EP2851755B1 - Watertight wrist-watch case - Google Patents

Watertight wrist-watch case Download PDF

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Publication number
EP2851755B1
EP2851755B1 EP14192782.2A EP14192782A EP2851755B1 EP 2851755 B1 EP2851755 B1 EP 2851755B1 EP 14192782 A EP14192782 A EP 14192782A EP 2851755 B1 EP2851755 B1 EP 2851755B1
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EP
European Patent Office
Prior art keywords
side wall
casing
watch case
case according
wrist watch
Prior art date
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EP14192782.2A
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German (de)
French (fr)
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EP2851755A3 (en
EP2851755A2 (en
Inventor
Jean-Louis Bertrand
William Passaquin
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Rolex SA
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Rolex SA
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Priority to EP14192782.2A priority Critical patent/EP2851755B1/en
Publication of EP2851755A2 publication Critical patent/EP2851755A2/en
Publication of EP2851755A3 publication Critical patent/EP2851755A3/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
    • G04B37/04—Mounting the clockwork in the case; Shock absorbing mountings
    • G04B37/05—Fixed mountings for pocket or wrist watches
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/084—Complete encasings for wrist or pocket watches without means for hermetic sealing of winding stem or crown
    • 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
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases

Definitions

  • the present invention relates to a waterproof wristwatch box comprising a protective envelope surrounded by a middle and a bezel.
  • a waterproof watch case intended for depths of more than 300 meters consisting of a caseband and a bottom made of a material that is less resistant than steel, which includes an inner bowl made of a material of high mechanical strength conforming to the internal face from the bottom and at least partly the inner wall of the middle-telescope and leaning by its edge against the side of a scope of the case-case against the side on which the ice rests.
  • This solution has two weak points that limit the depth that the sealed box can withstand.
  • the second weak point comes from the fact that the portion of the bowl that bears against the scope of the middle-bezel is cantilevered with respect to the wall of the bowl creating poor conditions of transmission of the compression force that s' exerts on the bowl.
  • the document CH 343 949 A discloses a watch case in which a side wall is made of plastic material and deforms.
  • the plastic elements are actually used as a seal and are deformable, so they do not form a compression-resistant structure.
  • the object of the present invention is to overcome the limitations of the solutions of the state of the art while limiting the increase in the thickness of a sealed wristwatch case, capable of withstanding a determined pressure.
  • the subject of the present invention is a sealed wristwatch box comprising a protective envelope surrounded by a caseband and a telescope.
  • the main advantage of this waterproof watch case is to be able to withstand pressures of several tens of MPa significantly reducing the thickness compared to watch cases of conventional design, which allows for a watch case capable of withstanding depths of several thousand meters, typically between 3000 and 5000 meters, and whose thickness still allows it to be worn on the wrist as a wristwatch.
  • the bezel and the caseband which do not contribute to the protection of the watch movement which is entirely protected by the protective envelope, can be made of materials traditionally used in the field of watch cases and which can range from plastic to platinum. passing through stainless steel, and different gold alloys.
  • Another advantage of the invention arises from the fact that the seal and the resistance to pressure are obtained by entirely distinct elements which do not influence at all one over the other.
  • the sealing members participate in the assembly of at least some of the elements of the protective envelope.
  • FIG. 1 a watch case according to the state of the art. This watch case was chosen because it is a waterproof wristwatch box market, tested at 1550 meters, which makes it a wristwatch that can withstand a great depth.
  • the wristwatch box object of the present invention and illustrated by the figure 2 comprises a completely closed protective envelope and which comprises, in this embodiment, a bottom 1 of a material having a Young's modulus sufficient to limit the deformation. It will be seen later that this Young's modulus must be> 100,000 MPa. This material must above all have a resistance to bending significantly higher than the two traditional materials of stainless steel and gold. In the illustrated example, this material could be a ceramic such as zirconia. This material could also be titanium which has in particular a high flexural strength and a Young's modulus> 100,000 MPa.
  • This bottom 1 has an arch-shaped profile that improves its resistance to bending. Its edge ends with a flat surface on which rests a side wall 2 made of a material whose compressive strength is substantially greater than that of stainless steel or gold. Since this side wall 2 must be drilled for the passage of the winding stem, it will prefer a metal alloy to a ceramic. It is possible to use an alloy such as a nickel-free steel of the Biodur 108 type whose properties are indicated in Table II.
  • This side wall 2 is delimited by two flat surfaces, one in contact with the surface 1a of the bottom 1, the other in contact with a flat surface 3a of the periphery of the glass 3, which is sapphire which has a module Young's strength and flexural strength as shown in Table I.
  • the protective envelope formed here by the bottom 1, the side wall 2 and the ice 3 comprises a compression-resistant structure SR with parallel side faces, perpendicular to the bearing surfaces between this side wall 2 and the bottom 1, of a part and between this side wall 2 and the ice 3, on the other hand and which extends, without a solution of continuity, to the bottom 1 of the envelope and includes at least a portion of the side wall 2 and the bottom 1 of the envelope.
  • This compression-resistant structure SR is delimited on the Figures 2 to 4 by two lines in phantom. As will be seen in Table III, resistance to the compression of this side wall 2 can be adapted by adjusting the radial thickness of the resistant structure SR.
  • the side wall 2 has an outer side wall 2a located in the extension of the lateral surface of the ice 3, the cross sections delimited by these side surfaces being constant. These two lateral surfaces are surrounded by an annular seal 4.
  • the base 4a of this seal 4 is compressed in the radial direction by a portion 5a of internal lateral surface of a middle part 5 surrounding the side wall 2 of the casing. protection.
  • An inner surface formed between the portion 5a of the inner lateral surface of the middle part 5 and the remainder of this lateral surface surrounding the side wall 2 abuts against an outer surface of this side wall 2.
  • the part of the middle 5 located on the bottom side 1 of the protective envelope has a thread for receiving a threaded ring 6 clamping between the middle 5 and the bottom 1.
  • a seal 7 is disposed between an outer surface of the bottom 1 and the base of the middle part 5.
  • the portion of the annular seal 4 which surrounds the lateral face of the lens 3 is compressed radially by a clamping ring 8, preferably of titanium.
  • the annular seal 4 serves both to seal between the ice 3 and the side wall 2 and to fix these two parts to each other.
  • a bezel 9 is still fixed around the clamping ring 8 by a connecting ring 10 on horseback between an annular clearance 8a of the clamping ring 8 and an annular groove 9a of the inner lateral face of the bezel 9.
  • This sealing of the ice 3 with a radially compressed ring has the advantage of completely dissociating the compressive strength of the seal.
  • the annular seal 4 allows the ice to slide and remain in constant contact with the adjacent end of the side wall 2 of the protective casing.
  • the variant of the figure 3 differentiates itself essentially from the form of execution of the figure 2 in that the side wall 2 'is reduced mainly to the resistant structure SR, a flange 11 being attached inside the side wall 2' instead of being integrated in the side wall 2 as in the example of the figure 2 .
  • the second variant of the figure 4 differentiates figures 2 and 3 mainly by the fact that the side wall and the bottom form a single piece in the form of cap 12 with a flange 11 reported as in the case of the figure 3 .
  • This flange 11 can be used to hold the movement M of the watch which can only be boxed from the top by leaning against a bearing surface 12a of the inner lateral face of the side wall of the cap 12. The rest of the box is similar to the boxes of figures 2 and 3 .
  • FIGS. 5 and 6 show that this material fulfills both the compressive strength conditions required for the side wall and the bending resistance conditions required for the ice or the bottom, as well as the relative conditions for the modulus of Young, fixed in such a way as to limit the deformation of the materials of the protective envelope, which if it were too high would require increasing the thickness of the box, which is obviously not acceptable.
  • the lower limit that can be set for the Young's modulus is 100,000 MPa, as regards the limit to flexural strength and to compressive strength, each can be set at 500 MPa.
  • Table III is a comparative table relating to the sizing of the wristwatch case, on the one hand according to the present invention, on the other hand according to the box of the state of the art illustrated by the figure 1 .
  • ⁇ u> TABLE III ⁇ / u> Box according to the invention Box according to prior art Pressures of 15.5 MPa equivalent to 1550m 49 MPa pressure equivalent to 4900m Pressure of 15.5 MPa equivalent to 1550m 49 MPa pressure equivalent to 4900m Ice thickness 2.8 mm 5.5 mm 3 mm 5.7 mm Thickness 1.8 mm 3.28 mm 2.55 mm 5 mm Side wall section ( ⁇ int 28.54 mm) 5.76mm x 0.80mm 5.76mm x 1.48mm - - Total thickness box 13.5 mm 17.68 mm 14.52 mm 19.7 mm

