a state-of-the-art watch case, comprising a monobloc watch crystal. This solution requires the use of a relatively elastic material and is not compatible with more resistant materials such as sapphire.

Le document CH505414 décrit une glace de montre, qui comprend un premier élément en un premier matériau ("verre minéral") et un deuxième élément en un deuxième matériau (verre organique) différent du premier, plus élastique que le premier matériau, le deuxième élément comprenant une jupe dans sa partie inférieure, et les deux éléments étant fixés entre eux de sorte que le premier élément soit destiné à une orientation vers l'extérieur d'une montre et en ce que la jupe du deuxième élément soit adaptée pour l'assemblage de la glace de montre sur une carrure de montre.The document CH505414 describes a watch crystal, which comprises a first element made of a first material ("mineral glass") and a second element made of a second material (organic glass) different from the first, more elastic than the first material, the second element comprising a skirt in its lower part, and the two elements being fixed together so that the first element is intended for an outward orientation of a watch and in that the skirt of the second element is suitable for assembling the crystal watch on a watch case.

La présente invention a pour objet de proposer une solution améliorée de glace de montre, et notamment d'atteindre tout ou partie des objets ci-dessous.
Un premier objet de l'invention est de proposer une glace de montre particulièrement résistante, notamment aux rayures.
Un deuxième objet de l'invention est de proposer une glace de montre dont l'assemblage sur une boîte de montre est simple, et permet d'atteindre une étanchéité appropriée.
Un troisième objet de l'invention est de proposer une glace de montre particulièrement esthétique.The object of the present invention is to provide an improved solution for watch glass, and in particular to achieve all or part of the objects below.
A first object of the invention is to provide a particularly resistant watch crystal, in particular to scratches.
A second object of the invention is to provide a watch crystal, the assembly of which on a watch case is simple, and makes it possible to achieve an appropriate seal.
A third object of the invention is to provide a particularly aesthetic watch crystal.

A cet effet, l'invention repose sur une glace de montre selon la revendication 1.To this end, the invention is based on a watch crystal according to claim 1.

L'invention est plus précisément définie par les revendications.The invention is more precisely defined by the claims.

Ces objets, caractéristiques et avantages de la présente invention seront exposés en détail dans la description suivante de modes de réalisation particuliers faits à titre non-limitatif en relation avec les figures jointes parmi lesquelles :

  • La figure 1 représente une vue en coupe par un plan médian transverse d'une glace de montre selon une première variante d'un premier mode de réalisation de l'invention.
  • La figure 2 représente une vue en coupe transverse de la glace de montre selon la première variante du premier mode de réalisation de l'invention montée sur une carrure de montre.
  • Les figures 3 et 4 représentent des vues en coupe transverse du procédé d'assemblage d'une glace de montre selon la première variante du premier mode de réalisation de l'invention sur une carrure de montre.
  • La figure 5 représente une vue en coupe transverse de l'assemblage d'une deuxième variante d'une glace de montre selon le premier mode de réalisation de l'invention sur une carrure de montre.
  • La figure 6 représente une vue en coupe transverse d'une glace de montre selon une troisième variante du premier mode de réalisation de l'invention montée sur une carrure de montre.
  • La figure 7 représente une vue en coupe transverse d'une glace de montre selon un deuxième mode de réalisation de l'invention sur une carrure de montre.
  • La figure 8 représente une vue de dessus de la glace de montre selon le deuxième mode de réalisation de l'invention.
These objects, characteristics and advantages of the present invention will be explained in detail in the following description of particular embodiments made without limitation in relation to the attached figures, among which:
  • The figure 1 shows a sectional view through a transverse median plane of a watch crystal according to a first variant of a first embodiment of the invention.
  • The figure 2 shows a cross-sectional view of the watch crystal according to the first variant of the first embodiment of the invention mounted on a watch middle.
  • The figures 3 and 4 show views in cross section of the method of assembling a watch crystal according to the first variant of the first embodiment of the invention on a watch middle.
  • The figure 5 shows a cross-sectional view of the assembly of a second variant of a watch crystal according to the first embodiment of the invention on a watch middle.
  • The figure 6 shows a cross-sectional view of a watch crystal according to a third variant of the first embodiment of the invention mounted on a watch middle.
  • The figure 7 shows a cross-sectional view of a watch crystal according to a second embodiment of the invention on a watch middle.
  • The figure 8 shows a top view of the watch crystal according to the second embodiment of the invention.

