EP0686897B1 - Watch case with a rotating bezel - Google Patents

Watch case with a rotating bezel Download PDF

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Publication number
EP0686897B1
EP0686897B1 EP95810365A EP95810365A EP0686897B1 EP 0686897 B1 EP0686897 B1 EP 0686897B1 EP 95810365 A EP95810365 A EP 95810365A EP 95810365 A EP95810365 A EP 95810365A EP 0686897 B1 EP0686897 B1 EP 0686897B1
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EP
European Patent Office
Prior art keywords
spring
bezel
rotating bezel
toothed rack
wire
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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.)
Expired - Lifetime
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EP95810365A
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German (de)
French (fr)
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EP0686897A1 (en
Inventor
Augustin Nussbaum
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.)
Rolex SA
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Montres Rolex SA
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Publication date
Application filed by Montres Rolex SA filed Critical Montres Rolex SA
Publication of EP0686897A1 publication Critical patent/EP0686897A1/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
    • G04B19/00—Indicating the time by visual means
    • G04B19/28—Adjustable guide marks or pointers for indicating determined points of time
    • G04B19/283—Adjustable guide marks or pointers for indicating determined points of time on rotatable rings, i.e. bezel

Definitions

  • the present invention relates to a watch case with rotating bezel comprising a device for angular positioning of the bezel, having on the one hand, a toothing and on the other hand, a wire spring whose free end is elastically and radially in engagement with the toothing, the two engaging parts of the spring and the toothing, being shaped to allow displacement by angular steps of the telescope in the two directions of rotation thereof, this toothing and the other end of the wire spring being, one, integral with the rotating bezel and the other, with the box.
  • Figure 1 shows a partial plan view of a watch case with a rotating bezel.
  • Figure 2 is a sectional view along line II-II of Figure 1 and
  • Figure 3 is a sectional view of the case with the watch movement.
  • Figures 1 and 2 show only a fixed ring 17 (intended to be driven out on a case middle 10, Figure 3) and the rotating bezel 18 without the ring 20 drawn in broken lines in Figure 2, which allows to see, in FIG. 1, the positioning mechanism which comprises a toothing 21 formed on the internal lateral face of the rotating bezel 18 and a positioning wire spring 6, one end 6a of which is bent and enters a hole 7 in the fixed ring 17, the other end of which is bent in the shape of a V, 6b, enters the toothing 21.
  • the wire spring 6 is slightly arched with its center of curvature located outside of the rotating bezel 18, the part convex of the wire spring 6 pressing in the bottom of a milling 8 formed in an external lateral face of the fixed ring 17.
  • the wire spring 6 is thus reinforced and tends to keep the free end 6b in engagement with the teeth.
  • CH 536.509 has already proposed a device for angular positioning of a rotating bezel, capable of requiring equal forces to rotate this bezel in both directions.
  • a toothing is formed under a lower face of the rotating bezel, the teeth having a profile in the shape of an equilateral or isosceles triangle.
  • a piston is mounted in a cylindrical housing with a longitudinal axis parallel to the axis of rotation of the rotating bezel, formed in an upper face of the middle part, underlying the rotating bezel.
  • This piston is pressed axially against the teeth of the rotating bezel by a coil spring disposed between one end of the piston and the bottom of the cylindrical housing.
  • the other end of the piston has a profile substantially matching the space between two teeth. The angle formed by each face of the teeth relative to the longitudinal axis of the piston being the same, the force necessary to rotate the telescope is equal in the two directions of rotation.
  • EP-A-0 470 018 relates to a mechanism in which an open ring-shaped spring has one end secured to a driving rotary element and another end engaged elastically in a notch of a driven rotary coaxial element to the driving element. Beyond a given torque value, the driven and driving rotary elements become detached by sliding the spring. Contrary to what the present invention seeks, this mechanism provides a different slip torque value, depending on the direction of rotation, as specified in this document.
  • DE-A-16 73 621 relates to a mechanism for positioning a toothed wheel comprising a spring fixed to a dowel at one end and pressing a second dowel at the other end.
  • the middle part of this spring located at the top of an obtuse angle between two straight branches, has a projecting part in an arc, which engages in the teeth of the wheel. It is therefore not, in this case, a spring whose free end is engaged with a toothing. It is indeed the middle part of the spring which is used to position the teeth. Since one end of the spring is fixed while the other can slide on the pin against which it rests, the force necessary to overcome the pressure of the spring is not the same in the two directions of rotation of the wheel.
  • the object of the present invention is to remedy, at least in part, these drawbacks.
  • the present invention relates to a watch case with a rotating bezel as defined by claim 1.
  • the advantage of the proposed solution lies in the fact that it does not cause as only modifications a change in the shape of the spring and, preferably, the formation of a second milling in the fixed ring integral with the middle part.
  • FIGS. 1 and 2 illustrates in addition to the above-mentioned FIGS. 1 and 2 relating to the state of the art, an embodiment of the watch case with rotating bezel which is the subject of the present invention.
  • Figure 3 is a sectional view of a complete watch case (valid for the state of the art as for the invention).
