EP0948758B1 - Uhrenglas sowie verfahren zu dessen herstellung - Google Patents

Uhrenglas sowie verfahren zu dessen herstellung Download PDF

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Publication number
EP0948758B1
EP0948758B1 EP97938739A EP97938739A EP0948758B1 EP 0948758 B1 EP0948758 B1 EP 0948758B1 EP 97938739 A EP97938739 A EP 97938739A EP 97938739 A EP97938739 A EP 97938739A EP 0948758 B1 EP0948758 B1 EP 0948758B1
Authority
EP
European Patent Office
Prior art keywords
axis
circle
glass according
glass
lateral faces
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.)
Expired - Lifetime
Application number
EP97938739A
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English (en)
French (fr)
Other versions
EP0948758A1 (de
Inventor
Hansruedi Sägesser
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.)
Hans Stettler AG
Original Assignee
Hans Stettler AG
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 Hans Stettler AG filed Critical Hans Stettler AG
Publication of EP0948758A1 publication Critical patent/EP0948758A1/de
Application granted granted Critical
Publication of EP0948758B1 publication Critical patent/EP0948758B1/de
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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/004—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass
    • G04B39/006—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass out of wear resistant material, e.g. sapphire
    • 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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses

Definitions

  • the present invention relates to a watch crystal, one of the main faces of which is curved, as described in document FR 2 386 851, the glass being formed from a cut stone in the shape of a cabochon.
  • Such glasses are used to give a particular cachet to a watch.
  • the curved face is a surface of revolution, for example spherical.
  • the edge of the glass has, under these conditions, a constant thickness.
  • the face curved is generally a cylindrical surface.
  • the generator of the cylindrical part is oriented perpendicular to the long side of the ice. If the thickness of the edges of the short sides is then constant, on the other hand that of the long sides varies all the more as the ice is long. This drawback is mitigated if the curved face is a spherical shape. It may even be completely eliminated by giving the ice the desired shape by hot molding a plate of constant thickness. Or, if the part of the watch case on which the ice also has a cylindrical shape, the two faces of the ice are then two surfaces parallel cylindrical, and the thickness everywhere constant.
  • the first solution leads however on faces which are not perfectly regular, defect sufficiently visible to keep these watches out of neat quality watches.
  • the second solution has the disadvantage of increasing the manufacturing price of the box and ice.
  • the purpose of the present invention is to provide a corundum ice cream, of elongated shape, in particular rectangular, in which the curved face is a surface which makes it possible to obtain an edge whose thickness is significantly smaller and more constant than in the case windows whose curved face is cylindrical or spherical, for the same thickness of the ice in its center.
  • the watch crystal according to the invention comprising a domed upper surface and a lower surface, is mainly remarkable for its characteristics appearing in the characterizing part of claim 1.
  • a surface toroidal Such a surface is generated, as shown in Figure 1, by a circle 1 of radius R1, the center C1 of which describes a circle 2 of center C2 and of radius r2.
  • the plane of circle 1 is perpendicular to the plane of circle 2, and it passes through its center C2.
