EP3475765B1 - Clock escapement - Google Patents

Clock escapement Download PDF

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Publication number
EP3475765B1
EP3475765B1 EP17733910.8A EP17733910A EP3475765B1 EP 3475765 B1 EP3475765 B1 EP 3475765B1 EP 17733910 A EP17733910 A EP 17733910A EP 3475765 B1 EP3475765 B1 EP 3475765B1
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EP
European Patent Office
Prior art keywords
winding
lever
leaf spring
escapement
elastic member
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EP17733910.8A
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German (de)
French (fr)
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EP3475765A1 (en
Inventor
Stéphane OES
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/045—Oscillators acting by spring tension with oscillating blade springs
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00—Escapements
    • G04B15/10—Escapements with constant impulses for the regulating mechanism
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00—Escapements
    • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel

Definitions

  • the present invention relates to a horological escapement, that is to say a mechanism used to maintain and count the oscillations of a horological regulator.
  • the present invention relates more particularly to an escapement comprising a bistable elastic member receiving energy from a driving member, for example a barrel, and communicating it to the regulator.
  • a driving member for example a barrel
  • An exhaust of this type is described in patent applications WO 99/64936 , WO 2009/118310 and CH 705674 .
  • the bistable elastic member is a leaf spring working in buckling.
  • the leaf spring is fixed by its two ends to recesses or to pivot members, and its midpoint is kept aligned with said two ends. The distance separating the two recesses is such that the leaf spring is subjected to compression which forces it to deform according to a second mode buckling.
  • the leaf spring thus has two convexities in opposite directions on either side of its midpoint.
  • the leaf spring can occupy two stable states, the passage from one of these stable states to the other being effected by reversing the direction of the two convexities.
  • a winding latch acting symmetrically in the area of the two convexities deforms the leaf spring from a first of its stable states to a metastable state close to an unstable state corresponding to a buckling of the fourth mode, in order to arm the leaf spring.
  • a detent lever located in the mid-point zone acts on the leaf spring to make it go beyond its unstable state and thus make it switch to its second stable state by releasing its energy.
  • the winding lever is actuated alternately by two escape wheels secured to escape gears which mesh with the last mobile of the finishing gear train of the timepiece.
  • the trigger lever cooperates with a sprung balance regulator and for this purpose comprises a fork of the same type as the conventional anchor forks.
  • the escape wheels comprise winding cams at their periphery for actuating the winding lever. These winding cams end with locking stops.
  • the winding phase of the leaf spring by the winding lever ends when the latter is blocked by one of the locking stops of the escape wheel with which it cooperates, which keeps the leaf spring in its position. metastable condition and immobilizes the two escape wheels, the finishing gear train and the winding lever.
  • the deformation of the leaf spring from its metastable state to its second stable state under the action of the chainring pin and then of its relaxation causes a rotation of the winding lever which unlocks the escape wheels and brings the lever to winding in contact with the other escape wheel to start a cycle symmetrical to the previous one, after the impulse given to the plate pin.
  • the present invention aims to remedy these drawbacks, or at least to mitigate them, and to this end proposes a horological escapement comprising a bistable elastic member, a winding lever arranged to arm the bistable elastic member during phases of 'winding, and a trigger lever arranged to be driven by a trigger of the bistable elastic member after each winding phase in order to communicate a pulse to a regulator, characterized in that it comprises a single exhaust mobile for drive the winding latch during the winding phases, the escape mobile comprising a winding member arranged to cooperate with the winding elements of the winding lever, in the manner of a gear, to make rotate the winding lever alternately in opposite directions.
  • the winding elements are defined by an inner wall of a portion of the winding lever which surrounds the winding member.
  • said inner wall follows over substantially 360 ° the trajectory of the apex of a tooth of the winding member in a reference linked to the winding lever during rotation of the winding member, in order to abut against the winding member in the event of an impact and thus secure the position of the winding lever.
  • the winding elements are for example lugs.
  • the winding member is for example a star.
  • the detent lever is arranged to cooperate with the bistable elastic member in the area of a midpoint of the bistable elastic member and the winding lever is arranged to cooperate with the bistable elastic member on both sides. other of said area.
  • an escapement for a clockwork movement comprises an escapement mobile 1, a bistable leaf spring 2, a winding lever 3 and an expansion lever 4.
  • the escape wheel 1 rotates around an axis A, in the direction indicated by the arrow F1, under the action of the movement motor member, typically formed by one or more barrels.
  • the escapement mobile 1 comprises an escape pinion 5 which meshes with the movement finishing gear, a winding member 6 which, in the example shown, is in the form of a star, and a control wheel. locking 7 having inclined teeth 8 at its periphery.
  • the escape pinion 5, the winding star 6 and the locking wheel 7 are coaxial and integral.
  • the winding star 6 and the locking wheel 7 can be in one piece.
  • the winding lever 3 and the detent lever 4 pivot around the same imaginary axis B which corresponds to the midpoint of the leaf spring 2, but are free to pivot with respect to one another.
  • the imaginary axis B is for example the axis of a rod (physical axis) driven into the winding lever 3, pivoting in bearings of the frame of the movement and around which the trigger lever 4 pivots.
  • the latches 3, 4 could be mounted on respective axes offset from one another, like the winding and detent levers described in the patent application. WO 99/64936 .
  • the rockers 3, 4 could not be mounted on physical axes but be guided around the same imaginary axis or two respective imaginary axes by flexible guidance systems.
  • the leaf spring 2 is integral with the detent lever 4 and consists of two elastic leaves 2a, 2b each having one end joined to the detent lever 4 and another end joined to the frame of the movement. Said other end of each elastic blade 2a, 2b can be joined to the frame of the movement by means of an outer frame (not shown) surrounding the leaf spring 2 and fixed to said frame, which outer frame can be integral with the spring -blade 2, as described in the patent applications WO 2009/118310 and CH 705674 .
  • the leaf spring 2 can also be a piece attached to the detent lever 4 and to the outer frame.
  • the leaf spring 2 has two convexities of opposite directions on either side of its midpoint and can pass from a first stable state to a second stable state by reversing the direction of each of the two convexities.
