EP3867706A1 - Aiguille indicatrice de secondes ou de fractions de seconde pour piece d'horlogerie - Google Patents
Aiguille indicatrice de secondes ou de fractions de seconde pour piece d'horlogerieInfo
- Publication number
- EP3867706A1 EP3867706A1 EP19790083.0A EP19790083A EP3867706A1 EP 3867706 A1 EP3867706 A1 EP 3867706A1 EP 19790083 A EP19790083 A EP 19790083A EP 3867706 A1 EP3867706 A1 EP 3867706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- rod
- needle according
- indicator needle
- timepiece
- 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.)
- Granted
Links
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
Definitions
- the present invention relates to a second or fractional seconds indicator hand for a timepiece and a timepiece, in particular a mechanical timepiece, provided with such a hand.
- the indicator needles are generally made of brass, steel, gold, aluminum or alloy. Most of these materials have a high density which translates, for the needle, by a large mass therefore a great inertia. A high inertia needle consumes more energy from its drive mechanism. This is problematic in the case of second hands or fractions of a second because of their high speed of rotation. In particular, when a chronograph is triggered, the rotation of the chronograph second hand and any fractional second hands contributes to creating a peak in energy consumption which causes a loss of amplitude at the level of the oscillator and consequently a reduction in the power reserve and chronometry. It is therefore important that these needles are light.
- patent application WO 2006/122873 proposes to produce them in a crystalline material based on silicon and to use for this purpose etching techniques from the field of microelectronics.
- the forms obtainable by such techniques are however limited so that it is difficult to optimize the lightness of the needle without penalizing the aesthetics.
- Transparent plastic or glass needles are described in documents FR 2867285, DE 29604580 U and DE 822293 but the objective sought in these documents is quite different from that of reducing the inertia of the needles.
- the present invention aims to solve, at least in part, the abovementioned problems and proposes for this purpose a second or fractional seconds indicator hand for a timepiece comprising a fixing part intended to be mounted on an axis and a rod made of glass or sapphire extending from the fixing part, characterized in that on at least one section of the strip the upper surface of the strip is faceted or has, in cross section, a domed or semi-oblong shape.
- FIG. 1 is a top view of a seconds hand or fractions of a second for a timepiece according to a particular embodiment of the invention
- FIG. 2 is a partial longitudinal sectional view of the needle, taken along the line A-A of Figure 1;
- FIG. 3 is a cross-sectional view of the rod of the needle, taken along line B-B of Figure 1;
- FIG. 4 to 7 are cross-sectional views of needle rods according to other embodiments of the invention.
- FIG. 8 to 12 show the shape of the cross section of needle rods according to yet other embodiments of the invention.
- Figures 1 and 2 show an indicator hand 1 for a timepiece, in particular for a wristwatch, pocket watch or pendulum clock, according to a particular embodiment of the invention.
- Hand 1 is a hand indicating seconds or fractions of a second. In the case of a second hand, it can be that of an ordinary watch or a chronograph. It can also be a split-second needle.
- the timepiece is typically mechanical.
- the needle 1 comprises a fixing part 10 pierced with a hole 11 allowing the assembly of the needle by driving out, gluing, brazing or the like on an axis. From the fixing part 10 extends radially a rod 12 intended to point towards the numbers and / or index of a graduation of the dial of the timepiece.
- the needle 1 may further comprise a counterweight 15 extending from the fixing part 10 in the opposite direction to the rod 12.
- the rod 12 and preferably the entire needle 1 is made of mineral or organic glass, preferably of tempered mineral glass, or of sapphire. These materials have a low density, allowing the needle to be light and therefore to have low inertia, and also have sufficient rigidity to prevent the needle from deforming under the effect of its weight.
- the upper surface 17 of the rod 12 that is to say the surface seen by the user when he looks at the dial from above (or from the front), is faceted by two longitudinal chamfers opposite 17a, 17b (see Figure 3) or has, in cross section, a curved shape therefore without edge (see Figure 4) or a semi-oblong shape (straight segment with curved ends; see Figure 5).
