EP0370356B1 - Boîte de montre comportant une carrure frittée - Google Patents

Boîte de montre comportant une carrure frittée Download PDF

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Publication number
EP0370356B1
EP0370356B1 EP89121006A EP89121006A EP0370356B1 EP 0370356 B1 EP0370356 B1 EP 0370356B1 EP 89121006 A EP89121006 A EP 89121006A EP 89121006 A EP89121006 A EP 89121006A EP 0370356 B1 EP0370356 B1 EP 0370356B1
Authority
EP
European Patent Office
Prior art keywords
caseband
back cover
pins
holes
seal
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
EP89121006A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0370356A1 (fr
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/fr
Application granted granted Critical
Publication of EP0370356B1 publication Critical patent/EP0370356B1/fr
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 bottom, fixing means for removably securing the bottom to the middle part and a seal fitted between said middle part and said bottom, said fixing means comprising at least two cylindrical pins arranged on either side of the box and parallel to the bottom, each of said pins being housed in circular holes arranged in alignment and made both in said middle part and in said bottom, each of said pins serving jointly to attach a strand of the bracelet which comprises the watch.
  • the box described in document EP-A-0 264 875 is preferably made of ceramic for its middle part and of steel for its bottom 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 things is expensive because it requires additional parts, plugs which, moreover, during hunting, risk 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 sticking this circle inside the ceramic ring, which is also 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 which the middle carries and d 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 metallic carbide, without it being results from the cited drawbacks inherent in the system for fixing the cover to the middle part and without it being necessary to touch up, after sintering, the holes which will receive the pins also serving to fix the bottom and the strands of the bracelet.
  • the present invention is characterized in that, said middle part being produced by means of powders agglomerated by sintering at more than 500 ° C., the diameter of said holes arranged so that the pin penetrates therein freely, each of said pins being retained axially in said holes by the elastic effect provided by the lining disposed between the middle part and the back, when the back is placed on the middle.
  • 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 back 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 line III-III shown in Figure 1.
  • Figure 3 shows more precisely how is fixed the bottom 10 on the middle 2.
  • the means of fixing the bottom in the middle have at least two pins arranged on either side of the box and parallel to the bottom, only one of these pins bearing the reference 12 being shown in the drawing, since the box has a 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.
  • the pin 12 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. According to the main characteristic of the invention, it is arranged in such a way that the pin penetrates freely into the holes, which suggests a certain play between the holes and the pin (see FIG. 1). It will be understood that 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 comprises a cutout 20 which embraces the three projections 16, 17 and 18.
  • 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. 5 A second embodiment of the invention is sketched in FIG. 5.
  • 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. 6 which is a diagram showing the pressure p (in N / m2) exerted on the lining as a function of its deformation ⁇ 1 (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 gasket of square section (c) has a very limited deformation ⁇ 1 to quickly reach considerable pressures.
  • a large-diameter round section lining (R) has a very large deformation ⁇ 1 and can provide sufficient pressure even if the space between the base and the middle part 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. 6 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)
  • Closures For Containers (AREA)
  • Adornments (AREA)
  • Powder Metallurgy (AREA)
EP89121006A 1988-11-23 1989-11-13 Boîte de montre comportant une carrure frittée Expired - Lifetime EP0370356B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=4274213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121006A Expired - Lifetime EP0370356B1 (fr) 1988-11-23 1989-11-13 Boîte de montre comportant une carrure frittée

Country Status (7)

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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4348599B2 (ja) * 2002-12-17 2009-10-21 並木精密宝石株式会社 超硬腕時計ケース
JP2007171129A (ja) * 2005-12-26 2007-07-05 Seiko Instruments Inc 時計
JP2007171128A (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 (fr) * 2013-11-15 2016-10-26 Chopard Technologies SA Boîte de montre comprenant une liaison à baïonnette
EP3510888B1 (en) * 2016-09-28 2022-06-01 Huawei Technologies Co., Ltd. Wearable device and main body thereof
EP3534224B1 (fr) * 2018-03-02 2020-10-21 Patek Philippe SA Genève Boîte de montre à moyens d'assemblage cachés et montre la comprenant

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0264875A1 (fr) * 1986-10-22 1988-04-27 Eta SA Fabriques d'Ebauches Attache du bracelet à une boîte de montre

Family Cites Families (10)

* 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
CH262846A (fr) * 1947-10-03 1949-07-31 Schild Sa A Boîte de montre-bracelet.
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
GB1414864A (en) * 1972-03-27 1975-11-19 Suwa Seikosha Kk Method of producing an externally visible part of a watch
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
US4396298A (en) * 1981-08-03 1983-08-02 Textron, Inc. Case for electronic watch module
DE3540737A1 (de) * 1985-11-16 1987-05-21 Peter Dipl Ing Grob Armbanduhr mit angeformtem gliederband
CH667566GA3 (el) * 1987-02-25 1988-10-31
US4825427A (en) * 1988-04-25 1989-04-25 Bulova Watch Co., Inc. Wrist watch case and bracelet assembly

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0264875A1 (fr) * 1986-10-22 1988-04-27 Eta SA Fabriques d'Ebauches Attache du bracelet à une boîte de montre

Also Published As

Publication number Publication date
HK106696A (en) 1996-06-28
CH674692GA3 (el) 1990-07-13
EP0370356A1 (fr) 1990-05-30
CH674692B5 (el) 1991-01-15
CN1017005B (zh) 1992-06-10
DE68901132D1 (de) 1992-05-07
US4974218A (en) 1990-11-27
CN1043008A (zh) 1990-06-13
JPH02236487A (ja) 1990-09-19

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