EP0964318A1 - Bauteil aus Hartmaterial für eine Uhr - Google Patents

Bauteil aus Hartmaterial für eine Uhr Download PDF

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Publication number
EP0964318A1
EP0964318A1 EP98110407A EP98110407A EP0964318A1 EP 0964318 A1 EP0964318 A1 EP 0964318A1 EP 98110407 A EP98110407 A EP 98110407A EP 98110407 A EP98110407 A EP 98110407A EP 0964318 A1 EP0964318 A1 EP 0964318A1
Authority
EP
European Patent Office
Prior art keywords
crown
wristwatch
ceramic
thread
hard material
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
Application number
EP98110407A
Other languages
English (en)
French (fr)
Other versions
EP0964318B1 (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 DE69823484T priority Critical patent/DE69823484T2/de
Priority to EP98110407A priority patent/EP0964318B1/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

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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
    • 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 an element of hard material construction for wristwatch and particular a watch case middle, a crown winder or bracelet links made in one material with a Vickers hardness greater than or equal to 1100 HV.
  • these hard metal trim pieces by example of tungsten carbide, titanium carbonitride or even ceramic.
  • Patent CH 622 151 describes an example of structure for assembling a case back to a case case middle made of corundum.
  • the middle includes a plurality of housings obtained for example by ultrasonic machining, by grinding or by EDM. These dwellings have a flat bottom and a slightly frustoconical side face and open into the underside of the middle part. Of threaded plugs are fixed by gluing in the middle housing. Screws pass through openings from the bottom and engage in the plugs in which they are screwed. This assembly technique is also used to make crowns ceramic winder.
  • the dosage of the glue during its application in housing is very difficult to control, taking into account the bonding surface relatively small on which the caps are stuck.
  • the implementation of this technique assembly is all the more delicate as the dimensions are weak.
  • 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 prior art mentioned above, by providing a construction element in hard material for 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 an element of hard material construction for wristwatch, characterized in that it comprises a hole whose wall cylindrical has a thread which comes in one piece with said element.
  • the assembly can be easily made by screwing directly into the body of said building element, which gives it improved reliability.
  • this element of construction it is possible to make an assembly with another element having a mechanical connection solid positive not including the adhesion phenomenon.
  • Wristwatch 1 shown schematically and partially in Figure 1, has a box 2 formed conventionally of a middle part 4, a glass 6 and a back 8. Watch 1 further comprises means for setting hour 10 cooperating in a known manner with a movement clock housed in box 1.
  • the means 10 include in particular a rod crown 12 crowned with a crown 14.
  • Crown 14 which forms a building element of wristwatch 1, is made of a hard material, i.e. a material with Vickers hardness greater than or equal to 1100.
  • the crown 14 can be made of "hard metal", “cermet” or still in ceramic material.
  • hard metal is meant two-phase composite materials consisting of one phase metallic coating of hard particles such as particles of tungsten carbide or the like.
  • cermet means two-phase composite materials consist of a metallic phase which coats hard particles such as carbonitride particles of titanium or the like.
  • the crown 14 (FIG. 2) comprises a hole 16 whose cylindrical wall has a thread interior 18 which comes in one piece with the crown 14 and by which it is directly screwed onto the rod winder 12.
  • the thread 18 is obtained without removing material by machining using any tool.
  • the diameter of the crown 14 is between about 2 and 5 mm and the diameter of the hole 16 threaded is between about 2 and 3 mm, the length of the thread 18 is between approximately 1 and 2.5 mm, the manufacturing tolerances for such parts for wristwatches being of the order of 2 to 3 hundredths of millimeter.
  • crowns 14 according to the invention withstand considerably more tensile forces higher than crowns with glued threaded plugs in accordance with the prior art.
  • the direct mechanical connection between the winding stem 12 and the crown 14 resists tensile forces of the order of 800 N (rod breakage 12) and more, whatever the environmental conditions while the bond mechanical bonded between a cap and a crown resists, on average, at tensile forces of the order of 70 to 110 N under normal conditions, and drops to 26 N under tropical climatic conditions.
  • a ceramic powder for example oxide powder stabilized zirconium.
  • the powder used has a size 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 classic atomizer.
  • the granule obtained is sieved, typically 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 form a cylindrical rod on which we dug helical grooves to leave in relief a net whose the external shape corresponds to that of the threaded hole longed for.
  • the mold and the core are of course sized to take into account the phenomenon of shrinkage that the crown will undergo during the subsequent sintering.
  • the dimensions are typically 20 to 25% greater than final dimensions of the crown.
  • the core is unscrewed and the crown is unmolded.
  • the binder is then removed by a process conventional thermal. After removing the binder, the crown is placed in a sintering oven in which it is heated between 1300 ° C and 1600 ° C for approximately one 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 may be directly screwed onto a winding stem having a thread appropriate.
  • 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 references digital.
  • 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 the cylindrical wall of which has an internal thread 18 which comes integrally with the body of the middle part 6. These holes 16 open into the underside of the middle part 6 and directly receive screws 20 which pass through openings 22 in the bottom 8 to fix the latter to the middle 6.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Adornments (AREA)
  • Ceramic Products (AREA)
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
DE69823484T DE69823484T2 (de) 1998-06-08 1998-06-08 Bauteil aus Hartmaterial für eine Uhr
EP98110407A EP0964318B1 (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 true EP0964318A1 (de) 1999-12-15
EP0964318B1 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)

Cited By (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

Citations (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
US4521356A (en) * 1981-05-21 1985-06-04 Rosenthal Aktiengesellschaft Decorative flatware handles and process for their preparation
EP0516164A1 (de) * 1991-05-31 1992-12-02 Sumitomo Electric Industries, Limited Aussenteile einer Uhr und Verfahren zur Herstellung
EP0520224A1 (de) * 1991-06-27 1992-12-30 Montres Rado S.A. Uhrengehäuse mit einem aufwärts längs des Mittelteils montierten Boden
DE4120166A1 (de) * 1991-06-19 1993-01-07 Friedrichs Konrad Kg Strangpresswerkzeug zur herstellung eines hartmetall- oder keramikstabes mit gedrallten innenbohrungen

Patent Citations (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
US4521356A (en) * 1981-05-21 1985-06-04 Rosenthal Aktiengesellschaft Decorative flatware handles and process for their preparation
EP0516164A1 (de) * 1991-05-31 1992-12-02 Sumitomo Electric Industries, Limited Aussenteile einer Uhr und Verfahren zur Herstellung
DE4120166A1 (de) * 1991-06-19 1993-01-07 Friedrichs Konrad Kg Strangpresswerkzeug zur herstellung eines hartmetall- oder keramikstabes mit gedrallten innenbohrungen
EP0520224A1 (de) * 1991-06-27 1992-12-30 Montres Rado S.A. Uhrengehäuse mit einem aufwärts längs des Mittelteils montierten Boden

Cited By (2)

* 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
WO2022048983A1 (fr) * 2020-09-04 2022-03-10 Comadur Sa Procede de fabrication d'une piece en materiau dur avec un insert en polymere

Also Published As

Publication number Publication date
DE69823484D1 (de) 2004-06-03
EP0964318B1 (de) 2004-04-28
DE69823484T2 (de) 2005-03-03

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