EP1921517B1 - Montageelement, das dehnbare Strukturen in Form von Gabeln umfasst, und dieses Element umfassende Uhr - Google Patents

Montageelement, das dehnbare Strukturen in Form von Gabeln umfasst, und dieses Element umfassende Uhr Download PDF

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Publication number
EP1921517B1
EP1921517B1 EP06123783A EP06123783A EP1921517B1 EP 1921517 B1 EP1921517 B1 EP 1921517B1 EP 06123783 A EP06123783 A EP 06123783A EP 06123783 A EP06123783 A EP 06123783A EP 1921517 B1 EP1921517 B1 EP 1921517B1
Authority
EP
European Patent Office
Prior art keywords
branch
assembly element
elastic
bridge
arbour
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
EP06123783A
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English (en)
French (fr)
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EP1921517A1 (de
Inventor
Roland Bitterli
Wilfried Noell
Fabien Blondeau
Lionel Paratte
Toralf Scharf
Pierre-André Meister
André Zanetta
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 EP06123783A priority Critical patent/EP1921517B1/de
Priority to DE602006014280T priority patent/DE602006014280D1/de
Priority to AT06123783T priority patent/ATE467860T1/de
Priority to SG200717510-2A priority patent/SG143145A1/en
Priority to KR1020070112991A priority patent/KR101245905B1/ko
Priority to CN2007101999408A priority patent/CN101183238B/zh
Priority to US11/937,696 priority patent/US7572050B2/en
Priority to JP2007291856A priority patent/JP5175523B2/ja
Publication of EP1921517A1 publication Critical patent/EP1921517A1/de
Priority to HK08112399.4A priority patent/HK1120872A1/xx
Application granted granted Critical
Publication of EP1921517B1 publication Critical patent/EP1921517B1/de
Active legal-status Critical Current
Anticipated expiration legal-status 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/04—Hands; Discs with a single mark or the like
    • G04B19/042—Construction and manufacture of the hands; arrangements for increasing reading accuracy
    • 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
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/11—Hermetic sealing of openings, joints, passages or slits of the back cover of pocket or wrist watches
    • 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
    • G04B13/022—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft with parts made of hard material, e.g. silicon, diamond, sapphire, quartz and the like
    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0043—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms
    • G04D3/0046—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms for hands

