EP3874331B1 - Oscillating weight with variable geometry for a timepiece mechanism - Google Patents

Description

Technical area

The present invention relates to a timepiece comprising an oscillating weight with variable geometry for a timepiece mechanism.

State of the art

Oscillating weights for automatic watches are well known and widely used. Typically, an oscillating mass makes it possible to ensure the winding of a movement thanks to its oscillations generated by the movements of the wearer of the watch. The mass is pivotally mounted for example by means of a bearing. As a rule, an inverter ensures the transformation of the reciprocating movement of the mass into a one-way rotary movement. The gear trains of the winding system ensure the connection between the various elements. The rotational drive of the winding train makes it possible to arm a source of energy of the watch, for example the spring of a barrel.

Watches are known in which the oscillating mass is arranged at the bottom of the case, for example mounted on the bridge side of the watch. Watches are also known in which the oscillating weight is arranged in correspondence of the dial of the watch.

We know of oscillating weights which are not visible to the wearer of the watch. However, automatic watches provided with an oscillating weight visible by the wearer on the back or front face of the watch are also known.

An ideal oscillating weight has both a large mass and a large moment of inertia, which allows efficient winding of the watch. It can concentrate most of its mass on its outer periphery. Such a mass generally comprises a massive peripheral part, generally in the form of an arc of a circle. This part will be referred to below as the “inertial sector”. In this context, a "plank" connects the sector of inertia to the bearing, which defines the axis of rotation of the mass.

In general, such a mass also comprises connecting elements, for example arms, connecting the sector of inertia to the bearing. These arms can define openings, making it possible to see at least partially the elements behind and/or in front of the oscillating mass, while reducing its mass.

Other oscillating masses have no openings.

As a general rule, the known oscillating weights consist of a single piece, having a fixed geometry, that is to say a geometry which does not vary over time. The winding torque of these masses does not vary over time either.

In other known examples, the oscillating mass comprises two or more parts whose relative position does not change substantially over time. In other words, during the movement of the oscillating mass, these parts are synchronous.

For example, the document CH707942 relates to a mass comprising two parts linked by a rigid mechanical synchronization link, for example a connecting rod, each end of which is secured to one of the parts by a screw. The two parts are always synchronous.

The document EP1136891 concerns two oscillating masses in the same plane, connected by a gear train so that the two masses still have a synchronous movement, in order to avoid collisions.

The document EP1918789 describes an oscillating mass comprising two parts, one part of which moves on a guide means on the periphery of the other part. The moving part gives the initial impulse to the oscillating mass. Then the two parts have a fixed position relative to each other.

In the case of a monobloc mass or in several parts as presented, under normal conditions of use of the watch, the movements of the arm of the wearer of the watch bring the mass into imbalance and it is the latter and the terrestrial acceleration g which define the torque.

If the wearer is a very active person, the accelerations encountered may be significantly higher. For example, the arm and/or the hand which wears the watch comprising such an oscillating mass can (can) undergo high accelerations. This happens, for example, when the user plays a sport such as tennis, golf, etc.

Currently, the winding mechanisms are chosen so that they provide conditions for winding the spring for a normally active person. As a result, for a very active wearer, the barrel spring is highly stressed and a risk of wear cannot be excluded. If, on the contrary, the wearer is not very active, it is possible that the mainspring is not sufficiently armed.

In such cases it would be desirable that the movement of the mass not cause the winding of the watch under certain conditions. However, this would imply that in the case of “normal” use of the watch, that is to say, for example when the user does not play sports, the winding of the watch would no longer be carried out.

The document EP1445668 relates to an oscillating mass comprising two parts removable with reference to each other, and arranged in such a way that their relative movement generates a radial displacement of the center of gravity of the oscillating mass. Thus, it is possible to vary the working conditions of the mechanism and to adapt it to the lifestyle of the wearer.

However, the oscillating mass described in the document EP1445668 has certain disadvantages. Indeed, to move the center of gravity of the oscillating mass, it is necessary to take the watch to a watchmaker trained for this purpose, because this movement is achieved by unscrewing screws and nuts which fix the position of the first part compared to the second. Then it is necessary to move the second part to a new position and screw in the screws and nuts again.

The change in geometry and therefore in the position of the center of mass (or the center of gravity) of the watch is therefore neither simple nor immediate. It cannot be performed by the wearer of the watch.

The user of known watches cannot directly vary the geometry of the oscillating mass, and therefore the position of its center of gravity and thus adapt it to his way of life (for example, sports mode, normal mode, ... ).

In other words, a user has no known solutions for acting himself on the watch so that the movement of the mass does not cause his watch to wind up under certain conditions (for example and in a non-limiting when he practices a sport), and also in such a way that the movement of the mass causes on the contrary the winding of the watch in other conditions (for example and in a non-limiting way when he has finished practicing his sport ).

The document EP2544055 describes an oscillating part such as an oscillating weight, in which a front surface of the oscillating part is used as an additional display surface. In one example, the oscillating mass carries a dial and three output displays, in particular three hands. The three hands are linked, via gears, to three output wheels rotating around the main pivot axis of the mechanism. The dial is carried by a dial wheel, which is linked via an intermediate gear train to a toothing which gives the angular position of the oscillating weight. In this mechanism, the dial remains permanently in the same angular orientation with respect to the plate of the movement, and to the case which contains the latter. This document does not describe a mechanism making it possible to vary the center of gravity of the oscillating mass, nor the winding torque.

