EP2605086A1 - Stoßsicheres System mit Membran für Uhren - Google Patents

Stoßsicheres System mit Membran für Uhren Download PDF

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Publication number
EP2605086A1
EP2605086A1 EP11193835.3A EP11193835A EP2605086A1 EP 2605086 A1 EP2605086 A1 EP 2605086A1 EP 11193835 A EP11193835 A EP 11193835A EP 2605086 A1 EP2605086 A1 EP 2605086A1
Authority
EP
European Patent Office
Prior art keywords
pivot
bearing according
elastic means
damper bearing
lower face
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.)
Withdrawn
Application number
EP11193835.3A
Other languages
English (en)
French (fr)
Inventor
Julien Moulin
Jean-Luc Helfer
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 SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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.)
Filing date
Publication date
Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP11193835.3A priority Critical patent/EP2605086A1/de
Priority to PCT/EP2012/005139 priority patent/WO2013087202A1/fr
Priority to EP12808257.5A priority patent/EP2791741B1/de
Publication of EP2605086A1 publication Critical patent/EP2605086A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/06—Manufacture or mounting processes

Definitions

  • the present invention relates to an anti-shock system for a mobile axis of a timepiece.
  • the axis comprises a tigeron, comprising a support.
  • the support is provided with a housing adapted to receive a pivot system in which the tigeron is inserted.
  • the shockproof system further comprises elastic means arranged to exert on said pivot system at least one axial force
  • the technical field of the invention is the field of fine mechanics.
  • the present invention relates to bearings for timepieces, more particularly of the type for damping shocks.
  • the mechanical watch manufacturers have long since designed numerous devices allowing an axis to absorb the energy resulting from an impact, in particular a side impact, by abutment against a wall of the hole of the base block that it crosses. while allowing a momentary movement of the tigeron before it is brought back to its rest position under the action of a spring.
  • the figure 1 illustrates an inverted double-cone device that is currently used in timepieces on the market.
  • the kitten 20 is held in a housing 6 of the support 1 by a spring 10 which comprises in this example of the radial extensions 9 compressing the pivoting stone 5.
  • the housing 6 comprises two bearing surfaces 7, 7a in the form of inverted cones on which bear complementary bearing surfaces 8, 8a of the kitten 20, said litters to be executed with a very large precision.
  • the spring 10 acts alone to bring the balance shaft 3 back to its initial position.
  • the spring 10 is dimensioned to have a limit of displacement so that beyond this limit, the balance shaft 3 comes into contact with abutments 14 allowing said axis 3 to absorb the shock, which the tigers 3a of Axis 3 can not do without breaking.
  • the spring 10 cooperates with the complementary inclined planes 7, 7a; 8, 8a to refocus the kitten 20.
  • Such bearings have for example been sold under the trademark Incabloc®.
  • These springs can be made of phynox, CuBe or brass and are manufactured by traditional cutting means.
  • anti-shock systems comprising a support whose base has a hole for the passage of the balance shaft terminated by a tigeron, allows to position a kitten in which are immobilized a pierced stone traversed by the tigeron and a pivoting stone 5.
  • the kitten is held in a housing of the support by a spring with arm so as to be suspended
  • the object of the invention is to overcome the drawbacks of the prior art by proposing to provide a shockproof watch system that is more efficient and more shock-resistant and simpler and less expensive to produce.
  • the invention relates to a shock absorbing bearing for an axis of a mobile of a timepiece, said axis comprising a tigeron, said bearing comprising a support provided with a housing provided for receiving a pivot system.
  • a pivot module in which the tigeron is inserted and elastic means arranged to allow said pivot module to be suspended mounted and to exert on said pivot module at least one axial force, characterized in that the elastic means comprise a diaphragm spring .
  • a first advantage of the present invention is to obtain a pivot system whose replacement is perfect. Indeed, as the diaphragm spring is suspended, there is no contact or friction between said diaphragm spring and the support and thus nothing disturbs the refocusing.
