EP3470934B1 - Shock absorbing system with angular locking - Google Patents

Shock absorbing system with angular locking Download PDF

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Publication number
EP3470934B1
EP3470934B1 EP17195675.8A EP17195675A EP3470934B1 EP 3470934 B1 EP3470934 B1 EP 3470934B1 EP 17195675 A EP17195675 A EP 17195675A EP 3470934 B1 EP3470934 B1 EP 3470934B1
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EP
European Patent Office
Prior art keywords
spring ring
shock
support
notch
rim
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP17195675.8A
Other languages
German (de)
French (fr)
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EP3470934A1 (en
Inventor
Antonio Merino
Thierry Conus
Ivan Villar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA Manufacture Horlogere Suisse SA
Original Assignee
ETA Manufacture Horlogere Suisse SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by ETA Manufacture Horlogere Suisse SA filed Critical ETA Manufacture Horlogere Suisse SA
Priority to EP17195675.8A priority Critical patent/EP3470934B1/en
Priority to JP2018179007A priority patent/JP6557390B2/en
Priority to CN201811172481.9A priority patent/CN109656120B/en
Priority to US16/156,115 priority patent/US11169487B2/en
Publication of EP3470934A1 publication Critical patent/EP3470934A1/en
Application granted granted Critical
Publication of EP3470934B1 publication Critical patent/EP3470934B1/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/02—Shock-damping bearings
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/04—Mounting the clockwork in the case; Shock absorbing mountings
    • G04B37/05—Fixed mountings for pocket or wrist watches
    • G04B37/052—Fixed mountings for pocket or wrist watches with shock damping means not related to the winding stem
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/02—Shock-damping bearings
    • G04B31/04—Shock-damping bearings with jewel hole and cap jewel
    • 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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • 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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton

Definitions

  • the present invention relates to a shock-absorbing device also called an anti-shock system for an axis of a moving body of a micromechanical device, in particular but not exclusively a clockwork movement.
  • the shock-absorbing device comprises a support in which is provided a housing intended to receive a pivot system for maintaining with a pre-established movement a shank of the axis.
  • the shock-absorbing device further comprises elastic means arranged to exert on the pivot system at least an axial elastic return force.
  • the technical field of the invention is the technical field of fine mechanics.
  • the present invention relates to a shock absorbing device for an axis arranged in a micromechanical mechanism, in particular in a mechanical or electromechanical clockwork movement.
  • shock-absorbing devices also called “shock-absorbing bearings” or “shock-absorbing systems” have been known for a long time by manufacturers of mechanical watches.
  • the purpose of these shock-absorbing devices is to allow an axis to absorb the energy resulting from an impact, in particular from a side impact, by allowing it to temporarily deviate from its rest position, then to return to this rest position under the effect of an elastic return force. It will be understood that, in micromechanical mechanisms in general, and in clock movements in particular, most of the axes extend vertically with respect to the plane in which such micromechanical mechanisms or clock movements extend.
  • a clockwork movement can therefore essentially undergo two different types of shocks: either an axial shock, if the watch falls substantially flat on a surface; or a side impact, if the watch falls on the side of the caseband.
  • the side impact is the more annoying.
  • the force resulting from this shock is exerted substantially perpendicularly to the back of the watch, and therefore approximately parallel to the direction in which the axes of the clockwork movement extend.
  • the risks that these axes become dislodged or broken are therefore quite limited.
  • the force resulting from the impact is exerted in a direction approximately perpendicular to the axes, so that the risk of the axes coming out of their housing and / or breaking is high.
  • shock-absorbing devices also called shock-absorbing systems.
  • shock absorbing devices comprise a support having a base without a bottom to allow passage to an axis terminated by a tigeron.
  • the support receives a kitten which is a part of generally annular shape and which supports in a stepped manner a pierced stone crossed by the shank of the axis and a counter-pivot stone.
  • the assembly formed by the kitten, the pierced stone and the counter-pivot stone is held elastically in the support by means of a spring element mounted on the support in a removable manner and which exerts on the counter-pivot stone an elastic force of tackle.
  • shock-absorbing devices are in particular marketed under the brand Incabloc®.
  • the spring element it can in particular be made of brass or else with a spring steel such as the austenitic cobalt-chrome grade sold. under the brand Phynox ⁇ KL, and is conventionally obtained by cutting techniques.
  • the axis will be offset and will come up against the base of the support, which causes the off-center of the pierced stone and, consequently, of the kitten and the counter-pivot stone.
  • the spring element brings all the elements back to their equilibrium position.
  • FIG. 1 and 2 appended to the present patent application schematically illustrate a shock-absorbing device which is currently used in timepieces on the market.
  • This shock-absorbing device is described in detail in the European patent application published under the number EP 3220211 on behalf of the Claimant.
  • the shock-absorbing device also called an anti-shock system
  • the shock-absorbing device 1 may in particular be mounted in an element of a timepiece movement such as a plate or a bridge.
  • This shock-absorbing device 1 comprises in particular a support 2 which is in the form of a cup 4, a base 6 of which has no bottom and which is delimited at its periphery by a first rim 8. It will be noted that the cup 4 and the first flange 8 can be made in one piece, or else be separate pieces assembled together.
  • the first flange 8 On the side opposite to the base 6 of the cup 4, the first flange 8 comprises an upper surface 10 extended, on the interior side of the cup 4, by an internal wall 12, and on the exterior side of the cup by an external wall 14.
  • the first flange 8 defines with the cup 4 a housing 16 in which a pivot module 18 is inserted.
  • This pivot module 18 comprises a chaton 20, that is to say a part comprising a circular central orifice 22 and a second flange 24 delimited by an outer side wall 26 and an inner side wall 28.
  • a pierced stone 30 is inserted, the diameter of which corresponds to that of the circular central orifice 22.
  • the internal side wall 28 of the kitten 20 it is provided with a shoulder 32 on which is placed a counter-pivot stone 34.
  • the pivot module 18 thus arranged is placed in the housing 16 of the support 2, then the assembly thus obtained is inserted, for example in an orifice of a watch plate or in one of the bridges of a watch movement.
  • the pivot module 18 is arranged to cooperate with a shank 36 of an axis 38.
  • the shock-absorbing device 1 further comprises elastic means 40 provided to cooperate with the pivot module 18 in order to absorb the shocks and return the pivot module 18 to its rest position when the stresses induced by the shocks fade.
  • elastic means 40 are fixed on the support 2 and are preferably also in contact with the pivot module 18.
  • the elastic means 40 are in the form of a spring ring 42 of the flat type, that is to say cut from a strip or a ribbon of which a width is significantly greater than the thickness.
  • This spring ring 42 is metallic and circular in shape, centered on a point C.
  • the spring ring 42 comprises for example three regularly spaced arms 44 which extend radially towards the center C of this spring ring 42. These three arms 44 allow the spring ring 42 to press the pivot module 18 into the housing 16 support 2.
  • a bayonet system 46 For mounting the spring ring 42 on the support 2, a bayonet system 46 is used.
  • This bayonet system 46 comprises a peripheral bearing surface 48 which extends from the first flange 8 of the support 2 towards the center of this support. 2.
  • a circular groove 50 is formed in the internal wall 12 of the first flange 8, under the peripheral bearing surface 48, to define a holding zone.
  • the spring ring 42 is provided on its outer periphery with three regularly spaced lugs 52 which extend radially opposite the center ⁇ of this spring ring 42. As can be seen in Drawing, each of these three lugs 52 is arranged between two consecutive arms 44 of the spring ring 42. The three lugs 52 deliberately give the spring ring 42 an outer diameter which exceeds the inner diameter of the peripheral bearing surface 48. By Therefore, to allow the mounting of the spring ring 42 on the support 2, there are provided in the peripheral surface 48 of the first notches 54, three in number, which open into the circular groove 50.
  • the notches 54 are typically produced by a forging operation of the peripheral bearing surface 48 which reveals the circular arc portions 55. At each of the ends of the circular arc portions 55, the material is locally pushed back during the operation. forging, which forms hollows 57a on top of these arcuate portions 55, and bosses 57b below the arcuate portions 55. These bosses 57b contribute to maintaining the spring ring 52 when the latter. ci is introduced into the circular groove 50, under the arcuate portions 55 of the peripheral bearing surface 48.
  • the mounting of the spring ring 42 occurs after the step aimed at placing the pivot module 18 in its housing 16.
  • the pivot module 18 exerts on this spring ring 42 a force which tends to push back this spring ring 42.
  • the spring ring 42 tends to deform elastically, but is not driven from its housing 16 thanks to the presence of the pins 52 inserted in the circular groove 50 which absorb the mechanical stresses and oppose the movement of the spring ring 42.
  • the lugs 52 define passive zones of the spring ring 42, the presence of these lugs 52 and the mechanical stresses that they absorb have no effect on the behavior of the spring ring 42. Consequently, the behavior of the spring ring 42 is not modified when the latter is mounted on the support 2.
  • a shock-absorbing device is intended to allow a micromechanical axis, for example housed in a watch movement, to absorb without breaking the energy resulting from an impact, in particular from a side impact. , by allowing this axis to move momentarily under the effect of a shock before returning it elastically to its rest position.
  • the spring ring 42 is nevertheless capable of pivoting on itself and it is quite possible that it finds itself in a situation in which the three lugs 52 are in the first three corresponding notches 54. In such a situation, the spring ring 42 can be decoupled from the support 2.
  • the axis 38 is then no longer held by the shock-absorbing device 1, which inevitably leads to the breakdown of the mechanical device, for example a watchmaker, in which is installed this shock-absorbing device 1.
  • the shock-absorbing devices are mainly installed in watches which belong to the upper segment of the market.
  • countersinking is understood to mean the action of raising the lower surface of the peripheral bearing surface 48 by removing material by means of a rotating blade. Thanks to this counterbore action, it is possible to partially reduce the thickness of a third flange 56 of the peripheral bearing surface 48 and to create, between two successive notches 54, clearances 58 in which the lugs 52 are housed.
  • the object of the present invention is to solve the above-mentioned problems as well as others still by proposing a shock-absorbing device in which the risks of its various components falling apart in the event of an axial or lateral impact are considerably reduced, or even eliminated.
  • the present invention relates to a shock-absorbing device for an axis of a mobile of a micromechanical device, in particular a clockwork movement, this shock-absorbing device comprising a support which comprises a cup, one base of which is without a bottom and which is delimited at its periphery by a rim, the rim comprising an extended upper surface, on an inner side of the cup, by an internal wall, and, on an outer side of the cup, by a wall external, the rim of the cup defining a housing in which a pivot module is inserted, this pivot module comprising a kitten having a central orifice in which is inserted a pierced stone which corresponds in shape and dimensions to those of the central orifice, a counter-pivot stone being placed on the kitten, above the pierced stone, the shock-absorbing device also comprising a spring ring arranged between the support and the pivot module for exert an elastic stress on this pivot module, the shock-absorbing device being provided with a bayonet system for
  • the present invention provides a shock absorbing device in which second notches are cut in the rim of the peripheral bearing surface. This moves away from the circular profile of the rim of the peripheral bearing surface, which allows the lugs of the spring ring to adopt a position of least constraint under the lower surface of the peripheral rim, and to abut against the ridges which delimit the profile of these second notches.
  • the spring ring is thus locked in angular pivoting, which makes it possible to guarantee that in the event of an impact, in particular lateral, the risks that the axes of the moving parts disengage completely are limited, or even zero.
  • Another advantage of the invention lies in the fact that the notches are very easy to machine, for example by stamping or cutting.
  • the present invention proceeds from the general inventive idea which consists in cutting in the edge of the peripheral bearing surface of the support of a shock-absorbing device notches intended to receive the locking pins of a spring ring intended to force the stone. counter-pivot in the direction of the pierced stone which guides the tigeron of a mobile axis.
  • These notches for example produced by stamping or cutting, are easier to machine, so that the cost price of the resulting supports is lower than in the past.
  • the notches are cut from the full thickness of the rim, the locking of the lugs against the ridges which define the contour of these notches is optimal.
  • great freedom is enjoyed with regard to the shape that can be given to these notches, which, for each spring ring geometry, allows to find the shape of the notches guaranteeing the best locking of this spring ring.
  • the shock-absorbing device according to the invention is in all respects identical to the shock-absorbing device of the prior art described above, with the notable difference that the edge of the peripheral bearing surface of the support is partially cut out according to notches which allow the locking of the lugs of the spring ring, and therefore the angular pivoting locking of the latter. It will therefore be understood that, in what follows, the elements identical to those described in connection with the figures 1 and 2 will be designated by the same reference numerals.
  • this shock-absorbing device comprises in particular a spring ring 42 of the flat type provided with at least one and, in the example shown, three arms 44 which are regularly spaced apart which extend radially. towards the center C of this spring ring 42. These three arms 44 allow the spring ring 42 to press the pivot module 18 into the housing 16 of the support 2.
  • a bayonet system 46 is used which comprises a peripheral bearing surface 48 extending from the first flange 8 of the support 2 towards the center of this support 2. Furthermore, a circular groove 50 is formed in the internal wall 12 of the first flange 8, under the peripheral bearing surface 48, to define a holding zone .
  • the spring ring 42 is provided on its outer periphery with at least one and, in the example shown, three regularly spaced lugs 52 which extend radially away from the center. ⁇ of this spring ring 42. As can be seen in the drawing, these three lugs 52 are arranged angularly offset with respect to the three arms 44 of the spring ring 42, preferably at an equal angular distance from two consecutive arms 44.
  • the three lugs 52 give the spring ring 42 an outer diameter which exceeds the inner diameter D of the peripheral bearing surface 48. Consequently, to allow the spring ring 42 to be mounted on the support 2, it is provided in the peripheral bearing surface 48 of the first notches 54, three in number, which open into the circular groove 50. These first three notches 54 are arranged with the same angular spacing as the lugs 52. Consequently, to mount the spring ring 42 on the support 2, it suffices to present it so that the three lugs 52 are found opposite the first three corresponding notches 54, then to rotate it in order to allow the lugs 52 to slide inside the circular groove 50, under the peripheral range 48.
  • the notches 54 are typically produced by a forging operation of the peripheral bearing surface 48 which reveals the circular arc portions 55. At each of the ends of the circular arc portions 55, the material is locally pushed back during the operation. forging, which forms hollows 57a on top of these arcuate portions 55, and bosses 57b below the arcuate portions 55. These bosses 57b contribute to the retention of the spring ring 52 when the latter is introduced into the circular groove 50, under the arcuate portions 55 of the peripheral bearing surface 48.
  • the mounting of the spring ring 42 occurs after the step aimed at placing the pivot module 18 in its housing 16.
  • the pivot module 18 exerts on this spring ring 42 a force which tends to push back this spring ring 42.
  • the spring ring 42 tends to deform elastically, but is not driven from its housing 16 thanks to the presence of the pins 52 inserted in the circular groove 50 which absorb the mechanical stresses and oppose the movement of the spring ring 42.
  • the lugs 52 define passive zones of the spring ring 42, the presence of these lugs 52 and the mechanical stresses that they absorb have no effect on the behavior of the spring ring 42. Consequently, the behavior of the spring ring 42 is not modified when the latter is mounted on the support 2.
  • second notches 62 are machined, for example for example by cutting or stamping, in the third flange 56 of the peripheral bearing surface 48 of the support 2.
  • the second notches 62 are cut in the third rim 56 of the peripheral bearing surface 48 of the support 2, over the entire thickness of this third rim 56 and biting on the perimeter of this third rim 56.
  • these second notches 62 are sufficiently deep and their ridges 64 sufficiently high to ensure the proper locking of the lugs 52 and the immobilization of the spring ring 42 in angular pivoting in the event of an impact.
  • these second notches 62 are very easy to machine and their profile can therefore be adapted as best as possible in order to guarantee optimum locking.
  • the second notches 62 have been obtained by cutting the peripheral bearing surface 48 according to a circle of small radius whose center C1 is on the bisector of the angle ⁇ which extends between two first successive notches 54.
  • the second notches 62 were obtained by cutting the peripheral bearing area along a circle of greater radius whose center C2 is also located on the bisector of the angle which extends between two first successive notches 54.

Description

La présente invention concerne un dispositif amortisseur de chocs encore appelé système antichoc pour un axe d'un mobile d'un dispositif micromécanique, en particulier mais non exclusivement un mouvement d'horlogerie. Le dispositif amortisseur de chocs comprend un support dans lequel est prévu un logement destiné à recevoir un système pivot pour maintenir avec un débattement préétabli un tigeron de l'axe. Le dispositif amortisseur de chocs comprend en outre des moyens élastiques agencés pour exercer sur le système pivot au moins une force axiale de rappel élastique.The present invention relates to a shock-absorbing device also called an anti-shock system for an axis of a moving body of a micromechanical device, in particular but not exclusively a clockwork movement. The shock-absorbing device comprises a support in which is provided a housing intended to receive a pivot system for maintaining with a pre-established movement a shank of the axis. The shock-absorbing device further comprises elastic means arranged to exert on the pivot system at least an axial elastic return force.

Le domaine technique de l'invention est le domaine technique de la mécanique fine.The technical field of the invention is the technical field of fine mechanics.

