EP3582029B1 - Fly-back hand mechanism and chronograph comprising such a mechanism - Google Patents
Fly-back hand mechanism and chronograph comprising such a mechanism Download PDFInfo
- Publication number
- EP3582029B1 EP3582029B1 EP18177764.0A EP18177764A EP3582029B1 EP 3582029 B1 EP3582029 B1 EP 3582029B1 EP 18177764 A EP18177764 A EP 18177764A EP 3582029 B1 EP3582029 B1 EP 3582029B1
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- European Patent Office
- Prior art keywords
- transverse arm
- split
- fly
- back hand
- wheel
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- 230000007246 mechanism Effects 0.000 title claims description 71
- 230000008859 change Effects 0.000 claims description 5
- 210000003323 beak Anatomy 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
- G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
- G04F7/08—Watches or clocks with stop devices, e.g. chronograph
- G04F7/0866—Special arrangements
- G04F7/0876—Split-time function, e.g. rattrappante
Definitions
- the present invention relates to a split-seconds mechanism for a chronograph comprising a control device comprising a manually operated mechanism accessible from outside the chronograph and at least one movable part arranged to selectively occupy two predefined configurations and to switch alternately from one to the other. the other of the two predefined configurations when the control device is switched using the manual control mechanism, and comprising a split-seconds clamp actuated by said at least one movable part and the two branches of which are arranged to cooperate with a wheel split-seconds wheel coaxial with a chronograph wheel, so as to alternately allow the split-seconds wheel to be released and immobilized by switching the control device so as to alternately open and close the split-seconds clamp.
- the present invention also relates to a chronograph equipped with such a split-seconds mechanism.
- FIG. 1 Annexed is taken from http // www.horlogerie-suisse.com. It illustrates a split-second mechanism of the prior art.
- This mechanism comprises a control device comprising a column wheel A formed by a ratchet with sixteen teeth surmounted by eight columns (not referenced), a jumper D, a rocker C intended to be actuated from outside a chronograph, and a hook B articulated on one end of the rocker C.
- the hook B is biased by a spring (not shown) against the ratchet of the column wheel.
- the column wheel A can be actuated in rotation by a pusher via the rocker C and the hook D which cooperates with the ratchet.
- the column wheel thus advances step by step in the clockwise direction, and the jumper D ensures that the angular value of each step corresponds to that of a tooth of the ratchet.
- the rattrapante mechanism of the figure 1 also includes a split-seconds wheel G designed to be mounted loose coaxially with the chronograph wheel, a lever J pivoted on the rim of the split-seconds wheel, a lever spring K fixed by one of its ends to the rim of the split-seconds, and a heart (not visible) mounted fixed on the chronograph wheel in coaxial position.
- the lever J is arranged so as to be biased by the spring K against the heart.
- the split-second mechanism illustrated comprises a split-second clip which comprises two rockers E and F and a double spring H. With further reference to the figure 1 , it can be seen that the two rockers are arranged symmetrically and are each formed of a first and a second arm.
- the first arms both end in a spout arranged to cooperate with the columns of the column wheel A, while the second arms constitute the two branches of the split-seconds clamp.
- the two elastic leaves of the double spring H are arranged so as to recall the two branches, one in the direction of the other, so as to tend to close the clamp around the split-seconds wheel G.
- the column wheel As the column wheel has eight columns, it must advance twice the angular value of one tooth of the ratchet for a column to take the place of the previous one. It will therefore be understood that, when the column wheel advances step by step, the slats of the two rockers E and F are alternately lifted by a column, then released in the space between this column and the next, so that the advance of the column wheel A causes a succession of openings and closings of the split-seconds clamp, so as to alternately release and immobilize the split-seconds wheel. To immobilize the split-seconds wheel G with precision, it is important that the two branches of the clamp come into contact with the wheel at the same time.
- the document EP 0 490 285 A1 describes a split-second mechanism which corresponds to the definition given in the preamble and of which the clamp, which comprises two branches and an elastic connection portion, is in one piece.
- the split-seconds clamp can assume a first configuration, called closed, in which the elastic connection portion which connects the two branches is rectilinear so that the fly-back wheel is immobilized, and a so-called open configuration, in which the connecting portion is curved so that the rattrapante wheel is free to turn.
- the moving part is arranged to alternately deform and move away from the connecting portion when the control device is actuated repeatedly.
- a drawback of this known mechanism is that the split-seconds clamp must be fixed to the plate with play, which limits its precision.
- An aim of the present invention is to remedy the drawbacks of the prior art which have just been explained.
- the present invention achieves this and other object by providing a split-seconds mechanism according to claim 1 appended hereto.
- the split-seconds clamp comes in a single piece which comprises the following parts: two branches and an elastic transverse arm deformable in bending which connects the two branches to one another and which is provided with its ends of two pivot members arranged to rotate about two parallel axes.
- an elastic transverse arm deformable in bending which connects the two branches to one another and which is provided with its ends of two pivot members arranged to rotate about two parallel axes.
- the elastic transverse arm extends between the two pivot members.
- the distance which separates the two pivot members is less than the non-deformed length of the elastic transverse arm.