  • FIG. 4 is a partial view from above, without the ring carrying the graduations, of the only rotating bezel mechanism of the box of FIG. 3.
  • Figures 5 and 6 are sectional views respectively along lines V-V and VI-VI of Figure 4.
  • Figures 7 and 8 are views similar to Figure 4 showing the behavior of the positioning spring of the rotating bezel in each direction of rotation.
  • Figures 7a and 8a are enlarged partial views of Figures 7 and 8 respectively.
  • the watch case with rotating bezel illustrated in FIG. 3 comprises a middle part 10, a bottom 11 screwed into the middle part, a seal 12 between the bottom 11 and the middle part 10 and a crystal 13 provided with a peripheral groove 14 in which a lateral projection 15a of an annular seal 15 is engaged.
  • This seal is clamped between a cylindrical surface 16 of the middle part 10 and a ring 17 driven around the annular seal 15.
  • This ring 17 has a conical peripheral face 17a on which is hooked a rotating bezel 18 which has a conical face 18a corresponding to the face 17a.
  • An elastic flat ring 19 bears by the part of its lower face adjacent to its internal edge, against the fixed ring 17 and by the part of its upper face adjacent to its external edge, against the rotating bezel 18 and is used to apply elastically one against the other the conical faces 17a of the ring 17 and 18a of the rotating bezel 18. It is noted that the rotating bezel 18 can be moved axially against the middle part 10, at the against the pressure of the elastic flat ring 19, thus making it possible to separate the conical faces 17a and 18a from one another and to rotate the bezel 18.
  • This rotating bezel 18 also has an upper reach 18b, on which is forcibly engaged a ring 20 carrying, for example, the hour markings.
  • the part of the rotating bezel 18 adjacent to the scope receiving the ring 20 extends inward.
  • a toothing 21 is cut in this part of the rotating bezel 18.
  • the device for positioning the rotating bezel 18 comprises a wire spring 22, one bent end 22a (FIG. 5) being engaged in an anchoring opening 23 of the ring fixed 17, and the other end of which is doubly angled in the shape of a V 22b to engage in the toothing 21.
  • This wire spring 22, which extends over approximately 1 ⁇ 4 of the circumference of the telescope, has three separate segments, two practically straight segments 22c, 22d adjacent respectively to the ends 22a, 22b. These practically straight segments 22c, 22d are connected to each other by a segment 22e in an arc. The center of this circular arc is inside the ring 17, but its radius is smaller than that of the rotating bezel 18.
  • the radius of curvature of segment 22e corresponds to half the mean radius of the rotating bezel 18.
  • the two practically straight segments 22c and 22d are substantially tangent to a circle centered on the central axis of the case.
  • the material used to make the wire spring 22 is an alloy of steel sold under the brand Nivaflex R and subjected to a conventional heat treatment for 4 hours at 400 ° C.
  • millings 24 and 25 are provided in the internal annular part 17b of the fixed ring 17, which is also the part of this ring whose height is the greatest. Milling 24 is practically tangent to a circle centered on the central axis of the ring 17 and passes through the edge of the hole 23 closest to this central axis. This milling 24 is also practically parallel to the segment 22c of the wire spring 22. A clearance 23a formed in line with the hole 23 allows the introduction of the end 22a of the wire spring 22 into this hole 23.
  • the other milling 25 forms an arc centered on the central axis of the ring 17. It serves to support a part of the side of the segment 22d of the wire spring 22 opposite the toothing 21, thus maintaining the bent end 22b constantly elastically engaged with teeth 21.
  • FIG. 7 shows in solid lines the wire spring 22 in the rest position with its doubly bent end 22b, engaged between two teeth of the teeth 21.
  • the force F 3 which is exerted on the end 22b of the wire spring forms a very small acute angle with the segment 22d of the wire spring 22, so that most of this force is transmitted by the segment 22d to the segment 22nd in an arc, making it flex outwards.
  • the segment 22d swings slightly around its support against the milling 25, in the opposite direction to that of the hands of the watch, allowing the passage of the tooth, after which the bent end in V 22b again penetrates into the next interdental space.
  • this same force which is exerted almost in the axis of the segment 22d serves to bend the arcuate segment 22e.
  • the force applied to this arc segment 22e by the segment 22d is substantially tangential to this arc segment 22e.
  • it is connected to the anchor point formed by the opening 23, by the segment 22c, tangent to the other end of the segment 22e and which is mounted freely in this opening 23, so that this amounts to compressing the arcuate segment 22e by applying to it two tangential forces of opposite direction at its respective ends.
  • the force to be exerted on the bezel 18 is therefore substantially less than that which must be exerted on the rotating bezel 3 of Figures 1 and 2 of the prior art.
  • FIG. 8 shows the behavior of the spring 22 when the rotating bezel is driven in the opposite direction to that of the watch hands (arrow F R ).
  • the force F 4 exerted on the end 22b pulls this end in the direction of rotation F R and causes on the arcuate segment 22e a tangential traction which brings back the curvature of this segment towards the center and causes tilting of the segment 22d around its fulcrum against the milling 25 in the clockwise direction, thereby increasing the force to be exerted on the bezel 18 to rotate it.
  • the spring 22 makes it possible to reduce the force necessary for driving the rotating bezel 18 in the clockwise direction (F A ) and to increase this force when this rotating bezel 18 is driven in the direction inverse (F R ). It is also possible, thanks to the shape of the spring 22, to finely balance the force necessary to rotate the bezel in both directions of rotation by acting on its curvature if necessary.

