EP3825786B1 - Anzeigemechanismus einer uhr - Google Patents

Anzeigemechanismus einer uhr Download PDF

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Publication number
EP3825786B1
EP3825786B1 EP19210650.8A EP19210650A EP3825786B1 EP 3825786 B1 EP3825786 B1 EP 3825786B1 EP 19210650 A EP19210650 A EP 19210650A EP 3825786 B1 EP3825786 B1 EP 3825786B1
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EP
European Patent Office
Prior art keywords
display mechanism
pinion
friction spring
display
bearing surface
Prior art date
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Application number
EP19210650.8A
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English (en)
French (fr)
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EP3825786A1 (de
Inventor
Anthony Krüttli
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0804—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms

Definitions

  • the present invention is defined by the appended claims, and relates to a mechanism for displaying a timepiece, disengageable by means of a friction coupling, and comprising a mobile display comprising a shaft on which are mounted integrally a board and a display member, a pinion mounted free to rotate around said shaft and having a bearing surface, as well as a friction spring arranged to frictionally couple the board and said bearing surface of the pinion.
  • the present invention also relates to a chronograph mechanism comprising such a display mechanism, said display mechanism being a chronograph counter, as well as a timepiece comprising such a display mechanism.
  • the term "chronograph counter” is generally used to refer to a mechanism arranged to indicate, by means of a corresponding display device, such as a hand, the number of any unit of time counted by the chronograph, whether for example the number of fractions of seconds (1/10 s, 1/100 s), of seconds, of minutes, or even possibly of hours.
  • the counter mobile can therefore be, for example, a chronograph mobile for counting seconds, a tenth or hundredth counter mobile for counting 1/10 or 1/100 of a second, a minute counter mobile for counting minutes, or an hour counter mobile for counting hours.
  • the counters must be reset before a new measurement can be made.
  • the document CH340191A shows a mechanism for displaying a timepiece, disengageable by means of a friction coupling, and comprising a display mobile comprising a shaft on which are mounted integrally a plate and a display member, a wheel mounted free to rotate around said shaft and having a bearing surface, as well as a friction spring arranged to frictionally couple the plate and said bearing surface of the wheel.
  • a display of the day, the date, or the months in a date mechanism can be corrected independently of the movement by means of a friction coupling.
  • the friction constitutes a coupling means that is difficult to adjust, in particular in a chronograph requiring very high precision.
  • the friction must be high enough to guarantee the coupling of the plate and the pinion, in particular in the event of impact, but however not too high to allow the correction of the display member, and more specifically the resetting of the counter in the case of a chronograph.
  • a friction torque of the order of 40 to 80 ⁇ Nm is desired when the correction is carried out directly by a user by means of a pusher for example, while a friction torque of the order of 6 to 8 ⁇ Nm is desired when the correction is carried out by an internal control, such as a column wheel.
  • a friction spring is an additional element added to the mobile display which will cause an increase in the total thickness of the mechanism.
  • a traditional "spring washer” friction spring has the advantage of being very thin and of not increasing too much the total thickness of the mechanism.
  • this type of spring generates a friction torque with a large dispersion between the different parts produced.
  • a friction spring positioned above the board and comprising two blades arranged to clamp a support surface of the pinion makes it possible to generate a friction torque having low dispersion between the various parts produced.
