EP0374711A1 - Procédé de fabrication d'une boîte de montre comportant deux composants collés l'un à l'autre et procédé de montage d'une montre comprenant cette boîte - Google Patents

Procédé de fabrication d'une boîte de montre comportant deux composants collés l'un à l'autre et procédé de montage d'une montre comprenant cette boîte Download PDF

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Publication number
EP0374711A1
EP0374711A1 EP89123009A EP89123009A EP0374711A1 EP 0374711 A1 EP0374711 A1 EP 0374711A1 EP 89123009 A EP89123009 A EP 89123009A EP 89123009 A EP89123009 A EP 89123009A EP 0374711 A1 EP0374711 A1 EP 0374711A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
component
layer
glue
watch
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.)
Withdrawn
Application number
EP89123009A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jacques Cognard
Francis Chabloz
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.)
ETA SA Manufacture Horlogere Suisse
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
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 Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical Ebauchesfabrik ETA AG
Publication of EP0374711A1 publication Critical patent/EP0374711A1/fr
Withdrawn legal-status Critical Current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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/02—Sealing crystals or glasses
    • G04B39/025—Sealing crystals or glasses without special sealing parts
    • 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
    • G04B37/0008—Cases for pocket watches and wrist watches

Definitions

  • the present invention relates to a method of manufacturing a watch case comprising a first and a second component bonded to each other by a layer of adhesive.
  • US-A-4,763,312 describes a watch case in which the crystal is stuck in a clearance of the middle.
  • the same document also describes a box in which the glass is stuck in a clearance of a telescope, and the latter is stuck in a clearance of the middle.
  • This box has a bottom provided with a peripheral rim engaged in a groove of the middle part and glued in this groove by an epoxy resin.
  • the epoxy resin gives off corrosive effluents during and / or after its polymerization, effluents which risk corroding the watch case and the movement it contains.
  • Thermoplastic adhesives which are well known and will therefore not be listed here, have several advantages over other adhesives which can be used to fix two components of a watch case to each other.
  • thermoplastic adhesives are in particular fairly inexpensive, they are simple to use, they do not give off on hardening or after hardening any effluent which can corrode the components of the watch case or of the watch itself, and it is not it is necessary to subject them to special treatment, such as exposure to ultraviolet rays, so that they harden.
  • Patent FR-B-1 114 244 describes a watch case in which the glass is fixed to the bezel by such a thermoplastic adhesive.
  • this watch case has the same drawbacks as that described in US-A-4,763,312, that is to say that this glass and this bezel must be machined with fairly great precision and the quantity of glue used for their assembly must also be determined with fairly great precision.
  • the assembly method described in this patent FR-B-1,114,244 includes heating the telescope, on which the thermoplastic adhesive has been previously deposited, to a temperature such that this adhesive becomes liquid.
  • thermoplastic adhesive does not meet the mechanical resistance and reliability conditions generally imposed on such an assembly only if the thermoplastic adhesive used has a high melting temperature, preferably greater than 90 or 100 ° C.
  • thermoplastic adhesives also recommend that they be worn, during the assembly operation of the components they have to connect, at a so-called working temperature, which is 20 to 50 ° C higher, depending on the case. their melting temperature.
  • a process similar to that described in patent FR-B-1 114 244 mentioned above cannot therefore be used to suitably assemble, using a thermoplastic adhesive, two components of a watch case when, for example, the first component is the middle part of the case and the second component, the case back for example, must be fixed to this middle part after the watch movement has been mounted in it.
  • An object of the present invention is to provide a method of manufacturing a watch case comprising a first and a second component fixed to each other by a layer of glue which does not have the drawbacks of the known methods used for manufacture boxes of the same kind, that is to say by means of which these components can be manufactured with fairly low precision, by means of which the quantity of glue intended for the assembly of these components can also be determined with relatively low precision without the risk of this glue making burrs, without the connection between these components risk of having insufficient mechanical strength or, if necessary, of not being waterproof, and without the glue used risk of causing corrosion of the case and / or movement it contains, and thanks to which the two components can be assembled even in the presence of other elements of the watch such as, for example, the movement of it.