Arrière-plan technologique de l'inventionTechnological background of the invention

La présente invention concerne un dispositif amortisseur de chocs pour un axe agencé dans un mécanisme de micromécanique, en particulier dans un mouvement d'horlogerie mécanique ou électromécanique. De tels dispositifs amortisseurs de chocs, encore appelés « paliers amortisseurs de chocs » ou « systèmes antichocs » sont connus de longue date par les constructeurs de montres mécaniques. Ces dispositifs amortisseurs de chocs ont pour but de permettre à un axe d'absorber l'énergie résultant d'un choc, en particulier d'un choc latéral, en l'autorisant à s'écarter momentanément de sa position de repos, puis à retourner à cette position de repos sous l'effet d'une force élastique de rappel. On comprendra que, dans les mécanismes de micromécanique en général, et dans les mouvements d'horlogerie en particulier, la plupart des axes s'étendent verticalement par rapport au plan dans lequel de tels mécanismes de micromécanique ou mouvements d'horlogerie s'étendent. Un mouvement d'horlogerie peut donc subir essentiellement deux types de chocs différents : soit un choc axial, si la montre tombe sensiblement à plat sur une surface ; soit un choc latéral, si la montre tombe sur le côté de la carrure. Des deux types de chocs, le choc latéral est le plus gênant. En effet, dans le cas d'un choc axial, la force résultant de ce choc s'exerce sensiblement perpendiculairement au fond de la montre, et donc approximativement parallèlement à la direction dans laquelle s'étendent les axes du mouvement d'horlogerie. Les risques que ces axes se déboitent ou cassent sont donc assez limités. Par contre, en cas de choc latéral, la force résultant du choc s'exerce selon une direction approximativement perpendiculaire aux axes, de sorte que le risque que les axes sortent de leur logement et/ou se cassent est élevé.The present invention relates to a shock absorbing device for an axis arranged in a micromechanical mechanism, in particular in a mechanical or electromechanical clockwork movement. Such shock-absorbing devices, also called “shock-absorbing bearings” or “shock-absorbing systems” have been known for a long time by manufacturers of mechanical watches. The purpose of these shock-absorbing devices is to allow an axis to absorb the energy resulting from an impact, in particular from a side impact, by allowing it to temporarily deviate from its rest position, then to return to this rest position under the effect of an elastic return force. It will be understood that, in micromechanical mechanisms in general, and in clock movements in particular, most of the axes extend vertically with respect to the plane in which such micromechanical mechanisms or clock movements extend. A clockwork movement can therefore essentially undergo two different types of shocks: either an axial shock, if the watch falls substantially flat on a surface; or a side impact, if the watch falls on the side of the caseband. Of the two types of impact, the side impact is the more annoying. In fact, in the case of an axial shock, the force resulting from this shock is exerted substantially perpendicularly to the back of the watch, and therefore approximately parallel to the direction in which the axes of the clockwork movement extend. The risks that these axes become dislodged or broken are therefore quite limited. On the other hand, in the event of a side impact, the force resulting from the impact is exerted in a direction approximately perpendicular to the axes, so that the risk of the axes coming out of their housing and / or breaking is high.

Pour résoudre ce problème, les constructeurs de montres mécaniques et autres mécanismes de micromécanique ont donc proposé des dispositifs amortisseurs de chocs, encore appelés systèmes antichocs. Brièvement résumé, de tels dispositifs amortisseurs de chocs comprennent un support dont une base est dépourvue de fond pour laisser le passage à un axe terminé par un tigeron. Le support reçoit un chaton qui est une pièce de forme générale annulaire et qui supporte de manière étagée une pierre percée traversée par le tigeron de l'axe et une pierre contre-pivot. L'ensemble formé par le chaton, la pierre percée et la pierre contre-pivot est maintenu élastiquement dans le support au moyen d'un élément ressort monté sur le support de manière amovible et qui exerce sur la pierre contre-pivot une force élastique de plaquage. De tels dispositifs amortisseurs de chocs sont notamment commercialisés sous la marque Incabloc®. Quant à l'élément ressort, il peut notamment être réalisé en laiton ou bien avec un acier ressort tel que la nuance austénitique cobalt-chrome commercialisée sous la marque Phynox©KL, et est classiquement obtenu par des techniques de découpage.To solve this problem, the manufacturers of mechanical watches and other micromechanical mechanisms have therefore proposed shock-absorbing devices, also called shock-absorbing systems. Briefly summarized, such shock absorbing devices comprise a support having a base without a bottom to allow passage to an axis terminated by a tigeron. The support receives a kitten which is a part of generally annular shape and which supports in a stepped manner a pierced stone crossed by the shank of the axis and a counter-pivot stone. The assembly formed by the kitten, the pierced stone and the counter-pivot stone is held elastically in the support by means of a spring element mounted on the support in a removable manner and which exerts on the counter-pivot stone an elastic force of tackle. Such shock-absorbing devices are in particular marketed under the brand Incabloc®. As for the spring element, it can in particular be made of brass or else with a spring steel such as the austenitic cobalt-chrome grade sold. under the brand Phynox © KL, and is conventionally obtained by cutting techniques.

En cas de choc axial, la pierre percée, la pierre contre-pivot et l'axe se déplacent sensiblement perpendiculairement au fond de la montre, à l'encontre de la force élastique de rappel de l'élément ressort qui ramène tout cet équipage en position de repos.In the event of an axial impact, the pierced stone, the counter-pivot stone and the axis move substantially perpendicular to the back of the watch, against the elastic return force of the spring element which brings all this crew back to rest position.

En cas de choc latéral, l'axe va être désaxé et va venir buter contre la base du support, ce qui provoque le décentrage de la pierre percée et, par suite, du chaton et de la pierre contre-pivot. Dans ce cas aussi, l'élément ressort ramène tous les éléments dans leur position d'équilibre.In the event of a side impact, the axis will be offset and will come up against the base of the support, which causes the off-center of the pierced stone and, consequently, of the kitten and the counter-pivot stone. In this case too, the spring element brings all the elements back to their equilibrium position.

Les figures 1 et 2 annexées à la présente demande de brevet illustrent de manière schématique un dispositif amortisseur de chocs qui est actuellement utilisé dans des pièces d'horlogerie se trouvant sur le marché. Ce dispositif amortisseur de chocs est décrit en détail dans la demande de brevet européen publiée sous le numéro EP 3220211 au nom de la Demanderesse.The figures 1 and 2 appended to the present patent application schematically illustrate a shock-absorbing device which is currently used in timepieces on the market. This shock-absorbing device is described in detail in the European patent application published under the number EP 3220211 on behalf of the Claimant.

Désigné dans son ensemble par la référence numérique générale 1, le dispositif amortisseur de chocs, encore appelé système antichoc, peut notamment être monté dans un élément d'un mouvement de pièce d'horlogerie tel qu'une platine ou un pont. Ce dispositif amortisseur de chocs 1 comprend notamment un support 2 qui se présente sous la forme d'une coupelle 4 dont une base 6 est dépourvue de fond et qui est délimitée à sa périphérie par un premier rebord 8. On notera que la coupelle 4 et le premier rebord 8 peuvent être faits d'une seule pièce, ou bien être des pièces séparées assemblées l'une à l'autre.Designated as a whole by the general reference numeral 1, the shock-absorbing device, also called an anti-shock system, may in particular be mounted in an element of a timepiece movement such as a plate or a bridge. This shock-absorbing device 1 comprises in particular a support 2 which is in the form of a cup 4, a base 6 of which has no bottom and which is delimited at its periphery by a first rim 8. It will be noted that the cup 4 and the first flange 8 can be made in one piece, or else be separate pieces assembled together.

Du côté opposé à la base 6 de la coupelle 4, le premier rebord 8 comprend une surface supérieure 10 prolongée, du côté intérieur de la coupelle 4, par une paroi interne 12, et du côté extérieur de la coupelle par une paroi externe 14.On the side opposite to the base 6 of the cup 4, the first flange 8 comprises an upper surface 10 extended, on the interior side of the cup 4, by an internal wall 12, and on the exterior side of the cup by an external wall 14.

Le premier rebord 8 définit avec la coupelle 4 un logement 16 dans lequel un module pivot 18 est inséré. Ce module pivot 18 comprend un chaton 20, c'est-à-dire une pièce comprenant un orifice central circulaire 22 et un deuxième rebord 24 délimité par une paroi latérale externe 26 et une paroi latérale interne 28. Dans l'orifice central circulaire 22 est insérée une pierre percée 30 dont le diamètre correspond à celui de l'orifice central circulaire 22. Quant à la paroi latérale interne 28 du chaton 20, elle est munie d'un épaulement 32 sur lequel est posée une pierre contre-pivot 34.The first flange 8 defines with the cup 4 a housing 16 in which a pivot module 18 is inserted. This pivot module 18 comprises a chaton 20, that is to say a part comprising a circular central orifice 22 and a second flange 24 delimited by an outer side wall 26 and an inner side wall 28. In the circular central hole 22 A pierced stone 30 is inserted, the diameter of which corresponds to that of the circular central orifice 22. As for the internal side wall 28 of the kitten 20, it is provided with a shoulder 32 on which is placed a counter-pivot stone 34.