  • it has the disadvantage of being thick and significantly increases the total thickness of the mechanism, resulting in significant bulk.
  • the present invention aims to remedy these drawbacks by proposing a disengageable display mechanism by means of a friction coupling having the lowest possible overall height so as to present a reduced bulk, particularly sought after in a chronograph mechanism.
  • the present invention also aims to propose a disengageable display mechanism by means of a friction coupling making it possible to generate an adequate friction torque having low dispersion between the various parts produced.
  • the present invention relates to a disengageable display mechanism by means of a friction coupling and comprising a mobile display comprising a shaft on which are mounted integrally a board and a display member, a pinion mounted free in rotation around said shaft and having a bearing surface, as well as a friction spring arranged to frictionally couple the board and said bearing surface of the pinion.
  • the board comprises a housing in which said friction spring and the bearing surface of the pinion are at least partially housed, and preferably entirely said friction spring and at least partially the bearing surface of the pinion.
  • the disengageable display mechanism by means of a friction coupling according to the invention has a reduced height, and consequently a small footprint.
  • the friction spring comprises at least one blade made of a material based on silicon or NiP.
  • the present invention also relates to a chronograph mechanism comprising a display mechanism as defined above, said mechanism display then being a chronograph counter, and the display mobile being a chronograph counter mobile cooperating with a display member to display a measured time.
  • the present invention also relates to a timepiece comprising such a display mechanism, and in particular a timepiece comprising such a chronograph mechanism.
  • the present invention relates to a disengageable display mechanism by means of a friction coupling, and comprising a mobile display comprising a shaft on which are integrally mounted a board and a display member, a pinion mounted free to rotate around said shaft and having a bearing surface, as well as a friction spring arranged to frictionally couple the board and said bearing surface of the pinion.
  • the board comprises a housing in which said friction spring and the bearing surface of the pinion are at least partially housed.
  • the display mechanism according to the invention is more particularly a chronograph counter mechanism intended to be used in a chronograph mechanism of a timepiece.
  • a “chronograph counter mechanism” within the meaning of the present invention is a mechanism provided in the chronograph gear train of the chronograph mechanism to indicate the number of any unit of time measured by the chronograph mechanism, by means of a corresponding display device, such as a hand, an index, a disc or any other equivalent device, cooperating with a corresponding scale provided on a dial of the timepiece.
  • This number of measured time units can for example be the number of fractions of seconds (1/10 s, 1/100 s), of seconds, of minutes, or even possibly of hours.
  • the counter wheel set of the invention can therefore be, for example, a chronograph wheel set for counting seconds, a tenth or hundredth counter wheel set for counting 1/10 or 1/100 of a second, a minute counter wheel set for counting minutes, or an hour counter wheel set for counting hours.
  • the chronograph counter mechanism of the invention can be implemented in an autonomous chronograph mechanism having its own watch movement with its own oscillating regulator and its autonomous energy source or in a chronograph mechanism linked to a basic movement whose energy source also supplies the chronograph mechanism.
  • the chronograph counter mechanism 1 comprises a counter mobile 2 comprising a shaft 4 mounted to pivot around an axis A and on which are mounted integrally a plate 6 and a reset core (not shown).
  • Shaft 4 also carries a chronograph display member, such as a chronograph hand (not shown).
  • the core cooperates with a hammer (not shown) actuated by a control device (not shown) for resetting the chronograph hand.