La figure 1 représente une glace de montre 1 selon un premier mode de réalisation de l'invention. La glace de montre comprend un premier élément 2, en un premier matériau rigide, en particulier en un premier matériau rigide transparent, de préférence en saphir, destiné à une orientation vers l'extérieur d'une carrure de montre. Elle comprend de plus un deuxième élément 3 en un deuxième matériau plus élastique, en particulier en un deuxième matériau transparent plus élastique, notamment un matériau polymère, fixé au premier élément 2. La glace de montre 1 présente préférentiellement une symétrie autour d'un axe A de révolution.The figure 1 shows a watch crystal 1 according to a first embodiment of the invention. The watch crystal comprises a first element 2, made of a first rigid material, in particular of a first transparent rigid material, preferably made of sapphire, intended for an outward orientation of a watch middle. It further comprises a second element 3 made of a second more elastic material, in particular a second more elastic transparent material, in particular a polymer material, fixed to the first element 2. The watch glass 1 preferably has symmetry about an axis. A of revolution.

Par convention, nous appellerons direction verticale z une direction parallèle à l'axe A de la glace de montre, notamment l'axe A de révolution de la glace de montre, et nous l'orienterons dans le sens du deuxième élément 3 vers le premier élément 2. Nous utiliserons ainsi les adjectifs « supérieur » et « inférieur » pour positionner différents éléments en considérant leur position selon cette direction verticale. En complément, les adjectifs « intérieur » et « extérieur » seront utilisés en référence à une boîte de montre sur laquelle est assemblée la glace de montre selon l'invention. Enfin, nous désignerons par direction horizontale toute direction perpendiculaire à la direction verticale. Les figures 1 à 7 illustrent des vues en coupe selon un plan médian transverse, comprenant l'axe A, de la glace de montre selon l'invention. Ces vues sont partielles ou non.By convention, we will call vertical direction z a direction parallel to the axis A of the watch glass, in particular the axis A of revolution of the watch glass, and we will orient it in the direction of the second element 3 towards the first element 2. We will thus use the adjectives “upper” and “lower” to position different elements by considering their position in this vertical direction. In addition, the adjectives “inside” and “outside” will be used with reference to a watch case on which the watch glass according to the invention is assembled. Finally, we will designate by horizontal direction any direction perpendicular to the vertical direction. The Figures 1 to 7 illustrate sectional views along a transverse median plane, comprising the axis A, of the watch crystal according to the invention. These views are partial or not.

Selon le premier mode de réalisation de la figure 1, le premier élément 2 de la glace de montre 1 se présente sensiblement sous une forme de disque, d'axe A de révolution, dont la surface supérieure est légèrement bombée, et présente notamment une géométrie convexe. Le deuxième élément 3 comprend une première partie 3a supérieure en forme de disque de diamètre sensiblement égal à celui du disque formé par le premier élément 2, permettant la fixation de sa surface supérieure sur toute la surface inférieure 2a du premier élément 2, ou en variante sur une partie seulement de cette surface. Enfin, le deuxième élément 3 comprend une deuxième partie, formant une jupe 3b, se présentant sous la forme d'une extension ou d'une paroi sensiblement verticale s'étendant vers le bas depuis tout le pourtour du deuxième élément 3, au niveau de sa périphérie, de section horizontale sensiblement annulaire, d'axe A. La jupe 3b a une forme sensiblement cylindrique d'axe A selon le premier mode de réalisation. La première partie 3a remplit la fonction de fixation du premier élément 2 et la jupe 3b la fonction d'assemblage avec une carrure de montre, comme cela va être développé ci-dessous.According to the first embodiment of the figure 1 , the first element 2 of the watch glass 1 is substantially in the form of a disc, of axis A of revolution, the upper surface of which is slightly curved, and in particular has a convex geometry. The second element 3 comprises a first upper part 3a in the form of a disc of diameter substantially equal to that of the disc formed by the first element 2, allowing the fixing of its upper surface over the entire lower surface 2a of the first element 2, or alternatively over only part of this surface. Finally, the second element 3 comprises a second part, forming a skirt 3b, being in the form of an extension or of a substantially vertical wall extending downwards from the entire periphery of the second element 3, at the level of its periphery, of substantially annular horizontal section, of axis A. The skirt 3b has a substantially cylindrical shape of axis A according to the first embodiment. The first part 3a fulfills the function of fixing the first element 2 and the skirt 3b the function of assembly with a middle part of a watch, as will be developed below.