- the elastic transverse arm is subjected to stresses which make its undeformed configuration unstable.
- the elastic transverse arm adopts a buckled shape (or in other words, bent by deformation in a direction perpendicular to the plane containing the two parallel axes around which the two pivot members are arranged to rotate).
- the expression “stable configuration” is understood to mean a configuration which is associated with a shape towards which the elastic transverse arm always returns if it is moved away from it by a stress of sufficiently low amplitude.
- the movable part is arranged to cooperate with the elastic transverse arm so that, when the control device is switched, the passage of the movable part from one of its two configurations to the other or preset positions changes the curvature of the elastic transverse arm, so as to alternately open and close the split-seconds clamp.
- the curvature due to buckling can constitute a deformation in one direction or the other of the transverse arm, so that the elastic transverse arm, and by extension the split-seconds clamp as a whole, has two stable configurations towards which they tend to return. when they are removed by a stress of sufficiently low amplitude.
- the split-seconds mechanism comprises a split-seconds wheel designed to be arranged coaxially with the chronograph wheel of the chronograph.
- the two branches of the split-second clip are arranged to cooperate with the split-second wheel so that the flywheel split-seconds is immobilized or free to rotate depending on whether the split-seconds clamp is closed or open respectively.
- the figures 2A and 2B are schematic plan views of a split-second mechanism according to a first particular embodiment of the invention.
- the split-seconds mechanism shown is intended to equip a chronograph mechanism which may be of conventional design.
- a chronograph mechanism comprises in particular a chronograph wheel and a chronograph hand connected by a chronograph axis.
- the axis of the chronograph wheel still carries a heart which is part of the split-seconds mechanism.
- the split-seconds heart, nor the chronograph components which have just been listed will be described in more detail. Those skilled in the art will however understand that these elements, which do not appear in the figures either, can be produced in a traditional manner.
- the split-second mechanism illustrated comprises a split-seconds wheel 3 which is designed to be mounted loose coaxially with the chronograph wheel and whose axis (not shown) is designed to be arranged concentrically with the chronograph axis and to wear in a conventional manner a split-seconds needle (not shown).
- the split-second mechanism illustrated further comprises a split-seconds column wheel 5 and a control lever 7.
- the control lever 7 is pivoted about an axis 9 and it comprises a spout 11 which is biased against the columns of the wheel. split-seconds columns by a spring 13.
- the spring 13 is integral with the control lever 7.
- the split-seconds column wheel 5 is itself controlled using a manually operated mechanism (not shown) accessible from outside the chronograph watch. the manually operated mechanism can, in the traditional way, be operated using a push-button.
- the split-second mechanism illustrated further comprises a split-second clip 19 made from a single bent piece.
- this bent part is formed of two branches 21a and 21b arranged to pass on either side of the split-seconds wheel 3, of an elastic transverse arm 23 which connects the two branches to one another, and two pivot members 25a and 25b each formed at the junction between one of the two branches 21a, 21b and the corresponding end of the elastic transverse arm 23.
- the two pivot members 25a, 25b are free to rotate around two parallel axes (not shown) which are oriented perpendicular to the plane of the drawing.
- the split-seconds clamp 19 is arranged to be controlled by the split-seconds column wheel 5 via the control lever 7.
- control lever 7 also comprises a control arm 15 which ends with a head which, in the example illustrated, carries two parallel pins 17a and 17b which are oriented perpendicular to the plane of the drawing.
- a control arm 15 which ends with a head which, in the example illustrated, carries two parallel pins 17a and 17b which are oriented perpendicular to the plane of the drawing.
- the distance which separates the two parallel axes around which the two pivot members 25a and 25b rotate is less than the undeformed length of the elastic transverse arm 23.
- the elastic transverse arm is subjected to stresses which make its undeformed configuration unstable.
- the elastic transverse arm 23 adopts a buckled shape (or in other words, bent by deformation in a direction parallel to the plane of the drawing).
- stable configuration is understood to mean a configuration which is associated with a shape towards which the elastic transverse arm always returns if it is moved away from it by a stress of sufficiently low amplitude.
- the elastic transverse arm 23 has been shown in the two figures, giving it a convex shape towards the left of the drawing.
- the elastic transverse arm is curved, and the concavity of this curve is to the right in the drawing, that is to say open towards the split-seconds wheel.
- the concavity of the elastic transverse arm is more marked in the figure 2B that in the figure 2A .
- the configuration illustrated in figure 2B corresponds to the stable configuration of the split-seconds clamp 19 and more generally of the entire split-seconds mechanism of the present embodiment.
- the figure 2A illustrates a split-second clamp configuration that is unstable. In other words, the elastic transverse arm 23 cannot remain in the position illustrated by figure 2A that as long as the pin 17a of the control arm 15 retains it, preventing it from fully buckling.
- the transverse arm 23 of the clamp 19 is elastic, or more precisely, the elasticity of the branches 21a, 21b and of the pivot members 25a, 25b of the split-seconds clamp can be considered negligible in comparison with that of the transverse arm.
- the angle which each of the branches 21a, 21b of the clamp 19 makes with the elastic transverse arm 23, at the level of the pivoting member 25a or 25b which connects them does not change when the elastic transverse arm is deformed.