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electric Clocks (AREA)

Description

La présente invention se rapporte à une boîte de montre-bracelet étanche comprenant une enveloppe protectrice entourée d'une carrure et d'une lunette.The present invention relates to a waterproof wristwatch box comprising a protective envelope surrounded by a middle and a bezel.

On a déjà proposé dans le CH 690 870 une boîte de montre étanche destinée à des profondeurs de plus de 300 mètres constituée d'une carrure-lunette et d'un fond en matériau moins résistant que l'acier, qui comprend une cuvette intérieure en matériau à résistance mécanique élevée épousant la face interne du fond et au moins en partie la paroi interne de la carrure-lunette et s'appuyant par son bord contre le côté d'une portée de la carrure-lunette opposé au côté sur lequel s'appuie la glace.We have already proposed in the CH 690 870 a waterproof watch case intended for depths of more than 300 meters consisting of a caseband and a bottom made of a material that is less resistant than steel, which includes an inner bowl made of a material of high mechanical strength conforming to the internal face from the bottom and at least partly the inner wall of the middle-telescope and leaning by its edge against the side of a scope of the case-case against the side on which the ice rests.

Cette solution présente deux points faibles qui limitent la profondeur que la boîte étanche peut supporter. Tout d'abord, la présence d'une portée de la carrure en matériau à plus faible résistance mécanique disposée entre la glace et la cuvette intérieure, qui serait écrasée sous une pression dépassant la limite élastique du matériau de la carrure-lunette. Le second point faible vient du fait que la partie de la cuvette qui appuie contre la portée de la carrure-lunette est en porte à faux par rapport à la paroi de la cuvette créant de mauvaises conditions de transmission de la force de compression qui s'exerce sur la cuvette.This solution has two weak points that limit the depth that the sealed box can withstand. First, the presence of a scope of the middle part of lower strength material disposed between the ice and the inner bowl, which would be crushed under a pressure exceeding the elastic limit of the material of the middle-bezel. The second weak point comes from the fact that the portion of the bowl that bears against the scope of the middle-bezel is cantilevered with respect to the wall of the bowl creating poor conditions of transmission of the compression force that s' exerts on the bowl.

Il est mentionné dans ce document que la boîte avec une cuvette en titane de 3 mm d'épaisseur peut atteindre une profondeur de mille mètres. La présence de la portée de la carrure prise entre la glace et la cuvette intérieure ne permettrait cependant pas de descendre beaucoup plus profond sans risque d'écrasement permanent de cette portée.It is mentioned in this document that the box with a titanium bowl of 3 mm thick can reach a depth of one thousand meters. The presence of the scope of the middle part taken between the ice and the inner bowl, however, would not allow to go much deeper without risk of permanent crushing of this scope.

Le document CH 343 949 A décrit une boîte de montre dans laquelle une paroi latérale est réalisée en matière plastique et se déforme. Les éléments plastiques sont en fait utilisés comme joint et sont déformables, ils ne forment donc pas une structure résistant à la compression.The document CH 343 949 A discloses a watch case in which a side wall is made of plastic material and deforms. The plastic elements are actually used as a seal and are deformable, so they do not form a compression-resistant structure.