- the interior of the rod 12 is hollowed out. More specifically, a groove 20 is formed in the lower surface 18 of the rod 12 over a depth which typically exceeds the half the height h of the strip 12 and over a length which is at least 50%, preferably at least 75% of the length L of the strip 12. This gives minimal inertia for the needle 1 without deviating from the usual aesthetics of a needle.
- the bottom 20a of the groove 20 is preferably rounded, as shown, to increase the rigidity.
- the groove 20 is replaced by a recess 21 formed inside the rod 12 and which does not open either on the lower surface 18 or on the others outer surfaces of the rod 12, this over all or almost the entire length of the recess 21, or over at least 50% or even at least 75% of the length of the recess 21.
- This recess 21 can on another part of its length communicate with the outside of the strip 12 through one or more holes left during manufacture.
- the cross section of the strip 12 can have different shapes from the semi-octagonal, semi-circular or oblong shapes illustrated in Figures 3 to 5 respectively.
- Figures 8 to 11 show additional examples of cross-sectional shapes for the strip 12 where the upper surface is faceted ( Figures 8 and 9: semi-hexagonal shape; Figure 10: triangular shape; Figure 11: hexagonal shape).
- Figure 12 shows a circular cross section giving the upper surface a domed shape.
- the needle according to the invention is typically manufactured by 3D printing or by the technique known under the name of FEMTOPRINT (registered trademark) which consists in locally changing the properties of a transparent material such as glass or sapphire by means of a femtosecond laser and then subjecting the transparent material to a chemical etching operation aimed at eliminating the parts treated by the laser.
- FEMTOPRINT registered trademark
- the FEMTOPRINT process makes it possible to obtain one-piece parts of complex shapes, including interior recesses, chamfers, rounding, etc., with great manufacturing precision.
- the freedom in the choice of shapes is much greater than with an anisotropic etching process like deep reactive ion etching called DRIE.
- the outer surface of the needle according to the invention can be treated and / or wear one or more coatings.
- at least a first section of the transparent strip 12 can carry an anti-reflective coating 16 over its entire surface or at least on its upper and / or lower surface and a second section of the strip 12, typically a part of distal end, constituting the indicator portion of the needle, can be made opaque or less transparent than the first section at least for a user looking at the needle from above.
- the first section can thus facilitate the reading of information on the dial above which the hand moves.
- the second section can be made opaque or less transparent by the deposition of a layer 19 such as a layer of paint or a metallic layer or by a treatment such as texturing or frosting.
- all of the rod 12 or all of the needle 1 can be treated, for example textured, frosted or painted, to be clearly visible.
- an intermediate piece for example made of brass, can be brazed or fixed elastically in the hole 11 and then driven out on the axis.
- the width e of the strip 12 can be variable, as shown in FIG. 1 where the strip 12 is tapered, in order to better distribute the stresses and in particular increase its stiffness where the forces are the highest, namely near the part fixing 10.
- the height h of the strip 12 can be variable and can for example decrease from its end joined to the fixing part 10 at its free end, for a better distribution of the stresses.