  • Another advantage of the present invention is that a diaphragm spring has less complex shapes than an arm spring thus simplifying manufacture.
  • the anti-shock system further comprises fastening means for fixing said pivot assembly to the support.
  • the elastic means and the pivot module are in one piece so that the elastic means comprise a disc comprising a lower face and an upper face, the disc comprising at least on its lower face or its upper face a thickened central portion, the central portion of the lower face comprising a recess in which the tigeron is inserted.
  • the elastic means comprise a disc comprising a lower face and an upper face, the disc comprising at least on its lower face or its upper face a central portion in extra thickness, the central portion of the lower face comprising a recess in which the pivot module is placed.
  • the elastic means comprise a disc comprising a lower face and an upper face, the disc having a central opening in which is fixed the pivot module, the pivot module comprising a kitten supporting a pierced stone and a stone against pivot.
  • the disk comprising, on the periphery of its upper face, a flange extending in a direction tending to move away from said upper face and ending with an end.
  • the attachment means comprise female attachment means arranged on the support and male attachment means arranged at the end of the rim of the disc, said male and female attachment means being arranged to cooperate together.
  • the attachment means is a weld connecting the rim of the disk to the support.
  • the diaphragm spring comprises recesses or openings.
  • the elastic means are made of metal or metal alloy.
  • the elastic means are made of an at least partially amorphous metal alloy.
  • the elastic means are made of polymers.
  • the elastic means are made of filled polymers.
  • the elastic means are made of polycrystalline ceramic.
  • the elastic means are made of monocrystalline ceramic.
  • the present invention proceeds from the general inventive idea of providing a shock absorbing system 100 having greater reliability by avoiding contact.
  • the present invention can take different forms.
  • the figure 2 illustrates a shockproof system 100 which comprises a support 101 of the form of a disk having a circular vertical wall 101a delimiting a housing 102 whose center is pierced with a hole 103.
  • This hole 103 allows the passage of an axis of pendulum finished by a tigeron.
  • the support 101 may be either an independent part driven or fixed by any means in the frame of the watch movement, or be integrated in a part of the movement, such as a bridge or a plate.
  • a pivot system 105 In the housing 102 of the support 101 is arranged a pivot system 105 whose purpose is to damp, at least in part, the shocks undergone by the balance shaft.
  • the pivot system 105 comprises elastic means 107, a pivot module 109 and attachment means 111 for fixing said pivot system 105 to the support 101.
  • the elastic means 107 are in the form of a membrane.
  • This membrane being made of a first material.
  • these elastic means 107 are in the form of a base 200 in the form of a disk comprising a lower face 203 and an upper face 201 and having a central orifice 205, the lower face 203 facing the bottom of the support 101 that is to say the hole 103 in which the balance shaft terminated by a tigeron passes.
  • the pivot module 109 In the center of this disk 200 is fixed the pivot module 109.
  • This disk 200 comprises, at its periphery, a peripheral rim 207 extending in an axial direction that is to say in a direction tending away from the upper face 201.
  • this rim 207 extends so that the surface of the horizontal plane to the disk 200 increases as the height of the rim 207 increases.
  • the elastic means 107 are shown mounted to the support 101 at the figure 4 .
  • the attachment means 111 are arranged to fix the membrane 107 with the pivot module 109 attached thereto.
  • These attachment means 111 may be a crimping ring.
  • the attachment means 111 are integral with the elastic means 107, that is to say with the membrane.
  • These attachment means 111 then comprise female attachment means 111b and male attachment means 111a.
  • the male fastening means 111a comprise, at the end 209 of the peripheral rim 207, two peripheral peripheral 211 protrusions parallel to each other. This arrangement allows the presence of a groove 213 between these two projections 211.
