EP0370356A1 - Uhrengehäuse mit einem gesinterten Mittelteil - Google Patents

Uhrengehäuse mit einem gesinterten Mittelteil Download PDF

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Publication number
EP0370356A1
EP0370356A1 EP89121006A EP89121006A EP0370356A1 EP 0370356 A1 EP0370356 A1 EP 0370356A1 EP 89121006 A EP89121006 A EP 89121006A EP 89121006 A EP89121006 A EP 89121006A EP 0370356 A1 EP0370356 A1 EP 0370356A1
Authority
EP
European Patent Office
Prior art keywords
pin
holes
pins
watch case
case according
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
EP89121006A
Other languages
English (en)
French (fr)
Other versions
EP0370356B1 (de
Inventor
Eric Loth
Gaston Gagnebin
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.)
Tissot SA
Original Assignee
Tissot SA
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 Tissot SA filed Critical Tissot SA
Publication of EP0370356A1 publication Critical patent/EP0370356A1/de
Application granted granted Critical
Publication of EP0370356B1 publication Critical patent/EP0370356B1/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
    • G04B37/00—Cases
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/11—Hermetic sealing of openings, joints, passages or slits of the back cover of pocket or wrist watches
    • 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
    • G04B37/14—Suspending devices, supports or stands for time-pieces insofar as they form part of the case
    • G04B37/1486—Arrangements for fixing to a bracelet