  • the leaf spring 2 is either pre-stressed so as to work in buckling or preformed to, in the rest state, already have two convexities as described in the international patent application. WO 2017/032528 of the present plaintiff.
  • the outer frame is deformable to allow buckling of the leaf spring 2.
  • the outer frame is rigid.
  • the winding lever 3 comprises two arms carrying at their ends two pins 3a, 3b engaged in eyelets (not shown) of the two elastic blades 2a, 2b respectively.
  • a reverse configuration is of course possible where the pins 3a, 3b would be carried by the elastic blades 2a, 2b, respectively, to engage in the eyelets of the winding lever 3.
  • other connection modes between the winding lever 3 and the elastic blades 2a, 2b are possible, for example two pins at each end of the winding lever 3 clamping the corresponding elastic blade 2a, 2b.
  • the winding lever 3 further comprises a part 9 in the form of a ring which surrounds the winding star 6.
  • the inner wall 10 of this part 9 has winding elements 11, 12 (cf. figure 2 ) formed by lugs, and is furthermore shaped irregularly to fulfill a safety function against shocks, that is to say to prevent rotation of the winding lever 3 beyond a certain play during a rotary or linear shock received by the clockwork movement.
  • the inner wall 10 of part 9 follows over substantially 360 ° the trajectory of the apex of any one of the teeth of the winding star 6 in a reference linked to the winding lever 3 during the rotation of the winding star 6 and of the oscillations of the winding lever 3 which result therefrom, in order to abut against the winding star 6 in the event of an impact.
  • the positioning of the winding lever 3 is guaranteed according to a small, predefined play, and thus prevents the winding lever 3 from triggering the tilting of the leaf spring 2 in an untimely manner.
  • the detent lever 4 comprises an inlet arm 13 terminated by an inlet spout 14 and an outlet arm 15 terminated by an outlet spout 16. These inlet and outlet spouts 14, 16 are arranged to cooperate with the teeth 8 of the locking wheel 7, as will be explained below.
  • the trigger lever 4 also includes a rod 17 ending in a fork 18 similar to that of a traditional anchor, comprising a first horn 19 and a second horn 20.
  • the fork 18 is arranged to cooperate with a plate pin 21 carried by a large plate 22 coaxial and integral with the movement regulator.
  • the regulator (not shown) oscillates around an axis C, is for example of the sprung balance type but can also be an oscillator without a physical axis, with flexible blades.
  • the escapement according to the invention operates according to cycles each corresponding to an oscillation (two vibrations) of the regulator.
  • Each cycle consists of two half cycles.
  • Each half-cycle corresponds to an alternation of the regulator and includes the following phases: arming, locking, relaxation.
  • the winding phase of the first half-cycle begins when a tooth 6a of the winding star 6 meets a first, 11, of the winding elements 11, 12 of the winding lever 3 (cf. figure 1 ). By continuing to move, tooth 6a pushes this first winding element 11, which causes the winding lever 3 to pivot about its axis B in the direction indicated by arrow F2.
  • This movement of the winding lever 3 arms the leaf spring 2 by making it pass from a first stable state to a metastable state close to an unstable state. This deformation of the leaf spring 2 is imperceptible in the region of the midpoint, so that the detent lever 4 remains stationary.
  • the principle of the state of the art has the defect that under the action of the winding of the leaf spring, the trigger lever can move slightly and lose contact with the limitation stop.
  • the trigger lever can thus vibrate during shocks or because of the natural frequency of the assembly comprising the trigger lever and the leaf spring.
  • Such a vibration can be harmful because in certain cases the dart associated with the trigger lever can rub against the small plate and slow down the regulator.
  • the present invention by the pull exerted on the trigger lever 4 by the locking wheel 7, solves or at least mitigates this problem.
  • the locking zone being relatively close to the axis of rotation B of the detent lever 4, the locking torque is potentially lower than in the state of the art.
  • the leaf spring 2 then releases the energy accumulated during winding by switching to its second stable state, the reverse of the first stable state.
  • This sudden deformation of the leaf spring 2 causes the detent lever 4 to pivot in the direction F2.
  • the inlet nose 14 of the detent lever 4 leaves the tooth 8a of the locking wheel 7, defeating the force support exerted on said inlet nozzle 14 under the action of the movement motor member, and unlocks the exhaust mobile 1, then the internal face of the second horn 20 communicates an impulse to the plate pin 21 and therefore to the regulator (cf. figure 4 ).
  • the relaxation phase ends when the relaxation lever 4 comes into abutment against the second limit stop 26 (cf. figure 5 ) in the second steady state of leaf spring 2.
  • the locking / unlocking of the exhaust mobile 1 in the present invention is effected directly by the detent lever 4 by means of the inlet and outlet nozzles 14, 16, therefore so static, rather than by the winding lever controlled by the leaf spring itself controlled by the trigger lever as in the state of the art.
  • the leaf spring 2 is only used for the impulse to the regulator. This allows the escape mobile 1 to be unlocked early enough, i.e. before the governor reaches its equilibrium position, to leave leaf spring 2 free to provide its impetus at the appropriate time, when the governor is close to its equilibrium position . The instant of the start of the pulse can therefore be precise, which favors isochronism of the regulator.
  • the use of a single exhaust mobile 1 comprising the winding elements 11, 12 eliminates the need to index two exhaust mobile relative to each other, therefore facilitates assembly, and reduces bulk and inertia.
  • the cooperation between the teeth of the winding star 6 and the winding elements 11, 12 generates little or no friction, unlike the mechanism winding cams according to documents.
  • WO 99/64936 , WO 2009/118310 and CH 705674 which slide on pins carried by the winding lever.
  • the cooperation between the winding star 6 and the winding elements 11, 12 is similar to that of a gear, the winding star 6 exerting a tangential force on the inner wall 10.
  • the winding star 6 and the locking wheel 7 could form a single piece on one level.
  • the teeth of the star 6 would ensure in certain positions the winding and in other positions the locking.
  • the bistable elastic member constituted by the leaf spring 2 could be formed from a single elastic leaf 2a or 2b and the winding lever 3 could comprise a single arm cooperating at its end with the elastic leaf.
  • the bistable elastic member could comprise several leaf springs each comprising one or more elastic leaves.
  • the exhaust mobile 1 could be located on the other side of the regulator or even be coaxial with said regulator (that is to say with the axis C).

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Description

La présente invention concerne un échappement d'horlogerie, c'est-à-dire un mécanisme servant à entretenir et compter les oscillations d'un régulateur horloger.The present invention relates to a horological escapement, that is to say a mechanism used to maintain and count the oscillations of a horological regulator.