  • the support 101 then comprises, at its vertical circular wall 101 a, the female attachment means 111 b in the form of a rim of holding 101b extending along the wall 101a as visible at the figure 4 .
  • This holding flange 101a and the groove 213 located between the two circular projections 211 of the flange 207 of the elastic means 107 are arranged to cooperate together so that said holding flange 101b engages said groove 213.
  • This configuration allows the membrane spring to be easily attached to said support 101.
  • These attachment means 111 can be fixed or mounted with glue or solder or be mounted by force or screwing.
  • the elastic means 107 that is to say the diaphragm spring and the pivot module are monobloc.
  • the disk-shaped base 300 comprises at its upper face 301 and / or its lower face 303, an extra thickness 315 that can have a trapezoidal profile. This extra thickness 315 is placed preferentially in the center of the Disk 300.
  • the disk 300 comprises on its underside 303 a recess 317 in which the shank of the balance shaft can be inserted. This recess 317 may have a conical bottom.
  • the figure 4 shows the example in which the disc 300 comprises in the center of the upper face 301 and the lower face 303, an extra thickness 315 can have a trapezoidal profile.
  • the Figures 5 and 6 show respectively the example in which the disc 300 comprises an excess thickness 315 which can have a trapezoidal profile at the lower face 303, and the example in which the disc 300 comprises an extra thickness 315 can have a trapezoidal profile at the face greater than 301.
  • This embodiment is to have a pivot system 105 made in one piece to have a simpler manufacturing process, faster since one piece must be manufactured.
  • this embodiment makes it possible to have a method of mounting the anti-shock system which is clearly simplified since only the step of fixing the pivot system 105 to the support 101 is necessary. The intermediate stages of assembly of the different parts between them no longer exist.
  • the diaphragm spring 107 and the pivot module 109 are not monoblock but the pivot module 109 is connected or fixed to the elastic means 107.
  • the disc 400 of the diaphragm spring 107 comprises an extra thickness 413 on its upper face 401 and / or on its underside 403 at their central portion 300a.
  • the lower face 403 then comprises a pivot housing 417.
  • This pivot housing 317 is arranged to receive the pivot module 109 which is preferably in the form of a part 419 such a pellet.
  • This pellet 419 is inserted in the pivot housing 417 and comprises the recess 420 in which the shank of the balance shaft can be inserted.
  • the first material that is to say the material that constitutes the spring to Membrane 107 has good mechanical properties for spring applications but does not have springs for pivot applications. Spring applications require good elastic deformation capability whereas pivot applications require good wear and friction resistance characteristics.
  • This configuration having a dissociation of the spring and pivot functions thus makes it possible to use the most effective materials for each function while keeping a simplicity since said pivot system comprises only two elements: the membrane spring 107 and the pellet 420 serving as pivot.
  • the examples of realization of the Figures 4 to 6 of the first embodiment are also possible for this second embodiment so that the extra thickness 413 can be located on one or the other of the lower faces 403 or 401.
  • the elastic means 107 and the pivot module 109 are not monoblocks.
  • the pivot module 109 comprises a kitten 500 in which are arranged a pierced stone 501 and a pivoting stone 503.
  • This kitten 500 is therefore in the form of an annular piece comprising two stones: a pierced stone 501 and a stone against pivot 503 placed respectively one below the other. The whole is then fixed in the central orifice 205 of the disc 200 of the elastic means 107 visible to the figure 3 .
  • shock absorbing system 100 is distinguished by the use of elastic means 107 in the form of a diaphragm spring suspended, it is also distinguished by the materials used when the springs type lyre used in anti-shock systems according to the prior art mainly use brass, phynox or CuBe.
  • the elastic means 107 that is to say the membrane spring, are made of a polymeric material.
  • This class of material includes or not charged polymers that is to say a system formed by a set of macromolecules of the same chemical nature in which organic and inorganic elements are added or not.