Definitions

  • the invention relates to an assembly element and a timepiece comprising such an element.
  • the invention more particularly relates to an assembly element made in a plate of brittle material such as silicon, in particular for a timepiece, having an opening provided for the axial insertion of a shaft, the inner wall of the opening having elastic structures which are etched in the plate and which each have at least one bearing surface for radially clamping the shaft to ensure attachment of the connecting member with respect to the shaft.
  • the assembly elements such as the watch hands and the gears are fixed on their rotary shaft by driving, that is to say that a hollow cylinder is forced on an axis. having a diameter slightly greater than the inside diameter of the cylinder.
  • the elastic and plastic properties of the material used generally a metal, are used for this hunting.
  • a hollow cylinder on a conventional rotating shaft such as those used in mechanical watchmaking , with a diameter tolerance of the order of +/- 5 microns.
  • the fixing solution of the connecting element such as a needle must provide sufficient force to hold the element in place during shocks.
  • the force required for a conventional watchmaking needle is for example of the order of a Newton.
  • the invention aims to remedy these problems by proposing an improved elastic structure, in particular to allow the use of the assembly element as a rotary element in a clockwork mechanism, in particular as a watchmaker's hand.
  • the invention proposes an assembly element according to claim 1.
  • the assembly element according to the invention makes it possible to improve the clamping force against the shaft, to allow a better distribution of the forces related to the elastic deformation in the material constituting the connecting element, and to allow a better control of the clamping force obtained on the shaft, while remaining away from the breaking point of the material.
  • the elastic structures according to the invention offer a radial clearance, following their elastic deformation, which is large enough to compensate for manufacturing tolerances applied to the diameter of a shaft such as those used in timepieces. for the training of the needles.
  • the invention also proposes a timepiece characterized in that it comprises at least one connecting element according to one of the preceding characteristics.
  • FIG 1 schematically shows a timepiece 10 which is made in accordance with the teachings of the invention.
  • the timepiece 10 comprises a movement 12 mounted inside a casing 14 closed by a lens 16.
  • the movement 12 drives in rotation, about an axis A1, analog display means constituted here by a hour hand 18, a minute hand 20, and a second hand 22, these hands extending above a dial 24.
  • the needles 18, 20, 22 are fixed on shafts 26, 28, 30 of cylindrical rotation coaxial elastic clamping, like a hunting, as will be seen later.
  • the shafts 26, 28, 30 are conventional shafts commonly used in watch movements, for example shafts made of metal or plastic material.
  • the needles 18, 20, 22 constitute connecting elements, each needle 18, 20, 22 being made in a plate of brittle material, preferably of crystalline material based on silicon, and being designed to be assembled on its shaft 26 , 28, 30.
  • Each needle 18, 20, 22 here comprises a fixing ring 31 which defines an opening 32 provided to allow the attachment of the needle 18, 20, 22 on the shaft 26, 28, 30 associated by axial insertion in the opening 32.
  • the inner wall 33 of the opening 32 comprises elastic structures 34 which are etched in the plate forming the fixing ring 31 and which each comprise bearing surfaces 36, 38 for radially clamping the associated shaft 26, 28, 30 in order to retain axially and radially the needle 18 , 20, 22 on the shaft 26, 28, 30, and in order to make the shaft and the associated needle integral with rotation.
  • each elastic structure 34 is constituted by a fork which is connected to the inner wall 33 of the opening 32 by a material bridge 40 and which comprises two branches 42, 44 extending from and other material bridge 40, generally to the shaft 26, 28, 30.
  • each branch 42, 44 has a bearing surface 36, 38 in the vicinity of its free end 46, 48.
  • each resilient structure 34 is bent towards each other forming a "C" almost closed.
  • Each branch 42, 44 of each elastic structure 34 is in the form of a substantially parabolic curve of which a fixed first end 50, 52 is arranged on the associated material bridge 40 and a second free end 46, 48 faces the free end 46, 48 of the other leg 42, 44 of the elastic structure 34.
  • the free ends 46, 48 of the branches 42, 44 of each elastic structure 34 are sufficiently close so that the inner face of each leg 42, 44 is substantially tangential to the axial surface of the shaft 26, in the vicinity of the free ends 46, 48, the bearing surface 36, 38 of each leg 42, 44 thus being situated on the inner face of its free end section, opposite the shaft 26.