Definitions

  • the present invention relates to a wristwatch case comprising a crystal, a middle serving as a housing for a movement equipped with time display hands, said middle being produced by means of powders agglomerated by sintering at more than 500 ° C, a base, fixing means for removably securing the base to the middle part and a gasket arranged between said middle part and said bottom.
  • a watch case meeting the generic definition given above has been described in document EP-A-0 264 875.
  • the case is preferably made of ceramic for its middle part and of steel for its back part.
  • the base is fixed to the middle by means of four screw fixing points.
  • the middle carries holes in which are driven plugs. Each plug is then drilled-tapped using the internal bore of the middle as a reference.
  • This technique is used here because it is unthinkable to directly screw screws into ceramic. It is understood, however, that this way of doing is expensive because it requires additional parts, plugs which, moreover, during hunting, risk of causing the ceramic to jump.
  • the operation of drilling plugs also requires care which must be paid for in manufacturing time and therefore in money.
  • the watch sold under the registered trademark "OMEGA ART” offers as a middle part the combination of a ceramic ring and a steel circle glued inside the ring. The back is then secured to the middle by means of screws screwed directly into the steel circle.
  • This solution avoids the plugs used in the document cited above, but requires the manufacture of a circle and the bonding of this circle inside the ceramic ring, which also is expensive.
  • the document CH-A-458 217 describes a watch case in which the back is hung on the middle part on the one hand by means of lugs engaging in housings made in a first pair of horns carried by the middle part and on the other hand by means of two pins crossing both the bottom and a second pair of horns.
  • the pins are not used to secure the strands of the bracelet to the box at the same time.
  • the present invention makes it possible to use a solid middle obtained by means of powders agglomerated by sintering at more than 500 ° C., that is to say a middle made, for example of ceramic or of metallic carbide. , without the resulting disadvantages cited inherent in the system for attaching the cover to the middle part.
  • the present invention is characterized in that the means for fixing the base to the middle part comprise at least two pins arranged on either side of the case and parallel to the bottom, each of said pins being housed in holes arranged in alignment and made both in said middle and said back, each of said pins serving jointly to attach to the box a strand of the bracelet that includes the watch.
  • Figure 1 shows a first embodiment of the invention.
  • the section shown shows that the box has a crystal 1, a middle part 2 serving as a housing for a movement 8 equipped with hands 3, 4 for displaying the time.
  • the movement is centered in its housing by means of an enlarging circle 5 and its dial 6 is kept at a distance from the crystal by means of a flange 7.
  • the crystal 1 is glued or welded to the middle.
  • a metallization 30 can hide the flange and the middle part from the eye.
  • the middle part 2 is produced by means of powders agglomerated by sintering at more than 500 ° C. It is for example ceramic or metallic carbide obtained by sintering.
  • the minimum temperature of 500 ° C. indicates that the invention does not relate to the use of plastics, for example, for which other solutions can be used.
  • the box also has a bottom 10 and a seal 11 arranged between the middle part and the bottom.
  • the base is removably secured to the middle part by a pin device which is the main object of the present invention and which will be described in detail below.
  • FIG. 2 shows more particularly that the middle part 2 carries a passage 9 intended to receive, in a manner known in addition, the time-setting rod (not shown).
  • Figure 3 is a section along the line III-III shown in Figure 1.
  • Figure 3 shows more precisely how is fixed the bottom 10 on the middle 2.
  • the means for fixing the base to the middle part comprise at least two pins arranged on either side of the case and parallel to the bottom, only one of these pins bearing the reference 12 being shown in the drawing, since the box has diametrical symmetry.
  • each pin is housed in holes 13, 14, 15 arranged in alignment and made both in the middle part 2 and in the base 10.
  • the pins 10 are located one at 6 o'clock and the other at 12 o'clock in the watch case. As is very apparent in FIG. 3, the pin 10 passes through a first hole 14 made in a first projection 16 arranged in the middle part 2 and two second holes 13, 15 made respectively in two second projections 17 and 18 arranged in the bottom 10 , said two second projections being arranged respectively on either side of said first projection.
  • FIGS. 1 and 3 show in particular that the holes 13, 14 and 15 are circular and that the pin 12 is cylindrical.
  • the pin is retained axially in its housing by the elastic effect provided by the lining 11 disposed between the middle part 2 and the base 10.
  • the strand has a cutout 20 which embraces the three projections 16, 17 and 18.
  • FIG. 4 A variant of the embodiment presented in Figures 1 and 3 is shown in Figures 4 and 5.
  • the pin 12 has a groove 21 in the middle.
  • a tube 22 In the first hole 14 arranged in the projection 16 is housed a tube 22 provided with a constriction 23. It is arranged so that the internal diameter 24 of the tube and the diameter of the second holes 13 and 15 are slightly greater than the diameter of the pin 12 so that the pin freely enters these housings. Under these conditions, the pin is retained axially when the constriction 23 of the tube 22 enters the groove 21 of the pin 22, since the orifices of the tube abut against the projections 17 and 18, according to a known technique and exposed in the document CH-A-235 604.
  • two projections arranged in the bottom embrace on either side a projection arranged in the middle. It will be understood that there can be other ways of doing things without departing from the main object of the present invention. That in particular which would consist in having only one projection in the bottom, the latter penetrating into a corresponding housing in the middle. In this case, the middle part would not have a projection proper, but, in addition to the housing mentioned, a simple bore extending along a cord of the ring presented by the middle part.
  • FIG. 7 A second embodiment of the invention is sketched in FIG. 7.
  • the middle part 2 has two projections 26 and 27 at 6 o'clock and the bottom two projections 28 and 29 hidden by a cutout of a strand 19 of the bracelet.
  • the pin 12 serves as a means of fixing the base to the middle in the same way as that described above.
  • the watch case middle according to the invention is made of hard material, such as ceramic or hard metal obtained by sintering powders.
  • This material is chosen especially for its resistance to scratches and also for the beautiful aesthetic appearance it presents.
  • it is known that such a material is difficult to machine so that it is necessary to minimize the recovery operations. Thanks to the present invention, these operations are no longer necessary at least as regards the manner of fixing the base under the middle. It suffices to size the hole 14, which will receive the pin 12, in such a way that its internal diameter always remains larger than the diameter of the pin, whatever the dimensional modifications undergone by the material during the operation of sintering (removal, etc.).
  • FIG. 8 which is a diagram showing the pressure p (in N / m2) exerted on the lining as a function of its deformation ⁇ l (in meters) for three forms of lining: square (c), round of small diameter (r) and large diameter round (R).
  • the diagram clearly shows that a lining of square section (c) has a very limited deformation ⁇ l to quickly reach considerable pressures.
  • a gasket of round section of large diameter (R) has a very large deformation ⁇ l and may provide sufficient pressure even if the space between the base and the middle varies within wide limits.
  • a packing will be chosen whose diameter is greater than or equal to 0.8 mm.
  • the small diameter round section packing (r) presents an intermediate situation.
  • the diagram in FIG. 8 therefore shows that, in the box according to the invention, it is advantageous to choose a gasket having a round section of large diameter, while mentioning that an almost identical result can be achieved by using two small diameter round section fittings which will be superimposed.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Gasket Seals (AREA)
  • Adornments (AREA)
  • Powder Metallurgy (AREA)
  • Closures For Containers (AREA)
EP89121006A 1988-11-23 1989-11-13 Uhrengehäuse mit einem gesinterten Mittelteil Expired - Lifetime EP0370356B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4337/88 1988-11-23
CH4337/88A CH674692B5 (de) 1988-11-23 1988-11-23

Publications (2)

Publication Number Publication Date
EP0370356A1 true EP0370356A1 (de) 1990-05-30
EP0370356B1 EP0370356B1 (de) 1992-04-01

Family

ID=4274213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121006A Expired - Lifetime EP0370356B1 (de) 1988-11-23 1989-11-13 Uhrengehäuse mit einem gesinterten Mittelteil

Country Status (7)

