EP2874019B1 - Endkurve für eine Spiralfeder, die über ihr äußeres Ende angetrieben wird - Google Patents

Endkurve für eine Spiralfeder, die über ihr äußeres Ende angetrieben wird Download PDF

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Publication number
EP2874019B1
EP2874019B1 EP13193032.3A EP13193032A EP2874019B1 EP 2874019 B1 EP2874019 B1 EP 2874019B1 EP 13193032 A EP13193032 A EP 13193032A EP 2874019 B1 EP2874019 B1 EP 2874019B1
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EP
European Patent Office
Prior art keywords
balance
spring
hairspring
curve
radius
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.)
Active
Application number
EP13193032.3A
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English (en)
French (fr)
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EP2874019A1 (de
Inventor
Mathieu Barraud
Maxime Danielou
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.)
Richemont International SA
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Richemont International SA
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Application filed by Richemont International SA filed Critical Richemont International SA
Priority to EP13193032.3A priority Critical patent/EP2874019B1/de
Publication of EP2874019A1 publication Critical patent/EP2874019A1/de
Application granted granted Critical
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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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/066—Manufacture of the spiral spring
    • 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
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance

Definitions

  • the present invention relates to a spiral spring intended to be included in a regulating member with a balance of a watch movement.
  • the invention also relates to a regulating member comprising the spiral spring and a watch movement comprising the regulating member.
  • the mechanical regulating organs include a balance driven on a rotating axis and a balance spring whose contractions determine the rate of the watch.
  • the inner end of the hairspring is integrally linked to the axis of the balance through the ferrule.
  • the outer end of the hairspring is for its part integrally linked to the plate or to the balance bridge through a stud.
  • shock absorbers such as Incablocs® systems are generally used, which allow axial shocks to be absorbed on the axis of the balance, while allowing rotation with less friction.
  • Incablocs® systems are generally used, which allow axial shocks to be absorbed on the axis of the balance, while allowing rotation with less friction.
  • these shock absorbers make the regulating member more expensive and increase its complexity and the difficulty of assembly.
  • balance axis is generally linked to a balance bridge which increases the thickness of the movement.
  • EP1605322 describes a regulating member in which the inner end of the spring is linked to the axis of the balance through a ferrule free to move axially along this axis. This solution does not solve the mentioned isochronism problem.
  • Requirement EP2063325 by the present applicant discloses a regulating member with a balance and a double hairspring, in which the outer end of each hairspring is secured to the balance, and the inner end of each hairspring is secured to a fixed point of the movement, for example of a fixed axis.
  • the outer end of each hairspring includes a 90 ° bend.
  • the document FR1540160 describes a hairspring for a clockwork movement, the end of at least one of its end turns of which is coiled, out of the plane of the hairspring, to constitute the ferrule, alternately the hairspring peak or both.
  • the document EP2196867 discloses a hairspring with rising curve in silicon-based material comprising a hairspring made in one piece and coaxially with a ferrule, an end curve and a lifting device between the outer turn of said hairspring and said end curve .
  • Requirement CH700260 reveals a spiral spring with an inner part 12 fixed on the shaft 6 and an outer part fixed on the balance 2.
  • the terminal curve does not extend out of the plane from the outer coil and has only one radius of curvature.
  • An object of the present invention is to provide a spiral spring free from the limitations of the state of the art.
  • a spiral spring intended to be included in a member regulating with a balance of a watch movement and comprising an inner end, an end curve and an outer end; the inner end of the hairspring being integral with a fixed point of the movement; the outer end of the hairspring being integral with the balance so that the hairspring can be driven by its outer end; and the terminal curve extending above the plane of the hairspring from the outer turn thereof and having a shape allowing the position of the center of gravity of the hairspring to coincide with its center of rotation.
  • the end curve includes a first portion having a first radius of curvature and a second portion having a second radius of curvature reversed from the first radius of curvature.