Le module pivot 18 ainsi agencé est placé dans le logement 16 du support 2, puis l'ensemble ainsi obtenu est inséré, par exemple dans un orifice d'une platine horlogère ou dans l'un des ponts d'un mouvement horloger. Le module pivot 18 est agencé pour coopérer avec un tigeron 36 d'un axe 38.The pivot module 18 thus arranged is placed in the housing 16 of the support 2, then the assembly thus obtained is inserted, for example in an orifice of a watch plate or in one of the bridges of a watch movement. The pivot module 18 is arranged to cooperate with a shank 36 of an axis 38.

Le dispositif amortisseur de chocs 1 comprend en outre des moyens élastiques 40 prévus pour coopérer avec le module pivot 18 afin d'amortir les chocs et ramener le module pivot 18 dans sa position de repos lorsque les contraintes induites par les chocs s'estompent. Ces moyens élastiques 40 sont fixés sur le support 2 et sont, de préférence, également en contact avec le module pivot 18.The shock-absorbing device 1 further comprises elastic means 40 provided to cooperate with the pivot module 18 in order to absorb the shocks and return the pivot module 18 to its rest position when the stresses induced by the shocks fade. These elastic means 40 are fixed on the support 2 and are preferably also in contact with the pivot module 18.

Dans un mode de réalisation donné à titre d'exemple seulement, les moyens élastiques 40 se présentent sous la forme d'un anneau ressort 42 de type plat, c'est-à-dire découpé dans une bande ou un ruban dont une largeur est sensiblement supérieure à l'épaisseur. Cet anneau ressort 42 est métallique et de forme circulaire, centré sur un point C.In one embodiment given by way of example only, the elastic means 40 are in the form of a spring ring 42 of the flat type, that is to say cut from a strip or a ribbon of which a width is significantly greater than the thickness. This spring ring 42 is metallic and circular in shape, centered on a point C.

Comme on peut le voir à l'examen des figures 1 et 2, l'anneau ressort 42 comprend par exemple trois bras 44 régulièrement espacés qui s'étendent radialement vers le centre C de cet anneau ressort 42. Ces trois bras 44 permettent à l'anneau ressort 42 de plaquer le module pivot 18 dans le logement 16 du support 2.As can be seen from an examination of figures 1 and 2 , the spring ring 42 comprises for example three regularly spaced arms 44 which extend radially towards the center C of this spring ring 42. These three arms 44 allow the spring ring 42 to press the pivot module 18 into the housing 16 support 2.

Pour le montage de l'anneau ressort 42 sur le support 2, on utilise un système à baïonnette 46. Ce système à baïonnette 46 comprend une portée périphérique 48 qui s'étend depuis le premier rebord 8 du support 2 vers le centre de ce support 2. Par ailleurs, une gorge circulaire 50 est ménagée dans la paroi interne 12 du premier rebord 8, sous la portée périphérique 48, pour définir une zone de maintien.For mounting the spring ring 42 on the support 2, a bayonet system 46 is used. This bayonet system 46 comprises a peripheral bearing surface 48 which extends from the first flange 8 of the support 2 towards the center of this support. 2. Furthermore, a circular groove 50 is formed in the internal wall 12 of the first flange 8, under the peripheral bearing surface 48, to define a holding zone.

Pour coopérer avec le système à baïonnette 46, l'anneau ressort 42 est muni sur sa périphérie extérieure de trois ergots 52 régulièrement espacés qui s'étendent radialement à l'opposé du centre Ç de cet anneau ressort 42. Comme on peut le voir au dessin, chacun de ces trois ergots 52 est disposé entre deux bras 44 consécutifs de l'anneau ressort 42. Volontairement, les trois ergots 52 confèrent à l'anneau ressort 42 un diamètre extérieur qui excède le diamètre intérieur de la portée périphérique 48. Par conséquent, pour permettre le montage de l'anneau ressort 42 sur le support 2, il est prévu dans la portée périphérique 48 des premières encoches 54 au nombre de trois qui débouchent dans la gorge circulaire 50. Par suite, pour monter l'anneau ressort 42 sur le support 2, il suffit de le présenter de sorte que les trois ergots 52 s'engagent dans les trois premières encoches 54 correspondantes, puis de le faire pivoter afin de permettre aux ergots 52 de glisser à l'intérieur de la gorge circulaire 50, sous la portée périphérique 48.To cooperate with the bayonet system 46, the spring ring 42 is provided on its outer periphery with three regularly spaced lugs 52 which extend radially opposite the center Ç of this spring ring 42. As can be seen in Drawing, each of these three lugs 52 is arranged between two consecutive arms 44 of the spring ring 42. The three lugs 52 deliberately give the spring ring 42 an outer diameter which exceeds the inner diameter of the peripheral bearing surface 48. By Therefore, to allow the mounting of the spring ring 42 on the support 2, there are provided in the peripheral surface 48 of the first notches 54, three in number, which open into the circular groove 50. Consequently, to mount the spring ring 42 on the support 2, it suffices to present it so that the three lugs 52 engage in the first three corresponding notches 54, then to rotate it in order to allow the lugs 52 to slide inside the groove circular 50, under the peripheral surface 48.

Les encoches 54 sont typiquement réalisées par une opération de matriçage de la portée périphérique 48 qui fait apparaître des portions en arc de cercle 55. A chacune des extrémités des portions en arc de cercle 55, la matière est localement repoussée au cours de l'opération de matriçage, ce qui forme des creux 57a sur le dessus de ces portions en arc de cercle 55, et des bossages 57b en dessous des portions en arc de cercle 55. Ces bossages 57b contribuent au maintien de l'anneau ressort 52 lorsque celui-ci est introduit dans la gorge circulaire 50, sous les portions en arc de cercle 55 de la portée périphérique 48.The notches 54 are typically produced by a forging operation of the peripheral bearing surface 48 which reveals the circular arc portions 55. At each of the ends of the circular arc portions 55, the material is locally pushed back during the operation. forging, which forms hollows 57a on top of these arcuate portions 55, and bosses 57b below the arcuate portions 55. These bosses 57b contribute to maintaining the spring ring 52 when the latter. ci is introduced into the circular groove 50, under the arcuate portions 55 of the peripheral bearing surface 48.

On notera que le montage de l'anneau ressort 42 survient après l'étape visant à placer le module pivot 18 dans son logement 16. Lorsque l'anneau ressort 42 est installé, le module pivot 18 exerce sur cet anneau ressort 42 une force qui tend à repousser cet anneau ressort 42. Sous l'effet de cette contrainte, l'anneau ressort 42 tend à se déformer élastiquement, mais n'est pas chassé de son logement 16 grâce à la présence des ergots 52 insérés dans la gorge circulaire 50 qui absorbent les contraintes mécaniques et s'opposent au déplacement de l'anneau ressort 42. En outre, comme les ergots 52 définissent des zones passives de l'anneau ressort 42, la présence de ces ergots 52 et les contraintes mécaniques qu'ils absorbent sont sans effet sur le comportement de l'anneau ressort 42. Par conséquent, le comportement de l'anneau ressort 42 n'est pas modifié lorsque celui-ci est monté sur le support 2.It will be noted that the mounting of the spring ring 42 occurs after the step aimed at placing the pivot module 18 in its housing 16. When the spring ring 42 is installed, the pivot module 18 exerts on this spring ring 42 a force which tends to push back this spring ring 42. Under the effect of this constraint, the spring ring 42 tends to deform elastically, but is not driven from its housing 16 thanks to the presence of the pins 52 inserted in the circular groove 50 which absorb the mechanical stresses and oppose the movement of the spring ring 42. In addition, as the lugs 52 define passive zones of the spring ring 42, the presence of these lugs 52 and the mechanical stresses that they absorb have no effect on the behavior of the spring ring 42. Consequently, the behavior of the spring ring 42 is not modified when the latter is mounted on the support 2.

Comme son nom l'indique, un dispositif amortisseur de chocs est destiné à permettre à un axe de micromécanique, par exemple logé dans un mouvement horloger, d'absorber sans casser l'énergie résultant d'un choc, notamment d'un choc latéral, en permettant à cet axe de se déplacer momentanément sous l'effet d'un choc avant de le ramener élastiquement dans sa position de repos. En fonction de l'intensité du choc et de la direction selon laquelle il s'applique, l'anneau ressort 42 est néanmoins susceptible de pivoter sur lui-même et il est tout à fait possible qu'il se retrouve dans une situation dans laquelle les trois ergots 52 se présentent dans les trois premières encoches 54 correspondantes. Dans une telle situation, l'anneau ressort 42 peut se découpler du support 2. L'axe 38 n'est alors plus maintenu par le dispositif amortisseur de chocs 1, ce qui entraîne inévitablement la panne du dispositif mécanique, par exemple horloger, dans lequel est installé ce dispositif amortisseur de chocs 1. Un tel risque est d'autant moins acceptable que, dans le domaine de l'horlogerie en particulier, les dispositifs amortisseurs de chocs sont majoritairement installés dans des montres qui appartiennent au segment supérieur du marché.As its name suggests, a shock-absorbing device is intended to allow a micromechanical axis, for example housed in a watch movement, to absorb without breaking the energy resulting from an impact, in particular from a side impact. , by allowing this axis to move momentarily under the effect of a shock before returning it elastically to its rest position. Depending on the intensity of the shock and the direction in which it is applied, the spring ring 42 is nevertheless capable of pivoting on itself and it is quite possible that it finds itself in a situation in which the three lugs 52 are in the first three corresponding notches 54. In such a situation, the spring ring 42 can be decoupled from the support 2. The axis 38 is then no longer held by the shock-absorbing device 1, which inevitably leads to the breakdown of the mechanical device, for example a watchmaker, in which is installed this shock-absorbing device 1. Such a risk is all the less acceptable as, in the field of watchmaking in particular, the shock-absorbing devices are mainly installed in watches which belong to the upper segment of the market.