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

Description

La présente invention se rapporte à une boîte de montre à lunette tournante comportant un dispositif de positionnement angulaire de la lunette, présentant d'une part, une denture et d'autre part, un ressort-fil dont l'extrémité libre est élastiquement et radialement en prise avec la denture, les deux parties en prise, du ressort et de la denture, étant conformées pour permettre le déplacement par pas angulaires de la lunette dans les deux sens de rotation de celle-ci, cette denture et l'autre extrémité du ressort-fil étant, l'un, solidaire de la lunette tournante et, l'autre, de la boîte.The present invention relates to a watch case with rotating bezel comprising a device for angular positioning of the bezel, having on the one hand, a toothing and on the other hand, a wire spring whose free end is elastically and radially in engagement with the toothing, the two engaging parts of the spring and the toothing, being shaped to allow displacement by angular steps of the telescope in the two directions of rotation thereof, this toothing and the other end of the wire spring being, one, integral with the rotating bezel and the other, with the box.

L'état de la technique est illustré par les figures 1 à 3. La figure 1 représente une vue partielle en plan d'une boîte de montre à lunette tournante. La figure 2 est une vue en coupe selon la ligne II-II de la figure 1 et la figure 3 est une vue en coupe de la boîte avec le mouvement de montre.The prior art is illustrated in Figures 1 to 3. Figure 1 shows a partial plan view of a watch case with a rotating bezel. Figure 2 is a sectional view along line II-II of Figure 1 and Figure 3 is a sectional view of the case with the watch movement.

Les figures 1 et 2 ne montrent qu'une bague fixe 17 (destinée à être chassée sur une carrure de boîte 10, figure 3) et la lunette tournante 18 sans l'anneau 20 dessiné en traits interrompus sur la figure 2, ce qui permet de voir, sur la figure 1, le mécanisme de positionnement qui comporte une denture 21 ménagée sur la face latérale interne de la lunette tournante 18 et un ressort-fil de positionnement 6 dont une extrémité 6a est coudée et pénètre dans un trou 7 de la bague fixe 17, et dont l'autre extrémité coudée en forme de V, 6b, pénètre dans la denture 21. Le ressort-fil 6 est légèrement arqué avec son centre de courbure situé à l'extérieur de la lunette tournante 18, la partie convexe du ressort-fil 6 appuyant dans le fond d'un fraisage 8 ménagé dans une face latérale externe de la bague fixe 17. Le ressort-fil 6 est ainsi armé et tend à maintenir l'extrémité libre 6b en prise avec la denture.Figures 1 and 2 show only a fixed ring 17 (intended to be driven out on a case middle 10, Figure 3) and the rotating bezel 18 without the ring 20 drawn in broken lines in Figure 2, which allows to see, in FIG. 1, the positioning mechanism which comprises a toothing 21 formed on the internal lateral face of the rotating bezel 18 and a positioning wire spring 6, one end 6a of which is bent and enters a hole 7 in the fixed ring 17, the other end of which is bent in the shape of a V, 6b, enters the toothing 21. The wire spring 6 is slightly arched with its center of curvature located outside of the rotating bezel 18, the part convex of the wire spring 6 pressing in the bottom of a milling 8 formed in an external lateral face of the fixed ring 17. The wire spring 6 is thus reinforced and tends to keep the free end 6b in engagement with the teeth.

Lorsque l'on tourne la lunette 18 dans le sens des aiguilles de la montre, on applique sur l'extrémité 6b du ressort-fil 6, une force F1 qui forme un angle très aigu avec le ressort-fil 6, de sorte que la composante qui tend à faire fléchir le ressort-fil est faible. Au contraire, si on tourne la lunette 18 dans le sens inverse de celui des aiguilles de la montre, la force F2 appliquée est dirigée sensiblement perpendiculairement au ressort-fil 6.When the bezel 18 is turned clockwise, a force F 1 is applied to the end 6b of the wire spring 6 which forms a very acute angle with the wire spring 6, so that the component which tends to bend the wire spring is weak. On the contrary, if we turn the bezel 18 in the opposite direction to that of the watch hands, the applied force F 2 is directed substantially perpendicular to the wire spring 6.

Il résulte de ceci que la force nécessaire pour faire tourner la lunette 18 varie de façon sensible suivant le sens de rotation.It follows from this that the force necessary to rotate the telescope 18 varies significantly depending on the direction of rotation.