  • the terminal curve further comprises a rectilinear connection zone between the two portions.
  • the invention also relates to a regulating member comprising the spiral spring and a watch movement comprising the regulating member.
  • a clockwork spiral spring 1 (or spiral) according to the invention comprises a flat spiral part 10 and a raised end curve 3 extending outside (above or below) the flat spiral part 2 from a point 11 of the outer turn 8 of this flat spiral part 2.
  • the hairspring 1 with its end curve 3 can be obtained by deformation of the outer turn 8 of an initial plane hairspring.
  • an inner end 2 of the hairspring 1 is intended to be fixed integral with a fixed point of the movement and an outer end 4 of the hairspring 1 is intended to be fixed integral with a balance of a regulating member d 'a mechanical watch movement.
  • end of the hairspring can encompass the end curve 3 or in general the entire portion at each end of the hairspring 1, the deformation of which is negligible compared to that of the entire hairspring, for example the last turn at each end of the hairspring.
  • the figure 2 shows a top view of a balance 5 comprising the spiral spring 1 according to the invention.
  • the inner end 2 of the hairspring 1 is fixed to a fixed axis 7 of the balance 1, for example, by means of a ferrule 70.
  • the balance 5 is configured to be able to rotate around the fixed axis 7 relative to the movement of the watch, for example, relative to a plate (not shown).
  • the lateral and axial guidance of the balance 5 on the axis 7 can be provided by guide elements (not shown) integral with the balance.
  • the axis 7 being fixed, shock absorbers are not necessary.
  • the other elements of the regulating organ are conventional and are not shown. It is however accepted that the balance is set in motion, for example, thanks to the energy supplied by an escape wheel and an escape anchor (not shown).
  • the outer end 4 of the hairspring is integral with the balance 5 so that the hairspring can be driven by its outer end.
  • the outer end 4 is fixed to the balance 5 at an attachment point 12 located on one of the arms 50 of the balance.
  • the attachment point 12 could also be located on a flywheel 51 of the balance. Note that it is however also possible to use a rotary axis, for example the axis of the balance, and to fix the inner end 2 of the hairspring 1 to another point by means of a piton and a bridge (not shown).
  • the shape of the end curve 3 is determined so that the center of gravity of the hairspring 1 is permanently substantially coincident with the center of rotation 9, so that the turns of the flat spiral part 2 of the hairspring 1 are deformed concentrically during the oscillations. of the last.
  • center of gravity of the hairspring 1 is in fact meant the center of gravity of the elastic part of the hairspring 1.
  • the center of gravity within the meaning of the invention is a center of deformation.
  • the spiral spring 1 comprises an end curve 3 which extends outside the plane of the balance-spring from the outer turn 8 of the latter and whose shape is chosen to modify the position of the center of gravity of the balance-spring 1 and to make it coincide with its center of rotation 9.
  • the shape of the terminal curve 3 makes it possible to satisfy the Phillips condition, that is to say, the shape of the terminal curve 3 makes it possible to bring the center of gravity of the hairspring 1 back to axis 7 (coinciding with its center of rotation 9) while having an attachment point 12 located at a radius (from this center of rotation) large enough to let the hairspring 1 operate freely.
  • the point of attachment 12 is preferably at a radius which is considerably greater than the radius of the last turn of the flat spiral part 10
  • the end curve 3 participates in the elastic deformations of the hairspring 1 and allows the latter to deform concentrically during its operation. It consists of circular segments and / or rectilinear and is obtained by permanent deformation of the outer turn 8 of the initial plane balance spring 2.
  • the terminal curve 3 takes the form of an "S" curve.
  • the terminal "S" curve 3 may include a first portion 31 having a first radius of curvature and a second portion 32 having a second radius of curvature reversed with respect to the first radius of curvature.
  • the terminal curve 3 can also include a rectilinear connection zone between the two portions 31, 32.
  • the torque created by the first and second curvatures 31, 32 compensates for the natural deployment of the hairspring 1 away from the attachment point 12 so that the center of gravity of the hairspring 1 remains very close to its center of rotation 9.
  • the position of the center of gravity has been measured, and the inventors have found that it has a variation of the order of 1 ⁇ m with respect to the center of rotation 9 of the hairspring 1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Springs (AREA)

Claims (8)