La présente invention concerne plus particulièrement un échappement comprenant un organe élastique bistable recevant de l'énergie d'un organe moteur, par exemple un barillet, et la communiquant au régulateur. Un échappement de ce type est décrit dans les demandes de brevet WO 99/64936 , WO 2009/118310 et CH 705674 . L'organe élastique bistable est un ressort-lame travaillant en flambage. Le ressort-lame est fixé par ses deux extrémités à des encastrements ou à des organes de pivotement, et son point milieu est maintenu aligné avec lesdites deux extrémités. La distance séparant les deux encastrements est telle que le ressort-lame subit une compression qui le contraint à se déformer selon un flambage de second mode. Le ressort-lame présente ainsi deux convexités de sens opposés de part et d'autre de son point milieu. Le ressort-lame peut occuper deux états stables, le passage de l'un à l'autre de ces états stables s'effectuant en inversant le sens des deux convexités.The present invention relates more particularly to an escapement comprising a bistable elastic member receiving energy from a driving member, for example a barrel, and communicating it to the regulator. An exhaust of this type is described in patent applications WO 99/64936 , WO 2009/118310 and CH 705674 . The bistable elastic member is a leaf spring working in buckling. The leaf spring is fixed by its two ends to recesses or to pivot members, and its midpoint is kept aligned with said two ends. The distance separating the two recesses is such that the leaf spring is subjected to compression which forces it to deform according to a second mode buckling. The leaf spring thus has two convexities in opposite directions on either side of its midpoint. The leaf spring can occupy two stable states, the passage from one of these stable states to the other being effected by reversing the direction of the two convexities.

En fonctionnement, une bascule d'armage agissant symétriquement dans la zone des deux convexités déforme le ressort-lame depuis un premier de ses états stables jusqu'à un état métastable proche d'un état instable correspondant à un flambage de quatrième mode, pour armer le ressort-lame. Puis une bascule de détente située dans la zone du point milieu agit sur le ressort-lame pour lui faire dépasser son état instable et le faire ainsi basculer dans son deuxième état stable en libérant son énergie. La bascule d'armage est actionnée alternativement par deux roues d'échappement solidaires de pignons d'échappement qui engrènent avec le dernier mobile du rouage de finissage de la pièce d'horlogerie. La bascule de détente coopère avec un régulateur balancier-spiral et comprend à cet effet une fourchette du même type que les fourchettes d'ancres classiques. L'énergie permettant à la bascule de détente de déformer le ressort-lame au-delà de son état instable depuis son état métastable est fournie par le régulateur, lorsqu'une cheville de plateau solidaire du balancier percute une corne de la fourchette. Cette phase, qui nécessite un petit apport d'énergie, peut être comparée à la phase de dégagement d'un échappement à ancre. La détente du ressort-lame, c'est-à-dire son passage de son état instable à son deuxième état stable, change brusquement l'inclinaison de la zone du point milieu, ce qui fait pivoter la bascule de détente, laquelle communique alors une impulsion à la cheville de plateau. Cette phase, qui restitue une énergie nettement plus grande, peut être comparée à la phase d'impulsion d'un échappement à ancre. La différence réside dans le fait que ces deux phases correspondent à des échanges énergétiques parfaitement stables, ce qui ne saurait être le cas avec un échappement à ancre.In operation, a winding latch acting symmetrically in the area of the two convexities deforms the leaf spring from a first of its stable states to a metastable state close to an unstable state corresponding to a buckling of the fourth mode, in order to arm the leaf spring. Then a detent lever located in the mid-point zone acts on the leaf spring to make it go beyond its unstable state and thus make it switch to its second stable state by releasing its energy. The winding lever is actuated alternately by two escape wheels secured to escape gears which mesh with the last mobile of the finishing gear train of the timepiece. The trigger lever cooperates with a sprung balance regulator and for this purpose comprises a fork of the same type as the conventional anchor forks. Energy allowing the detent lever to deform the leaf spring beyond its unstable state from its metastable state is provided by the governor, when a chainring pin integral with the balance strikes a horn of the fork. This phase, which requires a small input of energy, can be compared to the release phase of an anchor escapement. The relaxation of the leaf spring, that is to say its passage from its unstable state to its second stable state, abruptly changes the inclination of the midpoint zone, which causes the trigger lever to pivot, which then communicates an impulse to the plateau peg. This phase, which releases a much greater energy, can be compared to the pulse phase of an anchor escapement. The difference lies in the fact that these two phases correspond to perfectly stable energy exchanges, which cannot be the case with an anchor escapement.

A la place de dents, les roues d'échappement comprennent à leur périphérie des cames d'armage pour l'actionnement de la bascule d'armage. Ces cames d'armage se terminent par des butées de verrouillage. La phase d'armage du ressort-lame par la bascule d'armage se termine lorsque cette dernière est bloquée par l'une des butées de verrouillage de la roue d'échappement avec laquelle elle coopère, ce qui maintient le ressort-lame dans son état métastable et immobilise les deux roues d'échappement, le rouage de finissage et la bascule d'armage. La déformation du ressort-lame de son état métastable à son deuxième état stable sous l'action de la cheville de plateau puis de sa détente cause une rotation de la bascule d'armage qui déverrouille les roues d'échappement et amène la bascule d'armage au contact de l'autre roue d'échappement pour commencer un cycle symétrique du précédent, après l'impulsion donnée à la cheville de plateau.Instead of teeth, the escape wheels comprise winding cams at their periphery for actuating the winding lever. These winding cams end with locking stops. The winding phase of the leaf spring by the winding lever ends when the latter is blocked by one of the locking stops of the escape wheel with which it cooperates, which keeps the leaf spring in its position. metastable condition and immobilizes the two escape wheels, the finishing gear train and the winding lever. The deformation of the leaf spring from its metastable state to its second stable state under the action of the chainring pin and then of its relaxation causes a rotation of the winding lever which unlocks the escape wheels and brings the lever to winding in contact with the other escape wheel to start a cycle symmetrical to the previous one, after the impulse given to the plate pin.

Un tel échappement présente plusieurs inconvénients. Les deux roues d'échappement nécessitent d'être précisément positionnées angulairement l'une par rapport à l'autre ce qui rend le montage de l'échappement relativement compliqué. De plus, ces deux roues augmentent l'inertie et affectent donc le rendement de l'échappement. Le rendement de l'échappement est aussi affecté par les cames d'armage des roues d'échappement qui produisent beaucoup de frottements.Such an exhaust has several drawbacks. The two escape wheels need to be precisely positioned angularly with respect to one another, which makes mounting the exhaust relatively complicated. In addition, these two wheels increase the inertia and therefore affect the exhaust performance. The performance of the exhaust is also affected by the winding cams of the exhaust wheels which produce a lot of friction.