The document US2593685 relates to a mechanism intended to be mounted on the steering wheel of a car and which exploits the movements of the steering wheel and/or the vibrations of the car to wind a watch. To this end, the mechanism comprises a casing linked to the flywheel and comprising two masses in the shape of a sphere or half-sphere, arranged so that the larger contains the smaller. The two masses are connected to a "differential" mechanism, comprising two parallel bevel gears, both connected to a third bevel gear mounted on a shaft. The mechanism is arranged in such a way that the movements of the masses are transformed into a unidirectional rotational movement of the shaft around the axis, independently of the direction of oscillation of the two masses. In the solution described, the masses make it possible to rotate the differential mechanism by their movement.

There is therefore a need for a timepiece comprising an oscillating weight with variable geometry free from the limitations of known oscillating weights.

There is therefore a need for a timepiece comprising an oscillating weight with variable geometry in which the geometry and therefore the position of the center of gravity of the mass can be varied by the user of the watch without having the need to bring the watch to a watchmaker trained for this purpose.

There is therefore a need for a timepiece such as an automatic watch in which the movement of the mass does not cause the watch to be wound under certain conditions, according to the wishes of the user.

Brief summary of the invention

An object of the present invention is to provide a timepiece comprising an oscillating weight with variable geometry free from the limitations of known oscillating weights.

An object of the present invention is also to provide a timepiece comprising an oscillating mass with variable geometry in which the position of the center of mass can be modified by the user of the watch without having to take the watch to a watchmaker trained in this effect.

An object of the present invention is also to provide a timepiece such as an automatic watch, the user of which can directly vary the geometry of the oscillating mass, and therefore the position of its center of gravity and thus adapt it to its lifestyle (for example, sports mode, normal mode, ...).

According to the invention, these objects are achieved in particular by means of the timepiece according to claim 1.

• une première pièce,
• une deuxième pièce,
• un premier axe de rotation commun à la première pièce et à la deuxième pièce, au moins l'une entre la première pièce et la deuxième pièce étant arrangée pour pouvoir osciller autour du premier axe de rotation,
• un mécanisme différentiel relié à la première pièce et à la deuxième pièce de façon à varier la position relative d'une pièce par rapport à l'autre par un mouvement rotatif d'au moins une des pièces autour dudit axe de rotation, ce(s) déplacement(s) variant la géométrie de la masse oscillante et la position du centre de gravité de la masse oscillante.

The oscillating weight with variable geometry for a watch mechanism of the timepiece according to the invention comprises:

• a first piece,
• a second room,
• a first axis of rotation common to the first part and to the second part, at least one between the first part and the second part being arranged to be able to oscillate around the first axis of rotation,
• a differential mechanism connected to the first part and to the second part so as to vary the relative position of one part with respect to the other by a rotary movement of at least one of the parts around the said axis of rotation, this (s) ) displacement(s) varying the geometry of the oscillating mass and the position of the center of gravity of the oscillating mass.

In this context, a "differential mechanism" is a horological mechanism which comprises at least one sun wheel and at least one satellite wheel comprising an axis of rotation, arranged both to turn around this axis of rotation and to turn around the sun wheel.

In a preferred variant, the differential mechanism is a double satellite and double sun wheel differential mechanism, that is to say it comprises two sun wheels and two planet wheels.

Thanks to the presence of the differential mechanism, this solution has the particular advantage over the prior art of being able to vary the geometry of the oscillating mass, and therefore the position of its center of gravity, directly by the user of the watch. , without having to take the watch to a watchmaker trained for this purpose.

The user can thus ensure that the movement of the mass does not cause the winding of the watch under certain conditions (for example and in a non-limiting way when he practices a sport), and ensure that the movement of the mass cause the watch to be wound under other conditions (for example and in a non-limiting way when he has finished practicing his sport).