  • Plate 6 may include peripheral external toothing 6a if a kinematic connection with another element of the chronograph gear train, such as another counter, is necessary (for example if counter wheel set 1 is a chronograph wheel set for counting seconds, the toothing of plate 6 then meshes with a driving wheel set for the minute counter).
  • another element of the chronograph gear train such as another counter
  • the counter wheel set 2 also comprises a pinion 10 secured to a shaft 12 mounted free to rotate around the shaft 4, coaxially with the axis A.
  • the pinion 10 is for example intended to be directly or indirectly kinematically connected to the source of energy of the chronograph mechanism or of the basic movement when the counter wheel set 1 is a chronograph wheel set for counting the seconds, or to another intermediate element of the chronograph gear train intended to drive it in rotation.
  • the pinion 10 has a radial bearing surface 14.
  • a washer 16 is fixed integrally to the base of the shaft 12, between the board 6 and the pinion 10.
  • the peripheral side surface of the washer 16 constitutes the bearing surface 14 of the pinion 10, as will be described below.
  • a friction spring 18, fixed integrally on the board 6, is provided so as to frictionally couple the board 6 and the pinion 10 via its bearing surface 14 so that they can pivot together around the axis A for counting the time units and so that they can uncouple to allow the counters to be reset to zero.
  • the board 6 comprises a central circular inner housing with respect to the axis A, in which the friction spring 18 and the bearing surface 14 of the pinion 10 are housed at least partially, and preferably entirely.
  • the washer 16 secured to the pinion 10 and forming its bearing surface 14 is housed at least partially, and preferably mainly, in the housing of the board 6.
  • the board 6 therefore has a sufficient height H to at least partially house the friction spring 18 and the bearing surface 14 of the pinion 10 therein. This effect and that the bearing surface 14 of the pinion 10 is housed largely in said housing, so that the friction spring 18 and a very large part of the bearing surface 14 of the pinion are integrated inside the volume of the board 6.
  • the board 6 comprises a central circular hollow 20 with respect to the axis A, said hollow 20 forming said housing receiving the friction spring 18 and the washer 16 forming the bearing surface 14 of the pinion 10.
  • the bottom of the recess 20 can be solid, the friction spring and the washer forming the bearing surface of the pinion being positioned above the bottom of the recess 20, which is integral with the shaft 4. Thus, the maintenance of the board 6 on the shaft 4 is separated from the friction.
  • the recess 20 has various recesses 22 on its bottom so that the board 6 comprises a hub 24 secured to the shaft 4 and its bearing surface 8, a rim 26 with a high edge, comprising, where appropriate, at its outer periphery the toothing 6a, and at least one rigid arm 28 (here five arms) connecting the hub 24 to the base of the rim 26.
  • the friction spring 18 and the washer 1 6 forming the bearing surface 14 of the pinion 10 are positioned above the hub 24, which makes it possible to separate the maintenance of the board 6, by its hub 24, on the shaft 4 from the friction.
  • the board 6 and the friction spring 18 form two distinct parts, manufactured separately.
  • the friction spring 18 comprises a base 30, arranged to be fixed in an integral manner in the housing formed in the plate 6, and at least one elastic blade 32, and preferably two elastic blades 32, projecting from said base 30 in the direction of the bearing surface 14 of the pinion 10 and arranged to come to press radially on the side surface of the washer 16 in order to press on the said bearing surface 14 of the pinion 1 0 to tighten it and form the friction.
  • the spring comprises a single flexible blade
  • a rigid counter-support is provided. Each blade 32 is secured to the base 30 by one end and has a support surface 32a coming to bear radially on the washer 16.
  • the blades 32 projecting from the base 30 are positioned above the bottom of the recess 20, and in particular above the arms 28 and the hub 24, and pass on either side of the washer 16 positioned above the hub 24.