La présente invention vise à remédier à ces inconvénients, ou au moins à les atténuer, et propose à cette fin un échappement d'horlogerie comprenant un organe élastique bistable, une bascule d'armage agencée pour armer l'organe élastique bistable pendant des phases d'armage, et une bascule de détente agencée pour être entraînée par une détente de l'organe élastique bistable après chaque phase d'armage afin de communiquer une impulsion à un régulateur, caractérisé en ce qu'il comprend un unique mobile d'échappement pour entraîner la bascule d'armage pendant les phases d'armage, le mobile d'échappement comprenant un organe d'armage agencé pour coopérer avec des éléments d'armage de la bascule d'armage, à la manière d'un engrenage, pour faire pivoter la bascule d'armage alternativement dans des sens opposés.The present invention aims to remedy these drawbacks, or at least to mitigate them, and to this end proposes a horological escapement comprising a bistable elastic member, a winding lever arranged to arm the bistable elastic member during phases of 'winding, and a trigger lever arranged to be driven by a trigger of the bistable elastic member after each winding phase in order to communicate a pulse to a regulator, characterized in that it comprises a single exhaust mobile for drive the winding latch during the winding phases, the escape mobile comprising a winding member arranged to cooperate with the winding elements of the winding lever, in the manner of a gear, to make rotate the winding lever alternately in opposite directions.

De préférence, les éléments d'armage sont définis par une paroi intérieure d'une partie de la bascule d'armage qui entoure l'organe d'armage.Preferably, the winding elements are defined by an inner wall of a portion of the winding lever which surrounds the winding member.

Avantageusement, ladite paroi intérieure suit sur sensiblement 360° la trajectoire du sommet d'une dent de l'organe d'armage dans un repère lié à la bascule d'armage lors de la rotation de l'organe d'armage, afin de buter contre l'organe d'armage en cas de choc et sécuriser ainsi la position de la bascule d'armage.Advantageously, said inner wall follows over substantially 360 ° the trajectory of the apex of a tooth of the winding member in a reference linked to the winding lever during rotation of the winding member, in order to abut against the winding member in the event of an impact and thus secure the position of the winding lever.

Les éléments d'armage sont par exemple des ergots.The winding elements are for example lugs.

L'organe d'armage est par exemple une étoile.The winding member is for example a star.

De préférence, la bascule de détente est agencée pour coopérer avec l'organe élastique bistable dans la zone d'un point milieu de l'organe élastique bistable et la bascule d'armage est agencée pour coopérer avec l'organe élastique bistable de part et d'autre de ladite zone.Preferably, the detent lever is arranged to cooperate with the bistable elastic member in the area of a midpoint of the bistable elastic member and the winding lever is arranged to cooperate with the bistable elastic member on both sides. other of said area.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée suivante faite en référence aux dessins annexés dans lesquels :

  • les figures 1 à 5 montrent des configurations successives d'un échappement selon l'invention pendant un premier demi-cycle de fonctionnement ; et
  • les figures 6 à 8 montrent des configurations successives de l'échappement selon l'invention pendant un deuxième demi-cycle de fonctionnement.
Other characteristics and advantages of the present invention will become apparent on reading the following detailed description given with reference to the appended drawings in which:
  • the figures 1 to 5 show successive configurations of an escapement according to the invention during a first half-cycle of operation; and
  • the figures 6 to 8 show successive configurations of the exhaust according to the invention during a second operating half-cycle.

En référence à la figure 1, un échappement pour mouvement d'horlogerie selon l'invention comprend un mobile d'échappement 1, un ressort-lame bistable 2, une bascule d'armage 3 et une bascule de détente 4.With reference to the figure 1 , an escapement for a clockwork movement according to the invention comprises an escapement mobile 1, a bistable leaf spring 2, a winding lever 3 and an expansion lever 4.

Le mobile d'échappement 1 tourne autour d'un axe A, dans le sens indiqué par la flèche F1, sous l'action de l'organe moteur du mouvement, formé typiquement par un ou plusieurs barillets. Le mobile d'échappement 1 comprend un pignon d'échappement 5 qui engrène avec le rouage de finissage du mouvement, un organe d'armage 6 qui, dans l'exemple représenté, est sous la forme d'une étoile, et une roue de verrouillage 7 présentant à sa périphérie des dents inclinées 8. Le pignon d'échappement 5, l'étoile d'armage 6 et la roue de verrouillage 7 sont coaxiales et solidaires. L'étoile d'armage 6 et la roue de verrouillage 7 peuvent être en une seule pièce.The escape wheel 1 rotates around an axis A, in the direction indicated by the arrow F1, under the action of the movement motor member, typically formed by one or more barrels. The escapement mobile 1 comprises an escape pinion 5 which meshes with the movement finishing gear, a winding member 6 which, in the example shown, is in the form of a star, and a control wheel. locking 7 having inclined teeth 8 at its periphery. The escape pinion 5, the winding star 6 and the locking wheel 7 are coaxial and integral. The winding star 6 and the locking wheel 7 can be in one piece.

La bascule d'armage 3 et la bascule de détente 4 pivotent autour d'un même axe imaginaire B qui correspond au point milieu du ressort-lame 2, mais sont libres de pivoter l'une par rapport à l'autre. En pratique, l'axe imaginaire B est par exemple l'axe d'une tige (axe physique) chassée dans la bascule d'armage 3, pivotant dans des paliers du bâti du mouvement et autour de laquelle pivote la bascule de détente 4. En variante, toutefois, les bascules 3, 4 pourraient être montées sur des axes respectifs décalés l'un par rapport à l'autre, à l'instar des bascules d'armage et de détente décrites dans la demande de brevet WO 99/64936 . Dans d'autres variantes, les bascules 3, 4 pourraient ne pas être montées sur des axes physiques mais être guidées autour d'un même axe imaginaire ou de deux axes imaginaires respectifs par des systèmes de guidage flexible.The winding lever 3 and the detent lever 4 pivot around the same imaginary axis B which corresponds to the midpoint of the leaf spring 2, but are free to pivot with respect to one another. In practice, the imaginary axis B is for example the axis of a rod (physical axis) driven into the winding lever 3, pivoting in bearings of the frame of the movement and around which the trigger lever 4 pivots. As a variant, however, the latches 3, 4 could be mounted on respective axes offset from one another, like the winding and detent levers described in the patent application. WO 99/64936 . In other variants, the rockers 3, 4 could not be mounted on physical axes but be guided around the same imaginary axis or two respective imaginary axes by flexible guidance systems.