  • the ice In the raw state, the ice is in the form of a transparent plate, preferably in spinel, in corundum, sapphire or ruby, elongated, by rectangular example, and whose main faces are flat and parallel.
  • the reference 10 designates a circular drum which is fixed on a shaft not shown of the machine so as to be rotated, in the direction of arrow F, around its axis of symmetry xx '.
  • the drum has at its periphery flat areas 11 parallel to the axis xx ', and on each track is glued, equidistant from the faces of the drum, a ice 12.
  • the long side of the ice is oriented perpendicular to the axis xx ', but its orientation might as well be parallel to this axis.
  • a grinding wheel 13 In the extension of the drum 10 is disposed a grinding wheel 13 on a carriage not shown, and it is driven in rotation, in the direction of arrow F ', around its axis yy' by a motor shaft on which it is fixed.
  • the cart is integral with the machine frame while being driven by this in an alternative pivoting movement, in the direction of arrow f, around an axis ZZ 'arranged perpendicular to the axis xx 'and passing through the middle of the drum 10.
  • the grinding wheel 13 is mounted on a slide, integral with the carriage, allowing it to be moved according to the arrow f 'so as to modify its distance to the axis ZZ', manually or by machine, and get it to touch the ice 12 at a point of contact 14.
  • the contact point 14 therefore describes well in relation to the drum 10, when it rotates around the axis xx ', a surface toroidal.
  • the radius of the drum 10 and the thickness of the glass 12 determine the radius R2, and the position of the axis ZZ 'by compared to C2, the radius R1.
  • the drum 10 and grinding wheel 13 are rotated, this causing the pivoting movement of the carriage around the axis ZZ ', along arrow f, the grinding wheel being distant from the glass 12. Then the grinding wheel 13 is approached the axis ZZ ' following the arrow f 'to come into contact with the glass 12 and machine its surface until the nominal values of R1 and R2 are reached. All of these operations can be performed automatically.
  • ice 12 of rectangular shape thus obtained is shown in fig. 3.
  • This ice is bounded by a flat underside 20 coming opposite the dial one when fixed on a watch, a domed upper face 21, and four flat side faces, the faces 22 corresponding to the short sides of the rectangle, and the sides 23 to the long sides.
  • the lower face 20 may advantageously have a recess 24 for the needles, obtained by grinding or by ultrasonic machining and preserving a flat edge 25 on everything around the ice.
  • Lines 26 and 26 give the contour of the upper face 21, and therefore the thickness of the glass with respect to the underside 20 when the glass is cut by planes parallel to the lateral faces and passing through its center
  • line 27 gives the upper outline of small side faces 22, and line 28 that of large lateral faces 23.
  • line 29 indicates the shape, in arc of circle, that would have the upper edge of the small faces side 22, for the same thickness of the glass in the center, if the upper face had a spherical shape
  • the line 30 the shape of the upper edge of the large lateral faces 23.
  • the watch glass which has just been described may undergo other modifications and appear under other variants, obvious to a person skilled in the art, without depart from the scope of the present invention as defined by the revendications.
  • the ice could have a elongated shape different from that of a rectangle, as by example an oval shape, and the underside deviate from the flat shape.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Surface Treatment Of Glass (AREA)