Pour remédier à ce problème, il a déjà été proposé dans la demande de brevet EP 3220211 mentionnée ci-dessus de lamer la portée périphérique 48 dans les zones situées entre deux encoches 54 successives. Par lamage, on entend l'action de dresser la surface inférieure de la portée périphérique 48 en enlevant de la matière au moyen d'une lame tournante. Grâce à cette action de lamage, il est possible de réduire partiellement l'épaisseur d'un troisième rebord 56 de la portée périphérique 48 et de créer, entre deux encoches 54 successives, des dégagements 58 dans lesquels viennent se loger les ergots 52.To remedy this problem, it has already been proposed in the patent application EP 3220211 mentioned above to counter the peripheral bearing 48 in the areas between two successive notches 54. The term “countersinking” is understood to mean the action of raising the lower surface of the peripheral bearing surface 48 by removing material by means of a rotating blade. Thanks to this counterbore action, it is possible to partially reduce the thickness of a third flange 56 of the peripheral bearing surface 48 and to create, between two successive notches 54, clearances 58 in which the lugs 52 are housed.

La solution ci-dessus ne s'est pas révélée pleinement satisfaisante. Tout d'abord, les dégagements 58 dans lesquels sont logés les ergots 52 se sont révélés insuffisamment profonds et leurs rebords périphériques insuffisamment hauts pour pouvoir garantir une bonne immobilisation en pivotement angulaire de l'anneau ressort 42 en cas de chocs, notamment en cas de chocs latéraux. D'autre part, l'usinage des dégagements 58 au moyen d'une fraise, habituellement une fraise de type T, s'est avéré extrêmement long, fastidieux et avec des résultats aléatoires. Durant les opérations d'usinage, il fallait notamment veiller à ne pas mordre sur le diamètre intérieur de la portée périphérique 48. Les vitesses d'avance de la fraise T étaient faibles et des vibrations sont apparues dans l'outil de fraisage. Enfin, malgré tout le soin apporté aux opérations de fraisage, il n'était pas rare que des bavures subsistassent dans les dégagements 58.The above solution has not been found to be fully satisfactory. First of all, the clearances 58 in which the lugs 52 are housed have proved to be insufficiently deep and their peripheral edges insufficiently high to be able to guarantee good immobilization in angular pivoting of the spring ring 42 in the event of impacts, in particular in the event of side shocks. On the other hand, machining the undercuts 58 by means of a milling cutter, usually a T-type milling cutter, has proven to be extremely long, tedious and with random results. During machining operations, particular care had to be taken not to bite on the inside diameter of the peripheral seat 48. The feed speeds of the cutter T were low and vibrations appeared in the milling tool. Finally, despite all the care taken in the milling operations, it was not uncommon for burrs to remain in the clearances 58.

Résumé de l'inventionSummary of the invention

La présente invention a pour but de résoudre les problèmes mentionnés ci-dessus ainsi que d'autres encore en proposant un dispositif amortisseur de chocs dont les risques que ses différents composants se déboîtent en cas de choc axial ou latéral sont considérablement réduits, voire supprimés.The object of the present invention is to solve the above-mentioned problems as well as others still by proposing a shock-absorbing device in which the risks of its various components falling apart in the event of an axial or lateral impact are considerably reduced, or even eliminated.

A cet effet, la présente invention concerne un dispositif amortisseur de chocs pour un axe d'un mobile d'un dispositif micromécanique, en particulier un mouvement d'horlogerie, ce dispositif amortisseur de chocs comprenant un support qui comporte une coupelle dont une base est dépourvue de fond et qui est délimitée à sa périphérie par un rebord, le rebord comprenant une surface supérieure prolongée, d'un côté intérieur de la coupelle, par une paroi interne, et, d'un côté extérieur de la coupelle, par une paroi externe, le rebord de la coupelle définissant un logement dans lequel un module pivot est inséré, ce module pivot comprenant un chaton présentant un orifice central dans lequel est insérée une pierre percée qui correspond en forme et en dimensions à celles de l'orifice central, une pierre contre-pivot étant posée sur le chaton, au-dessus de la pierre percée, le dispositif amortisseur de chocs comprenant également un anneau ressort agencés entre le support et le module pivot pour exercer une contrainte élastique sur ce module pivot, le dispositif amortisseur de chocs étant muni d'un système à baïonnette pour le montage de l'anneau ressort entre le support et le module pivot, ce système à baïonnette comprenant une portée périphérique qui s'étend depuis la paroi interne du rebord vers l'intérieur du support, et sous laquelle est ménagée une gorge circulaire qui définit une zone de maintien, l'anneau ressort étant muni sur une périphérie extérieure d'au moins un ergot qui confère à cet anneau ressort un diamètre extérieur qui excède un diamètre intérieur de la portée périphérique, au moins une première encoche qui débouche dans la gorge circulaire étant prévue dans la portée périphérique, cette première encoche définissant un premier diamètre au moins égal au diamètre extérieur de l'anneau ressort, de sorte qu'il suffit de présenter l'anneau ressort de façon que l'ergot s'engage dans la première encoche correspondante, puis de faire pivoter l'anneau ressort afin de permettre à l'ergot de glisser à l'intérieur de la gorge circulaire, sous la portée périphérique, le dispositif amortisseur de chocs étant caractérisé en ce qu'au moins une seconde encoche est usinée dans la portée périphérique, cette seconde encoche définissant un second diamètre inférieur au diamètre extérieur de l'anneau ressort, de sorte que l'ergot vient s'encastrer dans cette seconde encoche, garantissant l'immobilisation angulaire en pivotement de l'anneau ressort.To this end, the present invention relates to a shock-absorbing device for an axis of a mobile of a micromechanical device, in particular a clockwork movement, this shock-absorbing device comprising a support which comprises a cup, one base of which is without a bottom and which is delimited at its periphery by a rim, the rim comprising an extended upper surface, on an inner side of the cup, by an internal wall, and, on an outer side of the cup, by a wall external, the rim of the cup defining a housing in which a pivot module is inserted, this pivot module comprising a kitten having a central orifice in which is inserted a pierced stone which corresponds in shape and dimensions to those of the central orifice, a counter-pivot stone being placed on the kitten, above the pierced stone, the shock-absorbing device also comprising a spring ring arranged between the support and the pivot module for exert an elastic stress on this pivot module, the shock-absorbing device being provided with a bayonet system for mounting the spring ring between the support and the pivot module, this bayonet system comprising a peripheral bearing surface which extends from the inner wall of the rim towards the inside of the support, and under which is formed a circular groove which defines a retaining zone, the spring ring being provided on an outer periphery with at least one lug which gives this spring ring an external diameter which exceeds an internal diameter of the peripheral surface, at least a first notch which opens into the circular groove being provided in the peripheral surface, this first notch defining a first diameter at least equal to the external diameter of the spring ring, so that it suffices to present the spring ring so that the lug engages in the first corresponding notch, then to rotate the spring ring in order to e allow the lug to slide inside the circular groove, under the peripheral surface, the shock absorbing device being characterized in that at least one second notch is machined in the peripheral surface, this second notch defining a second diameter less than the outer diameter of the spring ring, so that the lug fits into this second notch, ensuring the angular immobilization of the spring ring in pivoting.