Dans l'exemple représenté, le ressort-lame 2 est monobloc avec la bascule de détente 4 et est constitué de deux lames élastiques 2a, 2b ayant chacune une extrémité jointe à la bascule de détente 4 et une autre extrémité jointe au bâti du mouvement. Ladite autre extrémité de chaque lame élastique 2a, 2b peut être jointe au bâti du mouvement par l'intermédiaire d'un cadre extérieur (non représenté) entourant le ressort-lame 2 et fixé audit bâti, cadre extérieur qui peut être monobloc avec le ressort-lame 2, comme décrit dans les demandes de brevet WO 2009/118310 et CH 705674 . Le ressort-lame 2 peut aussi être une pièce rapportée par rapport à la bascule de détente 4 et au cadre extérieur.In the example shown, the leaf spring 2 is integral with the detent lever 4 and consists of two elastic leaves 2a, 2b each having one end joined to the detent lever 4 and another end joined to the frame of the movement. Said other end of each elastic blade 2a, 2b can be joined to the frame of the movement by means of an outer frame (not shown) surrounding the leaf spring 2 and fixed to said frame, which outer frame can be integral with the spring -blade 2, as described in the patent applications WO 2009/118310 and CH 705674 . The leaf spring 2 can also be a piece attached to the detent lever 4 and to the outer frame.

Le ressort-lame 2 présente deux convexités de sens opposés de part et d'autre de son point milieu et peut passer d'un premier état stable à un deuxième état stable en inversant le sens de chacune des deux convexités. A cet effet, le ressort-lame 2 est soit précontraint de manière à travailler en flambage soit préformé pour, à l'état de repos, présenter déjà deux convexités comme décrit dans la demande de brevet internationale WO 2017/032528 de la présente demanderesse. Dans le premier cas, le cadre extérieur est déformable pour permettre le flambage du ressort-lame 2. Dans le deuxième cas, le cadre extérieur est rigide. La bascule d'armage 3 comprend deux bras portant à leurs extrémités deux goupilles 3a, 3b engagées dans des œillets (non représentés) des deux lames élastiques 2a, 2b respectivement. Une configuration inverse est bien entendu possible où les goupilles 3a, 3b seraient portées par les lames élastiques 2a, 2b, respectivement, pour s'engager dans des œillets de la bascule d'armage 3. En outre, d'autres modes de liaison entre la bascule d'armage 3 et les lames élastiques 2a, 2b sont envisageables, par exemple deux goupilles à chaque extrémité de la bascule d'armage 3 pinçant la lame élastique 2a, 2b correspondante.The leaf spring 2 has two convexities of opposite directions on either side of its midpoint and can pass from a first stable state to a second stable state by reversing the direction of each of the two convexities. For this purpose, the leaf spring 2 is either pre-stressed so as to work in buckling or preformed to, in the rest state, already have two convexities as described in the international patent application. WO 2017/032528 of the present plaintiff. In the first case, the outer frame is deformable to allow buckling of the leaf spring 2. In the second case, the outer frame is rigid. The winding lever 3 comprises two arms carrying at their ends two pins 3a, 3b engaged in eyelets (not shown) of the two elastic blades 2a, 2b respectively. A reverse configuration is of course possible where the pins 3a, 3b would be carried by the elastic blades 2a, 2b, respectively, to engage in the eyelets of the winding lever 3. In addition, other connection modes between the winding lever 3 and the elastic blades 2a, 2b are possible, for example two pins at each end of the winding lever 3 clamping the corresponding elastic blade 2a, 2b.

La bascule d'armage 3 comprend en outre une partie 9 en forme d'anneau qui entoure l'étoile d'armage 6. La paroi intérieure 10 de cette partie 9 présente des éléments d'armage 11, 12 (cf. figure 2) constitués par des ergots, et est en outre conformée de manière irrégulière pour remplir une fonction de sécurité contre les chocs, c'est-à-dire empêcher une rotation de la bascule d'armage 3 au-delà d'un certain jeu lors d'un choc rotatif ou linéaire reçu par le mouvement d'horlogerie. A cet effet, la paroi intérieure 10 de la partie 9 suit sur sensiblement 360° la trajectoire du sommet de l'une quelconque des dents de l'étoile d'armage 6 dans un repère lié à la bascule d'armage 3 lors de la rotation de l'étoile d'armage 6 et des oscillations de la bascule d'armage 3 qui en résultent, afin de buter contre l'étoile d'armage 6 en cas de choc. De cette manière, le positionnement de la bascule d'armage 3 est garanti selon un faible jeu, prédéfini, et évite ainsi que la bascule d'armage 3 déclenche le basculement du ressort-lame 2 de manière intempestive.The winding lever 3 further comprises a part 9 in the form of a ring which surrounds the winding star 6. The inner wall 10 of this part 9 has winding elements 11, 12 (cf. figure 2 ) formed by lugs, and is furthermore shaped irregularly to fulfill a safety function against shocks, that is to say to prevent rotation of the winding lever 3 beyond a certain play during a rotary or linear shock received by the clockwork movement. To this end, the inner wall 10 of part 9 follows over substantially 360 ° the trajectory of the apex of any one of the teeth of the winding star 6 in a reference linked to the winding lever 3 during the rotation of the winding star 6 and of the oscillations of the winding lever 3 which result therefrom, in order to abut against the winding star 6 in the event of an impact. In this way, the positioning of the winding lever 3 is guaranteed according to a small, predefined play, and thus prevents the winding lever 3 from triggering the tilting of the leaf spring 2 in an untimely manner.