Brief description of figures

• La figure 1A illustre une vue en perspective d'un côté de la masse oscillante de la pièce d'horlogerie selon un mode de réalisation de l'invention, dans laquelle la première pièce de la masse occupe une première position par rapport à la deuxième pièce.
• La figure 1B illustre une vue en perspective de la masse oscillante de la figure 1A, dans laquelle la première pièce de la masse occupe une deuxième position par rapport à la deuxième pièce.
• La figure 2 illustre un schéma logique du fonctionnement de la masse oscillante de la pièce d'horlogerie selon l'invention.
• La figure 3 illustre une vue en perspective de l'autre côté de la masse oscillante de la figure 1A.
• La figure 4 illustre une vue en perspective d'un mode de réalisation du mécanisme différentiel de la masse de la pièce d'horlogerie selon l'invention.
• La figure 5 illustre une vue en section de la masse oscillante de la figure 3.
• Les figures 6A à 6C illustrent des vues en perspective d'un autre mode de réalisation de la masse oscillante de la pièce d'horlogerie selon l'invention, dans lesquelles la première pièce de la masse occupe trois positions différentes par rapport à la deuxième pièce.
• La figure 7A illustre une vue de dessus d'un mode de réalisation de la masse oscillante de la pièce d'horlogerie selon l'invention, dans laquelle la première pièce de la masse occupe une première position par rapport à la deuxième pièce.
• La figure 7B illustre une vue de dessus du mode de réalisation de la masse oscillante de la figure 7A, dans laquelle la première pièce de la masse occupe une deuxième position par rapport à la deuxième pièce.
• La figure 8 illustre une vue en perspective d'une pièce d'un mode de réalisation de la masse oscillante de la pièce d'horlogerie selon l'invention.
• La figure 9 illustre une vue de dessus du mécanisme de pilotage d'un mode de réalisation de la masse oscillante de la pièce d'horlogerie selon l'invention, dans une première position de repos.
• La figure 10 illustre une vue de dessus du mécanisme de pilotage de la figure 9, dans une première position de sélection, avec la roue pilote.
• La figure 11 illustre une vue de dessus du mécanisme de pilotage de la figure 9, dans une première position de butée.
• La figure 12 illustre une vue de dessus du mécanisme de pilotage de la figure 9, dans une deuxième position de repos.
• La figure 13 illustre une vue de dessus du mécanisme de pilotage de la figure 9, dans une position d'appui pour déverrouillage.
• La figure 14 illustre une vue de dessus du mécanisme de pilotage de la figure 9, dans une deuxième position de butée, avec la roue pilote.

Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:

• The Figure 1A illustrates a perspective view of one side of the oscillating mass of the timepiece according to one embodiment of the invention, in which the first part of the mass occupies a first position relative to the second part.
• The figure 1B illustrates a perspective view of the oscillating weight of the Figure 1A , in which the first part of the mass occupies a second position with respect to the second part.
• The figure 2 illustrates a logic diagram of the operation of the oscillating mass of the timepiece according to the invention.
• The picture 3 illustrates a perspective view from the other side of the oscillating weight of the Figure 1A .
• The figure 4 illustrates a perspective view of an embodiment of the differential mechanism of the mass of the timepiece according to the invention.
• The figure 5 illustrates a cross-sectional view of the oscillating weight of the picture 3 .
• The figures 6A to 6C illustrate perspective views of another embodiment of the oscillating mass of the timepiece according to the invention, in which the first part of the mass occupies three different positions with respect to the second part.
• The Figure 7A illustrates a top view of an embodiment of the oscillating mass of the timepiece according to the invention, in which the first part of the mass occupies a first position relative to the second part.
• The figure 7B illustrates a top view of the oscillating weight embodiment of the Figure 7A , in which the first part of the mass occupies a second position with respect to the second part.
• The figure 8 illustrates a perspective view of a part of an embodiment of the oscillating weight of the timepiece according to the invention.
• The figure 9 illustrates a top view of the piloting mechanism of an embodiment of the oscillating mass of the timepiece according to the invention, in a first rest position.
• The figure 10 illustrates a top view of the steering mechanism of the figure 9 , in a first selection position, with the pilot wheel.
• The figure 11 illustrates a top view of the steering mechanism of the figure 9 , in a first stop position.
• The figure 12 illustrates a top view of the steering mechanism of the figure 9 , in a second rest position.
• The figure 13 illustrates a top view of the steering mechanism of the figure 9 , in a support position for unlocking.
• The figure 14 illustrates a top view of the steering mechanism of the figure 9 , in a second stop position, with the pilot wheel.

Example(s) of embodiment(s) of the invention

The Figure 1A illustrates a perspective view of one side of the oscillating mass 1 of the timepiece according to one embodiment of the invention, in which the first part 10 of the mass occupies a first position relative to the second part 20.

In the example of the Figure 1A , the first part 10 comprises at its periphery a sector of inertia 12 defining the large part of its mass and a board 16 connecting the sector to a bearing (not shown), for example a ball bearing, carried by the oscillating mass 1 and defining a first axis of rotation 40. In the example illustrated, the board 16 comprises arms 17, defining openings 14. In other variants, these openings 14 are not present.

In the example of the Figure 1A , the sector of inertia 12 has a periphery substantially in the shape of an arc of a circle. In addition, the first part 10 has substantially the shape of a circular sector, extending over an angle of approximately 60°. In general, this sector can extend over an angle in the range 15°-90°.

In the example of the Figure 1A , the board 16 is substantially planar, that is to say that it extends substantially on a single plane.

In the example of the Figure 1A , the second part 20, which is a different part from the first part 10, also comprises at its periphery a sector of inertia 22 defining the large part of its mass and a plate 26 connecting the sector 22 to the bearing (not shown). In this case too, the board 26 comprises arms 27 defining openings 24. In other variants, these openings 24 are not present. The presence of openings 14, 24 in one of the two parts 10, 20 does not necessarily imply the presence of openings in the other part 20 respectively 10.

In the example of the Figure 1A , the sector of inertia 22 has a periphery substantially in the shape of an arc of a circle. In addition, the first part 10 has substantially the shape of a circular sector, similar to that of part 20.