  • the elastic structures 34 are evenly distributed around the axis A1.
  • the number of elastic structures 34 arranged around the opening 32 is chosen as a function of the diameter of the associated shaft 26, 28, 30 and as a function of the available radial space between the inner wall 33 of the opening 32 and the outer wall 54 of the fixing ring 31 of the needle 18, 20, 22.
  • the diameter of the shaft 26 associated with the hour hand 18 is much larger than the diameter of the shaft 30 associated with the second hand 22, and as the diameter outside the fixing ring 31 does not evolve proportionally, it was selected a number of elastic structures 34 equal to twelve for the hour hand 18 while the number of elastic structures 34 is equal to three for the needle of the Secondly, the number of elastic structures 34 in the minute hand 20 is here equal to six.
  • each elastic structure 34 comprises a main section 56 which extends on each side of the material bridge 40.
  • Each branch 42, 44 extends from the end of the main section 56 opposite the material bridge 40, in a rectilinear direction.
  • Each branch 42, 44 is inclined towards the branch 42, 44 associated, with respect to a radial direction.
  • the surface 36, 38 of each branch 42, 44 is arranged at the free end 46, 48 of the branch 42, 44.
  • each elastic structure 34 extends in a substantially circumferential direction, parallel to the cylindrical inner wall 33 of the opening 32, which makes it possible to maximize the length of the main section 56 and the branches 42, 44 straight to distribute the stresses related to the elastic deformation of the branches 42, 44 in a larger volume.
  • the second embodiment has the advantage of producing a self-locking effect, when the shaft 26, 28, 30 and the associated needle 18, 20, 22 are assembled together. Indeed, the inclination of the branches 42, 44 allows a dynamic reaction to an acceleration in rotation, which makes this embodiment particularly suitable for fixing assembly elements supporting high angular accelerations or in the case where the rotating element has a significant imbalance in the distribution of masses, which is the case for the needles of a timepiece.
  • each elastic structure 34 exert thrust forces in opposite directions, so that each leg 42, 44 opposes the relative rotation of the needle 18, 20, 22 relative to the shaft 26, 28, 30 associated in a preferred direction of rotation.
  • first limb 42 of each elastic structure 34 opposes the relative rotation of the needle 18 in the counter-clockwise direction and the second leg 44 of each elastic structure 34 opposes the relative rotation of the needle 18 clockwise.
  • the elastic structures 34 of the second embodiment thus provide a particularly effective rotational connection between the needles 18, 20, 22 and the associated shafts 26, 28, 30.
  • fork-shaped elastic structures 34 having a tangentially or circumferentially oriented section (the section 56) and a rectilinear section (the branch 42, 44) oriented towards the associated shaft 26, 28, 30 makes it possible to reduce the stiffness of the elastic structure 34 which allows a radial clearance of sufficient value to allow attachment to the shaft 26, 28, 30, in particular to compensate for the diameter tolerances of the shaft.
  • Each elastic structure 34 must have sufficient flexibility to allow attachment both to a shaft having a diameter smaller than the nominal value and to a shaft having a diameter greater than the nominal value.
  • the advantages mentioned here with reference to the second embodiment apply in part to the first embodiment, the realization of structures elastic members comprising two branches 42, 44 with the advantage of a dynamic reaction to an angular acceleration.
  • the branches 42, 44 curves of the first embodiment also make it possible to obtain a decrease in the stiffness of the elastic structure 34 and an adequate radial displacement for attachment to the shaft.
  • each elastic structure 34 has an axial plane of symmetry P which extends along a radius passing through the middle of the material bridge 40.
  • the connecting element may be constituted by another type of rotary element, for example by a toothed wheel used in a clockwork movement.
  • the connecting element may also be constituted by a non-rotating element, for example a plate of brittle material intended to be assembled on another element comprising a fixing shaft, or tenon, of metal.
  • the present invention is applicable to a needle 18, 20, 22 made in a silicon wafer comprising a single layer of silicon, as well as in a Silicon On Insulator (SOI) type wafer which comprises an upper layer and a lower layer of silicon separated by an intermediate layer of silicon oxide.
  • SOI Silicon On Insulator