La bascule de détente 4 comprend un bras d'entrée 13 terminé par un bec d'entrée 14 et un bras de sortie 15 terminé par un bec de sortie 16. Ces becs d'entrée et de sortie 14, 16 sont agencés pour coopérer avec les dents 8 de la roue de verrouillage 7, comme cela sera expliqué ci-après. La bascule de détente 4 comprend aussi une baguette 17 se terminant en une fourchette 18 similaire à celle d'une ancre traditionnelle, comprenant une première corne 19 et une deuxième corne 20. La fourchette 18 est agencée pour coopérer avec une cheville de plateau 21 portée par un grand plateau 22 coaxial et solidaire du régulateur du mouvement. Le régulateur (non représenté) oscille autour d'un axe C, est par exemple de type balancier-spiral mais peut aussi être un oscillateur sans axe physique, à lames flexibles. Un dard 23 solidaire de la bascule de détente 4, et qui peut être monobloc avec cette dernière, est susceptible de coopérer avec un petit plateau 24 coaxial et solidaire du régulateur pour empêcher le renversement de la bascule de détente 4 en cas de choc. Des première et deuxième butées de limitation 25, 26 fixes par rapport au bâti du mouvement limitent le mouvement angulaire de la bascule de détente 4. Ces butées de limitation 25, 26 se présentent par exemple sous la forme de goupilles, comme représenté, ou d'étoqueaux. Elles peuvent être monobloc avec le cadre extérieur du ressort-lame 2.The detent lever 4 comprises an inlet arm 13 terminated by an inlet spout 14 and an outlet arm 15 terminated by an outlet spout 16. These inlet and outlet spouts 14, 16 are arranged to cooperate with the teeth 8 of the locking wheel 7, as will be explained below. The trigger lever 4 also includes a rod 17 ending in a fork 18 similar to that of a traditional anchor, comprising a first horn 19 and a second horn 20. The fork 18 is arranged to cooperate with a plate pin 21 carried by a large plate 22 coaxial and integral with the movement regulator. The regulator (not shown) oscillates around an axis C, is for example of the sprung balance type but can also be an oscillator without a physical axis, with flexible blades. A dart 23 integral with the trigger lever 4, and which can be integral with the latter, is able to cooperate with a small plate 24 coaxial and integral with the regulator to prevent the overturning of the trigger lever 4 in the event of an impact. First and second limitation stops 25, 26 fixed relative to the frame of the movement limit the angular movement of the trigger lever 4. These limitation stops 25, 26 are for example in the form of pins, as shown, or d 'stars. They can be integral with the outer frame of leaf spring 2.

L'échappement selon l'invention fonctionne selon des cycles correspondant chacun à une oscillation (deux alternances) du régulateur. Chaque cycle comprend deux demi-cycles. Chaque demi-cycle correspond à une alternance du régulateur et comprend les phases suivantes : armage, verrouillage, détente.The escapement according to the invention operates according to cycles each corresponding to an oscillation (two vibrations) of the regulator. Each cycle consists of two half cycles. Each half-cycle corresponds to an alternation of the regulator and includes the following phases: arming, locking, relaxation.

La phase d'armage du premier demi-cycle débute lorsqu'une dent 6a de l'étoile d'armage 6 rencontre un premier, 11, des éléments d'armage 11, 12 de la bascule d'armage 3 (cf. figure 1). En continuant son déplacement, la dent 6a pousse ce premier élément d'armage 11, ce qui fait pivoter la bascule d'armage 3 autour de son axe B dans le sens indiqué par la flèche F2. Ce mouvement de la bascule d'armage 3 arme le ressort-lame 2 en le faisant passer d'un premier état stable à un état métastable proche d'un état instable. Cette déformation du ressort-lame 2 est imperceptible dans la zone du point milieu, si bien que la bascule de détente 4 reste immobile.The winding phase of the first half-cycle begins when a tooth 6a of the winding star 6 meets a first, 11, of the winding elements 11, 12 of the winding lever 3 (cf. figure 1 ). By continuing to move, tooth 6a pushes this first winding element 11, which causes the winding lever 3 to pivot about its axis B in the direction indicated by arrow F2. This movement of the winding lever 3 arms the leaf spring 2 by making it pass from a first stable state to a metastable state close to an unstable state. This deformation of the leaf spring 2 is imperceptible in the region of the midpoint, so that the detent lever 4 remains stationary.

A la fin de l'armage (cf. figure 2) une dent 8a de la roue de verrouillage 7 vient au contact du bec d'entrée 14 de la bascule de détente 4, ce qui, par un phénomène de tirage, plaque la bascule de détente 4 contre la première butée de limitation 25 et bloque le mobile d'échappement 1 et avec lui le rouage de finissage. La phase de verrouillage est ainsi commencée. Durant cette phase de verrouillage, la bascule de détente 4 est positionnée de façon précise par la première butée de limitation 25. Ceci est un avantage par rapport à l'état de la technique ( WO 99/64936 , WO 2009/118310 et CH 705674 ) où la bascule de détente est positionnée par le taux de flambage du ressort-lame qui applique un couple de rotation à la bascule de détente contre une butée de limitation. Ce principe de l'état de la technique présente le défaut que sous l'action de l'armage du ressort-lame, la bascule de détente peut légèrement se déplacer et perdre le contact avec la butée de limitation. La bascule de détente peut ainsi vibrer lors de chocs ou en raison de la fréquence propre de l'ensemble comprenant la bascule de détente et le ressort-lame. Une telle vibration peut être néfaste car dans certains cas le dard associé à la bascule de détente peut frotter contre le petit plateau et freiner le régulateur. Pour éviter ce genre de vibration, on peut augmenter le taux de flambage mais au prix d'une diminution du rendement. La présente invention, par le tirage exercé sur la bascule de détente 4 par la roue de verrouillage 7, résout ou au moins atténue ce problème. De plus, la zone de verrouillage étant relativement proche de l'axe de rotation B de la bascule de détente 4, le couple de verrouillage est potentiellement plus faible que dans l'état de la technique.At the end of winding (cf. figure 2 ) a tooth 8a of the locking wheel 7 comes into contact with the inlet nose 14 of the trigger lever 4, which, by a pulling phenomenon, presses the trigger lever 4 against the first limit stop 25 and blocks the exhaust mobile 1 and with it the finishing gear. The locking phase has thus started. During this locking phase, the detent lever 4 is positioned precisely by the first limitation stop 25. This is an advantage over the state of the art ( WO 99/64936 , WO 2009/118310 and CH 705674 ) where the detent lever is positioned by the buckling rate of the leaf spring which applies rotational torque to the detent lever against a limiting stopper. This The principle of the state of the art has the defect that under the action of the winding of the leaf spring, the trigger lever can move slightly and lose contact with the limitation stop. The trigger lever can thus vibrate during shocks or because of the natural frequency of the assembly comprising the trigger lever and the leaf spring. Such a vibration can be harmful because in certain cases the dart associated with the trigger lever can rub against the small plate and slow down the regulator. To avoid this kind of vibration, we can increase the buckling rate but at the cost of a decrease in efficiency. The present invention, by the pull exerted on the trigger lever 4 by the locking wheel 7, solves or at least mitigates this problem. In addition, the locking zone being relatively close to the axis of rotation B of the detent lever 4, the locking torque is potentially lower than in the state of the art.