Although in the example of the Figure 1A the two parts 10, 20 have substantially the same shape and extend substantially over the same angle, this is not an essential feature of the invention. It is in fact possible to imagine parts 10, 20 having different shapes and/or which extend over different angles.

In the example of the Figure 1A , the board 26 of the second part 20 is not substantially flat, but it extends over two planes. In particular, in the example of the Figure 1A , the board 26 of the second part 20 comprises a first part 261, proximal to the axis of rotation 40 and a second part 262, distal to the axis of rotation 40, which belong to two different planes.

In particular, the distance between these two planes 261, 262 corresponds substantially to the thickness of the first part 10 so that when the sector of inertia 12 of the first part 10 comes into contact with the sector of inertia 22 of the second part 20 in correspondence of the contact region C, the board 16 of the first part 10 and the second part 262 of the board 26 of the second part 20 are coplanar.

In other words, in the example of the Figure 1A , the first part 10 is only partially superimposed on the second part 20, in correspondence of the first part 261 of the board 26 of the second part 20.

In other words again, in the example of the Figure 1A , the sector of inertia 12 of the first part 10 is arranged side-by-side of the sector of inertia 22 of the second part 20. In addition, a first part 161 of the board 16 of the first part 10 is superimposed on a first part 261 of the board 26 of the second part 20 (in correspondence of the axis of rotation 40) and a second part 162 of the board 16 of the first part 10 is arranged side by side of the second part 262 of the board 26 of second exhibit 20.

Of course, other variants can be imagined, for example and in a non-limiting way, the sector of inertia 12 of the first part 10 can be arranged side by side of the sector of inertia 22 of the second part 20 and the entire board 16 of the first part 10 can be superimposed on the entire board 26 of the second part 20.

In yet another variant, each of the two parts 10, 20 is flat and a first part 161 of the board 16 of the first part 10 is superimposed on a first part 261 of the board 26 of the second part 20 (in correspondence of the axis of rotation 40). The two pieces thus remain on two different planes even when they are placed next to each other. It is possible that in this variant one end of the sector of inertia of a part is partially superimposed on the sector of inertia of the other part

Alternatively, when the two parts 10, 20 are placed next to each other, the oscillating weight 1 may include means for maintaining the position of one part relative to the other. For example, one part may carry a finger or pin which engages a corresponding opening in the other part. Other variants can easily be imagined.

In a variant, the first part 10 and/or the second part 20 are made of heavy material, frequently heavy metal, gold or platinum in high-end watches.

According to the invention, a differential mechanism 30, partially visible on the Figure 1A , is connected to the first part 10 and to the second part 20 so as to vary the relative position of a part with respect to the other by a rotary movement of at least one of the parts around the axis of rotation 40, this rotary movement causing the geometry of the oscillating weight 1 to vary and therefore the position of the center of rotation of the oscillating weight 1 and by therefore the winding torque of the watch. This relative movement of one part with reference to the other is achieved by a rotation of at least one of the two parts 10, 20 around the axis 40 of the oscillating weight 1.

Indeed, as seen in the figure 1B , thanks to this differential mechanism 30, the first part 10 has moved relative to the Figure 1A in a new position in which it is opposed to the second part 20, which in this example has remained fixed.

In the position of the figure 1B , the displacement of the mass 1 does not produce any winding of the energy source of the watch. This is a position which completely cancels the winding movements of the oscillating weight 1. This position corresponds in this case to the configuration in which the two parts 10, 20 of the oscillating weight 1 are opposite each other to the other. In this case, the center of gravity of the mass is placed at its center.

On the other hand, in the configuration of the Figure 1A , the winding of the energy source of the watch is maximum. This position at maximum winding corresponds in this case to the configuration in which the two parts 10, 20 of the oscillating weight 1 are side by side.

The user can advantageously modify the geometry of the oscillating mass 1 of the timepiece according to the invention, that is to say the winding torque of the watch, at any time, for example between two extreme positions ( for example those of figures 1A and 1B ). In a variant, only the extreme positions can be selected by the wearer of the watch. In another variant, it is possible to also select one or more intermediate positions between these two extreme positions.

In a variant, an indicator (not shown) makes it possible to display the chosen pair.

This results in an interaction with the wearer of the watch who adapts the geometry of the two oscillating parts 10, 20 either to take account of his activity or, for example, to remain in the optimum voltage zone of the energy source of the watch. (for example power reserve in the middle zone).

Although in the variant of figures 1A and 1B it is the first part 10 which moves relative to the second 20, it is possible in addition or alternatively for the second part 20 to move relative to the first part 10.

For example, it is possible that when the first piece 10 moves, the second piece 20 also moves.

It is also possible that only the second part 20 moves relative to the first part 10, which remains fixed.

Although in the variant of figures 1A and 1B the angular displacement of the first part 10 with respect to the second part 20 takes place in the clockwise direction, counterclockwise or even bi-directional displacements can be provided.

