WO1998015876A1 - Glace de montre - Google Patents
Glace de montre Download PDFInfo
- Publication number
- WO1998015876A1 WO1998015876A1 PCT/CH1997/000352 CH9700352W WO9815876A1 WO 1998015876 A1 WO1998015876 A1 WO 1998015876A1 CH 9700352 W CH9700352 W CH 9700352W WO 9815876 A1 WO9815876 A1 WO 9815876A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- face
- shape
- axis
- faces
- Prior art date
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
- 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.
- 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 a constant thickness under these conditions.
- the curved face is generally a cylindrical surface.
- the generator of the cylindrical part is oriented perpendicular to the long side of the glass. 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 the longer the ice. This drawback is mitigated if the curved face has a spherical shape. It can 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 crystal is applied also has a cylindrical shape, the two faces of the crystal are then two parallel cylindrical surfaces, and the thickness everywhere constant.
- the first solution leads to faces which are not perfectly regular, a defect sufficiently visible to remove these glasses from neat quality watches.
- the second solution has the disadvantage of increasing the manufacturing price of the box and the ice cream.
- the object of the present invention is to provide a glass of corundum, 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 substantially smaller and more constant than in the case of windows with the curved face is cylindrical or spherical for the same thickness of the window in its center.
- the crystal according to the invention of elongated shape and delimited by a substantially planar lower main face intended to come opposite the dial of a watch, and a domed upper face, is mainly remarkable in that the upper face is a toroidal surface.
- - fig. 1 is a geometric construction showing how a toroidal surface is defined
- - fig. 2 is a schematic view of a machine for grinding a toroidal surface
- - fig. 3 shows in plan, front and side views a rectangular shaped window according to the invention.
- a toroidal surface Such a surface is generated, as shown in FIG. 1, by a circle 1 of radius RI, the center Cl 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 the ent in spinel, in corundum, in sapphire or in ruby, of elongated shape, for example rectangular, 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 driven in rotation, in the direction of the arrow F, about its axis of symmetry xx '.
- the drum has at its periphery flat areas 11 parallel to the axis xx ', and on each area is bonded, equidistant from the faces of the drum, a glass 12.
- the long side of the glass is oriented perpendicularly to the axis xx ', but its orientation could just as easily 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 rotated, in the direction of the arrow F ', around its axis yy' by a drive shaft on which it is fixed.
- the cart is integral with the frame of the machine while being driven by the latter in an alternating pivoting movement, in the direction of arrow f, about an axis ZZ 1 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, making it possible to move it along the arrow f so as to modify its distance from the axis ZZ ', manually or by the machine, and cause it to touch the glass 12 at a contact point 14.
- the contact point 14 therefore describes well with respect to the drum 10, when it rotates around the axis xx ', a toroidal surface.
- the radius of the drum 10 and the thickness of the glass 12 determine the radius R2, and the position of the axis ZZ 'relative to C2, the radius RI.
- the drum 10 and the 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 from axis ZZ' along arrow f to come into contact with ice 12 and machine its surface until the nominal values of RI and R2 are reached. All of these operations can be performed automatically.
- FIG. 3 An example of glass 12 of rectangular shape thus obtained is shown in FIG. 3.
- This crystal is delimited by a flat lower face 20 facing the dial when fixed on a watch, a domed upper face 21, and four flat lateral faces, the faces 22 corresponding to the short sides of the rectangle, and the faces 23 on the long sides.
- the lower face 20 may advantageously have a recess 24 for the needles, obtained by eulage or by machining by ultrasound and preserving a planar edge 25 over the entire periphery of the ice.
- the lines 26 and 26 give the contour of the upper face 21, and therefore the thickness of the glass relative to the lower face 20 when the glass is cut by planes parallel to the lateral faces and passing through its center, the line 27 gives the upper contour of the small lateral faces 22, and the line 28 that of the large lateral faces 23. Finally the line 29 indicates the shape, in an arc of a circle, that the upper edge of the small lateral faces 22 would have, for the same thickness of the glass in the center, if the upper face had a spherical shape, and the line 30 the shape of the upper edge of the large side faces 23. It can be seen that the thickness of the side faces of the glass according to the invention is more regular and well below that of known domed ice.
- the watch glass which has just been described can undergo other modifications and come in other variants, obvious to the skilled person, without departing from the scope of the present invention as defined by the revendications.