Le but de la présente invention est de s'affranchir des limitations des solutions de l'état de la technique tout en limitant l'augmentation de l'épaisseur d'une boîte de montre-bracelet étanche, susceptible de supporter une pression déterminée.The object of the present invention is to overcome the limitations of the solutions of the state of the art while limiting the increase in the thickness of a sealed wristwatch case, capable of withstanding a determined pressure.

Le problème qui se pose lorsque l'on veut faire une boîte de montre-bracelet étanche susceptible de résister à de très grandes profondeurs, typiquement entre 3000 et 5000 mètres, est en particulier l'épaisseur. On connaît des boîtes de montres-bracelets étanches susceptibles de résister à des pressions de l'ordre de 10 à 15 MPa, correspondant à des profondeurs respectives de 1000 et 1500 mètres. Ces boîtes ont déjà une épaisseur de l'ordre de 14,5 mm, ce qui est déjà une épaisseur relativement importante pour une montre-bracelet. Pour résister à des pressions 3 à 4 fois supérieures, il faudrait augmenter l'épaisseur d'une telle boîte de plus de 5 mm, ce qui, pour une montre-bracelet, pose des problèmes. A partir d'une certaine épaisseur, chaque millimètre ajouté devient un millimètre en trop.The problem that arises when one wants to make a waterproof wristwatch box capable of withstanding very great depths, typically between 3000 and 5000 meters, is in particular the thickness. Sealed wristwatch boxes are known that can withstand pressures of the order of 10 to 15 MPa, corresponding to depths of 1000 and 1500 meters, respectively. These boxes already have a thickness of the order of 14.5 mm, which is already a relatively large thickness for a wristwatch. To resist pressures 3 to 4 times higher, it would increase the thickness of such a box of more than 5 mm, which, for a wristwatch, poses problems. From a certain thickness, each millimeter added becomes an extra millimeter.

A cet effet, la présente invention a pour objet une boîte de montre-bracelet étanche comprenant une enveloppe protectrice entourée d'une carrure et d'une lunette.For this purpose, the subject of the present invention is a sealed wristwatch box comprising a protective envelope surrounded by a caseband and a telescope.

Un premier aspect de l'invention et différents modes de réalisation d'objets selon celui-ci sont définis par les points qui suivent :