- the more the shape of the elastic transverse arm 23 is curved towards the left (in the drawing), the more the branches of the split-seconds clamp 19 are brought together.
- the presence of the buckled elastic transverse arm therefore offers the possibility of making the two branches 21a, 21b move apart and closer together by varying the curvature of the elastic transverse arm 23.
- the split-second mechanism comprises a control device comprising a manually operated mechanism accessible from outside the chronograph case and at least one moving part arranged to selectively occupy two predefined configurations and to switch alternately from one to the other of the two predefined configurations when the control device is switched using of the manually operated mechanism.
- the manually operated mechanism is preferably constituted by a push-button mechanism (not shown) arranged to rotate the column wheel 5 step by step in the clockwise direction, and the control rocker 7 fulfills the purpose.
- movable part function arranged to selectively occupy two predefined configurations or positions.
- the control rocker 7 is in fact arranged to switch alternately in one direction and the other between two predefined angular positions when the column wheel 5 is incremented step by step.
- the elastic transverse arm 23 is guided between the two pins 17a, 17b of the rocker 7, it is forced to accompany the movements of the control arm 15 of the control rocker 7 by bending, so that its curvature varied.
- the spout 11 of the control lever 7 is found between two columns of the column wheel.
- the spout 11 is then free to lower into the space between the columns under the action in particular of the return spring 13, so that the control lever 7 pivots clockwise.
- the pivoting of the control lever 7 in the clockwise direction has the effect of returning the pins 17a, 17b to their starting point. In doing so, the pin 17a stops retaining the elastic transverse arm which is thus free to return to its equilibrium configuration by deforming to the left (in the drawing).
- the elastic transverse arm 23 thus resumes its more strongly curved shape towards the left (in the drawing), so that the branches 21a, 21b of the split-seconds clamp 19 close on the split-seconds wheel 3.
- the split-seconds clamp is capable of spontaneously returning to the configuration of the figure 2A to that of figure 2B . Under these conditions, when the transverse arm 23 is deformed, it pushes back the pin 17a and therefore the lever 7 in the direction of the column wheel.
- the figures 3A and 3B are schematic plan views of a split-second mechanism according to a second exemplary embodiment of the invention. As these figures show, the illustrated split-second mechanism has many characteristics in common with the split-second mechanism of figures 2A and 2B . This is the reason why the following description will be limited to describing the characteristics of the second embodiment which have not already been described in relation to the first embodiment. It should also be noted that the elements of the split-seconds mechanism illustrated in the figures 3A and 3B , which are identical or equivalent to parts of the split-second mechanism illustrated in the figures 2A and 2B , are designated by the same reference numbers added to one hundred.
- the elastic transverse arm 123 has been shown by giving it a convex shape to the right in the figure 3A and curved to the left in the figure 3B . It will be understood that the embodiment of figures 3A and 3B takes advantage of the resilient transverse arm's ability to adopt either a buckled shape in one direction or the other (or in other words, a shape curved by deformation in one direction or the other parallel to the plane of the drawing) . Indeed, the elastic transverse arm 123, associated with the two pivot members 125a, 125b which hold its ends, constitutes a bistable device, or in other words, a device which can adopt one or the other of two stable configurations.
- the elastic transverse arm 123 is guided between two pins 117a, 117b of the control arm 115 of the rocker 107.
- the elastic transverse arm is therefore forced to accompany the movements of the lever.
- control arm 115 by deforming in a direction which is perpendicular to a plane containing the two parallel pivot axes.
- the elastic cross arm 123 has two stable configurations; a first configuration in which the transverse arm 123 is buckled to the left ( Figure 3B ) and a second configuration in which the transverse arm 123 is buckled to the right ( Figure 3A ).
- first configuration in which the transverse arm 123 is buckled to the left ( Figure 3B )
- second configuration in which the transverse arm 123 is buckled to the right ( Figure 3A ).
- the control lever 115 pivots from one of its two predefined configurations to the other, the amplitude of the movement of the control arm 115 and the two pins 117a, 117b is sufficient to completely tilt the resilient cross arm from its first to its second stable configuration.
- the transverse arm 123 deforms so as to deviate from the first stable configuration and to approach the second.
- the transverse arm being elastic, its deformation also generates a reaction force which, initially, opposes the deformation of the transverse arm and therefore tends to return it to the first stable configuration.
- the pin 117a moves the cross arm 123 past a point which is just as close to the second stable configuration as to the first, the direction of the reaction force is reversed, so that 'From this point of reversal, the reaction force no longer opposes the pin 117a, but instead drives the resilient transverse arm 123 towards the second stable configuration.
- the beak 111 of the control lever 107 is found between two columns of the column wheel. Under the action of the return spring 113, the spout 111 then lowers into the space between the columns, so that the control lever 107 pivots clockwise.
- the pivoting of the control lever 107 in the clockwise direction has the effect of returning the pins 117a, 117b in the direction of their starting point. In doing so, the pin 117b abuts against the elastic transverse arm 123 which it forces to deform so as to deviate from the second stable configuration.
- the deformation of the transverse arm 123 generates a reaction force which, initially, opposes the deformation of the arm and therefore tends to recall the latter in the second configuration. stable.