En effet, la figure 2 illustre la glace de montre 1, selon le premier mode de réalisation, assemblée sur une carrure de montre 4. Le procédé d'assemblage sera plus particulièrement illustré en référence avec les figures 3 et 4 ci-après. En position assemblée, la carrure 4 présente une extension verticale 4b orientée vers le haut, dont la surface extérieure, sensiblement verticale, vient en contact avec la surface intérieure de la jupe 3b du deuxième élément 3 de la glace de montre 1. Une lunette 5 entoure cet ensemble, comprend une première surface 5a inférieure horizontale, qui repose sur une surface horizontale 4a de la carrure de montre 4, et une deuxième surface 5b, sensiblement verticale, qui vient en contact avec la surface extérieure de la jupe 3b. L'agencement des différents composants est tel que la jupe 3b de la glace de montre 1 se trouve ainsi compressée radialement contre la carrure 4 par la lunette 5, garantissant le maintien de la glace de montre 1 sur une boîte de montre et l'étanchéité de la boîte de montre. En remarque, cette solution d'assemblage présente l'avantage d'une grande simplicité, ne nécessite pas de joint d'étanchéité spécifique. Elle permet de plus d'atteindre un résultat très esthétique. En position finale, le premier élément 2 est orienté vers l'extérieur de la montre. La jupe 3b s'étend dans une direction opposée au premier élément 2.Indeed, the figure 2 illustrates the watch glass 1, according to the first embodiment, assembled on a watch middle part 4. The assembly process will be more particularly illustrated with reference to the figures 3 and 4 below. In the assembled position, the middle part 4 has an upwardly oriented vertical extension 4b, the substantially vertical exterior surface of which comes into contact with the interior surface of the skirt 3b of the second element 3 of the watch crystal 1. A bezel 5 surrounds this assembly, comprises a first lower horizontal surface 5a, which rests on a horizontal surface 4a of the middle part of the watch 4, and a second surface 5b, substantially vertical, which comes into contact with the external surface of the skirt 3b. The arrangement of the various components is such that the skirt 3b of the watch glass 1 is thus compressed radially against the middle part 4 by the bezel 5, guaranteeing the maintenance of the watch glass 1 on a watch case and sealing from the watch case. Note, this assembly solution has the advantage of great simplicity, does not require a specific seal. It also makes it possible to achieve a very aesthetic result. In the final position, the first element 2 is oriented towards the outside of the watch. The skirt 3b extends in a direction opposite to the first element 2.

Comme cela ressort de la description précédente, le premier élément 2 remplit une première fonction de résistance aux chocs et aux rayures et une deuxième fonction esthétique. Pour cela, il se trouve avantageusement dans un premier matériau très résistant et d'aspect esthétique attractif, de préférence en saphir. Le deuxième élément 3 remplit principalement la fonction d'assemblage sur une carrure de montre, et participe éventuellement à l'effet esthétique, comme cela sera illustré ci-après. Il doit donc se trouver dans un matériau suffisamment rigide pour garantir la résistance du maintien de la glace de montre et supporter les efforts après son montage, tout en possédant une propriété élastique suffisante pour permettre l'assemblage de sa jupe en assurant l'étanchéité, ce qui implique notamment des contraintes en flexion. Les premier et deuxième matériaux sont ainsi nécessairement différents, le deuxième étant moins rigide et plus élastique que le premier. Pour cela, le deuxième matériau se présente avantageusement en polymère, avantageusement en polyméthacrylate de méthyle (PMMA), matériau qui répond aux contraintes susmentionnées tout en présentant l'avantage d'une très grande transparence optique et d'une excellente tenue aux rayons ultraviolets. En variante, le deuxième matériau utilisé pourrait être tout autre polymère amorphe tel que le polycarbonate (PC), le polystyrène (PS), l'acrylonitrile butadiène styrène (ABS), le polychlorure de vinyle (PVC), le polytéréphtalate d'éthylène (PET), le polycarbonate / polytéréphtalate d'éthylène (PC/PET), ou encore les polyuréthanes (PU ou PUR)...As is apparent from the preceding description, the first element 2 fulfills a first function of impact and scratch resistance and a second aesthetic function. For this, it is advantageously in a first material which is very resistant and of attractive aesthetic appearance, preferably in sapphire. The second element 3 mainly fulfills the assembly function on a watch middle part, and possibly participates in the aesthetic effect, as will be illustrated below. It must therefore be in a sufficiently rigid material to guarantee the resistance of maintaining the watch crystal and withstand the stresses after its mounting, while having a sufficient elastic property to allow the assembly of its skirt while ensuring sealing, which notably implies bending stresses. The first and second materials are thus necessarily different, the second being less rigid and more elastic than the first. For this, the second material is advantageously made of polymer, advantageously of polymethyl methacrylate (PMMA), a material which meets the above-mentioned constraints while having the advantage of very high optical transparency and excellent resistance to ultraviolet rays. Alternatively, the second material used could be any other amorphous polymer such as polycarbonate (PC), polystyrene (PS), acrylonitrile butadiene styrene (ABS), polyvinyl chloride (PVC), polyethylene terephthalate ( PET), polycarbonate / polyethylene terephthalate (PC / PET), or polyurethanes (PU or PUR) ...