  1. a. Boîte de montre-bracelet étanche comprenant une enveloppe protectrice entourée d'une carrure et d'une lunette, l'enveloppe protectrice comportant une glace, une paroi latérale et un fond et dans laquelle une surface périphérique plane s'étendant sur tout le bord de la face interne de la glace est en contact avec une surface d'appui homologue de la paroi latérale dont au moins une portion forme la largeur de la section d'une structure résistante à la compression à faces latérales parallèles, perpendiculaires à la surface d'appui et qui s'étend, sans solution de continuité, jusqu'au fond de l'enveloppe et englobe au moins une portion de la paroi latérale et du fond de l'enveloppe, la boîte comportant des moyens de fixation et d'étanchéité des éléments de l'enveloppe.
  2. b. Boîte de montre-bracelet étanche selon le point a, dans laquelle les moyens de fixation et d'étanchéité des éléments de l'enveloppe comportent au moins un joint annulaire entourant une partie de section constante de la face latérale de la glace et une partie de section constante de la face latérale externe de la paroi latérale de l'enveloppe et des moyens de serrage radial de ce joint contre ces parties de sections constantes de la glace et de la paroi latérale de l'enveloppe.
  3. c. Boîte de montre-bracelet selon l'un des points a et b, dans laquelle la paroi latérale et le fond de ladite enveloppe sont en deux pièces réalisées en deux matières différentes, un joint étant interposé entre une portée externe du fond de l'enveloppe et une portée de la carrure, une bague de serrage comportant un pas de vis en prise avec un pas de vis de la carrure et une surface de serrage axial en prise avec une surface homologue du fond de l'enveloppe protectrice.
  4. d. Boîte de montre-bracelet selon l'un des points précédents, dans laquelle les composants de la glace et du fond de l'enveloppe sont réalisés dans des matériaux dont le module de Young est > 100.000 Mpa et dont la limite de résistance à la flexion est > 500 Mpa, le matériau de la structure résistante à la compression présentant un module de Young > 100.000 Mpa et une limite de résistance à la compression > 500 Mpa
  5. e. Boîte de montre-bracelet selon le point c dans laquelle la glace est en saphir, le fond est en céramique et la paroi latérale est en un métal ou en un alliage.
  6. f. Boîte de montre-bracelet selon l'un des points b à e, dans laquelle les moyens de serrage radial du joint annulaire comportent d'une part une surface de serrage solidaire de la carrure pour le serrage d'une portion du joint entre la carrure et la face externe de la paroi latérale de l'enveloppe protectrice et d'autre part une bague de serrage pour le serrage d'une autre partie du joint entre cette bague et la surface latérale de la glace.
  7. g. Boîte de montre-bracelet selon l'un des points précédents, dans laquelle la face latérale de la glace et la face externe de la paroi latérale de l'enveloppe sont adjacentes et forment une surface continue délimitant une section constante.
  8. h. Boîte de montre selon l'une des points précédents, dans laquelle la limite de résistance à la flexion des matériaux de la glace et du fond de l'enveloppe est > 550 Mpa et la limite de résistance à la compression du matériau de la structure résistante à la compression est > 750 MPa
  9. i. Boîte de montre-bracelet selon l'une des points précédents, présentant une épaisseur totale inférieure à 17,7 mm et apte à résister à des pressions allant jusqu'à 50 MPa.
  10. j. Boîte de montre-bracelet selon l'un des points précédents, dans laquelle le fond et la paroi latérale de l'enveloppe de protection forment une seule pièce.
  11. k. Boîte de montre-bracelet selon le point j, dans laquelle le fond et la paroi latérale formant une seule pièce est en titane.
  12. l. Boîte de montre-bracelet selon l'un des points précédents, dans laquelle du titane TA6V grade 5 ou du Biodur 108 ou de la zircone ou du saphir est utilisé pour réaliser la paroi latérale de l'enveloppe de protection.
  13. m. Boîte de montre-bracelet selon l'un des points précédents, la boîte de montre étant apte à supporter des profondeurs de plusieurs milliers de mètres, typiquement entre 3000 et 5000 mètres.
  14. n. Montre-bracelet comprenant une boîte selon l'un des points précédents.
A first aspect of the invention and various embodiments of objects according to it are defined by the following points:
  1. at. A waterproof wristwatch box comprising a protective envelope surrounded by a middle and a bezel, the protective envelope having an ice, a side wall and a bottom and in which a flat peripheral surface extending over the entire edge of the inner face of the ice is in contact with a bearing surface homologous to the side wall of which at least one portion forms the width of the section of a compression-resistant structure with parallel side faces, perpendicular to the bearing surface and which extends, without a solution of continuity, to the bottom of the envelope and includes at least a portion of the side wall and the bottom of the envelope, the box comprising means for fixing and sealing of the elements of the envelope.
  2. b. Watertight wristwatch box according to point a, in which the means for fixing and sealing the elements of the envelope comprise at least one annular seal surrounding a portion of constant section of the lateral face of the ice and a portion of constant section of the outer side face of the side wall of the casing and radial clamping means of this seal against these portions of constant sections of the ice and the side wall of the casing.
  3. c. Wristwatch box according to one of the points a and b, wherein the side wall and the bottom of said envelope are in two parts made of two different materials, a seal being interposed between an outer bearing of the bottom of the envelope and a scope of the caseband, a clamping ring having a screw thread in engagement with a thread of the middle part and an axial clamping surface engaged with a homologous surface of the bottom of the protective envelope.
  4. d. Wristwatch box according to one of the preceding points, in which the components of the ice and the bottom of the envelope are made of materials whose Young's modulus is> 100,000 MPa and whose limit of resistance to bending is> 500 MPa, the material of the compression-resistant structure having a modulus of Young> 100,000 MPa and a compression strength limit> 500 MPa
  5. e. Wristwatch box according to the point c in which the crystal is sapphire, the bottom is ceramic and the side wall is a metal or an alloy.
  6. f. Wristwatch box according to one of the points b to e, wherein the radial clamping means of the annular seal comprise firstly a clamping surface secured to the middle part for clamping a portion of the joint between the middle part and the outer face of the side wall of the protective envelope and secondly a clamping ring for clamping another part of the seal between this ring and the side surface of the ice.
  7. g. Wristwatch box according to one of the preceding points, wherein the lateral face of the ice and the outer face of the side wall of the envelope are adjacent and form a continuous surface delimiting a constant section.
  8. h. Watch case according to one of the preceding points, in which the bending strength limit of the materials of the ice and the bottom of the casing is> 550 MPa and the limit of compressive strength of the material of the resistant structure at compression is> 750 MPa
  9. i. Wristwatch box according to one of the preceding points, having a total thickness of less than 17.7 mm and capable of withstanding pressures up to 50 MPa.
  10. j. Wristwatch box according to one of the preceding points, wherein the bottom and the wall side of the protective envelope form a single piece.
  11. k. Wristwatch box according to item j, in which the bottom and the one-piece side wall are made of titanium.
  12. l. A wristwatch box according to one of the preceding points, wherein TA6V grade 5 titanium or Biodur 108 or zirconia or sapphire is used to make the side wall of the protective envelope.
  13. m. A wristwatch box according to one of the preceding points, the watch case being able to withstand depths of several thousand meters, typically between 3000 and 5000 meters.
  14. not. Wristwatch comprising a box according to one of the preceding points.

L'avantage principal de cette boîte de montre étanche est de pouvoir supporter des pressions de plusieurs dizaines de MPa en réduisant sensiblement la surépaisseur par rapport à des boîtes de montres de conception classique, ce qui permet de réaliser une boîte de montre apte à supporter des profondeurs de plusieurs milliers de mètres, typiquement entre 3000 et 5000 mètres, et dont l'épaisseur lui permet encore d'être portée au poignet comme une montre-bracelet. La lunette et la carrure, ne contribuant pas à la protection du mouvement de montre qui se trouve entièrement protégé par l'enveloppe protectrice, peuvent être réalisées dans des matériaux utilisés traditionnellement dans le domaine des boîtes de montres et pouvant aller du plastique au platine en passant par l'acier inox, et les différents alliages d'or.The main advantage of this waterproof watch case is to be able to withstand pressures of several tens of MPa significantly reducing the thickness compared to watch cases of conventional design, which allows for a watch case capable of withstanding depths of several thousand meters, typically between 3000 and 5000 meters, and whose thickness still allows it to be worn on the wrist as a wristwatch. The bezel and the caseband, which do not contribute to the protection of the watch movement which is entirely protected by the protective envelope, can be made of materials traditionally used in the field of watch cases and which can range from plastic to platinum. passing through stainless steel, and different gold alloys.

Un autre avantage de l'invention vient du fait que l'étanchéité et la résistance à la pression sont obtenues par des éléments entièrement distincts qui n'influent pas du tout l'un sur l'autre. Par contre les organes d'étanchéité participent à l'assemblage d'au moins certains des éléments de l'enveloppe protectrice.Another advantage of the invention arises from the fact that the seal and the resistance to pressure are obtained by entirely distinct elements which do not influence at all one over the other. On the other hand, the sealing members participate in the assembly of at least some of the elements of the protective envelope.

Un deuxième aspect de l'invention et différents modes de réalisation d'objets selon celui-ci sont définis par les revendications 1 à 13.