- the needle according to the invention can also have a non-rectilinear profile, of curved shape or with recesses, for example to follow a curvature of the dial or pass over the barrel of another needle or another three-dimensional member while keeping the indicator portion of the needle close to the dial.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromechanical Clocks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18201140.3A EP3640745B1 (fr) | 2018-10-18 | 2018-10-18 | Aiguille indicatrice pour piece d'horlogerie |
| PCT/IB2019/058857 WO2020079633A1 (fr) | 2018-10-18 | 2019-10-17 | Aiguille indicatrice de secondes ou de fractions de seconde pour piece d'horlogerie |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3867706A1 true EP3867706A1 (fr) | 2021-08-25 |
| EP3867706B1 EP3867706B1 (fr) | 2025-06-11 |
Family
ID=63914824
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18201140.3A Active EP3640745B1 (fr) | 2018-10-18 | 2018-10-18 | Aiguille indicatrice pour piece d'horlogerie |
| EP22203199.9A Pending EP4145229A1 (fr) | 2018-10-18 | 2018-10-18 | Aiguille indicatrice pour pièce d'horlogerie |
| EP19790083.0A Active EP3867706B1 (fr) | 2018-10-18 | 2019-10-17 | Aiguille indicatrice de secondes ou de fractions de seconde pour piece d'horlogerie |
| EP19790085.5A Active EP3867707B1 (fr) | 2018-10-18 | 2019-10-17 | Aiguille indicatrice pour piece d'horlogerie |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18201140.3A Active EP3640745B1 (fr) | 2018-10-18 | 2018-10-18 | Aiguille indicatrice pour piece d'horlogerie |
| EP22203199.9A Pending EP4145229A1 (fr) | 2018-10-18 | 2018-10-18 | Aiguille indicatrice pour pièce d'horlogerie |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19790085.5A Active EP3867707B1 (fr) | 2018-10-18 | 2019-10-17 | Aiguille indicatrice pour piece d'horlogerie |
Country Status (2)
| Country | Link |
|---|---|
| EP (4) | EP3640745B1 (fr) |
| WO (2) | WO2020079636A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023036977A1 (fr) * | 2021-09-13 | 2023-03-16 | Maturitas As | Système d'aiguilles de montre amélioré offrant une meilleure lisibilité d'informations affichées sur différents emplacements d'un cadran de montre |
| NO20211096A1 (fr) * | 2021-09-13 | 2023-03-14 | ||
| EP4300214A1 (fr) * | 2022-06-28 | 2024-01-03 | The Swatch Group Research and Development Ltd | Procede de fabrication d'une aiguille d'horlogerie de section circulaire |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE822293C (de) * | 1949-07-16 | 1951-11-26 | Uhrenfabriken Gebrueder Jungha | Zeiger fuer Zeitmesser u. dgl. |
| CH682966B5 (fr) * | 1992-02-10 | 1994-06-30 | Gerald Genta | Aiguille pour pièce d'horlogerie. |
| DE29604580U1 (de) * | 1996-03-12 | 1997-05-15 | Liauw, Ek Tjien, 60323 Frankfurt | Kalender-Uhr mit 3 Zeigern, die durch 3 Ringe am Ende die Datumsziffer, den Monat und den Tag zeigen; das Zifferblatt ist in 3 Kreisen eingeteilt für Tag, Monat, Datum |
| JP4481564B2 (ja) * | 2001-12-13 | 2010-06-16 | アスラブ・エス アー | 特に時計の発光針およびそれを備えた表示装置 |
| FR2867285B1 (fr) * | 2004-03-03 | 2009-07-31 | Benoit Espiau | Montre |
| EP1722281A1 (fr) | 2005-05-12 | 2006-11-15 | ETA SA Manufacture Horlogère Suisse | Organe d'affichage analogique en matériau cristallin, pièce d'horlogerie pourvue d'un tel organe d'affichage, et procédé pour sa fabrication |
| CH707437B1 (fr) * | 2013-01-10 | 2017-12-29 | Richemont Int Sa | Procédé optique pour rendre invisible au moins un composant d'un mouvement de montre. |
-
2018
- 2018-10-18 EP EP18201140.3A patent/EP3640745B1/fr active Active
- 2018-10-18 EP EP22203199.9A patent/EP4145229A1/fr active Pending
-
2019
- 2019-10-17 EP EP19790083.0A patent/EP3867706B1/fr active Active
- 2019-10-17 WO PCT/IB2019/058860 patent/WO2020079636A1/fr not_active Ceased
- 2019-10-17 WO PCT/IB2019/058857 patent/WO2020079633A1/fr not_active Ceased
- 2019-10-17 EP EP19790085.5A patent/EP3867707B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3640745A1 (fr) | 2020-04-22 |
| WO2020079636A1 (fr) | 2020-04-23 |
| WO2020079633A1 (fr) | 2020-04-23 |
| EP4145229A1 (fr) | 2023-03-08 |
| EP3867706B1 (fr) | 2025-06-11 |
| EP3640745B1 (fr) | 2023-02-22 |
| EP3867707B1 (fr) | 2022-11-02 |
| EP3867707A1 (fr) | 2021-08-25 |
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