De plus, selon le mode de réalisation, la fixation des deux éléments 2, 3 de la glace de montre 1 est obtenue par un collage, notamment par un collage ultraviolet. Comme ils ont une grande surface de contact, leur collage sur cette surface permet d'obtenir une adhésion fiable et durable. Dans ce premier mode de réalisation, cette surface de contact correspond sensiblement à toute la surface inférieure 2a du premier élément 2 (et donc toute la surface supérieure du deuxième élément 3), ce qui maximise la tenue du premier élément 2 sur le deuxième élément, puis indirectement sur une boîte de montre, tout en présentant l'avantage d'une structure de glace feuilletée, qui améliore la résistance globale, notamment utile en cas de choc extrêmement violent qui risquerait de briser le premier élément 2. En variante, d'autres types de collage ou plus généralement de fixations, par exemple une fixation mécanique tel que le rivetage, notamment par le biais d'éléments connexes comme des rivets, pourraient être mis en oeuvre. Les deux éléments 2, 3 sont ainsi fixés l'un à l'autre, et superposés dans une direction verticale. En variante encore, le deuxième élément 3 pourrait être surmoulé sur le premier élément 2, notamment la jupe 3b de l'élément 3 pourrait être surmoulée sur la surface inférieure de l'élément 2 et/ou sur une paroi latérale de l'élément 2.In addition, according to the embodiment, the fixing of the two elements 2, 3 of the watch crystal 1 is obtained by bonding, in particular by ultraviolet bonding. As they have a large contact surface, their bonding on this surface makes it possible to obtain a reliable and durable adhesion. In this first embodiment, this contact surface corresponds substantially to the entire lower surface 2a of the first element 2 (and therefore the entire upper surface of the second element 3), which maximizes the holding of the first element 2 on the second element, then indirectly on a watch case, while having the advantage of a laminated glass structure, which improves the overall resistance, in particular useful in the event of an extremely violent impact which would risk breaking the first element 2. As a variant, other types of bonding or more generally of fasteners, for example a mechanical fastener such as riveting, in particular by means of related elements such as rivets, could be implemented. The two elements 2, 3 are thus fixed to each other, and superimposed in a vertical direction. In another variant, the second element 3 could be overmolded on the first element 2, in particular the skirt 3b of the element 3 could be overmolded on the lower surface of the element 2 and / or on a side wall of the element 2 .

Les figures 3 et 4 illustrent les phases d'assemblage d'une glace de montre telle qu'illustrée sur la figure 1 selon la première variante du premier mode de réalisation de l'invention sur une carrure de montre 4. Dans cette variante de réalisation, la jupe 3b du deuxième élément 3 de la glace de montre 1 ne présente pas de forme parfaitement cylindrique d'axe A, mais présente une section par un plan vertical de forme tronconique. Plus précisément, dans la variante représentée et visible sur la figure 3, où la jupe 3b occupe sa position naturelle de repos, la surface intérieure 31b de la jupe 3b est sensiblement verticale, parallèle à l'axe A de la glace de montre 1, alors que sa surface extérieure 32b est légèrement inclinée vers l'extérieur, de sorte que l'épaisseur de la jupe 3b augmente régulièrement en se déplaçant vers son extrémité inférieure. Avantageusement, cette inclinaison d'un angle a est légère, de l'ordre de 3 degrés, comprise entre 0 et 10 degrés inclus, voire comprise entre 2 et 4 degrés inclus, par rapport à la direction verticale. Dans cette variante de réalisation, l'extension verticale 4b vers le haut de la carrure de montre 4 présente une surface extérieure 42b de même légèrement inclinée, sensiblement de même angle que l'angle a d'orientation de la surface 32b, d'orientation différente complémentaire, c'est-à-dire que la surface extérieure 42b s'écarte vers l'extérieur en se déplaçant vers le haut.The figures 3 and 4 illustrate the phases of assembling a watch crystal as illustrated on the figure 1 according to the first variant of the first embodiment of the invention on a middle part of a watch 4. In this alternative embodiment, the skirt 3b of the second element 3 of the watch crystal 1 does not have a perfectly cylindrical shape of axis A , but has a section through a vertical plane of frustoconical shape. More specifically, in the variant shown and visible on the figure 3 , where the skirt 3b occupies its natural position of rest, the inner surface 31b of the skirt 3b is substantially vertical, parallel to the axis A of the watch glass 1, while its outer surface 32b is slightly inclined outward , so that the thickness of the skirt 3b increases regularly by moving towards its lower end. Advantageously, this inclination of an angle a is slight, of the order of 3 degrees, between 0 and 10 degrees inclusive, or even between 2 and 4 degrees inclusive, relative to the vertical direction. In this variant embodiment, the vertical extension 4b upwards of the middle part of the watch 4 has an outer surface 42b of the same slightly inclined, substantially the same angle as the angle a of orientation of the surface 32b, of orientation different complementary, that is to say that the outer surface 42b moves outwardly moving upward.