The picture 2 illustrates a logic diagram of the operation of the oscillating mass 1 of the timepiece according to the invention. By using a means of selecting the desired winding 50 of the watch, for example a crown or a button, the user selects the desired variant. Alternatively, this means makes it possible to select an operating mode of the watch, for example from among at least two possible operating modes, each operating mode corresponding to a predetermined configuration of the two parts 10, 20 of the mass and therefore to a predefined geometry. For example, the user can choose between a "SPORT" mode, in which the position of the two parts 10, 20 of the mass does not allow winding of the watch (for example as illustrated in the figure 1B ) and a “NORMAL” mode, in which the position of the two parts 10, 20 of the mass allows maximum winding of the watch (for example as illustrated in the Figure 1A ).

Optionally, an optional indicator 60 can indicate the configuration of the parts 10, 20 chosen and/or the mode of operation of the watch chosen.

The differential mechanism 30 of the timepiece according to the invention has been represented on the figure 2 as comprising two inputs (in particular a wheel 34 of the differential mechanism 30 which will be discussed later) and one of the two parts, for example the first part 10 and an output, for example the other of the two parts 10, 20 (the second part 20 in this case).

The picture 3 illustrates a perspective view from the other side of the oscillating mass 1 of the Figure 1A . In this example, it is possible to see one embodiment of the interaction of the differential mechanism 30 with the parts 10, 20.

In the example of the picture 3 , the differential mechanism 30 comprises a first satellite wheel 33a.

In this context, the expression "satellite wheel" designates a wheel, in particular a toothed wheel, which is arranged both to rotate around its axis of rotation and which can at the same time also rotate around another wheel.

In the case of the picture 3 , the first satellite wheel 33a comprises an axis of rotation 42 around which it can rotate. It is connected to the second part 20, in particular it is carried by the second part 20. It is arranged both to turn around the second axis of rotation 42 and to turn around an intermediate wheel 32 connected to the second part 20 The intermediate wheel 32 is therefore a connecting wheel. In a preferred variant, its dimensions are smaller than those of the central wheels 31, 34 and of the two satellite wheels 33a, 33b.

The intermediate wheel 32 in the example of picture 3 is also carried by the second part 20 and has the function of planet carrier. It meshes with a first central wheel 31 which has the function of a sun wheel, around which one or more satellites can turn.

In the variant illustrated, the first sun wheel 31 is connected to the first part 10, in particular it is carried by the first part 10. It is arranged to rotate around the axis of rotation 40 of the oscillating weight 1.

In the example of the picture 3 , the differential mechanism 30 also comprises a second planet wheel 33b, which in the case illustrated is coaxial with the first planet wheel 33a. This second satellite wheel 33b is still connected to the second part 20, in particular it is carried by the second part 20. It is arranged both to turn around the axis of rotation 42 and to turn around a second central wheel. 34 which also has the function of a sun wheel, around which one or more satellites can turn.

In the variant illustrated, the second sun wheel 34 is fixed most of the time, except during the change of geometry of the oscillating mass 1. It is arranged to rotate around the axis of rotation 40 of the oscillating mass 1.

The differential mechanism of picture 3 is therefore a differential mechanism with double satellite and double sun wheel.

Although in the example of the picture 3 the first planet wheel 33a is coaxial with the second planet wheel 33b, in another variant (not shown) the two planet wheels are not coaxial and rotate around different axes.

In the example of the picture 3 , the two central wheels 31, 34 and the two parts 10, 20 of the oscillating mass 1 are all coaxial. They are arranged to rotate around the axis of rotation 40.

In the standard situation, when no modification is made by the wearer of the watch, the sun wheel 34 is kept fixed by means of a fixing mechanism (not shown) such as a jumper.

In the event of modification by the wearer of the watch, the second sun wheel 34 rotates around the axis of rotation 40, thus driving the second satellite wheel 33b around its axis of rotation 42 and around the sun wheel 34. The second planet wheel 33b in turn drives the rotation of the first planet wheel 33a around its axis of rotation 42 and around the first sun wheel 31. The first sun wheel 31 therefore also rotates around the axis of rotation 40, by causing the displacement of the first part 10 with respect to the second part 20.

It should be noted that during the relative displacement of one part 10, 20 with respect to the other 20, 10, the satellite wheels 33a, 33b rotate both around their axis of rotation 42 and also around the central wheels ( or possibly intermediate wheels). Once the two pieces are in the desired relative position, they no longer move relative to each other. In this case, during the movement of the oscillating mass 1, the two parts are synchronous and during their movement, the planet wheels 33a, 33b turn only around their axis of rotation 42.

In the variant of picture 3 , the control for modifying the geometry of the oscillating weight 1, performed by the wearer of the watch, acts via a gear train (not shown) at the level of a third central wheel (not shown) superimposed and integral with a sun wheel (for example the second sun wheel 34) in order to modify its setting. In a preferred variant, the fineness of the adjustment depends on the number of teeth of the third central wheel.

In the variant of picture 3 , a detail of which is illustrated on the figure 4 and a sectional view of the figure 5 , the first planet wheel 33a is smaller than the second planet wheel 33b and the first sun wheel 31 is larger than the second sun wheel 34.

The figures 6A to 6C illustrate perspective views of another embodiment of the oscillating mass 1 of the timepiece according to the invention, in which the first part 10 of the mass occupies three different positions with respect to the second part 20. These positions are not limiting and the first piece 10 of the mass could occupy a different number of three different positions with respect to the second piece 20.