Country Link
US (1) US4974218A (de)
EP (1) EP0370356B1 (de)
JP (1) JPH02236487A (de)
CN (1) CN1017005B (de)
CH (1) CH674692B5 (de)
DE (1) DE68901132D1 (de)
HK (1) HK106696A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004055603A1 (ja) 2002-12-17 2004-07-01 Namiki Seimitsu Houseki Kabushiki Kaisha 超硬腕時計ケース
EP3534224A1 (de) * 2018-03-02 2019-09-04 Patek Philippe SA Genève Armbanduhrgehäuse mit verdeckten zusammenbaumitteln, und dieses umfassende armbanduhr

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007171128A (ja) * 2005-12-26 2007-07-05 Seiko Instruments Inc 時計
JP2007171129A (ja) * 2005-12-26 2007-07-05 Seiko Instruments Inc 時計
DE102009058980B4 (de) * 2009-12-18 2019-08-14 Oechsler Ag Spritzguss-Keramikelement mit einem Verbindungsteil
EP2874022B1 (de) * 2013-11-15 2016-10-26 Chopard Technologies SA Armbanduhrengehäuse, das eine Bajonettverbindung umfasst
WO2018058388A1 (zh) * 2016-09-28 2018-04-05 华为技术有限公司 一种可穿戴设备及其主体

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR976102A (fr) * 1942-04-09 1951-03-14 Jaeger Ets Ed Perfectionnements aux montres-bracelets
CH323054A (fr) * 1955-08-10 1957-07-15 Boites De Montres Huguenin S A Boîte de montre de forme
CH458217A (fr) * 1965-07-09 1968-08-15 Caprara Pierre Boîte de montre
US3861990A (en) * 1972-03-27 1975-01-21 Suwa Seikosha Kk Exterior parts for a timepiece
FR2510776A1 (fr) * 1981-08-03 1983-02-04 Textron Inc Boitier pour module de montre electronique
DE3540737A1 (de) * 1985-11-16 1987-05-21 Peter Dipl Ing Grob Armbanduhr mit angeformtem gliederband
EP0280963A1 (de) * 1987-02-25 1988-09-07 Eta SA Fabriques d'Ebauches Eine mit einer Kappe bedeckte Uhr und Montageverfahren einer solchen Uhr

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH262846A (fr) * 1947-10-03 1949-07-31 Schild Sa A Boîte de montre-bracelet.
FR2231042A1 (en) * 1973-05-23 1974-12-20 Chatenoud Gilles Wrist watch with interchangeable decorative surround - covers point where bracelet is secured to watch case
CH666379GA3 (de) * 1986-10-22 1988-07-29
US4825427A (en) * 1988-04-25 1989-04-25 Bulova Watch Co., Inc. Wrist watch case and bracelet assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR976102A (fr) * 1942-04-09 1951-03-14 Jaeger Ets Ed Perfectionnements aux montres-bracelets
CH323054A (fr) * 1955-08-10 1957-07-15 Boites De Montres Huguenin S A Boîte de montre de forme
CH458217A (fr) * 1965-07-09 1968-08-15 Caprara Pierre Boîte de montre
US3861990A (en) * 1972-03-27 1975-01-21 Suwa Seikosha Kk Exterior parts for a timepiece
FR2510776A1 (fr) * 1981-08-03 1983-02-04 Textron Inc Boitier pour module de montre electronique
DE3540737A1 (de) * 1985-11-16 1987-05-21 Peter Dipl Ing Grob Armbanduhr mit angeformtem gliederband
EP0280963A1 (de) * 1987-02-25 1988-09-07 Eta SA Fabriques d'Ebauches Eine mit einer Kappe bedeckte Uhr und Montageverfahren einer solchen Uhr

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004055603A1 (ja) 2002-12-17 2004-07-01 Namiki Seimitsu Houseki Kabushiki Kaisha 超硬腕時計ケース
EP1577717A1 (de) * 2002-12-17 2005-09-21 Namiki Seimitsu Houseki Kabushiki Kaisha Sehr robustes hartschalenetui für armbanduhr
EP1577717A4 (de) * 2002-12-17 2008-03-05 Namiki Precision Jewel Co Ltd Sehr robustes hartschalenetui für armbanduhr
EP3534224A1 (de) * 2018-03-02 2019-09-04 Patek Philippe SA Genève Armbanduhrgehäuse mit verdeckten zusammenbaumitteln, und dieses umfassende armbanduhr

Also Published As

Publication number Publication date
US4974218A (en) 1990-11-27
DE68901132D1 (de) 1992-05-07
CH674692B5 (de) 1991-01-15
EP0370356B1 (de) 1992-04-01
HK106696A (en) 1996-06-28
JPH02236487A (ja) 1990-09-19
CN1043008A (zh) 1990-06-13
CH674692GA3 (de) 1990-07-13
CN1017005B (zh) 1992-06-10

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