Grâce à ces caractéristiques, la présente invention procure un dispositif amortisseur de chocs dans lequel des secondes encoches sont découpées dans le rebord de la portée périphérique. On s'écarte ainsi du profil circulaire du rebord de la portée périphérique, ce qui permet aux ergots de l'anneau ressort d'adopter une position de moindre contrainte sous la surface inférieure du rebord périphérique, et de venir buter contre les arêtes qui délimitent le profil de ces secondes encoches. L'anneau ressort est ainsi bloqué en pivotement angulaire, ce qui permet de garantir qu'en cas de choc, en particulier latéral, les risques que les axes de mobiles se déboîtent complètement sont limités, voire nuls. Un autre avantage de l'invention réside dans le fait que les encoches sont très faciles à usiner, par exemple par étampage ou découpage. Les temps de fabrication sont donc considérablement réduits et les taux de mise au rebut des pièces supports sont très faibles, toutes choses qui permettent de réduire sensiblement le prix de revient des dispositifs amortisseurs de chocs selon l'invention. Enfin, étant donné que les encoches sont très faciles à usiner dans la portée périphérique, on peut varier presque à l'infini le profil des secondes encoches, ce qui permet de rechercher le profil qui, pour une géométrie donnée des différents éléments du dispositif amortisseur de chocs, permet d'obtenir un blocage et une réponse optimaux de l'anneau ressort en cas de choc.Thanks to these characteristics, the present invention provides a shock absorbing device in which second notches are cut in the rim of the peripheral bearing surface. This moves away from the circular profile of the rim of the peripheral bearing surface, which allows the lugs of the spring ring to adopt a position of least constraint under the lower surface of the peripheral rim, and to abut against the ridges which delimit the profile of these second notches. The spring ring is thus locked in angular pivoting, which makes it possible to guarantee that in the event of an impact, in particular lateral, the risks that the axes of the moving parts disengage completely are limited, or even zero. Another advantage of the invention lies in the fact that the notches are very easy to machine, for example by stamping or cutting. Manufacturing times are therefore considerably reduced and the rates of scrapping of the support parts are very low, all of which makes it possible to significantly reduce the cost price of the shock-absorbing devices according to the invention. Finally, given that the notches are very easy to machine in the peripheral seat, the profile of the second notches can be varied almost infinitely, which makes it possible to search for the profile which, for a given geometry of the various elements of the damping device shock, provides optimal locking and response of the spring ring in the event of an impact.

Brève description des figuresBrief description of the figures

D'autres caractéristiques et avantages de la présente invention ressortiront plus clairement de la description détaillée qui suit d'un mode de réalisation d'un dispositif amortisseur de chocs selon l'invention, cet exemple étant donné à titre purement illustratif et non limitatif seulement en liaison avec le dessin annexé sur lequel :

  • les figures 1 et 2, déjà citées, illustrent de manière schématique un dispositif amortisseur de chocs connu dans lequel des évidements sont usinés dans la surface inférieure de la portée périphérique du support, afin de tenter de bloquer l'anneau ressort en pivotement angulaire en cas de choc ;
  • les figures 3A et 3B sont des vues respectivement de dessus et en perspective d'un dispositif amortisseur de chocs selon une première forme d'exécution de l'invention ;
  • les figures 4A et 4B sont des vues respectivement de dessus et en perspective d'un dispositif amortisseur de chocs selon une deuxième forme d'exécution de l'invention ;
  • les figures 5A et 5B sont des vues respectivement de dessus et en perspective d'un dispositif amortisseur de chocs selon une troisième forme d'exécution de l'invention ;
  • la figure 6A est une vue de détail à grande échelle de la région du support selon l'art antérieur dans laquelle la portée périphérique est munie de dégagements qui reçoivent les ergots de l'anneau ressort, et
  • la figure 6B est une vue de détail à grande échelle de la région du support selon l'invention dans laquelle la portée périphérique est munie d'encoches qui reçoivent les ergots de l'anneau ressort.
Other characteristics and advantages of the present invention will emerge more clearly from the following detailed description of an embodiment of a shock-absorbing device according to the invention, this example given for purely illustrative and non-limiting only in conjunction with the appended drawing in which:
  • the figures 1 and 2 , already cited, schematically illustrate a known shock-absorbing device in which recesses are machined in the lower surface of the peripheral bearing surface of the support, in order to attempt to block the spring ring in angular pivoting in the event of an impact;
  • the figures 3A and 3B are views respectively from above and in perspective of a shock-absorbing device according to a first embodiment of the invention;
  • the figures 4A and 4B are views respectively from above and in perspective of a shock-absorbing device according to a second embodiment of the invention;
  • the figures 5A and 5B are views respectively from above and in perspective of a shock-absorbing device according to a third embodiment of the invention;
  • the figure 6A is a detailed view on a large scale of the region of the support according to the prior art in which the peripheral bearing surface is provided with recesses which receive the lugs of the spring ring, and
  • the figure 6B is a detailed view on a large scale of the region of the support according to the invention in which the peripheral bearing surface is provided with notches which receive the lugs of the spring ring.

Description détaillée d'un mode de réalisation de l'inventionDetailed description of an embodiment of the invention

La présente invention procède de l'idée générale inventive qui consiste à découper dans le rebord de la portée périphérique du support d'un dispositif amortisseur de choc des encoches destinées à recevoir les ergots de blocage d'un anneau ressort destiné à contraindre la pierre contre-pivot en direction de la pierre percée qui guide le tigeron d'un axe de mobile. Ces encoches, par exemple réalisées par étampage ou découpage, sont plus aisées à usiner, de sorte que le prix de revient des supports résultants est moindre que par le passé. Par ailleurs, étant donné que les encoches sont découpées dans l'épaisseur complète du rebord, le blocage des ergots contre les arêtes qui délimitent le contour de ces encoches est optimal. Enfin, en raison de la facilité avec laquelle ces encoches peuvent être réalisées, on jouit d'une grande liberté en ce qui concerne la forme que l'on peut donner à ces encoches, ce qui, pour chaque géométrie d'anneau ressort, permet de rechercher la forme des encoches garantissant le meilleur blocage de cet anneau ressort.The present invention proceeds from the general inventive idea which consists in cutting in the edge of the peripheral bearing surface of the support of a shock-absorbing device notches intended to receive the locking pins of a spring ring intended to force the stone. counter-pivot in the direction of the pierced stone which guides the tigeron of a mobile axis. These notches, for example produced by stamping or cutting, are easier to machine, so that the cost price of the resulting supports is lower than in the past. Furthermore, given that the notches are cut from the full thickness of the rim, the locking of the lugs against the ridges which define the contour of these notches is optimal. Finally, because of the ease with which these notches can be produced, great freedom is enjoyed with regard to the shape that can be given to these notches, which, for each spring ring geometry, allows to find the shape of the notches guaranteeing the best locking of this spring ring.

Le dispositif amortisseur de chocs selon l'invention est en tout point identique au dispositif amortisseur de chocs de l'art antérieur décrit ci-dessus, à la différence notable près que le rebord de la portée périphérique du support est partiellement découpé selon des encoches qui permettent le blocage des ergots de l'anneau ressort, et donc le verrouillage en pivotement angulaire de ce dernier. On comprendra donc que, dans ce qui suit, les éléments identiques à ceux décrits en liaison avec les figures 1 et 2 seront désignés par les mêmes références numériques.The shock-absorbing device according to the invention is in all respects identical to the shock-absorbing device of the prior art described above, with the notable difference that the edge of the peripheral bearing surface of the support is partially cut out according to notches which allow the locking of the lugs of the spring ring, and therefore the angular pivoting locking of the latter. It will therefore be understood that, in what follows, the elements identical to those described in connection with the figures 1 and 2 will be designated by the same reference numerals.

Les figures 3A et 3B illustrent, respectivement en vue de dessus et en perspective, une première forme d'exécution d'un dispositif amortisseur de chocs selon l'invention. Désigné dans son ensemble par la référence numérique générale 60, ce dispositif amortisseur de chocs comprend notamment un anneau ressort 42 de type plat muni d'au moins un et, dans l'exemple représenté, de trois bras 44 régulièrement espacés qui s'étendent radialement vers le centre C de cet anneau ressort 42. Ces trois bras 44 permettent à l'anneau ressort 42 de plaquer le module pivot 18 dans le logement 16 du support 2.The figures 3A and 3B illustrate, respectively in top view and in perspective, a first embodiment of a shock absorbing device according to the invention. Designated as a whole by the general reference numeral 60, this shock-absorbing device comprises in particular a spring ring 42 of the flat type provided with at least one and, in the example shown, three arms 44 which are regularly spaced apart which extend radially. towards the center C of this spring ring 42. These three arms 44 allow the spring ring 42 to press the pivot module 18 into the housing 16 of the support 2.

Pour le montage de l'anneau ressort 42 sur le support 2, on utilise un système à baïonnette 46 qui comprend une portée périphérique 48 s'étendant depuis le premier rebord 8 du support 2 vers le centre de ce support 2. Par ailleurs, une gorge circulaire 50 est ménagée dans la paroi interne 12 du premier rebord 8, sous la portée périphérique 48, pour définir une zone de maintien.For mounting the spring ring 42 on the support 2, a bayonet system 46 is used which comprises a peripheral bearing surface 48 extending from the first flange 8 of the support 2 towards the center of this support 2. Furthermore, a circular groove 50 is formed in the internal wall 12 of the first flange 8, under the peripheral bearing surface 48, to define a holding zone .