In the three cases illustrated, the first part 10 is arranged to be completely superimposed on the second part 20 (as illustrated in the Fig. 6C ). When the two parts 10, 20 are completely superimposed, their occupation of the surface is minimal. In this case, their size and/or their weight can be adapted in order to take account of this particularity (at equal weight, this oscillating mass, although thicker, occupies a lower surface).

In another variant (not illustrated), the oscillating mass 1 comprises several parts (for example three or more) and a differential mechanism arranged to move the parts so that they are all superimposed on each other and to move them the way you open a fan.

Alternatively, an indicator (not shown) informs the wearer about the angular difference between the two parts 10, 20 chosen by the wearer of the watch and/or about the mode of operation chosen and/or about the geometry of the weight oscillating weight and/or on the winding torque of the oscillating weight.

One can for example fix by convention that this value is zero when the two coins 10, 20 are in opposition (as for example on the figure 1B ) and equal to N (N being an integer, for example N = 10) when they are brought next to each other (as for example on the Figure 1A ) or superimposed (as for example on the Fig. 6C ).

In the case where this indicator is visible only on the back of the watch, that is to say the part of the watch which is in contact with the wrist of the user, it can be achieved in the following way : one of the two parts 10, 20, in particular the one that moves, can comprise one end of the mass configured in such a way as to represent the end of an indicator such as a needle. A scale, or any other equivalent means, can be positioned on the other part.

In another variant, an indicator such as a hand is made integral with a sun wheel, for example the wheel 34. This indicator can be indexed with a scale or any other equivalent means which can for example appear at the level of the dial of the watch, taking into account the relative position of the two parts 10, 20. In this variant, a gear train connected to the wheel 34 can make it possible to display the position of the latter at various places on the dial, for example by means of a needle or an indicator disc, or even on a side of the case, for example by means of a disc visible through an aperture.

In another variant, the wheels of the differential mechanism can be dimensioned so that the parts 10, 20 move with the same angular speed. In other variants, the wheels of the differential mechanism are dimensioned so that the parts 10, 20 move with a different angular speed.

In another variant, the angular speed of a part is greater, for example twice or N times greater, than the angular speed of the corresponding sun wheel. In a variant, this ratio will be taken into account to dimension a possible correction mechanism.

The Figure 7A illustrates a top view of another embodiment of the oscillating mass 1 of the timepiece according to the invention, in which the first part 10 of the mass occupies a first position relative to the second part 20. In particular , the first part 10 is arranged next to the second part 20, similarly to the Figure 1A .

The figure 7B illustrates a top view of the oscillating weight embodiment of the Figure 7A , in which the first part 10 of the mass 1 occupies a second position with respect to the second part 20. In particular, the first part 10 is opposed to the second part 20, in a manner similar to the figure 1B . The arrows F1, F2 indicate the direction of the angular displacement of the first part 10 relative to the second part 20 (by 90° in the example shown) respectively of the differential mechanism 30.

The figure 8 illustrates a perspective view of a part of another embodiment of the oscillating weight 1 of the timepiece according to the invention. In this example, it is possible to see one embodiment of the interaction of the differential mechanism 30 with the parts 10, 20.

In the example of the figure 8 , the differential mechanism 30 comprises a first satellite wheel 33a. The illustrated first satellite wheel 33a comprises an axis of rotation 42, around which it can rotate. It is connected to the first piece 10. It is arranged both to turn around the axis of rotation 42 and to turn around an intermediate wheel 32 connected to the first part 10. The intermediate wheel 32 is therefore a connecting wheel.

The intermediate wheel 32 in the example of figure 8 has the function of satellite carrier. It meshes with a first central wheel 31 which has the function of a sun wheel, around which one or more satellites can turn.

In the variant illustrated, the first sun wheel 31 is connected to the first part 10. It is arranged to rotate around the axis of rotation 40 of the oscillating mass 1.

In the example of the figure 8 , the differential mechanism 30 also comprises a second planet wheel 33b, which in the case illustrated is coaxial with the first planet wheel 33a. This second satellite wheel 33b is connected to the second part 20. It is arranged both to turn around the axis of rotation 42 and to turn around a second intermediate wheel 35 connected to the second part 20. The intermediate wheel 35 is therefore also a connecting wheel.

The intermediate wheel 35 in the example of figure 8 has the function of satellite carrier. It meshes with a second central wheel 34 which has the function of a sun wheel, around which one or more satellites can turn.

In the variant illustrated, the first intermediate wheel 32 is coaxial with the second intermediate wheel 35. In particular, these wheels share the axis of rotation 43.

In the variant of figure 8 , the oscillating mass 1 also comprises a frame 80 which comprises a central part 81, substantially rectilinear and two ends 82, 83, of substantially circular shape. Each of these ends carries an axis, in particular the end 82 carries the axis of rotation 42 of the first and second planet gears 33a, 33b and the end 83 carries the axis of rotation 43 of the first and second intermediate wheels 32, 35 In a preferred variant, the frame 80 is arranged to rotate around the axis of the axis of rotation 43 of the first and second intermediate wheels 32, 35.

In the variant illustrated, the frame 80, in particular its central part 81, comprises an opening 84, to reduce its weight.