  • La figure 1 est une vue en coupe verticale d'une boîte de montre selon l'état de la technique;
  • la figure 2 est une vue en coupe verticale de la forme d'exécution de la boîte de montre-bracelet étanche selon l'invention;
  • la figure 3 est une vue en coupe verticale d'une première variante de la figure 2;
  • la figure 4 est une vue en coupe verticale d'une seconde variante de la figure 2.
A second aspect of the invention and various embodiments of objects therein are defined by claims 1 to 13.
  • The figure 1 is a vertical sectional view of a watch case according to the state of the art;
  • the figure 2 is a vertical sectional view of the embodiment of the sealed wristwatch case according to the invention;
  • the figure 3 is a vertical sectional view of a first variant of the figure 2 ;
  • the figure 4 is a vertical sectional view of a second variant of the figure 2 .

On a représenté sur la figure 1 une boîte de montre selon l'état de la technique. Cette boîte de montre a été choisie du fait que c'est une boîte de montre-bracelet étanche du marché, testée à 1550 mètres, ce qui en fait une montre-bracelet susceptible de résister à une grande profondeur.We have shown on the figure 1 a watch case according to the state of the art. This watch case was chosen because it is a waterproof wristwatch box market, tested at 1550 meters, which makes it a wristwatch that can withstand a great depth.

Lorsqu'il a été envisagé de faire une boîte de montre susceptible de résister à des pressions de l'ordre de 50 MPa, on a constaté que la boîte de montre étanche classique telle que celle illustrée par la figure 1 conduisait à une épaisseur de boîte de près de 20 mm, ce qui commence à être difficilement acceptable pour une montre-bracelet.When it has been envisaged to make a watch case capable of withstanding pressures of the order of 50 MPa, it has been found that the conventional waterproof watch case such as that illustrated by FIG. figure 1 led to a box thickness of nearly 20 mm, which begins to be hardly acceptable for a wristwatch.

La boîte de montre-bracelet objet de la présente invention et illustrée par la figure 2 comporte une enveloppe de protection entièrement fermée et qui comprend, dans cette forme d'exécution, un fond 1 en un matériau présentant un module de Young suffisant pour limiter la déformation. On verra par la suite que ce module de Young doit être >100.000 MPa. Ce matériau doit surtout présenter une résistance à la flexion sensiblement supérieure à celle des deux matériaux traditionnels que sont l'acier inox et l'or. Dans l'exemple illustré, ce matériau pourrait être une céramique telle que du Zircone. Ce matériau pourrait aussi être du titane qui présente notamment une résistance à la flexion élevée et un module de Young >100.000 MPa.The wristwatch box object of the present invention and illustrated by the figure 2 comprises a completely closed protective envelope and which comprises, in this embodiment, a bottom 1 of a material having a Young's modulus sufficient to limit the deformation. It will be seen later that this Young's modulus must be> 100,000 MPa. This material must above all have a resistance to bending significantly higher than the two traditional materials of stainless steel and gold. In the illustrated example, this material could be a ceramic such as zirconia. This material could also be titanium which has in particular a high flexural strength and a Young's modulus> 100,000 MPa.

Ce fond 1 a un profil en forme d'arche qui améliore sa résistance à la flexion. Son bord se termine par une surface plane la sur laquelle repose une paroi latérale 2 réalisée en un matériau dont la résistance à la compression est sensiblement supérieure à celle de l'acier inox ou de l'or. Etant donné que cette paroi latérale 2 doit être percée pour le passage de la tige de remontoir, on préfèrera un alliage métallique à une céramique. On peut utiliser un alliage tel qu'un acier sans nickel du type Biodur 108 dont les propriétés sont indiquées dans le tableau II.This bottom 1 has an arch-shaped profile that improves its resistance to bending. Its edge ends with a flat surface on which rests a side wall 2 made of a material whose compressive strength is substantially greater than that of stainless steel or gold. Since this side wall 2 must be drilled for the passage of the winding stem, it will prefer a metal alloy to a ceramic. It is possible to use an alloy such as a nickel-free steel of the Biodur 108 type whose properties are indicated in Table II.

Cette paroi latérale 2 est délimitée par deux surfaces planes, l'une en contact avec la surface la du fond 1, l'autre en contact avec une surface plane 3a de la périphérie de la glace 3, laquelle est en saphir qui présente un module de Young et une résistance à la flexion appropriés comme le montre le tableau I.This side wall 2 is delimited by two flat surfaces, one in contact with the surface 1a of the bottom 1, the other in contact with a flat surface 3a of the periphery of the glass 3, which is sapphire which has a module Young's strength and flexural strength as shown in Table I.

L'enveloppe protectrice formée ici par le fond 1, la paroi latérale 2 et la glace 3 comporte une structure résistante à la compression SR à faces latérales parallèles, perpendiculaires aux surfaces d'appui entre cette paroi latérale 2 et le fond 1, d'une part et entre cette paroi latérale 2 et la glace 3, d'autre part et qui s'étend, sans solution de continuité, jusqu'au fond 1 de l'enveloppe et englobe au moins une portion de la paroi latérale 2 et du fond 1 de l'enveloppe. Cette structure résistante à la compression SR est délimitée sur les figures 2 à 4 par deux lignes en traits mixtes. Comme on le verra sur le tableau III, la résistance à la compression de cette paroi latérale 2 peut être adaptée en ajustant l'épaisseur radiale de la structure résistante SR.The protective envelope formed here by the bottom 1, the side wall 2 and the ice 3 comprises a compression-resistant structure SR with parallel side faces, perpendicular to the bearing surfaces between this side wall 2 and the bottom 1, of a part and between this side wall 2 and the ice 3, on the other hand and which extends, without a solution of continuity, to the bottom 1 of the envelope and includes at least a portion of the side wall 2 and the bottom 1 of the envelope. This compression-resistant structure SR is delimited on the Figures 2 to 4 by two lines in phantom. As will be seen in Table III, resistance to the compression of this side wall 2 can be adapted by adjusting the radial thickness of the resistant structure SR.