- the spring 113 in order to rotate the lever 107 in the clockwise direction, the spring 113 must be strong enough to overcome the reaction force which, initially, tends to return the elastic transverse arm to its second stable configuration.
- the pin 117b causes the resilient transverse arm 123 to tilt from its second to its first stable configuration. The latter therefore resumes the configuration of the figure 3B .
- This passage of the elastic transverse arm 123 from a configuration buckled to the right to a configuration buckled to the left also has the effect of closing the branches 121a, 121b of the flyback clamp 119 on the flyback wheel 103.
- the figures 4A and 4B are schematic plan views of a split-second mechanism according to a third exemplary embodiment of the invention. As these figures show, the split-second mechanism illustrated has many characteristics in common with the two split-second mechanisms already described. This is the reason why the The following description will be limited to describing those of the characteristics of the third embodiment which distinguish it from the first two embodiments. It should also be noted that the elements of the split-seconds mechanism illustrated in the figures 4A and 4B , which are identical or equivalent to parts of the split-second mechanism illustrated in the figures 2A and 2B , are designated by the same reference numbers added to two hundred.
- the split-second mechanism illustrated differs from the two preceding examples in particular by the fact that it does not include a control lever, and that the column wheel 205 is arranged to directly control the split-seconds clamp 219.
- the split-second mechanism comprises a control device comprising a manual mechanism accessible from outside the chronograph case and at least one movable part arranged to be selectively in two predefined configurations and to pass alternately from there. 'one to the other of the two predefined configurations when the controller is switched using the manually operated mechanism.
- the column wheel 205 is formed by an eight-tooth ratchet surmounted by four columns together forming a cross-shaped cam (referenced 207) which has a rotational symmetry of order 4.
- the column wheel 205 is rotated by the angular value of a tooth of the ratchet (in the example illustrated, this pivoting appears to be accomplished in the clockwise direction when the wheel at columns and top view).
- This one-eighth turn rotation performed by the column wheel 205 has the effect of changing the angular position of the cross cam 207 so as to change the cross cam from a first configuration to a second configuration.
- the column wheel 205 is a two-stroke column wheel. Under these conditions, if the manually operated mechanism is actuated a second time, this new rotation of the column wheel, in the same direction as the previous one, has the effect of resetting the cross cam 207 from its second configuration to its first setup.
- the first configuration is the configuration shown in the figure 4A . In the first configuration, the end of one of the branches is turned towards the flexible transverse arm 223 of the flyback clamp 219, so that it presses against the flexible transverse arm.
- the second configuration is shown in the figure 4B . In the second configuration, no branch of the cross is turned towards the flexible transverse arm 223.
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Description
La présente invention concerne un mécanisme de rattrapante pour chronographe comprenant un dispositif de commande comportant un mécanisme à commande manuelle accessible de l'extérieur du chronographe et au moins une pièce mobile agencée pour occuper sélectivement deux configurations prédéfinies et pour passer alternativement de l'une à l'autre des deux configurations prédéfinies lorsque le dispositif de commande est commuté à l'aide du mécanisme à commande manuelle, et comportant une pince de rattrapante actionnée par ladite au moins une pièce mobile et dont les deux branches sont agencées pour coopérer avec une roue de rattrapante coaxiale avec une roue de chronographe, de manière à permettre alternativement de libérer et d'immobiliser la roue de rattrapante en commutant le dispositif de commande de façon à faire alternativement s'ouvrir et se refermer la pince de rattrapante. La présente invention concerne également un chronographe équipé d'un tel mécanisme de rattrapante.The present invention relates to a split-seconds mechanism for a chronograph comprising a control device comprising a manually operated mechanism accessible from outside the chronograph and at least one movable part arranged to selectively occupy two predefined configurations and to switch alternately from one to the other. the other of the two predefined configurations when the control device is switched using the manual control mechanism, and comprising a split-seconds clamp actuated by said at least one movable part and the two branches of which are arranged to cooperate with a wheel split-seconds wheel coaxial with a chronograph wheel, so as to alternately allow the split-seconds wheel to be released and immobilized by switching the control device so as to alternately open and close the split-seconds clamp. The present invention also relates to a chronograph equipped with such a split-seconds mechanism.
On connait déjà des mécanismes de rattrapante qui correspondent à la définition ci-dessus. La
Le mécanisme de rattrapante de la
La roue à colonnes comptant huit colonnes, il faut qu'elle avance deux fois de la valeur angulaire d'une dent du rochet pour qu'une colonne prenne la place de la précédente. On comprendra donc que, lorsque la roue à colonnes avance pas à pas, les becs des deux bascules E et F sont alternativement soulevés par une colonne, puis relâchés dans l'espace entre cette colonne et la suivante, de sorte que l'avance de la roue à colonnes A provoque une succession d'ouvertures et de fermetures de la pince de rattrapante, de manière à libérer et à immobiliser alternativement la roue de rattrapante. Pour immobiliser la roue de rattrapante G avec précision, il est important que les deux branches de la pince viennent en contact avec la roue au même instant. Avec une construction comme celle montrée dans la
Le document
Un but de la présente invention est de remédier aux inconvénients de l'art antérieur qui viennent d'être expliqués. La présente invention atteint ce but ainsi que d'autres en fournissant un mécanisme de rattrapante conforme à la revendication 1 annexée.An aim of the present invention is to remedy the drawbacks of the prior art which have just been explained. The present invention achieves this and other object by providing a split-seconds mechanism according to claim 1 appended hereto.