On a déjà proposé dans le CH 536,509 un dispositif de positionnement angulaire de lunette tournante, susceptible de nécessiter des forces égales pour faire tourner cette lunette dans les deux sens. A cet effet, une denture de chant est ménagée sous une face inférieure de la lunette tournante, les dents présentant un profil en forme de triangle équilatéral ou isocèle. Un piston est monté dans un logement cylindrique d'axe longitudinal parallèle à l'axe de rotation de la lunette tournante, ménagé dans une face supérieure de la carrure, sous-jacente à la lunette tournante. Ce piston est pressé axialement contre la denture de la lunette tournante par un ressort à boudin disposé entre une extrémité du piston et le fond du logement cylindrique. L'autre extrémité du piston présente un profil épousant sensiblement l'espace entre deux dents. L'angle formé par chaque face des dents par rapport à l'axe longitudinal du piston étant le même, la force nécessaire pour faire tourner la lunette est égale dans les deux sens de rotation.CH 536.509 has already proposed a device for angular positioning of a rotating bezel, capable of requiring equal forces to rotate this bezel in both directions. For this purpose, a toothing is formed under a lower face of the rotating bezel, the teeth having a profile in the shape of an equilateral or isosceles triangle. A piston is mounted in a cylindrical housing with a longitudinal axis parallel to the axis of rotation of the rotating bezel, formed in an upper face of the middle part, underlying the rotating bezel. This piston is pressed axially against the teeth of the rotating bezel by a coil spring disposed between one end of the piston and the bottom of the cylindrical housing. The other end of the piston has a profile substantially matching the space between two teeth. The angle formed by each face of the teeth relative to the longitudinal axis of the piston being the same, the force necessary to rotate the telescope is equal in the two directions of rotation.

L'inconvénient de cette solution vient du fait de la dimension axiale importante occupée par le dispositif à piston et ressort. Si un tel dispositif peut à la rigueur être logé dans la carrure pour travailler avec une denture de chant permettant d'exercer sur elle une pression parallèle à l'axe de rotation de la lunette, elle n'est pas utilisable pour manque de place avec une denture ménagée sur une face latérale de la lunette sur laquelle l'organe de positionnement doit appliquer une force radiale. En effet, dans ce cas la place disponible entre la lunette tournante et la glace de montre qui se situe sur le même plan ne permet en aucun cas de loger ce dispositif de positionnement à piston qui devrait alors travailler radialement et non plus axialement par rapport au centre de rotation de la lunette tournante.The drawback of this solution comes from the large axial dimension occupied by the piston and spring device. If such a device can, if need be, be housed in the middle part to work with a toothing making it possible to exert on it a pressure parallel to the axis of rotation of the bezel, it cannot be used for lack of space with a toothing formed on a lateral face of the telescope on which the positioning member must apply a radial force. In this case, the space available between the rotating bezel and the watch crystal which is located on the same plane does not in any way allow this piston positioning device to be housed which should then work radially and no longer axially with respect to the center of rotation of the rotating bezel.

Le EP-A-0 470 018 se rapporte à un mécanisme dans lequel un ressort en forme d'anneau ouvert a une extrémité solidaire d'un élément rotatif menant et une autre extrémité engagée élastiquement dans un crantage d'un élément rotatif mené, coaxial à l'élément menant. Au-delà d'une valeur de couple donnée, les éléments rotatifs menés et menant se désolidarisent par glissement du ressort. Au contraire de ce que cherche à obtenir la présente invention, on obtient par ce mécanisme une valeur de couple de glissement différente, suivant le sens de rotation, comme ceci est spécifié dans ce document.EP-A-0 470 018 relates to a mechanism in which an open ring-shaped spring has one end secured to a driving rotary element and another end engaged elastically in a notch of a driven rotary coaxial element to the driving element. Beyond a given torque value, the driven and driving rotary elements become detached by sliding the spring. Contrary to what the present invention seeks, this mechanism provides a different slip torque value, depending on the direction of rotation, as specified in this document.

Le DE-A-16 73 621 se rapporte à un mécanisme de positionnement d'une roue dentée comprenant un ressort fixé à une cheville par une extrémité et appuyant sur une seconde cheville à l'autre extrémité. La partie médiane de ce ressort située au sommet d'un angle obtu entre deux branches droites, présente une partie saillante en arc de cercle, qui s'engage dans la denture de la roue. Il ne s'agit donc pas, dans ce cas, d'un ressort dont l'extrémité libre est en prise avec une denture. C'est en effet la partie médiane du ressort qui sert à positionner la denture. Etant donné qu'une extrémité du ressort est fixe alors que l'autre peut glisser sur la cheville contre laquelle elle appuie, la force nécessaire pour vaincre la pression du ressort n'est pas la même dans les deux sens de rotation de la roue. En effet, dans un sens, la denture exerce une pression sur le ressort dont une composante fait glisser l'extrémité libre du ressort contre la cheville, alors qu'en sens inverse cette même composante est sensiblement parallèle à la branche rectiligne du ressort dont l'extrémité est fixée à l'autre cheville. Comme cette extrémité du ressort est fixe et que la composante de force est parallèle à la branche rectiligne du ressort cette composante est neutralisée et seule l'autre composante de force peut faire fléchir le ressort. Ceci explique pourquoi ce système ne permet pas de travailler avec la même force dans les deux sens de rotation de la roue à positionner et n'apporte donc pas de solution au problème que l'on se propose de résoudre.DE-A-16 73 621 relates to a mechanism for positioning a toothed wheel comprising a spring fixed to a dowel at one end and pressing a second dowel at the other end. The middle part of this spring located at the top of an obtuse angle between two straight branches, has a projecting part in an arc, which engages in the teeth of the wheel. It is therefore not, in this case, a spring whose free end is engaged with a toothing. It is indeed the middle part of the spring which is used to position the teeth. Since one end of the spring is fixed while the other can slide on the pin against which it rests, the force necessary to overcome the pressure of the spring is not the same in the two directions of rotation of the wheel. Indeed, in one direction, the toothing exerts pressure on the spring, one component of which slides the free end of the spring against the ankle, while in the opposite direction this same component is substantially parallel to the straight branch of the spring, the l end is attached to the other dowel. As this end of the spring is fixed and the force component is parallel to the straight branch of the spring, this component is neutralized and only the other force component can cause the spring to flex. This explains why this system does not allow working with the same force in the two directions of rotation of the wheel to be positioned and therefore does not provide a solution to the problem which it is proposed to solve.