La figure 3 représente une phase initiale d'un procédé d'assemblage d'une glace de montre 1 selon l'invention sur une carrure de montre 4. La glace de montre 1 a été positionnée en butée sur la carrure de montre 4, de sorte que la surface inférieure horizontale de la jupe 3b soit en appui sur une surface horizontale de réception de la carrure de montre 4, sensiblement à la base de l'extension verticale 4b de la carrure de montre 4. Une lunette 5 est approchée par le haut, en direction verticale, autour de la surface extérieure de la glace de montre 1. Cette lunette 5 est ensuite descendue progressivement jusqu'à sa position finale représentée par la figure 4, dans laquelle la glace de montre 1 est finalement montée sur la carrure de montre 4.The figure 3 represents an initial phase of a process for assembling a watch crystal 1 according to the invention on a watch middle 4. The watch crystal 1 has been positioned in abutment on the watch middle 4, so that the horizontal lower surface of the skirt 3b is in abutment on a horizontal surface for receiving the middle part of the watch 4, substantially at the base of the extension vertical 4b of the watch middle part 4. A bezel 5 is approached from above, in a vertical direction, around the outer surface of the watch glass 1. This bezel 5 is then gradually lowered to its final position represented by the figure 4 , in which the watch crystal 1 is finally mounted on the watch middle part 4.

Pour faciliter la descente de la lunette 5 dans ce procédé d'assemblage, selon la direction F, l'extrémité inférieure de la paroi intérieure 5b verticale de la lunette 5 présente un chanfrein. Complémentairement, la paroi intérieure 5b peut présenter une forme sensiblement tronconique. Cette surface intérieure 5b descend en appui sur la surface extérieure de la glace de montre 1, puis vient repousser la jupe 3b du fait de sa conformation tronconique et de sa surface extérieure 32b inclinée vers l'extérieur. Cette jupe 3b est ainsi compressée vers l'intérieur, et se déforme légèrement en flexion vers l'intérieur grâce à sa propriété élastique, du fait du deuxième matériau utilisé et de sa forme. En position finale, sa surface extérieure 32b épouse la forme de la surface intérieure 5b verticale de la lunette 5. Dans cette position contrainte, la surface intérieure 31b de la jupe 3b devient ainsi inclinée selon un angle a. Cette inclinaison correspond exactement ou sensiblement à celle de la surface extérieure 42b de la carrure 4 de montre, de sorte que ces deux surfaces 31b, 42b correspondantes sont maintenues en appui sur toute leur surface par la lunette 5. L'extension verticale 4b peut éventuellement présenter une élasticité de façon à garantir l'appui des surfaces 31b, 42b. Cette configuration finale permet d'éviter tout arrachement accidentel de la glace de montre 1, tout en garantissant l'étanchéité de l'assemblage, même sans utilisation d'un joint d'assemblage. Il s'agit ainsi d'un montage à cran de la glace de montre 1 sur la carrure 4.To facilitate the descent of the telescope 5 in this assembly process, in the direction F, the lower end of the vertical inner wall 5b of the telescope 5 has a chamfer. Additionally, the inner wall 5b can have a substantially frustoconical shape. This inner surface 5b descends in abutment on the outer surface of the watch crystal 1, then pushes the skirt 3b because of its frustoconical conformation and its outer surface 32b inclined outward. This skirt 3b is thus compressed inwards, and is slightly deformed in bending inwards thanks to its elastic property, due to the second material used and its shape. In the final position, its outer surface 32b follows the shape of the vertical inner surface 5b of the bezel 5. In this constrained position, the inner surface 31b of the skirt 3b thus becomes inclined at an angle a. This inclination corresponds exactly or substantially to that of the outer surface 42b of the middle part 4 of the watch, so that these two corresponding surfaces 31b, 42b are held in abutment over their entire surface by the bezel 5. The vertical extension 4b may possibly have an elasticity so as to guarantee the support of the surfaces 31b, 42b. This final configuration makes it possible to avoid any accidental tearing of the watch glass 1, while guaranteeing the tightness of the assembly, even without the use of an assembly joint. It is thus a notched mounting of the watch crystal 1 on the middle part 4.

La figure 5 illustre une glace de montre 1 selon une deuxième variante du premier mode de réalisation de l'invention, montée sur une carrure de montre 4. Dans cette réalisation, la jupe 3b comprend une zone de moindre résistance 300b, qui se présente sous la forme d'une zone de plus faible section positionnée en partie supérieure de la jupe 3b. Cette zone de moindre résistance 300b a pour effet de favoriser la flexion de la jupe 3b lors de l'assemblage, en minimisant les contraintes internes dans le matériau de la jupe, permettant de rester plus facilement dans les caractéristiques mécaniques du deuxième matériau utilisé pour le deuxième élément 3.The figure 5 illustrates a watch crystal 1 according to a second variant of the first embodiment of the invention, mounted on a watch middle part 4. In this embodiment, the skirt 3b comprises a zone of least resistance 300b, which is in the form of 'A zone of smaller section positioned in the upper part of the skirt 3b. This area of least resistance 300b has the effect of promoting the bending of the skirt 3b during assembly, by minimizing the internal stresses in the material of the skirt, allowing it to remain more easily in the mechanical characteristics of the second material used for the second element 3.