The end 83 of the frame 80, which carries the axis of rotation 43 of the first and second intermediate wheels 32, 35 comprises a toothing 89 to be able to mesh with a pilot wheel 90.

In the variant of figure 8 , the pilot wheel 90 includes an opening 94 to lighten its weight.

The oscillating mass 1 of the Figures 7A, 7B and 8 is based on the differential principle. Indeed, when the chassis 80 is rotated over a given angle, the information provided to the chassis is relayed by the gear train (satellite wheels 33a, 33b, intermediate wheels 32, 35), thus allowing an angular phase shift of the two pieces 10, 20.

Indeed, in the variant of figure 8 , under the angular action of the pilot wheel 90, the frame 80 drives the two satellite wheels 33a, 33b linked together, thus generating a rotation of at least one intermediate wheel and therefore of the corresponding sun wheel, which means that the corresponding part (part 10 in the example) will shift angularly by the desired angle.

In the variant of figure 8 , the first planet wheel 33a is smaller than the second planet wheel 33b; the first intermediate wheel 32 is larger than the second intermediate wheel 35. Finally, the first sun wheel 31 is smaller than the second sun wheel 34.

In the variant of figure 8 , the first satellite wheel 33a, the first intermediate wheel 32 and the first sun wheel 31 belong to the same first plane; the second satellite wheel 33b, the second intermediate wheel 35 and the second sun wheel 34 belong to the same second plane, which on the figure 8 is lower than the foreground.

In the variant of figure 8 , the movement of the pilot wheel 90 causes the movement of the end 83 of the frame 80, in particular its rotation around the axis 43. This rotation, in one embodiment, causes the rotation of the second satellite wheel 33b around its axis 42. As the second satellite wheel 33b meshes with the second intermediate wheel 35, the latter in turn rotates around the axis of rotation 43. Since the second intermediate wheel 35 meshes with the second sun wheel 34, the latter rotates in turn around the axis of rotation 42, thus causing the second piece 20 to rotate around the same axis of rotation 42.

In another variant, alternative or complementary to the previous one, the movement of the pilot wheel 90 causes the movement of the end 83 of the frame 80, in particular its rotation around the axis 43. This rotation, in one embodiment, drives the rotation of the first planet wheel 33a around its axis 42. As the first planet wheel 33a meshes with the first intermediate wheel 32, the latter in turn rotates around the axis of rotation 43, the second intermediate wheel 35 remaining fixed. Since the first intermediate wheel 32 meshes with the first sun wheel 31, the latter in turn rotates around the axis of rotation 42, thus causing the first part 10 to rotate around the same axis of rotation 42.

The figure 9 illustrates a top view of the pilot mechanism 100 of an embodiment of the oscillating weight of the timepiece according to the invention, in a first rest position. In the example illustrated, a shuttle principle has been used, thus making it possible to select two positioning states of one part 10, 20 relative to the other 20, 10, with a two-way angular displacement.

In the variant of figure 9 , the steering mechanism 100 comprises a cam 101 coaxial with the pilot wheel 90 (not visible), a beak 103 cooperating with the cam 101 and connected to a control device 104, as well as a lock 102 also cooperating with the cam 101 .

In the variant illustrated in figure 10 , the cam 101 has a slope 1013. When the beak 103 approaches the cam 101, it will have to follow the slope 1013 of the cam 101 in order to push it and suddenly change the relative position of the parts 10, 20.

As seen on the figure 10 , when performing a full thrust on the control device 104, the lock 102 will fall into a notch of the cam 101 in order to immobilize it in a first rest position.

As seen on the figure 11 and 12 , the lock has already fallen into the notch 1012 (better visible on the figure 10 ) and held in place by its elastic means 105 (a spring in the example shown) as well as by the return of the pilot wheel 90 which is in turn pulled by the elastic means 106 (a coil spring in the example shown) .

The figure 13 illustrates a top view of the steering mechanism of the figure 9 , in a support position of the beak 103 on the cam 101 for unlocking. In particular, the beak 103 slides on the cam 101, in particular on its substantially rectilinear zone, until the lock 102 is disengaged from the cam 101. Then, under the effect of the helical spring 106, the pilot wheel 90 as well as the cam 101 are repositioned in the initial position.

The figure 14 illustrates a top view of the steering mechanism of the figure 9 , in a second stop position and with the pilot wheel 90.

In a variant, the oscillating weight 1 of the timepiece according to the invention comprises a device making it possible to check whether the acceleration of the oscillating weight 1 within the framework of a configuration like that of the Figure 1A , and in any case within the framework of a configuration different from the configuration with zero winding torque, exceeds a threshold and/or a device making it possible to measure the acceleration of such an oscillating weight 1. This device can be completely mechanical, electromechanical and/or electronic, for example an accelerometer.

In the case where this device is completely mechanical, it could comprise an element connected to one of the two parts 10, 20 so that during an acceleration of the oscillating weight 1 below a certain threshold, it does not change its position, and during an acceleration of the oscillating mass 1 equal to or greater than a certain threshold, it changes position, this change of position allowing (directly or through another element) the displacement of a part 10, 20 by relative to the other so that the movement of the mass does not wind up the energy source of the watch. In this embodiment, it is thus possible to vary the geometry of the oscillating mass automatically, without the intervention of the user, thus avoiding damage to the watch if the user has not changed the operating mode of the watch before the watch undergoes a significant acceleration.