- the glass could have an elongated shape different from that of a rectangle, such as for example an oval shape, and the underside deviate from the planar 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)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51704098A JP3892910B2 (ja) | 1996-10-04 | 1997-09-18 | 時計 |
EP97938739A EP0948758B1 (fr) | 1996-10-04 | 1997-09-18 | Glace de montre ainsi que son procede de fabrication |
DE69726755T DE69726755T2 (de) | 1996-10-04 | 1997-09-18 | Uhrenglas sowie verfahren zu dessen herstellung |
HK99104575A HK1019937A1 (en) | 1996-10-04 | 1999-10-15 | Watch crystal and method of fabricating the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH02419/96A CH690873A5 (fr) | 1996-10-04 | 1996-10-04 | Glace de montre. |
CH2419/96 | 1996-10-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998015876A1 true WO1998015876A1 (fr) | 1998-04-16 |
Family
ID=4233372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1997/000352 WO1998015876A1 (fr) | 1996-10-04 | 1997-09-18 | Glace de montre |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0948758B1 (fr) |
JP (1) | JP3892910B2 (fr) |
CH (1) | CH690873A5 (fr) |
DE (1) | DE69726755T2 (fr) |
HK (1) | HK1019937A1 (fr) |
WO (1) | WO1998015876A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1645919A1 (fr) * | 2004-10-11 | 2006-04-12 | Fuji Crystal Manufactory Ltd. | Glace de montre bombée |
EP2228694A1 (fr) * | 2009-03-12 | 2010-09-15 | Stettler Sapphire AG | Dispositif et procédé de ponçage de verres de montres |
EP2500134A1 (fr) * | 2011-03-16 | 2012-09-19 | Comadur S.A. | Pièce d'habillage pour une pièce d'horlogerie et son système de fabrication |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2500135A1 (fr) * | 2011-03-16 | 2012-09-19 | Comadur S.A. | Système de polissage d'une pièce d'habillage pour une pièce d'horlogerie |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1498833U (fr) * | 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 |
US4585296A (en) * | 1981-03-03 | 1986-04-29 | Canon Kabushiki Kaisha | Scanning optical system having a tilting correcting function |
-
1996
- 1996-10-04 CH CH02419/96A patent/CH690873A5/fr not_active IP Right Cessation
-
1997
- 1997-09-18 WO PCT/CH1997/000352 patent/WO1998015876A1/fr active IP Right Grant
- 1997-09-18 EP EP97938739A patent/EP0948758B1/fr not_active Expired - Lifetime
- 1997-09-18 DE DE69726755T patent/DE69726755T2/de not_active Expired - Lifetime
- 1997-09-18 JP JP51704098A patent/JP3892910B2/ja not_active Expired - Fee Related
-
1999
- 1999-10-15 HK HK99104575A patent/HK1019937A1/xx unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1498833U (fr) * | 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 |
US4585296A (en) * | 1981-03-03 | 1986-04-29 | Canon Kabushiki Kaisha | Scanning optical system having a tilting correcting function |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1645919A1 (fr) * | 2004-10-11 | 2006-04-12 | Fuji Crystal Manufactory Ltd. | Glace de montre bombée |
EP2228694A1 (fr) * | 2009-03-12 | 2010-09-15 | Stettler Sapphire AG | Dispositif et procédé de ponçage de verres de montres |
WO2010102909A1 (fr) * | 2009-03-12 | 2010-09-16 | Stettler Sapphire Ag | Procédé et dispositif pour polir des verres de montre |
EP2500134A1 (fr) * | 2011-03-16 | 2012-09-19 | Comadur S.A. | Pièce d'habillage pour une pièce d'horlogerie et son système de fabrication |
WO2012123214A1 (fr) * | 2011-03-16 | 2012-09-20 | Comadur S.A. | Pièce d'habillage pour une pièce d'horlogerie et son système de fabrication |
CN103442846A (zh) * | 2011-03-16 | 2013-12-11 | 柯马杜股份有限公司 | 用于钟表的外部部件和制造该外部部件的系统 |
US9372474B2 (en) | 2011-03-16 | 2016-06-21 | Comadur S.A. | External piece for a timepiece and system of manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
DE69726755D1 (de) | 2004-01-22 |
HK1019937A1 (en) | 2000-03-03 |
EP0948758A1 (fr) | 1999-10-13 |
CH690873A5 (fr) | 2001-02-15 |
JP3892910B2 (ja) | 2007-03-14 |
DE69726755T2 (de) | 2004-09-23 |
EP0948758B1 (fr) | 2003-12-10 |
JP2001503139A (ja) | 2001-03-06 |
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