La figure 6 illustre la même vue que la figure 2 avec une glace de montre selon une troisième variante de réalisation de l'invention. Dans cette variante, la première partie 3a en forme de disque du deuxième élément 3 comprend une creusure 30a dans sa surface supérieure horizontale, prévue pour le logement d'un élément de décoration 6. Un tel élément de décoration 6 peut par exemple consister en une pierre précieuse ou semi-précieuse. Il peut également consister en un élément, d'affichage ou non, revêtu de matière luminescente. Il est visible depuis l'extérieur du fait de la transparence du premier élément 2 de la glace de montre. Son positionnement entre les deux éléments 2, 3 de la glace de montre, en « sandwich », lui permet d'être parfaitement maintenu et protégé des agressions extérieures. En variante, une creusure peut également être prévue sur la face supérieure horizontale du deuxième élément 3 de façon à constituer un réservoir de colle, notamment dans le but de contenir le surplus de colle déposée lors du collage des éléments 2 et 3. Dans ce cas, la creusure 30a est disposée de telle sorte qu'elle n'est pas visible du porteur, par exemple sur le pourtour de la carrure, notamment au niveau du rehaut de la carrure.The figure 6 illustrates the same view as the figure 2 with a watch crystal according to a third variant embodiment of the invention. In this variant, the first disc-shaped part 3a of the second element 3 comprises a recess 30a in its horizontal upper surface, provided for housing a decoration element 6. Such a decoration element 6 may for example consist of a precious or semi-precious stone. It can also consist of an element, display or not, coated with luminescent material. It is visible from the outside due to the transparency of the first element 2 of the watch crystal. Its positioning between the two elements 2, 3 of the watch glass, in "sandwich", allows it to be perfectly maintained and protected from external aggressions. As a variant, a recess can also be provided on the horizontal upper face of the second element 3 so as to constitute an adhesive reservoir, in particular for the purpose of containing the excess adhesive deposited during the bonding of the elements 2 and 3. In this case , the recess 30a is arranged in such a way that it is not visible to the wearer, for example on the periphery of the middle part, in particular at the height of the middle part.

Alternativement, d'autres types de décoration peuvent être obtenus sans nécessairement réaliser une creusure du deuxième élément 3. Par exemple, ce deuxième élément 3 peut être au moins partiellement coloré. Une telle solution permet d'obtenir un résultat alternatif aux glaces en saphir de couleur. Selon un autre exemple, la surface supérieure de la première partie 3a du deuxième élément 3 peut comprendre une décoration, qui peut consister en tout ou partie des éléments du groupe suivant : une texturation de surface, tous motifs en reliefs, une métallisation de surface, une impression de surface en couleur, etc. Ces approches peuvent générer des motifs de décoration, motifs qui peuvent consister en tout dessin de décoration et/ou en toutes indications particulières. Ces approches peuvent également générer des motifs fonctionnels, comme par exemple des texturations de surface reproduisant des lentilles, en particulier des lentilles de Fresnel. Le premier élément 2 superposé à au moins un tel motif permet de le protéger des agressions extérieures comme les chocs et de garantir sa pérennité.Alternatively, other types of decoration can be obtained without necessarily making a hollow in the second element 3. For example, this second element 3 can be at least partially colored. Such a solution provides an alternative result to colored sapphire crystal. According to another example, the upper surface of the first part 3a of the second element 3 may include a decoration, which may consist of all or part of the elements of the following group: surface texturing, all patterns in relief, surface metallization, color surface printing, etc. These approaches can generate decorative patterns, patterns which can consist of any decorative design and / or any particular indication. These approaches can also generate functional patterns, such as for example surface textures reproducing lenses, in particular Fresnel lenses. The first element 2 superimposed on at least one such pattern makes it possible to protect it from external aggressions such as shocks and to guarantee its durability.

Naturellement, d'autres variantes de réalisation peuvent être obtenues par la simple combinaison des variantes de réalisation précédentes.Naturally, other alternative embodiments can be obtained by the simple combination of the preceding alternative embodiments.