Le but de la présente invention est de remédier, au moins en partie, à ces inconvénients.The object of the present invention is to remedy, at least in part, these drawbacks.

A cet effet, la présente invention a pour objet une boîte de montre à lunette tournante telle que définie par la revendication 1.To this end, the present invention relates to a watch case with a rotating bezel as defined by claim 1.

L'avantage de la solution proposée réside dans le fait qu'elle n'entraîne comme seules modifications un changement de la forme du ressort et, de préférence, la formation d'un second fraisage dans la bague fixe solidaire de la carrure.The advantage of the proposed solution lies in the fact that it does not cause as only modifications a change in the shape of the spring and, preferably, the formation of a second milling in the fixed ring integral with the middle part.

Le dessin annexé illustre en plus des figures 1 et 2 susmentionnées relatives à l'état de la technique, une forme d'exécution de la boîte de montre à lunette tournante objet de la présente invention.The appended drawing illustrates in addition to the above-mentioned FIGS. 1 and 2 relating to the state of the art, an embodiment of the watch case with rotating bezel which is the subject of the present invention.

La figure 3 est une vue en coupe d'une boîte de montre complète (valable pour l'état de la technique comme pour l'invention).Figure 3 is a sectional view of a complete watch case (valid for the state of the art as for the invention).

La figure 4 est une vue partielle de dessus sans l'anneau porteur des graduations, du seul mécanisme à lunette tournante de la boîte de la figure 3.FIG. 4 is a partial view from above, without the ring carrying the graduations, of the only rotating bezel mechanism of the box of FIG. 3.

Les figures 5 et 6 sont des vues en coupe respectivement selon les lignes V-V et VI-VI de la figure 4.Figures 5 and 6 are sectional views respectively along lines V-V and VI-VI of Figure 4.

Les figures 7 et 8 sont des vues semblables à la figure 4 montrant le comportement du ressort de positionnement de la lunette tournante dans chaque sens de rotation.Figures 7 and 8 are views similar to Figure 4 showing the behavior of the positioning spring of the rotating bezel in each direction of rotation.

Les figures 7a et 8a sont des vues partielles agrandies des figures 7 respectivement 8.Figures 7a and 8a are enlarged partial views of Figures 7 and 8 respectively.

La boîte de montre à lunette tournante illustrée par la figure 3 comporte une carrure 10, un fond 11 vissé dans la carrure, un joint d'étanchéité 12 entre le fond 11 et la carrure 10 et une glace 13 munie d'une gorge périphérique 14 dans laquelle une saillie latérale 15a d'un joint d'étanchéité annulaire 15 est engagé. Ce joint est serré entre une surface cylindrique 16 de la carrure 10 et une bague 17 chassée autour du joint d'étanchéité annulaire 15. Cette bague 17 comporte une face périphérique conique 17a sur laquelle vient se crocher une lunette tournante 18 qui comporte une face conique 18a correspondant à la face 17a. Un anneau plat élastique 19 prend appui par la partie de sa face inférieure adjacente à son bord interne, contre la bague fixe 17 et par la partie de sa face supérieure adjacente à son bord externe, contre la lunette tournante 18 et sert à appliquer élastiquement l'une contre l'autre les faces coniques 17a de la bague 17 et 18a de la lunette tournante 18. On constate que la lunette tournante 18 peut être déplacée axialement contre la carrure 10, à l'encontre de la pression de l'anneau plat élastique 19, permettant ainsi de séparer les faces coniques 17a et 18a l'une de l'autre et de faire tourner la lunette 18.The watch case with rotating bezel illustrated in FIG. 3 comprises a middle part 10, a bottom 11 screwed into the middle part, a seal 12 between the bottom 11 and the middle part 10 and a crystal 13 provided with a peripheral groove 14 in which a lateral projection 15a of an annular seal 15 is engaged. This seal is clamped between a cylindrical surface 16 of the middle part 10 and a ring 17 driven around the annular seal 15. This ring 17 has a conical peripheral face 17a on which is hooked a rotating bezel 18 which has a conical face 18a corresponding to the face 17a. An elastic flat ring 19 bears by the part of its lower face adjacent to its internal edge, against the fixed ring 17 and by the part of its upper face adjacent to its external edge, against the rotating bezel 18 and is used to apply elastically one against the other the conical faces 17a of the ring 17 and 18a of the rotating bezel 18. It is noted that the rotating bezel 18 can be moved axially against the middle part 10, at the against the pressure of the elastic flat ring 19, thus making it possible to separate the conical faces 17a and 18a from one another and to rotate the bezel 18.