Conformément à l'invention, la pince de rattrapante vient d'une seule pièce qui comprend les parties suivantes : deux branches et un bras transversal élastique déformable en flexion qui relie les deux branches l'une à l'autre et qui est muni à ses extrémités de deux organes de pivotement agencés pour tourner autour de deux axes parallèles. On comprendra notamment que le caractère élastique et déformable en flexion du bras transversal donne la possibilité de faire s'écarter et se rapprocher les deux branches de la pince de rattrapante en appliquant une contrainte sur le bras transversal de manière à le déformer en flexion.According to the invention, the split-seconds clamp comes in a single piece which comprises the following parts: two branches and an elastic transverse arm deformable in bending which connects the two branches to one another and which is provided with its ends of two pivot members arranged to rotate about two parallel axes. It will be understood in particular that the elastic and flexibly deformable nature of the transverse arm makes it possible to move the two branches of the split-second clamp apart and approach each other by applying a stress to the transverse arm so as to deform it in flexion.
Comme on l'a vu, le bras transversal élastique s'étend entre les deux organes de pivotement. De plus, conformément à l'invention, la distance qui sépare les deux organes de pivotement est inférieure à la longueur non-déformée du bras transversal élastique. Dans ces conditions, de façon connue en soi, le bras transversal élastique subit des contraintes qui rendent instable sa configuration non déformée. Dans ces conditions, pour retrouver une configuration stable dans laquelle les contraintes sont réduites, le bras transversal élastique adopte une forme flambée (ou autrement dit, courbée par déformation dans une direction perpendiculaire au plan contenant les deux axes parallèles autour desquels les deux organes de pivotement sont agencés pour tourner). On précisera qu'on entend par l'expression « configuration stable », une configuration qui est associée à une forme vers laquelle le bras transversal élastique revient toujours si on l'en écarte par une sollicitation de suffisamment faible amplitude.As we have seen, the elastic transverse arm extends between the two pivot members. In addition, according to the invention, the distance which separates the two pivot members is less than the non-deformed length of the elastic transverse arm. Under these conditions, in a manner known per se, the elastic transverse arm is subjected to stresses which make its undeformed configuration unstable. Under these conditions, to find a stable configuration in which the stresses are reduced, the elastic transverse arm adopts a buckled shape (or in other words, bent by deformation in a direction perpendicular to the plane containing the two parallel axes around which the two pivot members are arranged to rotate). It will be noted that the expression “stable configuration” is understood to mean a configuration which is associated with a shape towards which the elastic transverse arm always returns if it is moved away from it by a stress of sufficiently low amplitude.
Conformément à l'invention toujours, la pièce mobile est agencée pour coopérer avec le bras transversal élastique de façon que, lorsque le dispositif de commande est commuté, le passage de la pièce mobile de l'une à l'autre de ses deux configurations ou positions prédéfinies fait changer la courbure du bras transversal élastique, de manière à faire alternativement s'ouvrir et se refermer la pince de rattrapante.Still according to the invention, the movable part is arranged to cooperate with the elastic transverse arm so that, when the control device is switched, the passage of the movable part from one of its two configurations to the other or preset positions changes the curvature of the elastic transverse arm, so as to alternately open and close the split-seconds clamp.
La courbure due au flambage peut constituer une déformation dans un sens ou dans l'autre du bras transversal, de sorte que le bras transversal élastique, et par extension la pince de rattrapante dans son ensemble, possède deux configurations stables vers lesquelles ils tendent à revenir lorsqu'on les en écarte par une sollicitation de suffisamment faible amplitude.The curvature due to buckling can constitute a deformation in one direction or the other of the transverse arm, so that the elastic transverse arm, and by extension the split-seconds clamp as a whole, has two stable configurations towards which they tend to return. when they are removed by a stress of sufficiently low amplitude.
