EP0964318B1 - Bauteil aus Hartmaterial für eine Uhr - Google Patents

Bauteil aus Hartmaterial für eine Uhr Download PDF

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Publication number
EP0964318B1
EP0964318B1 EP98110407A EP98110407A EP0964318B1 EP 0964318 B1 EP0964318 B1 EP 0964318B1 EP 98110407 A EP98110407 A EP 98110407A EP 98110407 A EP98110407 A EP 98110407A EP 0964318 B1 EP0964318 B1 EP 0964318B1
Authority
EP
European Patent Office
Prior art keywords
wristwatch
crown
threading
hard material
component
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
EP98110407A
Other languages
English (en)
French (fr)
Other versions
EP0964318A1 (de
Inventor
Michael Bach
Christophe Guerry
Olivier Bucher
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.)
Comadur SA
Rado Uhren AG
Original Assignee
Comadur SA
Rado Uhren 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 Comadur SA, Rado Uhren AG filed Critical Comadur SA
Priority to EP98110407A priority Critical patent/EP0964318B1/de
Priority to DE69823484T priority patent/DE69823484T2/de
Publication of EP0964318A1 publication Critical patent/EP0964318A1/de
Application granted granted Critical
Publication of EP0964318B1 publication Critical patent/EP0964318B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/04—Rigidly-mounted keys, knobs or crowns
    • G04B3/041—Construction of crowns for rotating movement; connection with the winding stem; winding stems
    • 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
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases

Definitions

  • the present invention relates to a construction element made of hard material for a wristwatch and in particular a watch case middle, a winding crown or bracelet links made of a material having a Vickers hardness greater than or equal to 1100 HV.
  • Metals are very widely used to make dressing parts for wristwatches because of their very interesting properties: high mechanical resistance, high toughness, ease of implementation and machining, etc. Their hardness is, however, lower than that of ceramics, and experience has shown that the cladding parts of wristwatches are poorly resistant to scratches caused by certain very hard agents such as the silica contained in dust, marble or even sand. This therefore results in a relatively rapid deterioration in the aesthetic appearance of these types of parts.
  • these covering parts are currently made of hard metal, for example tungsten carbide, titanium carbonitride or even ceramic.
  • Patent CH 622,151 describes an example of a structure for assembling a case back to a watch case middle made of corundum.
  • the middle part comprises a plurality of housings obtained for example by ultrasonic machining, by grinding or by electroerosion. These housings have a flat bottom and a slightly frustoconical side face and open out into the underside of the middle part. Tapped plugs are fixed by gluing in the housing of the middle. Screws pass through openings in the bottom and engage in the plugs into which they are screwed. This assembly technique is also used to make ceramic winding crowns.
  • the dosage of the glue during its application in the housings is very difficult to control, given the relatively small bonding surface on which the plugs are glued.
  • the implementation of this assembly technique is all the more delicate as the dimensions are small.
  • the diameters of the plugs used are of the order of a few millimeters.
  • the main object of the present invention is therefore to remedy the drawbacks of the above-mentioned prior art, by providing a construction element of hard material for a wristwatch allowing assembly with other construction elements of the same type, which is reliable, simple and economical to implement.
  • the subject of the invention is a construction element made of hard material for a wristwatch, characterized in that it comprises a hole whose cylindrical wall has a thread which comes in one piece with said element.
  • the wristwatch 1 shown diagrammatically and partially in FIG. 1, comprises a box 2 conventionally formed by a middle part 4, a glass 6 and a base 8.
  • the watch 1 further comprises means for setting the hour 10 cooperating in a known manner with a clockwork movement housed in the box 1.
  • the means 10 include in particular a winding stem 12 topped with a winding crown 14.
  • the crown 14, which forms a building element of the wristwatch 1, is made of a hard material, that is to say of a material having a Vickers hardness greater than or equal to 1100.
  • the crown 14 can be made of "hard metal", “cermet” or even ceramic material.
  • hard metal is meant two-phase composite materials consisting of a metallic phase which coats hard particles such as tungsten carbide particles or the like.
  • ceramic is meant two-phase composite materials consisting of a metallic phase which coats hard particles such as particles of titanium carbonitride or the like.
  • ceramic material is meant
  • the crown 14 (FIG. 2) comprises a hole 16, the cylindrical wall of which comprises an internal thread 18 which comes integrally with the crown 14 and by which the latter is directly screwed onto the winding stem 12.
  • thread coming from material it is understood that the thread 18 is obtained without removing material by machining using any tool.
  • the diameter of the crown 14 is between approximately 2 and 5 mm and the diameter of the threaded hole 16 is between approximately 2 and 3 mm, the length of the thread 18 is between approximately 1 and 2.5 mm , the manufacturing tolerances of such parts for wristwatches being of the order of 2 to 3 hundredths of a millimeter.
  • the direct mechanical connection between the winding stem 12 and the crown 14 resists tensile forces of the order of 800 N (breakage of the winding stem 12) and more, whatever the environmental conditions while the mechanical bond bonded between a stopper and a crown withstands, on average, tensile forces of the order of 70 to 110 N under normal conditions, and decreases to 26 N in tropical climatic conditions .
  • a ceramic powder for example a stabilized zirconium oxide powder.
  • the powder used has an average particle size of the order of a micrometer, typically 0.5-1 micrometer.
  • the ceramic powder is then mixed with a binder, for example a polyvinyl alcohol.
  • a binder for example a polyvinyl alcohol.
  • the mixture obtained is homogenized and dried, for example in a conventional atomizer.
  • the granule obtained is sieved, typically at 300 micrometers.
  • the sieved granule is then injected into a mold having the configuration of the desired crown in order to form a blank thereof.
  • the mold comprises in particular a core having the shape of a cylindrical rod on which helical grooves have been dug to leave in relief a thread whose external shape corresponds to that of the desired threaded hole.
  • the mold and the core are of course dimensioned to take into account the shrinkage phenomenon which the crown will undergo during the subsequent sintering step.
  • the dimensions are typically 20 to 25% greater than the final dimensions of the crown.
  • the core is unscrewed and the crown is removed from the mold.
  • the binder is then removed by a conventional thermal process. After removing the binder, the crown is placed in a sintering oven in which it is heated between 1300 ° C and 1600 ° C for about an hour. The crown is removed from the oven and cooled. The crown is finally polished, for example using a diamond paste, so that it has attractive aesthetic characteristics.
  • the crown thus obtained can be directly screwed onto a winding stem having an appropriate thread.
  • FIG 3 there is shown a wristwatch equipped with another construction element according to the invention and in which the elements identical to those of Figures 1 and 2 have the same reference numerals.
  • the building element is constituted by the middle part 6 made of ceramic.
  • the middle part 6 comprises, according to the invention, several holes 16 whose cylindrical wall has an internal thread 18 which comes in one piece with the body of the middle part 6. These holes 16 open into the underside of the middle part 6 and receive directly screws 20 which pass through openings 22 in the base 8 to fix the latter to the middle part 6.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Adornments (AREA)
  • Ceramic Products (AREA)