  1. Spiralfeder (1), die dazu vorgesehen ist, in einem Regulierorgan mit einer Unruh (5) eines Uhrwerks enthalten zu sein, und ein inneres Ende (2), eine Endkurve (3) und ein äußeres Ende (4) umfasst;
    wobei das innere Ende (2) der Spirale (1) dazu vorgesehen ist, mit einem festen Punkt (6) des Uhrwerks fest verbunden zu sein;
    wobei das äußere Ende (4) der Spirale (1) dazu bestimmt ist, mit der Unruh (5) fest verbunden zu sein, so dass die Spirale über ihr äußeres Ende antreibbar ist; dadurch gekennzeichnet, dass
    sich die Endkurve (3) aus der Ebene der Spirale von deren äußerer Windung (8) aus erstreckt; wobei die Endkurve (3) einen ersten Abschnitt (31) mit einem ersten Krümmungsradius und einen zweiten Abschnitt (32) mit einem zweiten Krümmungsradius, der in Bezug auf den ersten Krümmungsradius umgekehrt ist, aufweist, so dass die Position des Schwerpunkts der Spirale (1) mit ihrem Drehpunkt (9) zusammenfällt.
  2. Spiralfeder (1) nach Anspruch 1,
    wobei die Endkurve (3) die Form einer S-Kurve aufweist.
  3. Spiralfeder (1) nach Anspruch 2,
    wobei die Endkurve (3) ferner einen geradlinigen Verbindungsbereich zwischen den beiden Abschnitten (31, 32) aufweist.
  4. Regulierorgan, umfassend eine Unruh (5) und die Spiralfeder (1) nach einem der Ansprüche 1 bis 3, wobei das innere Ende (2) der Spirale (1) mit einem festen Punkt (6) des Uhrwerks fest verbunden ist; und wobei das äußere Ende (4) der Spirale (1) mit der Unruh (5) fest verbunden ist, so dass die Spirale über ihr äußeres Ende antreibbar ist.
  5. Regulierorgan nach Anspruch 4, wobei die Achse der Unruh (5) fest ist und das innere Ende (2) der Spirale (1) mit dieser Achse fest verbunden ist.
  6. Regulierorgan nach Anspruch 4 oder Anspruch 5, wobei sich der Befestigungspunkt (12) des äußeren Endes (4) der Spirale (1) auf einem Radius befindet, der größer als der Radius der letzten Windung der Spirale ist.
  7. Regulierorgan nach Anspruch 6, wobei sich der Befestigungspunkt (12) des äußeren Endes (4) der Spirale (1) an einem Arm der Unruh (5) befindet.
  8. Uhrwerk, umfassend ein Regulierorgan nach einem der Ansprüche 4 bis 7.
EP13193032.3A 2013-11-15 2013-11-15 Endkurve für eine Spiralfeder, die über ihr äußeres Ende angetrieben wird Active EP2874019B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13193032.3A EP2874019B1 (de) 2013-11-15 2013-11-15 Endkurve für eine Spiralfeder, die über ihr äußeres Ende angetrieben wird

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13193032.3A EP2874019B1 (de) 2013-11-15 2013-11-15 Endkurve für eine Spiralfeder, die über ihr äußeres Ende angetrieben wird

Publications (2)

Publication Number Publication Date
EP2874019A1 EP2874019A1 (de) 2015-05-20
EP2874019B1 true EP2874019B1 (de) 2021-01-13

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Application Number Title Priority Date Filing Date
EP13193032.3A Active EP2874019B1 (de) 2013-11-15 2013-11-15 Endkurve für eine Spiralfeder, die über ihr äußeres Ende angetrieben wird

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3182215A1 (de) * 2015-12-14 2017-06-21 Novasort SA Schwingsystem für uhr

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7112818U (de) * 1971-04-02 1973-04-19 Haas C Spiralfeder

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1540160A (fr) * 1967-10-09 1968-09-20 Nationale De Ressorts S A Fab Spiral, notamment pour mouvement d'horlogerie
DE6804867U (de) * 1968-10-28 1969-04-17 Pforzheimer Uhren Rohwerke Elektrisch betriebene uhr, insbes. armbanduhr
CH697208A5 (fr) 2004-04-08 2008-06-25 Coredem Sa Ensemble balancier-spiral pour mouvement d'horlogerie mécanique.
EP2063325B1 (de) 2007-11-20 2012-12-26 Richemont International S.A. Mechanisches Uhrwerk
EP2196867A1 (de) * 2008-12-15 2010-06-16 Montres Breguet S.A. Spirale mit Kurvenerhöhung aus Material auf Siliziumbasis
CH700260B1 (fr) * 2009-01-16 2015-01-15 Cartier Création Studio Sa Balancier spiral sans élément de réglage.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7112818U (de) * 1971-04-02 1973-04-19 Haas C Spiralfeder

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