Ces phases d'armage et de verrouillage se produisent alors que le régulateur effectue son arc supplémentaire, c'est-à-dire pivote autour de son axe C sans interaction avec l'échappement. Pendant ces phases, la bascule d'armage 3 est sécurisée en position par l'élément d'armage 11 (dans un sens) et par la paroi intérieure 10 (dans les deux sens). Le ressort-lame 2 ne peut donc pas changer d'état intempestivement et la bascule d'armage 3 ne peut pas se déverrouiller intempestivement. A un instant déterminé après le verrouillage du mobile d'échappement 1, la cheville de plateau 21 percute la face interne de la première corne 19 de la fourchette 18 (cf. figure 3), provoquant un léger pivotement de la bascule de détente 4 dans le sens F2. Ce pivotement cause une déformation du ressort-lame 2 lui faisant dépasser son état instable. Le ressort-lame 2 libère alors l'énergie accumulée pendant l'armage en basculant dans son deuxième état stable, inverse du premier état stable. C'est la phase de détente. Cette brusque déformation du ressort-lame 2 fait pivoter la bascule de détente 4 dans le sens F2. Durant ce mouvement, le bec d'entrée 14 de la bascule de détente 4 quitte la dent 8a de la roue de verrouillage 7, en vainquant la force d'appui exercée sur ledit bec d'entrée 14 sous l'action de l'organe moteur du mouvement, et déverrouille le mobile d'échappement 1, puis la face interne de la deuxième corne 20 communique une impulsion à la cheville de plateau 21 et donc au régulateur (cf. figure 4). La phase de détente se termine lorsque la bascule de détente 4 arrive en butée contre la deuxième butée de limitation 26 (cf. figure 5) dans le deuxième état stable du ressort-lame 2.These winding and locking phases occur while the regulator performs its additional arc, that is to say pivots around its axis C without interaction with the escapement. During these phases, the arming latch 3 is secured in position by the arming element 11 (in one direction) and by the inner wall 10 (in both directions). The leaf spring 2 therefore cannot change state inadvertently and the winding lever 3 cannot inadvertently unlock. At a determined instant after the locking of the escape mobile 1, the plate pin 21 strikes the internal face of the first horn 19 of the fork 18 (cf. figure 3 ), causing a slight pivoting of the trigger lever 4 in the direction F2. This pivoting causes a deformation of the leaf spring 2 causing it to go beyond its unstable state. The leaf spring 2 then releases the energy accumulated during winding by switching to its second stable state, the reverse of the first stable state. This is the relaxation phase. This sudden deformation of the leaf spring 2 causes the detent lever 4 to pivot in the direction F2. During this movement, the inlet nose 14 of the detent lever 4 leaves the tooth 8a of the locking wheel 7, defeating the force support exerted on said inlet nozzle 14 under the action of the movement motor member, and unlocks the exhaust mobile 1, then the internal face of the second horn 20 communicates an impulse to the plate pin 21 and therefore to the regulator (cf. figure 4 ). The relaxation phase ends when the relaxation lever 4 comes into abutment against the second limit stop 26 (cf. figure 5 ) in the second steady state of leaf spring 2.

Après la phase de détente commence le deuxième demi-cycle, avec ses phases d'armage, de verrouillage et de détente se produisant dans le sens opposé à celui du premier demi-cycle. Ainsi, une dent 6b de l'étoile d'armage 6 entre en contact avec un deuxième, 12, des éléments d'armage 11, 12 de la bascule d'armage 3 et le pousse pour faire pivoter la bascule d'armage 3 dans un sens F3 opposé au sens F2 (cf. figure 6). Ce mouvement de la bascule d'armage 3 arme le ressort-lame 2 pour le faire passer de son deuxième état stable à un état métastable proche d'un état instable. Ensuite, une dent 8b de la roue de verrouillage 7 bute contre le bec de sortie 16 de la bascule de détente 4, ce qui plaque la bascule de détente 4 contre la deuxième butée de limitation 26 et bloque le mobile d'échappement 1 et avec lui le rouage de finissage (cf. figure 7). Puis, la cheville de plateau 21 percute la face interne de la deuxième corne 20 de la fourchette 18 (cf. figure 8), provoquant la détente du ressort-lame 2, le déverrouillage du mobile d'échappement 1 et la communication d'une impulsion à la cheville de plateau 21. A la fin de ce deuxième demi-cycle, le ressort-lame 2 retrouve son premier état stable, illustré à la figure 1.After the relaxation phase begins the second half-cycle, with its winding, locking and relaxation phases occurring in the opposite direction to that of the first half-cycle. Thus, a tooth 6b of the winding star 6 comes into contact with a second, 12, of the winding elements 11, 12 of the winding lever 3 and pushes it to make the winding lever 3 pivot in a direction F3 opposite to the direction F2 (cf. figure 6 ). This movement of the winding lever 3 arms the leaf spring 2 to make it pass from its second stable state to a metastable state close to an unstable state. Then, a tooth 8b of the locking wheel 7 abuts against the outlet spout 16 of the trigger lever 4, which presses the trigger lever 4 against the second limit stop 26 and blocks the exhaust mobile 1 and with him the finishing gear (cf. figure 7 ). Then, the plate pin 21 strikes the internal face of the second horn 20 of the fork 18 (cf. figure 8 ), triggering the relaxation of the leaf spring 2, the unlocking of the exhaust mobile 1 and the communication of an impulse to the plate pin 21. At the end of this second half-cycle, the leaf spring 2 regains its first stable state, shown on figure 1 .