  • the maintenance of the board 6 on the shaft 4, by its hub 24, is separated from the friction ensured by the blades and the washer 16 above said hub 24.
  • the recess 20 has at its periphery an additional cutout forming in the rim 26 an inner peripheral annular recess 34 arranged to receive the base 30 of the friction spring 18.
  • the height H of the serge 26, corresponding to the height of the board 6, is chosen so that its inner peripheral annular hollow 34 has a height at least equal to the height of the base 30 of the friction spring 18.
  • the base 30 of the friction spring is fully integrated into said annular hollow 34.
  • the blades 32 have the same height as the base 30.
  • the height of the washer 16 is slightly greater than those of the blades 32 and lower than the height of the recess 20.
  • the base 30 of the friction spring 18 has the shape of a ring from the inside of which protrudes at least one blade, and preferably two blades 32, said ring being arranged to be fixed integrally on said inner peripheral annular hollow 34 of the rim 26.
  • the dimensions of the ring are chosen so that it fits entirely into the inner peripheral annular hollow 34.
  • the height H of the serge 26 or of the board 6 can be increased if it is necessary to use a friction spring 18 having a base 30 and higher blades 32, as shown in picture 3 .
  • the friction spring 18 can be fixed integrally to the board by any known means, such as gluing or welding.
  • the friction spring 18 comprises elastic means for fixing to the board making it possible to easily disassemble the friction spring.
  • the base 30 of the friction spring 18 is in the form of a ring fixed to the board by means of elastic segments 36 formed in the ring and held by friction to the side wall 34a of the inner peripheral annular recess 34.
  • the plate 6 and the friction spring 18 are monolithic, that is to say made from a single piece.
  • the housing formed by the recess has an inner side wall from which protrudes at least one blade, and preferably two blades, of the friction spring, in the direction of the bearing surface 14 of the pinion 10.
  • At least the blade(s) 32 of the friction spring 32 are made of a silicon-based material (such as Si/SiO2).
  • the friction spring 18 is made of a silicon-based material, and manufactured for example by DRIE (Deep Reactive Ion Etching), for example with a base in the form of a ring as shown in the figures 1 to 3 or monolithically with board 6.
  • NiP nickel-based material
  • copper-based material preferably using the LIGA process
  • steel for example.
  • the friction spring 18 and the plate 6 are two separate parts, the friction spring can preferably be made from silicon, but also steel or NiP, and the plate 6 can be made of copper, brass, steel, silicon, etc.
  • friction spring 18 and the plate 6 are monolithic, they can preferably be made from silicon or from steel.
  • the material of the washer 16 is chosen to withstand the friction with the blades 32 of the friction spring 18.
  • the washer 16 is made of steel if the blades are based on silicon or based on silicon if the blades are made of steel.
  • the display mechanism and more specifically the chronograph counter according to the invention makes it possible to integrate the friction spring 18 and a large part of the bearing surface 14 of the pinion entirely inside the volume of the board 6, so that the friction spring does not protrude from the board. Therefore, the total height of the display mechanism and in particular of the chronograph counter of the invention is significantly reduced, being able to be divided by two with respect to the height of a known chronograph counter mechanism. In addition, the functions of guiding the board and friction are separated, allowing precise positioning of the board necessary in a chronograph counter mechanism. In addition, the use of a silicon-based material makes it possible to control the friction torque.
  • the display mechanism and in particular the chronograph counter, according to the invention is thin and precise.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)