Conformément à l'invention, le mécanisme de rattrapante comprend une roue de rattrapante prévue pour être agencée coaxialement à la roue de chronographe du chronographe. Les deux branches de la pince de rattrapante sont agencées pour coopérer avec la roue de rattrapante de façon que la roue de rattrapante soit immobilisée ou libre de tourner selon que la pince de rattrapante est respectivement fermée ou ouverte.According to the invention, the split-seconds mechanism comprises a split-seconds wheel designed to be arranged coaxially with the chronograph wheel of the chronograph. The two branches of the split-second clip are arranged to cooperate with the split-second wheel so that the flywheel split-seconds is immobilized or free to rotate depending on whether the split-seconds clamp is closed or open respectively.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés dans lesquels :
- la
figure 1 est une vue schématique en plan d'un mécanisme de rattrapante de l'art antérieur ; - la
figure 2A est une vue schématique en plan de dessus d'un mécanisme de rattrapante conforme à un premier mode de réalisation particulier de l'invention, le mécanisme de rattrapante étant montré avec la pince de rattrapante ouverte ; - la
figure 2B est une vue schématique en plan de dessus du mécanisme de rattrapante de lafigure 2A , lafigure 2B montrant le mécanisme de rattrapante avec la pince de rattrapante refermée sur la roue de rattrapante ; - la
figure 3A est une vue schématique en plan de dessus d'un mécanisme de rattrapante conforme à un deuxième mode de réalisation particulier de l'invention, le mécanisme de rattrapante étant montré avec la pince de rattrapante ouverte ; - la
figure 3B est une vue schématique en plan de dessus du mécanisme de rattrapante de lafigure 3A , lafigure 3B montrant le mécanisme de rattrapante avec la pince de rattrapante refermée sur la roue de rattrapante ; - la
figure 4A est une vue schématique en plan de dessus d'un mécanisme de rattrapante conforme à un troisième mode de réalisation particulier de l'invention, le mécanisme de rattrapante étant montré avec la pince de rattrapante ouverte ; - la
figure 4B est une vue schématique en plan de dessus du mécanisme de rattrapante de lafigure 4A , lafigure 4B montrant le mécanisme de rattrapante avec la pince de rattrapante refermée sur la roue de rattrapante.
- the
figure 1 is a schematic plan view of a split-seconds mechanism of the prior art; - the
figure 2A is a schematic top plan view of a split-second mechanism according to a first particular embodiment of the invention, the split-second mechanism being shown with the split-second clip open; - the
figure 2B is a schematic top plan view of the split-seconds mechanism of thefigure 2A , thefigure 2B showing the split-seconds mechanism with the split-seconds clamp closed on the split-seconds wheel; - the
figure 3A is a schematic top plan view of a split-second mechanism according to a second particular embodiment of the invention, the split-second mechanism being shown with the split-second clip open; - the
figure 3B is a schematic top plan view of the split-seconds mechanism of thefigure 3A , thefigure 3B showing the split-seconds mechanism with the split-seconds clamp closed on the split-seconds wheel; - the
figure 4A is a schematic top plan view of a split-second mechanism according to a third particular embodiment of the invention, the split-second mechanism being shown with the split-second clip open; - the
figure 4B is a schematic top plan view of the split-seconds mechanism of thefigure 4A , thefigure 4B showing the split-seconds mechanism with the split-seconds clamp closed on the split-seconds wheel.
Les
En se référant à nouveau aux
Le mécanisme de rattrapante illustré comprend encore une pince de rattrapante 19 faite d'une seule pièce coudée. Comme illustré, cette pièce coudée est formée de deux branches 21a et 21b agencées pour passer de part et d'autre de la roue de rattrapante 3, d'un bras transversal élastique 23 qui relie les deux branches l'une à l'autre, et de deux organes de pivotement 25a et 25b formés chacun à la jonction entre une des deux branches 21a, 21b et l'extrémité correspondante du bras transversal élastique 23. Les deux organes de pivotement 25a, 25b sont libres de tourner autour de deux axes parallèles (non représentés) qui sont orientés perpendiculairement au plan du dessin. La pince de rattrapante 19 est agencée pour être commandée par la roue à colonnes de rattrapante 5 par l'intermédiaire de la bascule de commande 7. A cet effet, la bascule de commande 7 (déjà mentionnée) comporte encore un bras de commande 15 qui se termine par une tête qui, dans l'exemple illustré, porte deux goupilles parallèles 17a et 17b qui sont orientées perpendiculairement au plan du dessin. On peut voir sur les
Conformément à l'invention, la distance qui sépare les deux axes parallèles autour desquels tournent les deux organes de pivotement 25a et 25b est inférieure à la longueur non-déformée du bras transversal élastique 23. Dans ces conditions, de façon connue en soi, le bras transversal élastique subit des contraintes qui rendent instable sa configuration non déformée. Pour retrouver une configuration stable dans laquelle les contraintes sont réduites, le bras transversal élastique 23 adopte une forme flambée (ou autrement dit, courbée par déformation dans une direction parallèle au plan du dessin). Par l'expression « configuration stable » on entend une configuration qui est associée à une forme vers laquelle le bras transversal élastique revient toujours si on l'en écarte par une sollicitation de suffisamment faible amplitude.According to the invention, the distance which separates the two parallel axes around which the two
En se référant toujours aux