Reference numbers used in the figures

1

Oscillating mass

10

First piece

12

Sector of inertia of the first part

14

Opening of the first piece

16

Board of the first room

17

Arm of the first piece

20

second piece

22

Sector of inertia of the second part

24

Opening of the second room

26

Board of the second piece

27

Arm of the second piece

30

Differential mechanism

31

First sun wheel

32

First intermediate wheel

33a

First satellite wheel

33b

Second satellite wheel

34

Second sun wheel

35

Second intermediate wheel

40

First axis of rotation

42

Second axis of rotation

43

Axis of rotation of the first and second intermediate wheels

50

means of selection

60

Means of indication

70

Barrel

80

Frame

81

Central part of the chassis

82

Frame end

83

Frame end

84

Chassis opening

89

Chassis toothing

90

pilot wheel

92

Steering mechanism wheel

94

Pilot wheel opening

100

Steering mechanism

101

Cam

102

Lock

103

Beak

104

Control device

105

Medium elastic (spring)

106

medium elastic

161

First part of the board of the first room

162

Second part of the board of the first room

261

First part of the board of the second room

262

Second part of the board of the second room

1011

Straight zone of the cam

1012

Cam notch

1013

Cam slope

VS

Contact region between the first part and the second part

F1

Arrow

F2

Arrow

Claims (13)

1. A timepiece comprising:

   - an oscillating weight (1) with variable geometry for a timepiece mechanism for a watch worn by a user, comprising:

   - a first part (10),

   - a second part (20),

   - a first axis of rotation (40) common to the first part (10) and to the second part (20), at least one of the first part (10) and the second part (20) being arranged to be able to oscillate about said first axis of rotation (40),

   - a selection means (50) for selecting the desired geometry of the oscillating weight (1), wherein the oscillating weight comprises

   - a differential mechanism (30) linked to the selection means (50), the first part and to the second part and configured to vary, based on the selection of the desired geometry of the oscillating weight (1), the relative position of one part with respect to the other by a rotary movement of at least one of the parts about said axis of rotation, this displacement or these displacements varying the geometry of the oscillating weight and the position of the center of gravity of the oscillating weight.
2. The timepiece as claimed in claim 1, wherein the differential mechanism (30) comprises:

   - a first sun gear (31), coaxial with the first part (10) and the second part (20) and linked to the first part (10);

   - a first planetary wheel (33a), comprising a second axis of rotation, said first planetary wheel arranged both to revolve about the second axis of rotation and to revolve about said first sun gear.
3. The timepiece as claimed in claim 2, wherein the differential mechanism (30) comprises:

   - a second sun gear (34), linked to the second part (20) and coaxial with the first part (10), the second part (20) and the first sun gear (31), and

   - a second planetary wheel (33b), comprising a third axis of rotation, said second planetary wheel (33b) being arranged both to revolve about the third axis of rotation and to revolve about said second sun gear (34).
4. The timepiece as claimed in claim 3, said second axis of rotation (42) being said third axis of rotation.
5. The timepiece as claimed in one of claims 1 to 4, said differential mechanism (30) being a differential mechanism with dual planetary wheel (33a, 33b) and dual sun gear (31, 34).
6. The timepiece as claimed in one of claims 2 to 5, said differential mechanism (30) comprising a first intermediate wheel (32), between the first planetary wheel (33a) and the first sun gear (31).
7. The timepiece as claimed in one of claims 3 to 6, said differential mechanism (30) comprising a second intermediate wheel (35), between the second planetary wheel (33b) and the second sun gear (34).
8. The timepiece as claimed in claims 6 and 7, said first intermediate wheel (32) being coaxial with the second intermediate wheel (35).
9. The timepiece as claimed in one of claims 6 to 8 when depending on claim 2, comprising a frame (80) comprising the second axis of rotation (42) and the axis of rotation (43) of the first and/or second intermediate wheel or wheels (32, 35).
10. The timepiece as claimed in claim 9, comprising a control wheel (90) arranged to mesh with said frame (80).
11. The timepiece as claimed in claim 10, comprising a control mechanism (100) of the control wheel (90), the control mechanism (100) comprising a control device (104), a cam (101) coaxial to the control wheel (90), a beak (103) cooperating with said cam (101) and linked to said control device (104) and a bolt (102) cooperating also with the cam (101).
12. The timepiece as claimed in claim 11, the control mechanism (100) comprising an elastic means (105) for holding the bolt (102) in a notch (1012) of the cam (101) and/or an elastic means (106) for holding the control wheel (90).
13. The timepiece as claimed in one of claims 1 to 12, comprising an indicator (60) arranged to indicate an angular difference between the two parts (10, 20) chosen by a wearer of the watch and/or to indicate the mode of operation of the timepiece chosen by the wearer of the watch and/or to indicate the geometry of the oscillating weight chosen by the wearer of the watch and/or to indicate the winding torque of the oscillating weight chosen by the wearer of the watch.

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