Les figures 7 et 8 illustrent un deuxième mode de réalisation de l'invention. La figure 7 représente une glace de montre 1 selon ce deuxième mode de réalisation montée sur une carrure de montre 4. La glace de montre 1 se différencie de celle du premier mode de réalisation en ce que la première partie 3a du deuxième élément 3 ne s'étend pas sur toute la surface inférieure du premier élément 2. Elle s'étend depuis l'extrémité extérieure du premier élément 2, sur une distance représentant environ un tiers du rayon du disque formant le premier élément 2. Plus généralement, cette partie 3a peut s'étendre sur une partie seulement de la longueur de la surface inférieure 2a du premier élément 2, quelle que soit sa forme. Cette longueur représente de préférence au minimum un cinquième de la longueur totale de la surface inférieure 2a du premier élément 2. Cette longueur peut de plus représenter au maximum la moitié de la longueur totale de la surface inférieure 2a du premier élément 2. Préférentiellement, cette surface inférieure 2a est délimitée par une marche disposée au niveau de l'extrémité intérieure de la partie 3a, de sorte que la zone centrale du premier élément 2 est plus basse que la zone extérieure du premier élément 2, d'une épaisseur de l'ordre de la première partie 3a du deuxième élément : ainsi, la glace de montre 1 conserve une surface inférieure sensiblement continue et sensiblement plane, horizontale. La jupe 3b conserve les mêmes caractéristiques que dans le premier mode de réalisation. Comme cela est plus particulièrement visible sur les figures 7 et 8, la première partie 3a du deuxième élément 3 forme un anneau sensiblement horizontal.The Figures 7 and 8 illustrate a second embodiment of the invention. The figure 7 shows a watch glass 1 according to this second embodiment mounted on a watch middle 4. The watch glass 1 differs from that of the first embodiment in that the first part 3a of the second element 3 does not extend over the entire lower surface of the first element 2. It extends from the outer end of the first element 2, over a distance representing approximately one third of the radius of the disc forming the first element 2. More generally, this part 3a can be extend over only part of the length of the lower surface 2a of the first element 2, whatever its shape. This length preferably represents at least one fifth of the total length of the lower surface 2a of the first element 2. This length can moreover represent at most half of the total length of the lower surface 2a of the first element 2. Preferably, this lower surface 2a is delimited by a step arranged at the inner end of part 3a, so that the central zone of the first element 2 is lower than the external zone of the first element 2, of a thickness of the order of the first part 3a of the second element: thus, the watch glass 1 retains a substantially continuous and substantially planar, horizontal bottom surface. The skirt 3b retains the same characteristics as in the first embodiment. As is more particularly visible on the Figures 7 and 8 , the first part 3a of the second element 3 forms a substantially horizontal ring.

Toutes les variantes du premier mode de réalisation peuvent être reproduites sur ce deuxième mode de réalisation.All the variants of the first embodiment can be reproduced in this second embodiment.

Naturellement, l'invention ne se limite pas aux modes de réalisation illustrés. Particulièrement, elle n'est pas limitée à une glace de montre de contour circulaire, mais peut s'adapter à toute forme pour correspondre à toute forme de boîte de montre, par exemple rectangulaire ou de type « tonneau ». La surface supérieure de la glace de montre peut être plane ou convexe. La surface inférieure de la glace de montre peut être plane ou convexe. De plus, La glace de montre pourrait comprendre plus de deux éléments. Elle pourrait notamment comprendre au moins un élément de décoration 6 tel que proposé au sein de la troisième variante du premier mode de réalisation de l'invention. Elle pourrait par ailleurs comprendre un élément extérieur, par exemple une loupe favorisant la lecture d'une indication horaire ou dérivée de l'heure. Avantageusement, l'élément extérieur est dans le matériau rigide mentionné, notamment en saphir.Naturally, the invention is not limited to the illustrated embodiments. In particular, it is not limited to a watch glass with a circular outline, but can be adapted to any shape to correspond to any shape of watch case, for example rectangular or of the "barrel" type. The upper surface of the watch glass can be flat or convex. The lower surface of the watch glass can be flat or convex. In addition, Watch glass could include more than two elements. It could in particular comprise at least one decorative element 6 as proposed within the third variant of the first embodiment of the invention. It could also include an external element, for example a magnifying glass favoring the reading of a time indication or derived from the time. Advantageously, the external element is in the rigid material mentioned, in particular in sapphire.

Enfin, l'invention porte aussi sur une boîte de montre comprenant une glace de montre telle que décrite précédemment, et sur une pièce d'horlogerie comprenant une telle boîte de montre.Finally, the invention also relates to a watch case comprising a watch crystal as described above, and to a timepiece comprising such a watch case.