Comme il ressort de la description ci-dessus, le verrouillage/déverrouillage du mobile d'échappement 1 dans la présente invention est effectué directement par la bascule de détente 4 au moyen des becs d'entrée et de sortie 14, 16, donc de manière statique, plutôt que par la bascule d'armage commandée par le ressort-lame lui-même commandé par la bascule de détente comme dans l'état de la technique. Dans la présente invention le ressort-lame 2 n'est utilisé que pour l'impulsion au régulateur. Cela permet de déverrouiller le mobile d'échappement 1 suffisamment tôt, c'est-à-dire avant que le régulateur n'atteigne sa position d'équilibre, pour laisser le ressort-lame 2 libre de fournir son impulsion au moment opportun, où le régulateur est proche de sa position d'équilibre. L'instant du début de l'impulsion peut dès lors être précis, ce qui favorise l'isochronisme du régulateur.As emerges from the above description, the locking / unlocking of the exhaust mobile 1 in the present invention is effected directly by the detent lever 4 by means of the inlet and outlet nozzles 14, 16, therefore so static, rather than by the winding lever controlled by the leaf spring itself controlled by the trigger lever as in the state of the art. In the present invention the leaf spring 2 is only used for the impulse to the regulator. This allows the escape mobile 1 to be unlocked early enough, i.e. before the governor reaches its equilibrium position, to leave leaf spring 2 free to provide its impetus at the appropriate time, when the governor is close to its equilibrium position . The instant of the start of the pulse can therefore be precise, which favors isochronism of the regulator.

De plus, l'utilisation d'un seul mobile d'échappement 1 comprenant les éléments d'armage 11, 12 supprime le besoin d'indexer deux mobiles d'échappement l'un par rapport à l'autre, donc facilite le montage, et réduit l'encombrement et l'inertie. En outre, la coopération entre les dents de l'étoile d'armage 6 et les éléments d'armage 11, 12 ne génère pas ou peu de frottements, contrairement aux cames d'armage du mécanisme selon les documents WO 99/64936 , WO 2009/118310 et CH 705674 , qui glissent sur des goupilles portées par la bascule d'armage. En effet, la coopération entre l'étoile d'armage 6 et les éléments d'armage 11, 12 est similaire à celle d'un engrenage, l'étoile d'armage 6 exerçant sur la paroi intérieure 10 un effort tangentiel.In addition, the use of a single exhaust mobile 1 comprising the winding elements 11, 12 eliminates the need to index two exhaust mobile relative to each other, therefore facilitates assembly, and reduces bulk and inertia. In addition, the cooperation between the teeth of the winding star 6 and the winding elements 11, 12 generates little or no friction, unlike the mechanism winding cams according to documents. WO 99/64936 , WO 2009/118310 and CH 705674 , which slide on pins carried by the winding lever. Indeed, the cooperation between the winding star 6 and the winding elements 11, 12 is similar to that of a gear, the winding star 6 exerting a tangential force on the inner wall 10.

La présente invention a été décrite ci-dessus à titre d'exemple uniquement. Il va de soi que des modifications pourraient être faites sans sortir de l'objet revendiqué. Par exemple, l'étoile d'armage 6 et la roue de verrouillage 7 pourraient former une seule pièce sur un seul niveau. Dans ce cas, les dents de l'étoile 6 assureraient dans certaines positions l'armage et dans d'autres positions le verrouillage. L'organe élastique bistable que constitue le ressort-lame 2 pourrait être formé d'une seule lame élastique 2a ou 2b et la bascule d'armage 3 pourrait comprendre un seul bras coopérant par son extrémité avec la lame élastique. Dans des variantes, l'organe élastique bistable pourrait comprendre plusieurs ressorts-lames comprenant chacun une ou plusieurs lames élastiques. Selon une autre modification, le mobile d'échappement 1 pourrait être situé de l'autre côté du régulateur voire être coaxial audit régulateur (c'est-à-dire à l'axe C).The present invention has been described above by way of example only. It goes without saying that modifications could be made without departing from the object claimed. For example, the winding star 6 and the locking wheel 7 could form a single piece on one level. In this case, the teeth of the star 6 would ensure in certain positions the winding and in other positions the locking. The bistable elastic member constituted by the leaf spring 2 could be formed from a single elastic leaf 2a or 2b and the winding lever 3 could comprise a single arm cooperating at its end with the elastic leaf. In variants, the bistable elastic member could comprise several leaf springs each comprising one or more elastic leaves. According to another modification, the exhaust mobile 1 could be located on the other side of the regulator or even be coaxial with said regulator (that is to say with the axis C).

Claims (6)

  1. Timepiece escapement comprising a bistable elastic member (2), a winding lever (3) arranged to wind the bistable elastic member (2) during winding phases, and a detent lever (4) arranged to be driven by a detent of the bistable elastic member (2) after each winding phase in order to communicate an impulse to a regulator, characterised in that it comprises a single escapement mobile (1) to drive the winding lever (3) during the winding phases, the escapement mobile (1) comprising a winding member (6) arranged to cooperate with winding elements (11, 12) of the winding lever (3), in the manner of a gear, in order to cause the winding lever (3) to pivot in an alternating manner in opposing directions.
  2. Timepiece escapement as claimed in claim 1, characterised in that the winding elements (11, 12) are defined by an inner wall (10) of a part (9) of the winding lever (3) which surrounds the winding member (6).
  3. Timepiece escapement as claimed in claim 2, characterised in that said inner wall (10) follows through substantially 360° the trajectory of the tip of a tooth of the winding member (6) in a guide-mark linked to the winding lever (3) during the rotation of the winding member (6), in order to abut against the winding member (6) in the event of an impact and thus secure the position of the winding lever (3).
  4. Timepiece escapement as claimed in any one of claims 1 to 3, characterised in that the winding elements (11, 12) are catches.
  5. Timepiece escapement as claimed in any one of claims 1 to 4, characterised in that the winding member (6) is a star.
  6. Timepiece escapement as claimed in any one of claims 1 to 5, characterised in that the detent lever (4) is arranged to cooperate with the bistable elastic member (2) in the region of a middle point (B) of the bistable elastic member (2) and the winding lever (3) is arranged to cooperate with the bistable elastic member (2) on both sides (3a, 3b) of said region.
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PCT/IB2017/053668 WO2018002773A1 (en) 2016-06-27 2017-06-20 Timepiece escapement

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Publication number Priority date Publication date Assignee Title
EP1084459A1 (en) 1998-06-08 2001-03-21 Manufacture des Montres Rolex S.A. Method for transmitting bursts of mechanical energy from a power source to an oscillating regulator
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EP3475765A1 (en) 2019-05-01
WO2018002773A1 (en) 2018-01-04

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