Pour coopérer avec le système à baïonnette 46, l'anneau ressort 42 est muni sur sa périphérie extérieure d'au moins un et, dans l'exemple représenté, de trois ergots 52 régulièrement espacés qui s'étendent radialement à l'opposé du centre Ç de cet anneau ressort 42. Comme on peut le voir au dessin, ces trois ergots 52 sont disposés de manière angulairement décalée par rapport aux trois bras 44 de l'anneau ressort 42, de préférence à égale distance angulaire de deux bras 44 consécutifs.To cooperate with the bayonet system 46, the spring ring 42 is provided on its outer periphery with at least one and, in the example shown, three regularly spaced lugs 52 which extend radially away from the center. Ç of this spring ring 42. As can be seen in the drawing, these three lugs 52 are arranged angularly offset with respect to the three arms 44 of the spring ring 42, preferably at an equal angular distance from two consecutive arms 44.

Volontairement, les trois ergots 52 confèrent à l'anneau ressort 42 un diamètre extérieur qui excède le diamètre intérieur D de la portée périphérique 48. Par conséquent, pour permettre le montage de l'anneau ressort 42 sur le support 2, il est prévu dans la portée périphérique 48 des premières encoches 54 au nombre de trois qui débouchent dans la gorge circulaire 50. Ces trois premières encoches 54 sont disposées avec le même espacement angulaire que les ergots 52. Par suite, pour monter l'anneau ressort 42 sur le support 2, il suffit de le présenter de sorte que les trois ergots 52 se retrouvent en regard des trois premières encoches 54 correspondantes, puis de le faire pivoter afin de permettre aux ergots 52 de glisser à l'intérieur de la gorge circulaire 50, sous la portée périphérique 48.Voluntarily, the three lugs 52 give the spring ring 42 an outer diameter which exceeds the inner diameter D of the peripheral bearing surface 48. Consequently, to allow the spring ring 42 to be mounted on the support 2, it is provided in the peripheral bearing surface 48 of the first notches 54, three in number, which open into the circular groove 50. These first three notches 54 are arranged with the same angular spacing as the lugs 52. Consequently, to mount the spring ring 42 on the support 2, it suffices to present it so that the three lugs 52 are found opposite the first three corresponding notches 54, then to rotate it in order to allow the lugs 52 to slide inside the circular groove 50, under the peripheral range 48.

Les encoches 54 sont typiquement réalisées par une opération de matriçage de la portée périphérique 48 qui fait apparaître des portions en arc de cercle 55. A chacune des extrémités des portions en arc de cercle 55, la matière est localement repoussée au cours de l'opération de matriçage, ce qui forme des creux 57a sur le dessus de ces portions en arc de cercle 55, et des bossages 57b en dessous des portions en arc de cercle 55. Ces bossages 57b contribuent au maintien de l'anneau ressort 52 lorsque celui-ci est introduit dans la gorge circulaire 50, sous les portions en arc de cercle 55 de la portée périphérique 48.The notches 54 are typically produced by a forging operation of the peripheral bearing surface 48 which reveals the circular arc portions 55. At each of the ends of the circular arc portions 55, the material is locally pushed back during the operation. forging, which forms hollows 57a on top of these arcuate portions 55, and bosses 57b below the arcuate portions 55. These bosses 57b contribute to the retention of the spring ring 52 when the latter is introduced into the circular groove 50, under the arcuate portions 55 of the peripheral bearing surface 48.

On notera que le montage de l'anneau ressort 42 survient après l'étape visant à placer le module pivot 18 dans son logement 16. Lorsque l'anneau ressort 42 est installé, le module pivot 18 exerce sur cet anneau ressort 42 une force qui tend à repousser cet anneau ressort 42. Sous l'effet de cette contrainte, l'anneau ressort 42 tend à se déformer élastiquement, mais n'est pas chassé de son logement 16 grâce à la présence des ergots 52 insérés dans la gorge circulaire 50 qui absorbent les contraintes mécaniques et s'opposent au déplacement de l'anneau ressort 42. En outre, comme les ergots 52 définissent des zones passives de l'anneau ressort 42, la présence de ces ergots 52 et les contraintes mécaniques qu'ils absorbent sont sans effet sur le comportement de l'anneau ressort 42. Par conséquent, le comportement de l'anneau ressort 42 n'est pas modifié lorsque celui-ci est monté sur le support 2.It will be noted that the mounting of the spring ring 42 occurs after the step aimed at placing the pivot module 18 in its housing 16. When the spring ring 42 is installed, the pivot module 18 exerts on this spring ring 42 a force which tends to push back this spring ring 42. Under the effect of this constraint, the spring ring 42 tends to deform elastically, but is not driven from its housing 16 thanks to the presence of the pins 52 inserted in the circular groove 50 which absorb the mechanical stresses and oppose the movement of the spring ring 42. In addition, as the lugs 52 define passive zones of the spring ring 42, the presence of these lugs 52 and the mechanical stresses that they absorb have no effect on the behavior of the spring ring 42. Consequently, the behavior of the spring ring 42 is not modified when the latter is mounted on the support 2.

Afin de garantir l'immobilisation en pivotement angulaire de l'anneau ressort 42 et ainsi s'assurer que le dispositif amortisseur de chocs 60 ne risque pas de se déboîter en cas de choc, des secondes encoches 62 au nombre de trois sont usinées, par exemple par découpage ou étampage, dans le troisième rebord 56 de la portée périphérique 48 du support 2. Ainsi, une fois l'anneau ressort 42 engagé dans la gorge circulaire 50 du système à baïonnette 46, il suffit de faire pivoter l'anneau ressort 42 jusqu'à tant que les ergots 52 viennent s'encastrer dans les secondes encoches 62 en butant contre les arêtes 64 qui délimitent le profil de ces secondes encoches 62.In order to guarantee the immobilization in angular pivoting of the spring ring 42 and thus to ensure that the shock-absorbing device 60 does not risk dislodging in the event of an impact, second notches 62, three in number, are machined, for example for example by cutting or stamping, in the third flange 56 of the peripheral bearing surface 48 of the support 2. Thus, once the spring ring 42 engaged in the circular groove 50 of the bayonet system 46, it suffices to rotate the spring ring 42 until the lugs 52 fit into the second notches 62, butting against the ridges 64 which delimit the profile of these second notches 62.

En examinant les figures 6A et 6B, on constate que, dans le cas du dispositif amortisseur de chocs 1 de l'art antérieur (figure 6A), on ne fait que réduire par le dessous l'épaisseur du troisième rebord 56 de la portée périphérique 48, sans altérer le périmètre de ce rebord 56, pour créer les dégagements 58. Or, on comprend aisément qu'une telle opération d'usinage est longue et délicate à réaliser. En outre, les dégagements 58 se sont révélés insuffisamment profonds et leurs rebords périphériques insuffisamment hauts pour pouvoir garantir une bonne immobilisation en pivotement angulaire de l'anneau ressort 42 en cas de chocs. Au contraire, dans le cas du dispositif amortisseur de chocs 60 selon l'invention (figure 6B), les secondes encoches 62 sont découpées dans le troisième rebord 56 de la portée périphérique 48 du support 2, sur toute l'épaisseur de ce troisième rebord 56 et en mordant sur le périmètre de ce troisième rebord 56. Ainsi, ces secondes encoches 62 sont suffisamment profondes et leurs arêtes 64 suffisamment hautes pour garantir le bon blocage des ergots 52 et l'immobilisation de l'anneau ressort 42 en pivotement angulaire en cas de choc.By examining the figures 6A and 6B , it can be seen that, in the case of the shock-absorbing device 1 of the prior art ( figure 6A ), we only reduce the thickness of the third rim 56 of the peripheral bearing surface 48 from below, without altering the perimeter of this rim 56, to create the clearances 58. However, it is easily understood that such an operation machining is long and difficult to achieve. In addition, the recesses 58 have proved insufficiently deep and their peripheral edges insufficiently high to be able to guarantee good immobilization in angular pivoting of the spring ring 42 in the event of impacts. On the contrary, in the case of the shock absorbing device 60 according to the invention ( figure 6B ), the second notches 62 are cut in the third rim 56 of the peripheral bearing surface 48 of the support 2, over the entire thickness of this third rim 56 and biting on the perimeter of this third rim 56. Thus, these second notches 62 are sufficiently deep and their ridges 64 sufficiently high to ensure the proper locking of the lugs 52 and the immobilization of the spring ring 42 in angular pivoting in the event of an impact.