La paroi latérale 2 présente une paroi latérale externe 2a située dans le prolongement de la surface latérale de la glace 3, les sections transversales délimitées par ces surfaces latérales étant constantes. Ces deux surfaces latérales sont entourées par un joint d'étanchéité annulaire 4. La base 4a de ce joint 4 est comprimée en direction radiale par une portion 5a de surface latérale interne d'une carrure 5 entourant la paroi latérale 2 de l'enveloppe de protection. Une portée interne ménagée entre la portion 5a de surface latérale interne de la carrure 5 et le reste de cette surface latérale entourant la paroi latérale 2 bute contre une portée externe de cette paroi latérale 2.The side wall 2 has an outer side wall 2a located in the extension of the lateral surface of the ice 3, the cross sections delimited by these side surfaces being constant. These two lateral surfaces are surrounded by an annular seal 4. The base 4a of this seal 4 is compressed in the radial direction by a portion 5a of internal lateral surface of a middle part 5 surrounding the side wall 2 of the casing. protection. An inner surface formed between the portion 5a of the inner lateral surface of the middle part 5 and the remainder of this lateral surface surrounding the side wall 2 abuts against an outer surface of this side wall 2.

La partie de la carrure 5 située du côté du fond 1 de l'enveloppe protectrice présente un filetage pour recevoir une bague filetée 6 de serrage entre la carrure 5 et le fond 1. Un joint d'étanchéité 7 est disposé entre une portée externe du fond 1 et la base de la carrure 5.The part of the middle 5 located on the bottom side 1 of the protective envelope has a thread for receiving a threaded ring 6 clamping between the middle 5 and the bottom 1. A seal 7 is disposed between an outer surface of the bottom 1 and the base of the middle part 5.

La portion du joint d'étanchéité annulaire 4 qui entoure la face latérale de la glace 3 est comprimée en direction radiale par une bague de serrage 8, de préférence en titane. Ainsi, le joint d'étanchéité annulaire 4 sert à la fois à faire l'étanchéité entre la glace 3 et la paroi latérale 2 et à fixer ces deux pièces l'une à l'autre. Une lunette 9 est encore fixée autour de la bague de serrage 8 par un anneau de liaison 10 à cheval entre un dégagement annulaire 8a de la bague de serrage 8 et une rainure annulaire 9a de la face latérale interne de la lunette 9.The portion of the annular seal 4 which surrounds the lateral face of the lens 3 is compressed radially by a clamping ring 8, preferably of titanium. Thus, the annular seal 4 serves both to seal between the ice 3 and the side wall 2 and to fix these two parts to each other. A bezel 9 is still fixed around the clamping ring 8 by a connecting ring 10 on horseback between an annular clearance 8a of the clamping ring 8 and an annular groove 9a of the inner lateral face of the bezel 9.

Ce montage étanche de la glace 3 à l'aide d'une bague comprimée en direction radiale présente l'avantage de dissocier complètement la résistance à la compression de l'étanchéité. En outre, si une légère compression élastique de la paroi latérale 2 se produit à très grande profondeur, le joint annulaire 4 permet à la glace de coulisser et de rester constamment en contact avec l'extrémité adjacente de la paroi latérale 2 de l'enveloppe de protection.This sealing of the ice 3 with a radially compressed ring has the advantage of completely dissociating the compressive strength of the seal. In addition, if a slight elastic compression of the side wall 2 occurs at very great depth, the annular seal 4 allows the ice to slide and remain in constant contact with the adjacent end of the side wall 2 of the protective casing.

La variante de la figure 3 se différentie essentiellement de la forme d'exécution de la figure 2 par le fait que la paroi latérale 2' se réduit principalement à la structure résistante SR, un réhaut 11 étant rapporté à l'intérieur de la paroi latérale 2' au lieu d'être intégré à la paroi latérale 2 comme dans l'exemple de la figure 2.The variant of the figure 3 differentiates itself essentially from the form of execution of the figure 2 in that the side wall 2 'is reduced mainly to the resistant structure SR, a flange 11 being attached inside the side wall 2' instead of being integrated in the side wall 2 as in the example of the figure 2 .

La seconde variante de la figure 4 se différentie des figures 2 et 3 principalement par le fait que la paroi latérale et le fond forment une seule pièce en forme de calotte 12 avec un réhaut 11 rapporté comme dans le cas de la figure 3. Ce réhaut 11 peut servir à retenir le mouvement M de la montre qui ne peut être mis en boîte que par le haut en s'appuyant contre une portée 12a de la face latérale interne de la paroi latérale de la calotte 12. Le reste de la boîte est semblable aux boîtes des figures 2 et 3.The second variant of the figure 4 differentiates figures 2 and 3 mainly by the fact that the side wall and the bottom form a single piece in the form of cap 12 with a flange 11 reported as in the case of the figure 3 . This flange 11 can be used to hold the movement M of the watch which can only be boxed from the top by leaning against a bearing surface 12a of the inner lateral face of the side wall of the cap 12. The rest of the box is similar to the boxes of figures 2 and 3 .

Le fait de réunir les deux pièces 1 et 2 en une seule pièce 12 pose actuellement un problème de fabrication au cas où on ferait cette pièce 12 en céramique, étant donné le perçage nécessaire pour le passage de la tige de remontoir.The fact of joining the two parts 1 and 2 in one piece 12 currently poses a manufacturing problem in case it would make this piece 12 ceramic, given the drilling required for the passage of the winding stem.