Claims (8)

  1. Uhrenglas (12) mit einer gewölbten Oberseite (21) und einer Unterseite (20), dadurch gekennzeichnet, dass es eine insgesamt rechteckige, durch Seitenflächen (22, 23) definierte Form aufweist und die Oberseite sich der Form eines Segmentes eines Torus anpasst, der von einem ersten, um eine Achse (x-x') drehenden Erzeugerkreis (1) mit einem Radius R1 definiert wird, wobei das Zentrum (C1) des ersten Kreises einen zweiten Kreis (2) mit einem Radius r2 beschreibt und das Segment einem Teil (3) der torischen Fläche entspricht, der durch einen Schnitt durch diese Fläche durch eine senkrecht zur Ebene mit dem zweiten Kreis (2) verlaufende Ebene erzielt wird und dessen Abstand zum Zentrum des zweiten Kreises (2) zwischen r2 und R1+r2 liegt.
  2. Glas nach Anspruch 1, dadurch gekennzeichnet, dass die Seitenflächen (22, 23) eben sind.
  3. Glas nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass das Verhältnis zwischen der Länge der großen Seitenflächen (23) und der Länge der kleinen Seitenflächen (22) nahezu gleich R1/(R1+r2) ist.
  4. Glas nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Unterseite (20) eben ist.
  5. Glas nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Unterseite eine Aussparung (24) aufweist.
  6. Glas nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass es aus einem harten und optisch durchsichtigen Material wie Spinell, Korund, Saphir oder Rubin besteht.
  7. Verfahren zur Herstellung eines Uhrenglases nach einem der Ansprüche 1 bis 6 mit Hilfe einer Schleifmaschine mit
    einem Gestell,
    einer um eine erste Achse (xx') drehbar gelagerten Trommel (10), deren Umfang mit ebenen, parallel zur ersten Achse (xx') verlaufenden Bereichen (11 ) versehen ist,
    einem in der Verlängerung der Trommel angeordneten und um eine zweite Achse (yy') drehangetriebenen Schleifkörper (13),
    einem Schlitten für den Schleifkörper (13), welcher auf dem Gestell um eine dritte Achse (ZZ') schwenkbar gelagert ist,
    dadurch gekennzeichnet, dass die dritte Achse (ZZ') senkrecht zur ersten Achse (xx') verläuft und von dieser um einen Wert r2 beabstandet ist, und dass das Uhrenglas auf einem der Bereiche in gleichem Abstand zu den Flächen der Trommel (10) platziert ist.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die großen Seitenflächen (23) senkrecht zur ersten Achse (xx') angeordnet sind.
EP97938739A 1996-10-04 1997-09-18 Uhrenglas sowie verfahren zu dessen herstellung Expired - Lifetime EP0948758B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH241996 1996-10-04
CH02419/96A CH690873A5 (fr) 1996-10-04 1996-10-04 Glace de montre.
PCT/CH1997/000352 WO1998015876A1 (fr) 1996-10-04 1997-09-18 Glace de montre

Publications (2)

Publication Number Publication Date
EP0948758A1 EP0948758A1 (de) 1999-10-13
EP0948758B1 true EP0948758B1 (de) 2003-12-10

Family

ID=4233372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97938739A Expired - Lifetime EP0948758B1 (de) 1996-10-04 1997-09-18 Uhrenglas sowie verfahren zu dessen herstellung

Country Status (5)

Country Link
EP (1) EP0948758B1 (de)
JP (1) JP3892910B2 (de)
CH (1) CH690873A5 (de)
DE (1) DE69726755T2 (de)
WO (1) WO1998015876A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2228694A1 (de) 2009-03-12 2010-09-15 Stettler Sapphire AG Verfahren und Vorrichtung zum Schleifen von Uhrengläsern

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645919B1 (de) * 2004-10-11 2007-12-19 Fuji Crystal Manufactory Ltd. Gewölbtes Uhrglas
EP2500134A1 (de) * 2011-03-16 2012-09-19 Comadur S.A. Verkleidungsteil für eine Uhr, und sein Herstellungsverfahren
EP2500135A1 (de) * 2011-03-16 2012-09-19 Comadur S.A. Poliersystem für ein Verkleidungsteil einer Uhr

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1498833U (de) * 1940-09-09 1941-03-13
FR2386851A1 (fr) * 1977-04-07 1978-11-03 Suchet Edmond Presentation d'une information d'heure par systeme indicateur statique ou electro-optique a travers une pierre precieuse, fine ou decorative
GB2096789B (en) * 1981-03-03 1985-03-13 Canon Kk Optical mechanical scanning system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2228694A1 (de) 2009-03-12 2010-09-15 Stettler Sapphire AG Verfahren und Vorrichtung zum Schleifen von Uhrengläsern
WO2010102909A1 (de) 2009-03-12 2010-09-16 Stettler Sapphire Ag Verfahren und vorrichtung zum schleifen von uhrengläsern

Also Published As

Publication number Publication date
HK1019937A1 (en) 2000-03-03
CH690873A5 (fr) 2001-02-15
DE69726755D1 (de) 2004-01-22
WO1998015876A1 (fr) 1998-04-16
EP0948758A1 (de) 1999-10-13
JP2001503139A (ja) 2001-03-06
JP3892910B2 (ja) 2007-03-14
DE69726755T2 (de) 2004-09-23

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