Claims (12)

  1. A watch glass (1) comprising a first element (2) made of a first material and a second element (3) made of a second material different from the first, more elastic than the first material, the second element (3) comprising a skirt (3b) in its lower part, characterized in that said skirt has a wall (32b) of frustoconical shape, and in that the two elements (2, 3) are fixed to each other so that the first element (2) is intended for an orientation toward the exterior of a watch and in that the skirt of the second element (3) is adapted for the assembly of the watch glass (1) to a watch middle (4).
  2. The watch glass as claimed in the preceding claim, characterized in that the first material is sapphire and the second material is a polymer, notably polymethyl methacrylate (PMMA).
  3. The watch glass as claimed in either one of the preceding claims, characterized in that the two elements (2, 3) are fixed together by gluing between at least two respective substantially horizontal surfaces.
  4. The watch glass as claimed in any one of the preceding claims, characterized in that the second element (3) includes a horizontal first part (3a), the upper surface of which is substantially the same size as the lower surface (2a) of the first element (2), which is therefore superposed on it over all its surface.
  5. The watch glass as claimed in any one of claims 1 to 3, characterized in that the second element (3) includes a horizontal first part (3a) the upper surface of which extends over a length comprised between one fifth and half inclusive the length of the lower surface (2a) of the first element (2), which is therefore partially superposed on it.
  6. The watch lens as claimed in any one of the preceding claims, characterized in that the skirt (3b) of the second element (3) takes the form of a substantially vertical extension that extends downward from all of the perimeter of the second element (3) at the level of its periphery.
  7. The watch glass as claimed in any one of the preceding claims, characterized in that the skirt (3b) includes an area (300b)of lower mechanical strength.
  8. The watch glass as claimed in any one of the preceding claims, characterized in that the upper surface of the second element (3) has some or all of the following features:
    - at least one recess (30a) in which is housed a decoration element (6), notably formed of precious or semi-precious stones, or an element coated with luminescent material;
    - at least one surface texture;
    - surface reliefs;
    - at least one surface metallization;
    - at least one surface printing.
  9. A watch case characterized in that it comprises a watch glass (1) as claimed in any one of the preceding claims.
  10. The watch case as claimed in the preceding claim, characterized in that it comprises a watch middle (4) that includes an upward vertical extension (4b) the exterior surface (42b) of which is in contact with an interior surface (31b) of the skirt (3b) of the second element (3) of the watch glass (1), and in that it comprises a bezel (5) that surrounds the watch glass (1), holding it pressed against the watch middle (4).
  11. The watch case as claimed in the preceding claim, characterized in that the skirt (3b) comprises a wall (32b) of frustoconical shape and in that the exterior surface (42b) of the watch middle (4) has an inclined surface substantially corresponding to the frustoconical shape of the skirt (3b).
  12. A timepiece, characterized in that it comprises a watch glass (1) as claimed in any one of claims 1 to 8 or a watch case as claimed in any one of claims 9 to 11.
EP16187992.9A 2016-09-09 2016-09-09 Watch glass Active EP3293587B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP16187992.9A EP3293587B1 (en) 2016-09-09 2016-09-09 Watch glass
US15/698,260 US10466651B2 (en) 2016-09-09 2017-09-07 Watch glass
JP2017171703A JP7051340B2 (en) 2016-09-09 2017-09-07 Small watch glass
CN201710806444.8A CN107807510B (en) 2016-09-09 2017-09-08 Watch glass

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16187992.9A EP3293587B1 (en) 2016-09-09 2016-09-09 Watch glass

Publications (2)

Publication Number Publication Date
EP3293587A1 EP3293587A1 (en) 2018-03-14
EP3293587B1 true EP3293587B1 (en) 2020-02-19

Family

ID=56893841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16187992.9A Active EP3293587B1 (en) 2016-09-09 2016-09-09 Watch glass

Country Status (4)

Country Link
US (1) US10466651B2 (en)
EP (1) EP3293587B1 (en)
JP (1) JP7051340B2 (en)
CN (1) CN107807510B (en)

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JPS5886591U (en) * 1981-12-04 1983-06-11 シチズン時計株式会社 Glass fixed structure
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JPS59143985A (en) * 1983-02-07 1984-08-17 Seiko Instr & Electronics Ltd Portable timepiece case
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JPS607089U (en) * 1983-06-28 1985-01-18 セイコーインスツルメンツ株式会社 Carbide waterproof side for mobile watches
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US8303169B2 (en) * 2011-01-21 2012-11-06 Bulltoro Watch Company, LLC Comfort watch
DE202012013052U1 (en) * 2011-02-23 2014-09-29 Schott Ag Sapphire glass disc with antireflection coating and its use
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Also Published As

Publication number Publication date
EP3293587A1 (en) 2018-03-14
JP2018081078A (en) 2018-05-24
US20180074460A1 (en) 2018-03-15
CN107807510B (en) 2021-03-09
US10466651B2 (en) 2019-11-05
JP7051340B2 (en) 2022-04-11
CN107807510A (en) 2018-03-16

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