  • fillers for polymers fillers that are used as mechanical reinforcement in order to have a stronger material or fillers to achieve a tribological enhancement.
  • polymers have the first advantage of being cheap which leads to a low polymer part cost.
  • This low cost is associated with the fact that the polymer parts are easy to make.
  • the polymer parts can be manufactured by an injection process that is to say that the polymer is put in liquid form and is injected with more or less pressure in a mold comprising the cavity of the part to achieve.
  • This technique is inexpensive and allows to produce large series of high precision and with a good surface.
  • This injection method may also be useful for the second embodiment and for the third embodiment.
  • this translates into the possibility of overmolding the pellet 419 acting as a pivot module 109 directly.
  • This pellet 419 is placed in a mold whose imprint corresponds to that of the pivot system 105.
  • the kitten 500 in which the stone breakthrough 501 and the rock against pivot 503 are placed is placed in a mold into which is injected a liquid polymer.
  • the use of polymers is advantageous because these materials have interesting mechanical characteristics. Indeed, the polymers have in the first place a large capacity of deformation which allows them to easily absorb shocks. Nevertheless, this ability to deform easily can result in rupture of the membrane. To counter this, the polymer membrane can be made with a greater thickness resulting in greater strength of said membrane. Since the polymers have a low density in comparison with the metals (density of Polyoxymethylene or POM is about 1420 Kg / m 3 while the steel has a density of 7500 kg / m 3 ), this makes it possible to achieve larger parts without increasing the mass compared to a metal part.
  • the polymers also have advantageous tribological properties.
  • certain tribological polymer-metal and polymer-polymer pairs are advantageous so that the use of the polymers in the context of the bearing function is possible.
  • this function relates to the interaction between the bearing, that is to say, in the prior art, the set breakthrough stone, stone against pivot and the tigeron of the axis. This interaction occurs when the axis pivots causing friction between the axis via its tigeron and the bearing.
  • a tribological couple polymer-metal or polymer-polymer advantage allows in the case where the bearing is polymer and where the axis is metal or polymer to have lower friction. As these rubs cause wear on the parts that are the tigeron and the bearing, less friction leads to lower wear and therefore longer life. This also leads to energy losses that are lower which is very important for mechanical watches.
  • the elastic means 107 are made of a metal.
  • This metal can be pure or be an alloy or be a metal glass.
  • crystalline or amorphous metals have a large elastic modulus (for example, a spring steel with a Young's modulus of 200 GPa whereas polyoxymethylene or POM has a Young's modulus of 3.1 GPa) .
  • the metals also have a good elastic limit, that is to say a stress beyond which the material plastically deforms which is high.
  • this elastic limit is about twice as high as the equivalent of equivalent crystalline metal equivalent equivalent.
  • Amorphous metals are therefore materials that withstand a higher stress before plastically deforming.
  • the metals may have tribological properties in terms of coefficient of friction and wear rate so that a one-piece shockproof system 100 as defined in the first embodiment can cooperate with a metal axle rod without to cause greater wear, a coefficient of friction of 0.15 is a value sought for the anti-shock system according to the present invention.
  • the diaphragm spring 107 can be made by simple and inexpensive techniques such as cutting and folding to produce parts in large series.
  • amorphous metals or metallic glasses it is possible to use hot forming and casting to take advantage of the properties of metal glasses. Indeed, the casting can be used to make said membrane.
  • the material used is heated to a temperature above its melting temperature, said material thus becoming liquid. It is then poured into a mold. The material is then cooled rapidly so that the atoms composing said material can not arrange to form a structure, the absence of a structure allowing said material to be amorphous.