Claims (15)

  1. Anzeigemechanismus (1) einer Uhr, der mittels einer Reibungskupplung auskuppelbar ist und ein Anzeigedrehteil (2) umfasst, das eine Welle (4), an der eine Platte (6) und ein Anzeigeorgan fest verbunden montiert sind, einen Trieb (10), der frei um die Welle (4) drehbar gelagert ist und eine Auflagefläche (14) aufweist, sowie eine Friktionsfeder (18) umfasst, die dazu gestaltet ist, die Platte (6) und die Auflagefläche (14) des Triebs (10) durch Reibung anzukoppeln, wobei die Platte (6) eine Aufnahme umfasst, in der die Friktionsfeder (18) und die Auflagefläche (14) des Triebs (10) zumindest teilweise aufgenommen sind.
  2. Anzeigemechanismus (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Aufnahme der Platte (6) dazu gestaltet ist, die Friktionsfeder (18) vollständig und die Auflagefläche (14) des Triebs (10) zumindest teilweise darin aufzunehmen.
  3. Anzeigemechanismus (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Platte (6) eine kreisförmige mittlere Vertiefung (20) umfasst, welche die Aufnahme bildet.
  4. Anzeigemechanismus (1) nach Anspruch 3, dadurch gekennzeichnet, dass die Vertiefung (20) Aussparungen (22) aufweist, derart dass die Platte (6) eine Nabe (24), die fest mit der Welle (4) verbunden ist und über der die Auflagefläche (16) des Triebs (10) positioniert ist, einen Fußkreis (26) und mindestens einen Arm (28) umfasst, der die Nabe (24) mit dem Fußkreis (26) verbindet.
  5. Anzeigemechanismus (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Friktionsfeder (18) eine Basis (30), die dazu gestaltet ist, auf fest verbundene Weise in der Aufnahme der Platte (6) befestigt zu werden, und mindestens ein Blatt (32) umfasst, das von der Basis (30) in Richtung des Triebs (10) hervorsteht und dazu gestaltet ist, auf der Auflagefläche (14) des Triebs (10) aufzuliegen, um die Reibung zu bilden.
  6. Anzeigemechanismus (1) nach Anspruch 4 und 5, dadurch gekennzeichnet, dass der Fußkreis (26) eine innere umlaufende ringförmige Vertiefung (34) umfasst, die dazu gestaltet ist, die Basis (30) der Friktionsfeder (18) aufzunehmen.
  7. Anzeigemechanismus (1) nach Anspruch 6, dadurch gekennzeichnet, dass die innere umlaufende ringförmige Vertiefung (34) des Fußkreises (26) eine Höhe aufweist, die mindestens gleich der Höhe der Basis (30) der Friktionsfeder (18) ist.
  8. Anzeigemechanismus (1) nach Anspruch 7, dadurch gekennzeichnet, dass die Basis (30) der Friktionsfeder die Form eines Ringes aufweist, aus dessen Inneren mindestens ein Blatt (32) hervorsteht, wobei der Ring dazu gestaltet ist, auf fest verbundene Weise an der inneren umlaufenden ringförmigen Vertiefung (34) des Fußkreises (26) befestigt zu werden.
  9. Anzeigemechanismus (1) nach Anspruch 8, dadurch gekennzeichnet, dass die Friktionsfeder (18) elastische Mittel (36) zur Befestigung an der Platte (6) umfasst.
  10. Anzeigemechanismus (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Friktionsfeder und die Platte monolithisch sind, wobei die Aufnahme eine innere seitliche Wand aufweist, von der mindestens ein Blatt der Friktionsfeder hervorsteht.
  11. Anzeigemechanismus (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Trieb (10) fest mit einer Unterlagscheibe (16) verbunden ist, die seine Auflagefläche (14) bildet, wobei die Unterlagscheibe (16) zumindest teilweise in der Aufnahme der Platte (6) aufgenommen ist.
  12. Anzeigemechanismus (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Blatt (32) der Friktionsfeder (18) aus einem Material hergestellt ist, das ausgewählt ist aus der Gruppe, die ein Material auf Siliziumbasis, ein Material auf Nickelbasis, ein Material auf Kupferbasis und Stahl umfasst.
  13. Anzeigemechanismus (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Anzeigedrehteil (2) ein Chronographenzähler-Drehteil ist, das mit einem Anzeigeorgan zusammenwirkt, um eine genommene Zeit anzuzeigen.
  14. Chronographenmechanismus, der mindestens einen Anzeigemechanismus nach einem der Ansprüche 1 bis 13 umfasst.
  15. Uhr, die einen Anzeigemechanismus nach einem der Ansprüche 1 bis 13 oder einen Chronographenmechanismus nach Anspruch 14 umfasst.
EP19210650.8A 2019-11-21 2019-11-21 Anzeigemechanismus einer uhr Active EP3825786B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19210650.8A EP3825786B1 (de) 2019-11-21 2019-11-21 Anzeigemechanismus einer uhr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19210650.8A EP3825786B1 (de) 2019-11-21 2019-11-21 Anzeigemechanismus einer uhr

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EP3825786A1 EP3825786A1 (de) 2021-05-26
EP3825786B1 true EP3825786B1 (de) 2023-07-26

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH340191A (fr) * 1957-07-23 1959-07-31 Ancienne Manufacture D Horloge Montre
CH690524A5 (fr) * 1995-10-31 2000-09-29 Rolex Montres Pièce d'horlogerie à mécanisme de chronographe.
CH710467B1 (fr) * 2014-12-12 2019-02-15 Richemont Int Sa Roue pour mobile à friction de mécanisme horloger et mobile à friction correspondant.

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