Cette lunette tournante 18 comporte encore une portée supérieure 18b, sur laquelle est engagée à force un anneau 20 portant, par exemple, les graduations horaires. La partie de la lunette tournante 18 adjacente à la portée recevant l'anneau 20 s'étend vers l'intérieur. Une denture 21 est découpée dans cette partie de la lunette tournante 18.This rotating bezel 18 also has an upper reach 18b, on which is forcibly engaged a ring 20 carrying, for example, the hour markings. The part of the rotating bezel 18 adjacent to the scope receiving the ring 20 extends inward. A toothing 21 is cut in this part of the rotating bezel 18.

Comme le montrent les figures 4 à 6, outre cette denture 21, le dispositif de positionnement de la lunette tournante 18 comporte un ressort-fil 22 dont une extrémité coudée 22a (figure 5) est engagée dans une ouverture d'ancrage 23 de la bague fixe 17, et dont l'autre extrémité est doublement coudée en forme de V 22b pour s'engager dans la denture 21. Ce ressort-fil 22, qui s'étend sur à peu près ¼ de la circonférence de la lunette, présente trois segments distincts, deux segments pratiquement droits 22c, 22d adjacents respectivement aux extrémités 22a, 22b. Ces segments pratiquement droits 22c, 22d sont reliés l'un à l'autre par un segment 22e en arc de cercle. Le centre de cet arc de cercle est à l'intérieur de la bague 17, mais son rayon est plus petit que celui de la lunette tournante 18. Dans cet exemple, le rayon de courbure du segment 22e correspond à la moitié du rayon moyen de la lunette tournante 18. Les deux segments pratiquement droits 22c et 22d sont sensiblement tangents à un cercle centré sur l'axe central de la boîte. La matière utilisée pour réaliser le ressort-fil 22 est un alliage d'acier vendu sous la marque Nivaflex R et soumis à un traitement thermique conventionnel de 4 heures à 400°C.As shown in FIGS. 4 to 6, in addition to this toothing 21, the device for positioning the rotating bezel 18 comprises a wire spring 22, one bent end 22a (FIG. 5) being engaged in an anchoring opening 23 of the ring fixed 17, and the other end of which is doubly angled in the shape of a V 22b to engage in the toothing 21. This wire spring 22, which extends over approximately ¼ of the circumference of the telescope, has three separate segments, two practically straight segments 22c, 22d adjacent respectively to the ends 22a, 22b. These practically straight segments 22c, 22d are connected to each other by a segment 22e in an arc. The center of this circular arc is inside the ring 17, but its radius is smaller than that of the rotating bezel 18. In this example, the radius of curvature of segment 22e corresponds to half the mean radius of the rotating bezel 18. The two practically straight segments 22c and 22d are substantially tangent to a circle centered on the central axis of the case. The material used to make the wire spring 22 is an alloy of steel sold under the brand Nivaflex R and subjected to a conventional heat treatment for 4 hours at 400 ° C.

Deux fraisages 24 et 25 sont ménagés dans la partie annulaire interne 17b de la bague fixe 17, qui est aussi la partie de cette bague dont la hauteur est la plus grande. Le fraisage 24 est pratiquement tangent à un cercle centré sur l'axe central de la bague 17 et passe par le bord du trou 23 le plus proche de cet axe central. Ce fraisage 24 est aussi pratiquement parallèle au segment 22c du ressort-fil 22. Un dégagement 23a ménagé au droit du trou 23 permet l'introduction de l'extrémité 22a du ressort-fil 22 dans ce trou 23. L'autre fraisage 25 forme un arc de cercle centré sur l'axe central de la bague 17. Il sert d'appui à une partie du côté du segment 22d du ressort-fil 22 opposé à la denture 21, maintenant ainsi l'extrémité coudée 22b constamment élastiquement en prise avec la denture 21.Two millings 24 and 25 are provided in the internal annular part 17b of the fixed ring 17, which is also the part of this ring whose height is the greatest. Milling 24 is practically tangent to a circle centered on the central axis of the ring 17 and passes through the edge of the hole 23 closest to this central axis. This milling 24 is also practically parallel to the segment 22c of the wire spring 22. A clearance 23a formed in line with the hole 23 allows the introduction of the end 22a of the wire spring 22 into this hole 23. The other milling 25 forms an arc centered on the central axis of the ring 17. It serves to support a part of the side of the segment 22d of the wire spring 22 opposite the toothing 21, thus maintaining the bent end 22b constantly elastically engaged with teeth 21.