Il ne serait pas possible de réaliser toute la pièce 12 dans l'alliage Biodur 108 utilisé pour la seule paroi latérale des figures 2 et 3 étant donné que ce matériau n'a pas une résistance à la flexion suffisante. Par contre rien n'empêche de réaliser cette pièce 12 en titane. En effet, les figures 5 et 6 montrent que ce matériau remplit aussi bien les conditions de résistance à la compression requises pour la paroi latérale que les conditions de résistance à la flexion requises pour la glace ou le fond, ainsi que les conditions relatives pour le module de Young, fixées de manière à limiter la déformation des matériaux de l'enveloppe de protection, qui si elle était trop élevée nécessiterait d'augmenter l'épaisseur de la boîte, ce qui n'est évidemment pas acceptable.It would not be possible to make all the piece 12 in the alloy Biodur 108 used for the only side wall of figures 2 and 3 since this material does not have sufficient flexural strength. By cons nothing prevents to achieve this piece 12 titanium. In fact, FIGS. 5 and 6 show that this material fulfills both the compressive strength conditions required for the side wall and the bending resistance conditions required for the ice or the bottom, as well as the relative conditions for the modulus of Young, fixed in such a way as to limit the deformation of the materials of the protective envelope, which if it were too high would require increasing the thickness of the box, which is obviously not acceptable.

Les deux tableaux ci-après résument les conditions que les matériaux utilisés pour différents éléments de l'enveloppe de protection doivent satisfaire pour réaliser une boîte de montre apte à résister à des pressions allant jusqu'à 50 MPa. TABLEAU I Glace et fond Matériaux adéquats Matériaux inadéquats Titane TA6V grade 5 Zircone (ZrO2) Saphir (Al2O3) Inox AISI 904L Or jaune 3N (Au 750) Module d'Young (MPa) 114000 220000 355000 193500 85500 Limite à la flexion (MPa) 900 1400 570 250 350 TABLEAU II Paroi latérale Matériaux adéquats Matériaux inadéquats Titane TA6V grade 5 Biodur 108 Zircone (ZrO2) Saphir (Al2O3) Inox AISI 904L Or jaune 3N (Au 750) Module d'Young (MPa) 114000 195000 220000 355000 193500 85500 Limite à la compression (MPa) 1100 770 3000 2950 250 350 The following two tables summarize the conditions that the materials used for different elements of the protective enclosure must satisfy to achieve a watch case capable of withstanding pressures up to 50 MPa. TABLE I Ice and background Suitable materials Inadequate materials Titanium TA6V grade 5 Zirconia (ZrO2) Sapphire (Al2O3) Stainless steel AISI 904L 3N yellow gold (at 750) Young's module (MPa) 114000 220000 355000 193500 85500 Bending limit (MPa) 900 1400 570 250 350 Side wall Suitable materials Inadequate materials Titanium TA6V grade 5 Biodur 108 Zirconia (ZrO2) Sapphire (Al2O3) Stainless steel AISI 904L 3N yellow gold (at 750) Young's module (MPa) 114000 195000 220000 355000 193500 85500 Limit to compression (MPa) 1100 770 3000 2950 250 350

On peut constater de ces tableaux ainsi que de simulations effectuées à partir des valeurs de ces tableaux, que la limite inférieure que l'on peut fixer pour le module de Young est de 100.000 MPa, quant à la limite à la résistance à la flexion et à la résistance à la compression, on peut les fixer chacune à 500 MPa.It can be seen from these tables as well as from simulations made from the values of these tables, that the lower limit that can be set for the Young's modulus is 100,000 MPa, as regards the limit to flexural strength and to compressive strength, each can be set at 500 MPa.

Le tableau III ci-dessous est un tableau comparatif relatif au dimensionnement de la boîte de montre-bracelet, d'une part selon la présente invention, d'autre part selon la boîte de l'état de la technique illustrée par la figure 1. TABLEAU III Boîte selon l'invention Boîte selon art antérieur Pressions de 15,5 MPa équivalente à 1550m Pression de 49 MPa équivalente à 4900m Pression de 15,5 MPa équivalente à 1550m Pression de 49 MPa équivalente à 4900m Epaisseur glace 2.8 mm 5.5 mm 3 mm 5.7 mm Epaisseur fond 1.8 mm 3.28 mm 2.55 mm 5 mm Section paroi latérale (Øint 28.54 mm) 5.76 mm x 0.80 mm 5.76 mm x 1.48 mm - - Epaisseur totale boîte 13.5 mm 17.68 mm 14.52 mm 19.7 mm Table III below is a comparative table relating to the sizing of the wristwatch case, on the one hand according to the present invention, on the other hand according to the box of the state of the art illustrated by the figure 1 . <u> TABLE III </ u> Box according to the invention Box according to prior art Pressures of 15.5 MPa equivalent to 1550m 49 MPa pressure equivalent to 4900m Pressure of 15.5 MPa equivalent to 1550m 49 MPa pressure equivalent to 4900m Ice thickness 2.8 mm 5.5 mm 3 mm 5.7 mm Thickness 1.8 mm 3.28 mm 2.55 mm 5 mm Side wall section (Øint 28.54 mm) 5.76mm x 0.80mm 5.76mm x 1.48mm - - Total thickness box 13.5 mm 17.68 mm 14.52 mm 19.7 mm

On peut constater que pour une même pression de 49 MPa, la réduction d'épaisseur est de 2,02 mm, soit de 10,25%. Cette comparaison est intéressante étant donné qu'elle a été faite sur deux boîtes de montres-bracelets étanches pour deux mouvements de montres M identiques, ce qui signifie que les 2,02 mm gagnés sur l'épaisseur de la boîte sont uniquement dus au concept de boîte objet de la présente invention.It can be seen that for the same pressure of 49 MPa, the reduction in thickness is 2.02 mm, or 10.25%. This comparison is interesting since it was made on two boxes of waterproof wristwatches for two movements of identical M watches, which means that the 2.02 mm gained on the thickness of the box are solely due to the concept of box object of the present invention.