  • the advantage of casting an amorphous metal is to allow greater accuracy and greater strength of the cast object.
  • the amorphous metals when cast, have the advantage of having a solidification shrinkage of less than 1% while the casting of their crystalline equivalents has a solidification shrinkage of 5 to 7%.
  • This means that the amorphous material will keep the shape and dimensions of the place where it is poured while a crystalline material will contract.
  • the shrinkage of solidification can be taken into account during the manufacture of the mold, the fact of having a near zero withdrawal makes it possible to dispense with this step.
  • Hot forming is also a method that advantageously uses the properties of the amorphous metal. Indeed, this method consists in previously making an amorphous metal preform and placing it in two matrices. This preform is then heated to a temperature between the glass transition temperature and the crystallization temperature of the first material. In this range, the amorphous metal thus sees its viscosity greatly decrease so that it becomes easily manipulated. A low stress of the order of 1 MPa can therefore be applied to said material in order to insert it into the negative. This viscosity further allows the amorphous metal to fill the negative well so that the accuracy of this process is important. In the case of the first embodiment, hot forming makes it possible to perform the entire pivoting system 105 in a single step.
  • the elastic means 107 are made of a ceramic.
  • This ceramic may be an oxide, that is to say a polycrystalline material such as aluminum oxide or boron nitride or titanium carbide. This ceramic may also be a monocrystalline material such as silicon.
  • the use of ceramics to perform the pivot function is made possible because these materials have characteristics such as a coefficient of friction, hardness and wear resistance very interesting. Indeed, for the pivot function, it requires a material that supports the friction caused by the rotation of the axis carrying the wheel on said pivot. Preferably, the material constituting the pivot module 109 must cause the least amount of friction possible.
  • This advantage is combined with the high hardness of ceramics and their high resistance to wear, to obtain a pivot resistant to shocks and friction and thus to have a durable pivot.
  • the elastic means 107 are made of polymer and the pivot module 109 is ceramic in the case of the second embodiment.
  • One method used to make polycrystalline material parts is sintering.
  • This technique involves providing the ceramic or polycrystalline material in the form of powders. These powders are placed in a matrix and then compressed under high pressure of up to several thousand bar. A preform is then obtained which is placed in an oven to be heated to a temperature below the melting temperature of the main component constituting the powders. This step of climbing The temperature allows diffusion of the materials into each other so that the grains of powder bind in a solid manner.
  • a variation of this method is to mix these powders with a liquid so as to obtain a paste which is molded in a matrix and then dried so as to harden. The desired part is then obtained, which is then placed in an oven to be heated to a temperature below the melting temperature of the main powder element. This temperature rise step then allows diffusion of the materials into each other so that the powder grains bind in a solid manner.
  • the elastic means 107 comprise structures. These structures are in the form of openings or recesses. These openings or recesses are arranged on the disc-shaped base 200, 300, 400 or on the flange 207. These internal structures are preferably circular or oval shapes but other forms can be envisaged. These internal structures are used in order to adjust the axial and radial stiffness of the elastic means 107. Indeed, these internal structures causes a decrease in rigidity and have the consequence of making the ring more flexible in the areas where they are made. The elastic means 107 can then be deformed more easily in the areas where these structures are made. At least two openings or recesses diametrically opposite one another are arranged. This arrangement thus makes it possible to distribute the return forces. It will be understood that the number of structures is greater and that these structures are regularly distributed. This makes it possible to locally render said part more flexible so as to obtain predetermined return forces