En outre, ces secondes encoches 62 sont très aisées à usiner et on peut donc adapter au mieux leur profil afin de garantir un blocage optimal. Ainsi, aux figures 3A et 3B, on a mordu sur le périmètre 56 de la portée périphérique 48 pour réaliser des encoches 62 qui s'étendent selon des arcs de cercle qui sont concentriques avec le centre Ç de l'anneau ressort 42. Aux figures 4A et 4B, les secondes encoches 62 ont été obtenues en découpant la portée périphérique 48 selon un cercle de petit rayon dont le centre C1 se trouve sur la bissectrice de l'angle α qui s'étend entre deux premières encoches 54 successives. De même, aux figures 5A et 5B, les secondes encoches 62 ont été obtenues en découpant la portée périphérique selon un cercle de rayon plus grand dont le centre C2 se trouve lui aussi sur la bissectrice de l'angle qui s'étend entre deux premières encoches 54 successives.In addition, these second notches 62 are very easy to machine and their profile can therefore be adapted as best as possible in order to guarantee optimum locking. Thus, to figures 3A and 3B , we bitten on the perimeter 56 of the peripheral surface 48 to make notches 62 which extend in arcs of a circle which are concentric with the center Ç of the spring ring 42. Auxiliary figures 4A and 4B , the second notches 62 have been obtained by cutting the peripheral bearing surface 48 according to a circle of small radius whose center C1 is on the bisector of the angle α which extends between two first successive notches 54. Likewise, at figures 5A and 5B , the second notches 62 were obtained by cutting the peripheral bearing area along a circle of greater radius whose center C2 is also located on the bisector of the angle which extends between two first successive notches 54.

Il va de soi que la présente invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits, et que diverses modifications et variantes simples peuvent être envisagées par l'homme du métier sans sortir du cadre de l'invention tel que défini par les revendications annexées.It goes without saying that the present invention is not limited to the embodiments which have just been described, and that various modifications and simple variants can be envisaged by those skilled in the art without departing from the scope of the invention such as defined by the appended claims.

NomenclatureNomenclature

1.1.
Dispositif amortisseur de chocs ou système antichocShock absorbing device or shock absorbing system
2.2.
SupportSupport
4.4.
CoupelleCup
6.6.
BaseBased
8.8.
Premier rebordFirst ledge
10.10.
Surface supérieureTop surface
12.12.
Paroi interneInternal wall
14.14.
Paroi externeExternal wall
16.16.
LogementHousing
18.18.
Module pivotPivot module
20.20.
ChatonKitten
22.22.
Orifice central circulaireCircular central port
24.24.
Deuxième rebordSecond ledge
26.26.
Paroi latérale externeExternal side wall
28.28.
Paroi latérale interneInternal side wall
30.30.
Pierre percéePierced stone
32.32.
EpaulementShoulder
34.34.
Pierre contre-pivotCounter-pivot stone
36.36.
TigeronTigeron
38.38.
AxeAxis
40.40.
Moyens élastiquesElastic means
42.42.
Anneau ressortSpring ring
C. C.
Centre de l'anneau ressortCenter of spring ring
44.44.
BrasArms
46.46.
Système à baïonnetteBayonet system
48.48.
Portée périphériquePeripheral range
50.50.
Gorge circulaireCircular groove
52.52.
ErgotsDewclaws
54.54.
Premières encochesFirst notches
55.55.
Portions en arc de cerclePortions in an arc
56.56.
Troisième rebordThird ledge
57a.57a.
CreuxHollow
57b.57b.
BossagesBosses
58.58.
DégagementsClearances
60.60.
Dispositif amortisseur de chocsShock absorber device
62.62.
Secondes encochesSecond notches
64.64.
ArêtesEdges

Claims (1)

  1. Shock-absorber device (1) for a wheel arbor (38) of a micromechanical device, particularly a timepiece movement, this shock-absorber device (1) comprising a support (2) which includes a turning-arbor (4) a base (6) thereof being devoid of a bottom and which is delimited at the periphery thereof by a rim (8), the rim (8) comprising a top surface (10) extended, on the inside of the turning-arbor (4), by an inner wall (12), and, on the outside of the turning-arbor (4), by an outer wall (14), the rim (8) of the turning-arbor (4) defining a housing (16) wherein a pivot module (18) is inserted, this pivot module (18) comprising a setting (20) having a central orifice (22) wherein is inserted a bored stone (30) which corresponds in shape and in size to those of the central orifice (22), an endstone (34) being placed on the setting (20), on top of the bored stone (30), the shock-absorber device (1) also comprising a spring ring (42) arranged between the support (2) and the pivot module (18) to exert elastic strain on this pivot module (18), the shock-absorber device (1) being equipped with a bayonet system (46) for mounting the spring ring (42) between the support (2) and the pivot module (18), this bayonet system (46) comprising a peripheral shoulder (48) which extends from the inner wall (12) of the rim (8) towards the inside of the support (2), and under which is formed a circular groove (50) which defines a holding area, the spring ring (42) being equipped on an outer periphery with at least one catch (52) which gives this spring ring (42) an outer diameter which exceeds the inner diameter of the peripheral shoulder (48), at least one first notch (54) which leads to the circular groove (50) being provided in the peripheral shoulder (48), this first notch defining a first diameter at least equal to the outer diameter of the spring ring (42), such that it is simply necessary to present the spring ring (42) in such a way that the catch (52) is engaged in the corresponding first notch (54), and then pivoting the spring ring (42) so as to enable the catch (52) to slide inside the circular groove (50), under the peripheral shoulder (48), the shock-absorber device (1) being characterised in that at least one second notch (62) is machined in the peripheral shoulder (48), this second notch (62) defining a second diameter less than the outer diameter of the spring ring (42), such that the catch (52) is interlocked in this second notch, ensuring the angular pivot locking of the spring ring (42).
EP17195675.8A 2017-10-10 2017-10-10 Shock absorbing system with angular locking Active EP3470934B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17195675.8A EP3470934B1 (en) 2017-10-10 2017-10-10 Shock absorbing system with angular locking
JP2018179007A JP6557390B2 (en) 2017-10-10 2018-09-25 Angular locking shock resistant system
CN201811172481.9A CN109656120B (en) 2017-10-10 2018-10-09 Angular locking anti-vibration system
US16/156,115 US11169487B2 (en) 2017-10-10 2018-10-10 Angular locking shockproof system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17195675.8A EP3470934B1 (en) 2017-10-10 2017-10-10 Shock absorbing system with angular locking

Publications (2)

Publication Number Publication Date
EP3470934A1 EP3470934A1 (en) 2019-04-17
EP3470934B1 true EP3470934B1 (en) 2020-08-19

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EP17195675.8A Active EP3470934B1 (en) 2017-10-10 2017-10-10 Shock absorbing system with angular locking

Country Status (4)

Country Link
US (1) US11169487B2 (en)
EP (1) EP3470934B1 (en)
JP (1) JP6557390B2 (en)
CN (1) CN109656120B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3839661B1 (en) * 2019-12-18 2022-08-10 ETA SA Manufacture Horlogère Suisse Shock absorber device with angular locking
EP3910427A1 (en) 2020-05-13 2021-11-17 ETA SA Manufacture Horlogère Suisse Attachment kit

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CH201334A (en) * 1937-11-08 1938-11-30 Fritz Marti Resilient bearing fixing device.
CH296730A (en) * 1950-10-19 1954-02-28 Parechoc Sa Device for mounting a clockwork axis counter-pivot on its support.
US2973618A (en) * 1958-01-11 1961-03-07 Morf Pierre Shock-absorbing pivot bearing
CH1394061A4 (en) * 1961-11-29 1963-09-30
CH559384A (en) * 1971-07-15 1975-02-28
JPH09113637A (en) * 1995-10-16 1997-05-02 Orient Watch Co Ltd Hand-wound spiral spring structure for portable mechanical watch
DE602005025585D1 (en) * 2005-02-23 2011-02-10 Eta Sa Mft Horlogere Suisse Shock absorbing watch storage
JP5455115B2 (en) * 2009-10-07 2014-03-26 セイコーインスツル株式会社 Watch bearings, movements and portable watches
CH708090B1 (en) * 2013-05-24 2017-06-15 Swatch Group Res & Dev Ltd Bayonet shock absorber device.
CN203930351U (en) * 2013-12-20 2014-11-05 Eta瑞士钟表制造股份有限公司 Damping bearing, comprise the movement of this damping bearing and comprise the clock and watch of this movement
CH709186A2 (en) * 2014-01-31 2015-07-31 Eta Sa Manufacture Horlogère Suisse A display as the date for a timepiece.
JP6710041B2 (en) * 2014-11-27 2020-06-17 ロレックス・ソシエテ・アノニムＲｏｌｅｘ Ｓａ Balancing spring fixing system
CN106557010A (en) * 2015-09-29 2017-04-05 福州珂麦表业有限公司 The shockproof balance spring mechanism of stem-winder
EP3220211B1 (en) * 2016-03-14 2018-10-10 ETA SA Manufacture Horlogère Suisse Shock absorbing system with angular locking

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Also Published As

Publication number Publication date
US11169487B2 (en) 2021-11-09
CN109656120A (en) 2019-04-19
CN109656120B (en) 2020-12-11
JP2019070643A (en) 2019-05-09
JP6557390B2 (en) 2019-08-07
US20190107810A1 (en) 2019-04-11
EP3470934A1 (en) 2019-04-17

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