On notera enfin que, dans le présent mode de réalisation, seul le bras transversal 23 de la pince 19 est élastique, ou plus précisément, l'élasticité des branches 21a, 21b et des organes de pivotement 25a, 25b de la pince de rattrapante peut être considérée comme négligeable en comparaison avec celle du bras transversal. Dans ces conditions, l'angle que fait chacune des branches 21a, 21b de la pince 19 avec le bras transversal élastique 23, au niveau de l'organe de pivotement 25a ou 25b qui les relie, ne change pas lorsque le bras transversal élastique se déforme. Dans ces conditions, on comprendra que plus la forme du bras transversal élastique 23 est bombée vers la gauche (sur le dessin), plus les branches de la pince de rattrapante 19 sont rapprochées l'une de l'autre. La présence du bras transversal élastique flambé offre donc la possibilité de faire s'écarter et se rapprocher les deux branches 21a, 21b en faisant varier la courbure du bras transversal élastique 23.Finally, it will be noted that, in this embodiment, only the
Conformément à l'invention, le mécanisme de rattrapante comprend un dispositif de commande comportant un mécanisme à commande manuelle accessible de l'extérieur de la boîte du chronographe et au moins une pièce mobile agencée pour occuper sélectivement deux configurations prédéfinies et pour passer alternativement de l'une à l'autre des deux configurations prédéfinies lorsque le dispositif de commande est commuté à l'aide du mécanisme à commande manuelle. Dans le présent exemple, le mécanisme à commande manuelle est de préférence constitué par un mécanisme à poussoir (non représenté) agencé pour faire tourner la roue à colonnes 5 pas-à-pas dans le sens horaire, et la bascule de commande 7 remplit la fonction de pièce mobile agencée pour occuper sélectivement deux configurations ou positions prédéfinies. La bascule de commande 7 est en effet agencée pour commuter alternativement dans un sens et dans l'autre entre deux positions angulaires prédéfinies lorsque la roue à colonnes 5 est incrémentée pas-à-pas. De plus, comme le bras transversal élastique 23 est guidé entre les deux goupilles 17a, 17b de la bascule 7, il est forcé d'accompagner les mouvements du bras de commande 15 de la bascule de commande 7 en fléchissant, de sorte que sa courbure varie.According to the invention, the split-second mechanism comprises a control device comprising a manually operated mechanism accessible from outside the chronograph case and at least one moving part arranged to selectively occupy two predefined configurations and to switch alternately from one to the other of the two predefined configurations when the control device is switched using of the manually operated mechanism. In the present example, the manually operated mechanism is preferably constituted by a push-button mechanism (not shown) arranged to rotate the
Lorsqu'en pivotant de la valeur angulaire d'un pas, la roue à colonnes 5 passe de la configuration illustrée dans la
Lorsque la roue à colonnes 5 est ensuite incrémentée d'un pas de plus, et qu'elle repasse de la configuration illustrée dans la
Les
En se référant aux
Comme s'était déjà le cas dans le premier mode de réalisation, le bras transversal élastique 123 est guidé entre deux goupilles 117a, 117b du bras de commande 115 de la bascule 107. Le bras transversal élastique est donc forcé d'accompagner les mouvements du bras de commande 115 en se déformant dans une direction qui est perpendiculaire à un plan contenant les deux axes de pivotement parallèles.As was already the case in the first embodiment, the elastic
Lorsqu'en pivotant de la valeur angulaire d'un pas, la roue à colonnes 105 passe de la configuration illustrée dans la
Lorsque la goupille 117a repousse le bras transversal élastique 123 en direction de la roue de rattrapante 103, le bras transversal 123 se déforme de manière à s'écarter de la première configuration stable et à se rapprocher de la seconde. Le bras transversal étant élastique, sa déformation engendre également une force de réaction qui, dans un premier temps, s'oppose à la déformation du bras transversal et tend donc à le rappeler dans la première configuration stable. Toutefois, une fois que la goupille 117a a amené le bras transversal 123 au-delà d'un point qui est tout aussi proche de la seconde configuration stable que de la première, le sens de la force de réaction s'inverse, de sorte qu'à partir de ce point d'inversion, la force de réaction ne s'oppose plus à la goupille 117a, mais entraîne au contraire le bras transversal élastique 123 en direction de la seconde configuration stable. L'homme du métier comprendra que l'existence d'un point d'inversion, au niveau duquel le sens de la force de réaction exercée par le bras transversal élastique s'inverse, découle du caractère bistable du dispositif constitué par le bras transversal élastique 123 et les deux organes de pivotement 125a, 125b qui lui sont associés.When the
Ainsi, lorsque la roue à colonnes de rattrapante 105 se trouve dans la configuration de la
Lorsque la roue à colonnes 105 est ensuite incrémentée d'un pas de plus, et qu'elle repasse de la configuration illustrée dans la
Les
En se référant aux
En se référant toujours aux
On aura noté par ailleurs que la roue à colonnes 205 est une roue à colonnes à deux temps. Dans ces conditions, si on actionne le mécanisme à commande manuelle une deuxième fois, cette nouvelle rotation de la roue à colonnes, dans le même sens que la précédente, a pour effet de refaire passer la came en croix 207 de sa seconde configuration à sa première configuration. La première configuration est la configuration représentée dans la
On comprendra en outre que diverses modifications et/ou améliorations évidentes pour un homme du métier peuvent être apportées au mode de réalisation qui fait l'objet de la présente description sans sortir du cadre de la présente invention définie par les revendications annexées.It will also be understood that various modifications and / or improvements obvious to a person skilled in the art can be made to the embodiment which is the subject of the present description without departing from the scope of the present invention defined by the appended claims.