Ceci montre que, quelle que soit la profondeur à laquelle on veut que la boîte de montre-bracelet étanche puisse résister, la structure de la boîte selon l'invention permet une réduction d'épaisseur. Certes, plus la profondeur est grande plus le gain est important, mais le tableau III montre que ce gain est déjà de pratiquement 1 mm à une pression de 15,5 MPa.This shows that, whatever the depth at which the waterproof wristwatch box can be resisted, the structure of the box according to the invention allows a reduction in thickness. Admittedly, the greater the depth is greater the gain is important, but Table III shows that this gain is already almost 1 mm at a pressure of 15.5 MPa.

Claims (14)

  1. Sealed wrist watch case comprising a protective casing surrounded by a middle (5) and a bezel (9), the protective casing including a glass (3), a side wall (2) and a bottom (1) and in which a planar peripheral surface extending along the entire edge of the inner face of the glass is in contact with a similar bearing surface on the side wall (2), at least part of which forms the width of the cross section of a pressure resistant structure having parallel lateral faces (SR) perpendicular to the bearing surface and which extends continuously as far as the bottom (1) of the casing and overlaps at least part of the side wall (2) and of the bottom (1) of the casing, the case including means for securing and sealing (4) the components of the casing, characterized in that the compression of the protective casing does not crush the sealing means (4) between the glass and the side wall.
  2. Sealed wrist watch case according to Claim 1, in which the means for securing and sealing the components of the casing comprise at least one annular seal (4) surrounding a portion, of constant cross section, of the lateral face of the glass (3) and a portion, of constant cross section, of the outer lateral face of the side wall (2) of the casing, and means (8, 5a) for radially clamping this seal to these portions, of constant cross section, of the glass (3) and of the side wall (2) of the casing.
  3. Wrist watch case according to either of Claims 1 and 2, in which the side wall (2) and the bottom (1) of said casing are in two pieces made of two different materials, a seal (7) being provided between an outer shoulder of the bottom (1) of the casing and a shoulder of the middle (5), a clamp ring (6) including a screw thread in engagement with a screw thread of the middle (5) and a surface for axial clamping in engagement with a similar surface on the bottom (1) of the protective casing.
  4. Wrist watch case according to one of the preceding claims, in which the components of the glass (3) and the bottom (1) of the casing are made of materials the Young's modulus of which is > 100 000 MPa and the flexural strength of which is > 500 MPa, the material of the pressure resistant structure (SR) having a Young's modulus > 100 000 MPa and a compressive strength > 500 MPa.
  5. Wrist watch case according to Claim 3, in which the glass (3) is made of sapphire, the bottom (1) is made of ceramic and the side wall (2) is made of a metal or an alloy.
  6. Wrist watch case according to one of Claims 2 to 5, in which the means for radially clamping the annular seal (4) comprise firstly a clamping surface (5a) secured to the middle (5) in order to clamp part (4a) of the seal (4) between the middle (5) and the outer face of the side wall (2) of the protective casing, and secondly a clamp ring (8) in order to clamp a different part of the seal (4) between this ring (8) and the lateral surface of the glass (3).
  7. Wrist watch case according to one of the preceding claims, in which the lateral face of the glass (3) and the outer face of the side wall (2) of the casing are adjacent to one another and form a continuous surface defining a constant cross section.
  8. Watch case according to one of the preceding claims, in which the materials of the glass (3) and the bottom (1) of the casing have a flexural strength > 550 MPa and the material of the pressure resistant structure has a compressive strength > 750 MPa.
  9. Wrist watch case according to one of the preceding claims, having an overall thickness less than 17.7 mm and resistant to pressures up to 50 MPa.
  10. Wrist watch case according to one of the preceding claims, in which the bottom and the side wall of the protective casing form a single piece (12).
  11. Wrist watch case according to Claim 10, in which the bottom and the side wall forming a single piece (12) are made of titanium.
  12. Wrist watch case according to one of the preceding claims, in which titanium TA6V grade 5 or Biodur 108 or zirconia (ZrO2) or sapphire (Al2O3) is used to produce the side wall of the protective casing.
  13. Wrist watch case according to one of the preceding claims, the watch case being able to tolerate depths of several thousand metres, typically between 3000 and 5000 metres.
  14. Wrist watch comprising a case according to one of the preceding claims.
EP14192782.2A 2007-07-02 2007-07-02 Watertight wrist-watch case Active EP2851755B1 (en)

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EP14192782.2A EP2851755B1 (en) 2007-07-02 2007-07-02 Watertight wrist-watch case
EP07405187.1A EP1916576B1 (en) 2007-07-02 2007-07-02 Watertight wrist-watch case

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US8366313B2 (en) * 2009-08-04 2013-02-05 Daniel Scioscia Wrist mounted watchcase having separable main body and surrounding protective frame and wristwatch incorporating same
US8870449B2 (en) 2009-08-04 2014-10-28 Daniel Scioscia Wrist mounted watchcase having separable main body and surrounding protective frame and wristwatch incorporating same
US8770832B1 (en) 2013-01-24 2014-07-08 Howard Kuo Flip watch bezel
CN107950174B (en) * 2013-03-18 2021-06-15 株式会社久保田 Combine harvester
EP3243894A1 (en) * 2016-05-10 2017-11-15 The Procter and Gamble Company Cleaning composition
JP2021167809A (en) 2020-04-03 2021-10-21 ロレックス・ソシエテ・アノニムRolex Sa Sealing system for timepiece case
EP3936732B1 (en) 2020-07-10 2023-03-15 Rolex Sa Threaded timepiece member
WO2023135132A1 (en) 2022-01-13 2023-07-20 Rolex Sa Reinforced watch case

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EP2851755A3 (en) 2016-06-08
US7901129B2 (en) 2011-03-08
DE07405187T1 (en) 2008-12-04
JP5555411B2 (en) 2014-07-23
EP2851755A2 (en) 2015-03-25
JP2009014721A (en) 2009-01-22
US20090010111A1 (en) 2009-01-08
EP1916576A1 (en) 2008-04-30
EP1916576B1 (en) 2014-12-17

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