Examinons maintenant le comportement du ressort 22 dans chaque sens de rotation de la lunette tournante 18. La figure 7 montre en trait plein le ressort-fil 22 en position de repos avec son extrémité doublement coudée 22b, engagée entre deux dents de la denture 21. On a représenté en traits mixtes sur la figure 7a, la denture 21 entre deux positions angulaires stables lorsque la lunette tournante 18 est entraînée dans le sens des aiguilles de la montre (flèche FA). La force F3 qui s'exerce sur l'extrémité 22b du ressort-fil forme un angle aigu très faible avec le segment 22d du ressort-fil 22, de sorte que l'essentiel de cette force est transmis par le segment 22d au segment 22e en arc de cercle, le faisant fléchir vers l'extérieur. En même temps, le segment 22d bascule légèrement autour de son appui contre le fraisage 25, dans le sens contraire à celui des aiguilles de la montre, permettant le passage de la dent, après quoi l'extrémité coudée en V 22b pénètre à nouveau dans l'espace interdentaire suivant.Let us now examine the behavior of the spring 22 in each direction of rotation of the rotating bezel 18. FIG. 7 shows in solid lines the wire spring 22 in the rest position with its doubly bent end 22b, engaged between two teeth of the teeth 21. There is shown in phantom in Figure 7a, the toothing 21 between two stable angular positions when the rotating bezel 18 is driven in the clockwise direction (arrow F A ). The force F 3 which is exerted on the end 22b of the wire spring forms a very small acute angle with the segment 22d of the wire spring 22, so that most of this force is transmitted by the segment 22d to the segment 22nd in an arc, making it flex outwards. At the same time, the segment 22d swings slightly around its support against the milling 25, in the opposite direction to that of the hands of the watch, allowing the passage of the tooth, after which the bent end in V 22b again penetrates into the next interdental space.

Contrairement à ce qui se passe avec le ressort de positionnement de l'état de la technique (figures 1 et 2) où la force F1 doit faire fléchir un ressort-fil formant un très faible angle aigu avec la direction de la force appliquée, dans le cas de la présente invention, cette même force qui s'exerce presque dans l'axe du segment 22d sert à faire fléchir le segment arqué 22e. La force appliquée à ce segment arqué 22e par le segment 22d est sensiblement tangentielle à ce segment arqué 22e. De plus, celui-ci est relié au point d'ancrage constitué par l'ouverture 23, par le segment 22c, tangent à l'autre extrémité du segment 22e et qui est monté libre dans cette ouverture 23, de sorte que ceci revient à comprimer le segment arqué 22e en lui appliquant deux forces tangentielles de sens contraire à ses extrémités respectives. La force à exercer sur la lunette 18 est de ce fait sensiblement inférieure à celle que l'on doit exercer sur la lunette tournante 3 des figures 1 et 2 de l'état de la technique.Unlike what happens with the positioning spring of the state of the art (Figures 1 and 2) where the force F 1 must cause a wire spring to bend forming a very small acute angle with the direction of the force applied, in the case of the present invention, this same force which is exerted almost in the axis of the segment 22d serves to bend the arcuate segment 22e. The force applied to this arc segment 22e by the segment 22d is substantially tangential to this arc segment 22e. In addition, it is connected to the anchor point formed by the opening 23, by the segment 22c, tangent to the other end of the segment 22e and which is mounted freely in this opening 23, so that this amounts to compressing the arcuate segment 22e by applying to it two tangential forces of opposite direction at its respective ends. The force to be exerted on the bezel 18 is therefore substantially less than that which must be exerted on the rotating bezel 3 of Figures 1 and 2 of the prior art.

La figure 8 montre le comportement du ressort 22 lorsque la lunette tournante est entraînée dans le sens contraire à celui des aiguilles de la montre (flèche FR). Comme le montre le ressort 22 dessiné en traits mixtes et illustrant la position intermédiaire, la force F4 s'exerçant sur l'extrémité 22b tire cette extrémité dans le sens de rotation FR et provoque sur le segment arqué 22e une traction tangentielle qui ramène la courbure de ce segment vers le centre et provoque un basculement du segment 22d autour de son point d'appui contre le fraisage 25 dans le sens des aiguilles de la montre, augmentant ainsi la force à exercer sur la lunette 18 pour la faire tourner.FIG. 8 shows the behavior of the spring 22 when the rotating bezel is driven in the opposite direction to that of the watch hands (arrow F R ). As shown by the spring 22 drawn in dashed lines and illustrating the intermediate position, the force F 4 exerted on the end 22b pulls this end in the direction of rotation F R and causes on the arcuate segment 22e a tangential traction which brings back the curvature of this segment towards the center and causes tilting of the segment 22d around its fulcrum against the milling 25 in the clockwise direction, thereby increasing the force to be exerted on the bezel 18 to rotate it.