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Micromachines (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)

Claims (9)

  1. Fügeelement (18, 20, 22), das in einer Werkstoffplatte, die keinen verwendbaren Plastikbereich besitzt, ausgeführt ist, umfassend eine Öffnung (32), die für die axiale Einfügung einer Kreisquerschnittwelle (26, 28, 30) vorgesehen ist, wobei die Innenwandung (33) der Öffnung (32) elastische Strukturen (34) umfasst, die in die Platte graviert sind und die jeweils wenigstens eine Auflagefläche (36, 38) umfassen, um die Welle (26, 28, 30) radial einzuklemmen, damit die Befestigung des Fügeelements (18, 20, 22) in Bezug auf die Welle (26, 28, 30) sichergestellt wird, wobei jede elastische Struktur (34) aus einer Gabel besteht, die durch eine Werkstoffbrücke (40) mit der Innenwandung (33) der Öffnung verbunden ist und die zwei Zweige (42, 44) umfasst, wobei sich diese Zweige beiderseits der Werkstoffbrücke (40) global zur Welle (26, 28, 30) hin erstrecken, dadurch gekennzeichnet, dass jeder Zweig (42, 44) nur eine Auflagefläche (36, 38) in der Nähe von seinem freien Ende (46, 48) umfasst.
  2. Fügeelement (18, 20, 22) nach vorhergehendem Anspruch, dadurch gekennzeichnet, dass jeder Zweig (42, 44) der elastischen Struktur (34) die Form einer merklich parabelförmigen Kurve aufweist, wovon ein erstes festes Ende (50, 52) auf der zugeordneten Werkstoffbrücke (40) angeordnet ist und wovon ein zweites freies Ende (46, 48) dem freien Ende (46, 48) des anderen Zweigs (42, 44) der elastischen Struktur (34) gegenüberliegt, und dass die Auflagefläche (36, 38) jedes Zweigs (42, 44) an der Innenseite seines freien Endabschnitts angeordnet ist.
  3. Fügeelement (18, 20, 22) nach Anspruch 1, dadurch gekennzeichnet, dass jede elastische Struktur (34) einen Hauptabschnitt (56) umfasst, der sich beiderseits der Werkstoffbrücke (40) erstreckt, dass sich jeder Zweig (42, 44) ausgehend von dem der Werkstoffbrücke (40) entgegengesetzten Ende des Hauptabschnitts (56) gemäss einer geradlinigen Richtung erstreckt, die in Bezug auf eine radiale Richtung zum zugeordneten Zweig (42, 44) hin geneigt ist, und dass die Auflagefläche (36, 38) jedes Zweigs (42, 44) an seinem freien Ende (46, 48) angeordnet ist.
  4. Fügeelement (18, 20, 22) nach vorhergehendem Anspruch, dadurch gekennzeichnet, dass sich der Hauptabschnitt (56) gemäss einer merklich kreislinienförmigen Richtung erstreckt.
  5. Fügeelement (18, 20, 22) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Innenwandung (33) der Öffnung (32) wenigstens drei elastische Strukturen (34) umfasst, die derart angeordnet sind, dass sie regelmässig um die Welle (26, 28, 30) herum verteilt sind.
  6. Fügeelement (18, 20, 22) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es aus einem drehbaren Element (18, 20, 22) besteht, das vorgesehen ist, um drehungsfest auf der Welle (26, 28, 30) montiert zu werden.
  7. Fügeelement (18, 20, 22) nach vorhergehendem Anspruch, dadurch gekennzeichnet, dass es aus einem Uhrzeiger (18, 20, 22) besteht.
  8. Fügeelement (18, 20, 22) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Platte auf Silizium-Basis ist.
  9. Zeitmessgerät (10), dadurch gekennzeichnet, dass es ein Fügeelement (18, 20, 22) nach einem der vorhergehenden Ansprüche umfasst.
EP06123783A 2006-11-09 2006-11-09 Montageelement, das dehnbare Strukturen in Form von Gabeln umfasst, und dieses Element umfassende Uhr Active EP1921517B1 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP06123783A EP1921517B1 (de) 2006-11-09 2006-11-09 Montageelement, das dehnbare Strukturen in Form von Gabeln umfasst, und dieses Element umfassende Uhr
DE602006014280T DE602006014280D1 (de) 2006-11-09 2006-11-09 Montageelement, das dehnbare Strukturen in Form von Gabeln umfasst, und dieses Element umfassende Uhr
AT06123783T ATE467860T1 (de) 2006-11-09 2006-11-09 Montageelement, das dehnbare strukturen in form von gabeln umfasst, und dieses element umfassende uhr
SG200717510-2A SG143145A1 (en) 2006-11-09 2007-11-05 Assembly element including fork shaped elastic structures and timepiece including the same
KR1020070112991A KR101245905B1 (ko) 2006-11-09 2007-11-07 포크 형태의 탄성 구조물을 포함하는 조립체 요소 및 이를포함하는 시계
CN2007101999408A CN101183238B (zh) 2006-11-09 2007-11-08 包括叉形弹性结构的组件和包括该组件的计时器
US11/937,696 US7572050B2 (en) 2006-11-09 2007-11-09 Assembly element including fork shaped elastic structures and timepiece including the same
JP2007291856A JP5175523B2 (ja) 2006-11-09 2007-11-09 フォーク形状弾性構造体を備える組立要素およびそれを備える時計
HK08112399.4A HK1120872A1 (en) 2006-11-09 2008-11-12 Assembly element including fork shaped elastic structures and timepiece including the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06123783A EP1921517B1 (de) 2006-11-09 2006-11-09 Montageelement, das dehnbare Strukturen in Form von Gabeln umfasst, und dieses Element umfassende Uhr

Publications (2)

Publication Number Publication Date
EP1921517A1 EP1921517A1 (de) 2008-05-14
EP1921517B1 true EP1921517B1 (de) 2010-05-12

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EP06123783A Active EP1921517B1 (de) 2006-11-09 2006-11-09 Montageelement, das dehnbare Strukturen in Form von Gabeln umfasst, und dieses Element umfassende Uhr

Country Status (9)

Country Link
US (1) US7572050B2 (de)
EP (1) EP1921517B1 (de)
JP (1) JP5175523B2 (de)
KR (1) KR101245905B1 (de)
CN (1) CN101183238B (de)
AT (1) ATE467860T1 (de)
DE (1) DE602006014280D1 (de)
HK (1) HK1120872A1 (de)
SG (1) SG143145A1 (de)

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Also Published As

Publication number Publication date
ATE467860T1 (de) 2010-05-15
CN101183238A (zh) 2008-05-21
SG143145A1 (en) 2008-06-27
KR101245905B1 (ko) 2013-03-20
KR20080042700A (ko) 2008-05-15
US20080112274A1 (en) 2008-05-15
CN101183238B (zh) 2011-12-14
JP5175523B2 (ja) 2013-04-03
EP1921517A1 (de) 2008-05-14
JP2008122385A (ja) 2008-05-29
DE602006014280D1 (de) 2010-06-24
HK1120872A1 (en) 2009-04-09
US7572050B2 (en) 2009-08-11

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