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Springs (AREA)
  • Vibration Dampers (AREA)
  • Sliding-Contact Bearings (AREA)
EP11193835.3A 2011-12-15 2011-12-15 Stoßsicheres System mit Membran für Uhren Withdrawn EP2605086A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP11193835.3A EP2605086A1 (de) 2011-12-15 2011-12-15 Stoßsicheres System mit Membran für Uhren
PCT/EP2012/005139 WO2013087202A1 (fr) 2011-12-15 2012-12-13 Systeme antichoc a membrane pour piece d'horlogerie
EP12808257.5A EP2791741B1 (de) 2011-12-15 2012-12-13 Stosssicheres system mit membran für uhren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11193835.3A EP2605086A1 (de) 2011-12-15 2011-12-15 Stoßsicheres System mit Membran für Uhren

Publications (1)

Publication Number Publication Date
EP2605086A1 true EP2605086A1 (de) 2013-06-19

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EP11193835.3A Withdrawn EP2605086A1 (de) 2011-12-15 2011-12-15 Stoßsicheres System mit Membran für Uhren
EP12808257.5A Active EP2791741B1 (de) 2011-12-15 2012-12-13 Stosssicheres system mit membran für uhren

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP12808257.5A Active EP2791741B1 (de) 2011-12-15 2012-12-13 Stosssicheres system mit membran für uhren

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EP (2) EP2605086A1 (de)
WO (1) WO2013087202A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2884348A1 (de) * 2013-12-11 2015-06-17 The Swatch Group Research and Development Ltd. Stoßsicheres System aus zwei verschiedenen Materialien für Uhr
WO2017157540A1 (fr) * 2016-03-15 2017-09-21 The Swatch Group Research And Development Ltd Aiguille comportant une piece d'extremite et procede d'assemblage
EP3786726A1 (de) * 2019-09-02 2021-03-03 Valsigna GmbH Reibungsverhindernde hülle für schwenkbare elemente eines mechanischen uhrwerks

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2164937A1 (de) * 1971-12-23 1973-08-03 Portescap
US3942848A (en) * 1973-04-06 1976-03-09 Seitz S.A. Shock absorbing pivot bearing for rotary watch parts
FR2307175A2 (fr) * 1975-04-10 1976-11-05 Cattin Sa Ets Palier amortisseur de chocs perfectionne pour axes tournants ou oscillants
CH702314B1 (fr) * 2007-02-16 2011-06-15 Patek Philippe Sa Geneve Palier pour pièce d'horlogerie.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2164937A1 (de) * 1971-12-23 1973-08-03 Portescap
US3942848A (en) * 1973-04-06 1976-03-09 Seitz S.A. Shock absorbing pivot bearing for rotary watch parts
FR2307175A2 (fr) * 1975-04-10 1976-11-05 Cattin Sa Ets Palier amortisseur de chocs perfectionne pour axes tournants ou oscillants
CH702314B1 (fr) * 2007-02-16 2011-06-15 Patek Philippe Sa Geneve Palier pour pièce d'horlogerie.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2884348A1 (de) * 2013-12-11 2015-06-17 The Swatch Group Research and Development Ltd. Stoßsicheres System aus zwei verschiedenen Materialien für Uhr
WO2015086472A3 (fr) * 2013-12-11 2015-08-06 The Swatch Group Research And Development Ltd Système antichoc de pièce d'horlogerie bi-matiere
CN105814496A (zh) * 2013-12-11 2016-07-27 斯沃奇集团研究和开发有限公司 用于钟表的双材料防震系统
JP2016540217A (ja) * 2013-12-11 2016-12-22 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド ２種材料の時計用耐衝撃システム
US10012955B2 (en) 2013-12-11 2018-07-03 The Swatch Group Research And Development Ltd Bimaterial anti-shock system for timepieces
CN105814496B (zh) * 2013-12-11 2019-11-01 斯沃奇集团研究和开发有限公司 用于钟表的双材料防震系统
WO2017157540A1 (fr) * 2016-03-15 2017-09-21 The Swatch Group Research And Development Ltd Aiguille comportant une piece d'extremite et procede d'assemblage
US11156964B2 (en) 2016-03-15 2021-10-26 The Swatch Group Research And Development Ltd Hand comprising an end piece and assembly method
EP3786726A1 (de) * 2019-09-02 2021-03-03 Valsigna GmbH Reibungsverhindernde hülle für schwenkbare elemente eines mechanischen uhrwerks

Also Published As

Publication number Publication date
WO2013087202A1 (fr) 2013-06-20
EP2791741A1 (de) 2014-10-22
EP2791741B1 (de) 2020-06-24

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