Claims (7)

  1. Bauelement aus einem harten Werkstoff für eine Armbanduhr, das ein Loch aufweist, dadurch gekennzeichnet, dass die zylindrische Wand des Lochs ein Gewinde aufweist, das mit dem Element einteilig ausgebildet ist, und dass das Gewinde ohne Materialabtragung erhalten ist.
  2. Bauelement nach Anspruch 1, dadurch gekennzeichnet, dass es einen Kronenaufzug, ein Uhrengehäuse oder ein Armbandelement bildet.
  3. Bauelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass es eine Härte besitzt, die größer oder gleich 1100 Vickers ist.
  4. Bauelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es aus Keramik hergestellt ist.
  5. Kronenaufzug aus einem harten Werkstoff für eine Armbanduhr, dadurch gekennzeichnet, dass er ein Loch aufweist, dessen zylindrische Wand ein Gewinde aufweist, das mit dem Element einteilig ausgebildet ist, und dass das Gewinde ohne Materialabtragung erhalten ist.
  6. Uhrengehäuse aus einem harten Werkstoff für eine Armbanduhr, dadurch gekennzeichnet, dass es ein Loch aufweist, dessen zylindrische Wand ein Gewinde aufweist, das mit dem Element einteilig ausgebildet ist, und dass das Gewinde ohne Materialabtragung erhalten ist.
  7. Armbandelement aus einem harten Werkstoff für eine Armbanduhr, dadurch gekennzeichnet, dass es ein Loch aufweist, dessen zylindrische Wand ein Gewinde aufweist, das mit dem Element einteilig ausgebildet ist, und dass das Gewinde ohne Materialabtragung erhalten ist.
EP98110407A 1998-06-08 1998-06-08 Bauteil aus Hartmaterial für eine Uhr Expired - Lifetime EP0964318B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98110407A EP0964318B1 (de) 1998-06-08 1998-06-08 Bauteil aus Hartmaterial für eine Uhr
DE69823484T DE69823484T2 (de) 1998-06-08 1998-06-08 Bauteil aus Hartmaterial für eine Uhr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98110407A EP0964318B1 (de) 1998-06-08 1998-06-08 Bauteil aus Hartmaterial für eine Uhr

Publications (2)

Publication Number Publication Date
EP0964318A1 EP0964318A1 (de) 1999-12-15
EP0964318B1 true EP0964318B1 (de) 2004-04-28

Family

ID=8232083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98110407A Expired - Lifetime EP0964318B1 (de) 1998-06-08 1998-06-08 Bauteil aus Hartmaterial für eine Uhr

Country Status (2)

Country Link
EP (1) EP0964318B1 (de)
DE (1) DE69823484T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3964895A1 (de) * 2020-09-04 2022-03-09 Comadur S.A. Verfahren zur herstellung eines hartmaterials mit einem einsatz aus polymer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4440534A (en) * 1981-04-06 1984-04-03 Labate M D Ceramic insert
DE3120152C2 (de) * 1981-05-21 1984-03-01 Rosenthal Ag, 8672 Selb Verfahren zur Herstellung von keramischen ovalen Besteckgriffen
JPH04354839A (ja) * 1991-05-31 1992-12-09 Sumitomo Electric Ind Ltd 時計用外装部品及びその製造方法
DE4120166C2 (de) * 1991-06-19 1994-10-06 Friedrichs Konrad Kg Strangpreßwerkzeug zur Herstellung eines Hartmetall- oder Keramikstabes mit gedrallten Innenbohrungen
CH680825B5 (de) * 1991-06-27 1993-05-28 Rado Montres Sa

Also Published As

Publication number Publication date
DE69823484T2 (de) 2005-03-03
DE69823484D1 (de) 2004-06-03
EP0964318A1 (de) 1999-12-15

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