Claims (9)
- Fly-back hand mechanism for a chronograph comprising a control device (5, 7; 105, 107; 205, 207) comprising a manual control mechanism accessible from the outside of the case of the chronograph and at least one moving part (7; 107; 207) arranged to be selectively in two predefined configurations and to pass alternately from one of the two predefined configurations to the other when the control device (5, 7; 105, 107; 205, 207) is switched with the aid of the manual control mechanism, and a split-seconds clamp (19; 119; 219) arranged to be actuated by the moving part (7; 107; 207) and the two arms of which (21a, 21b; 121a, 121b; 221a, 221b) are arranged to cooperate with a fly-back hand wheel (3; 103; 203) coaxial to a chronograph wheel, so as to make it possible alternately to release and immobilise the fly-back hand wheel (3; 103; 203) by switching the control device (5, 7; 105, 107; 205, 207) so as to cause the split-seconds clamp (19; 119; 219) to open and close alternately, the split-seconds clamp (19; 119; 219) being formed as one piece comprising two arms (21a, 21b; 121a, 121b; 221a, 221b) and an elastic transverse arm (23; 123; 223) deformable by flexing, the elastic transverse arm connecting the two arms (21a, 21b; 121a, 121b; 221a, 221b) to one another so as to permit the two arms to be moved apart and towards each other when the transverse arm is elastically deformed, and the moving part (7; 107; 207) being arranged to cooperate with the elastic transverse arm (23; 123; 223) so that, when the control device (5, 7; 105, 107; 205, 207) is switched, the passage of the moving part (7; 107; 207) from one of its two predefined configurations to the other causes a change to the curvature of the elastic transverse arm (23; 123; 223), and thus to the spacing of the arms of the split-seconds clamp (19; 119; 219); characterised in that the split-seconds clamp (19; 119; 219) comprises two pivot members (25a, 25b; 125a, 125b; 225a, 225b) each fixed at one end of the elastic transverse arm and free to rotate about two parallel axes, the distance separating the two parallel axes being such that the elastic transverse arm (23; 123; 223) is in a buckled state or, in other words, curved by deformation in a direction perpendicular to the plane containing the two parallel axes between the two pivot members (25a, 25b; 125a, 125b; 225a, 225b).
- Fly-back hand mechanism as claimed in claim 1, characterised in that the moving part (7; 107; 207) is arranged to permit a middle part of the elastic transverse arm (23; 123; 223) to be pushed away in the direction of the fly-back hand wheel (3; 103; 203).
- Fly-back hand mechanism as claimed in claim 1 or 2, characterised in that the moving part (7; 107) is arranged to permit a middle part of the elastic transverse arm (3; 103) to be pulled in the direction opposite to that of the fly-back hand wheel (3; 103).
- Fly-back hand mechanism as claimed in any one of claims 1, 2 and 3, characterised in that the moving part (7; 207) is arranged to cause the curvature of the elastic transverse arm (23; 223) to change when the control device (5, 7; 205, 207) is switched, without causing the direction of the buckling of the latter to change.
- Fly-back hand mechanism as claimed in claim 4, characterised in that the direction of the buckling is such that the concavity is open towards the fly-back hand wheel.
- Fly-back hand mechanism as claimed in claims 2 and 3, characterised in that the moving part (107) is arranged to cause an inversion of the direction of the buckling of the elastic transverse arm (123) when the control device (105, 107) is switched.
- Fly-back hand mechanism as claimed in any one of the preceding claims, characterised in that the control device (5, 7; 105, 107) comprises a column wheel (5; 105) and a control lever (7; 107) having an end formed by a beak (11; 111) arranged to be biased against the columns of the column wheel (5; 105) and another end constituting a coupling element (17a, 17b; 117a, 117b) arranged to cooperate with the elastic transverse arm (23; 123).
- Fly-back hand mechanism as claimed in claim 1, characterised in that the control device (205, 207) comprises a column wheel (205), the columns of which together act as a cam (207) arranged to cooperate with the elastic transverse arm (223) so as to push away a middle part of the latter.
- Chronograph characterised in that it comprises a fly-back hand mechanism as claimed in any one of the preceding claims.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP18177764.0A EP3582029B1 (en) | 2018-06-14 | 2018-06-14 | Fly-back hand mechanism and chronograph comprising such a mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18177764.0A EP3582029B1 (en) | 2018-06-14 | 2018-06-14 | Fly-back hand mechanism and chronograph comprising such a mechanism |
Publications (2)
Publication Number | Publication Date |
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EP3582029A1 EP3582029A1 (en) | 2019-12-18 |
EP3582029B1 true EP3582029B1 (en) | 2021-09-08 |
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EP18177764.0A Active EP3582029B1 (en) | 2018-06-14 | 2018-06-14 | Fly-back hand mechanism and chronograph comprising such a mechanism |
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Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2023248178A1 (en) * | 2022-06-23 | 2023-12-28 | Lvmh Swiss Manufactures Sa | Bistable timepiece control mechanism |
WO2023248177A1 (en) | 2022-06-23 | 2023-12-28 | Lvmh Swiss Manufactures Sa | Bistable timepiece control mechanism |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CH337151A (en) * | 1958-03-13 | 1959-03-15 | Depraz & Cie | Rattrapante needle timepiece |
CH679969B5 (en) * | 1990-12-11 | 1992-11-30 | Ebauchesfabrik Eta Ag |
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