On peut donc constater que le ressort 22 permet de réduire la force nécessaire à l'entraînement de la lunette tournante 18 dans le sens des aiguilles de la montre (FA) et d'augmenter cette force lorsque cette lunette tournante 18 est entraînée en sens inverse (FR). Il est aussi possible, grâce à la forme du ressort 22, d'équilibrer finement la force nécessaire pour faire tourner la lunette dans les deux sens de rotation en agissant au besoin sur sa courbure.It can therefore be seen that the spring 22 makes it possible to reduce the force necessary for driving the rotating bezel 18 in the clockwise direction (F A ) and to increase this force when this rotating bezel 18 is driven in the direction inverse (F R ). It is also possible, thanks to the shape of the spring 22, to finely balance the force necessary to rotate the bezel in both directions of rotation by acting on its curvature if necessary.

Claims (2)

  1. A watch casing with a rotating bezel and an angular positioning device for the bezel, comprising a toothed rack means, a spring-wire means whose free end is resiliently and radially in engagement with said toothed rack means, the two parts of said spring wire means and said toothed rack means engaged together being formed to permit the displacement in angular steps of the bezel in both directions of rotation of the latter, one of said toothed rack means and said spring-wire means being integral with the rotating bezel and the other being integral with said casing, characterised in that said spring-wire means comprising two end segments that are substantially straight and tangential to an arc of a circle concentric with the axis of rotation of the rotating bezel and an intermediate curved segment having a centre of curvature located inside said bezel and a radius of curvature substantially less than the distance separating said curved segment from the axis of rotation of said rotating bezel, and said spring-wire means having a free end resiliently maintained in engagement with said toothed rack means by a support surface formed in said means integral with said other end of said spring-wire means and against which is applied a side opposite to said toothed rack means of a part of said end segment adjacent said free end of said spring-wire means.
  2. A watch casing as claimed in claim 1, characterised in that said means integral with said other end of said spring-wire means includes at least one positioning groove located in a same parallel plane and at the same height as the plane of the toothed rack and adapted to receive respectively at least a portion of said end segments, the base of the positioning groove receiving the segment adjacent the free end, constituting the said support surface.
EP95810365A 1994-06-09 1995-06-02 Watch case with a rotating bezel Expired - Lifetime EP0686897B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1815/94 1994-06-09
CH01815/94A CH686470B5 (en) 1994-06-09 1994-06-09 Box rotating bezel watch.

Publications (2)

Publication Number Publication Date
EP0686897A1 EP0686897A1 (en) 1995-12-13
EP0686897B1 true EP0686897B1 (en) 1997-08-27

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EP95810365A Expired - Lifetime EP0686897B1 (en) 1994-06-09 1995-06-02 Watch case with a rotating bezel

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US (1) US5541895A (en)
EP (1) EP0686897B1 (en)
CH (1) CH686470B5 (en)
DE (1) DE69500599T2 (en)

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JP2002182418A (en) * 2000-12-11 2002-06-26 Konica Corp Image forming method and image forming device
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JP4153378B2 (en) * 2003-07-14 2008-09-24 セイコーインスツル株式会社 clock
US7134784B1 (en) 2003-12-31 2006-11-14 James Marin Rotating bezel watch
EP1662342B1 (en) * 2004-11-26 2009-10-14 The Swatch Group Management Services AG Timepiece with interchangeable bezel
JP5127279B2 (en) * 2006-04-12 2013-01-23 王鼎精密股▲ふん▼有限公司 Clock assembly with world time zone display
JP4854587B2 (en) * 2007-05-02 2012-01-18 セイコーインスツル株式会社 clock
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EP2624076B1 (en) 2012-02-06 2014-12-31 Montres Tudor S.A. Watch case provided with a rotatable, indexed bezel
EP2672333A1 (en) * 2012-06-06 2013-12-11 Omega SA Rotating bezel system
EP2672332B1 (en) * 2012-06-06 2019-11-13 Omega SA Improved rotating bezel system
JP5943297B2 (en) * 2012-08-08 2016-07-05 カシオ計算機株式会社 Parting structure and clock
US20140098650A1 (en) * 2012-10-04 2014-04-10 Ball Watch Company Sa Revolving bezel system for a timepiece and timepiece comprising such a system
JP6741397B2 (en) * 2014-02-10 2020-08-19 ロレックス・ソシエテ・アノニムＲｏｌｅｘ Ｓａ Mobile watch side and watch
EP3543799B1 (en) * 2018-03-20 2023-05-17 Omega SA Annular ring for holding a rotating bezel system
EP3608730B1 (en) * 2018-08-08 2021-05-05 Omega SA Annular rotating bezel system comprising a spring ring provided with at least two lugs
JP2022099298A (en) 2020-12-22 2022-07-04 ロレックス・ソシエテ・アノニム Spring for notching system and timepiece notching system
JP2022099297A (en) 2020-12-22 2022-07-04 ロレックス・ソシエテ・アノニム Spring for notching system and timepiece notching system

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Also Published As

Publication number Publication date
DE69500599T2 (en) 1998-02-05
DE69500599D1 (en) 1997-10-02
US5541895A (en) 1996-07-30
EP0686897A1 (en) 1995-12-13
CH686470GA3 (en) 1996-04-15
CH686470B5 (en) 1996-10-15

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