  • Another object of the present invention is to provide a method of mounting a watch comprising a movement and a case manufactured according to the method of claim 1.
  • the middle part 2 obviously includes means for fixing a crystal and means for fixing a watch movement, but these means have not been shown because, in this example, they may be entirely conventional.
  • the lower part of the middle part that is to say that which is situated on the side of the bottom 3 of the box 1, and which is visible in FIG. 2, comprises a housing constituted by a groove 4 extending, in this example, around the entire periphery of this middle part 2 as seen in FIG. 2.
  • the general shape of the middle part 2 and the groove 4 is circular, in the plan view of FIG. 2, but it will be made clear from the description that this shape can be any, elliptical or rectangular for example.
  • the bottom 3 has a protuberance constituted by a peripheral rim 5 extending over the entire periphery of this bottom 3 as seen in FIG. 3.
  • This rim 5 has the same general shape as the groove 4, that is to say circular in this example, and it is engaged in this groove 4.
  • thermoplastic adhesive 6 in the form of a continuous bead is disposed in the groove 4. This layer 6 adheres to the walls of the latter and to the edge 5 of the base 3, thus ensuring the mechanical connection of this base 3 to the middle part 2.
  • thermoplastic adhesives which can be used to make the bead 6. These adhesives are well known to specialists and will therefore not be listed here. Mention will simply be made, by way of nonlimiting examples, of the adhesive which appears under the reference 49000 in the catalogs of the Company Whittacker Corporation in West Alexandria (Ohio, USA), which has a melting temperature of approximately 100 ° C.
  • the parts of the middle part 2 and of the base 3 which are connected by the layer of glue 6, that is to say the groove 4 and the flange 5, do not need to be made while respecting very tight tolerances, and that the quantity of glue forming this layer 6 can vary in fairly large proportions without there being a risk that this glue makes burrs or does not correctly connect this base 3 to this middle part 2.
  • the connection between the base 3 and the middle part 2 is waterproof, provided of course that the adhesive bead 6 is itself waterproof, even if the dimensions of these components are not very precise.
  • the groove 4 can be produced by a simple turning operation if its shape, when the middle part 2 is plan view, is circular, or by a milling operation if it has another shape.
  • the middle part 2 is produced by injection of a thermoplastic material into a mold, the latter can be shaped so that this middle part 2 directly comprises the groove 4, without it being necessary to machine it specially after this injection.
  • the rim 5 of the bottom 3 can be produced by a simple stamping operation of this bottom 3 if it is made of metal, or be formed at the same time as the bottom 3 if the latter is made by injection of 'a thermoplastic material in a mold.
  • thermoplastic adhesive has certain advantages compared to other types of adhesives, but that it cannot always be used because of the obligation, imposed by its use, to heat the two components before be bonded up to a temperature at least equal to its melting temperature and even up to a temperature equal to its recommended working temperature.
  • thermoplastic adhesive makes it possible to use a thermoplastic adhesive to make the box described above, without running the risk of damaging elements of the watch movement which cannot withstand heat, even if the middle part 2 and the back 3 are assembled in the presence of this movement and even if the thermoplastic adhesive used has a high melting temperature.
  • This process involves the prior formation of the groove 4 in the middle part 2, for example in one of the ways mentioned above.
  • this deposition is carried out so that this adhesive already adheres to the bottom and to the walls of the groove 4 at this stage of the manufacture of the box 1.
  • thermoplastic adhesive intended to form the bead 6 can be done in various ways, only a few of which will be described below by way of nonlimiting examples.
  • the glue which was dissolved therein becomes solid and adheres to the bottom and the walls of the groove 4.
  • thermoplastic adhesive intended to form the bead 6 can also be introduced into the groove 4, also using a syringe for example, while it is at a temperature at least equal to its melting temperature, preferably equal to its recommended working temperature, and therefore in its liquid state.
  • the middle part 2 with this solid ring placed in the groove 4 is then heated to a temperature at least equal to the melting temperature of the adhesive of which this ring is made, preferably up to the working temperature recommended for this glue, so that this ring melts.
  • the middle part 2 can be stored for later use, or be used immediately for operations. following of the manufacture of the box 1.
  • this middle part 2 can even undergo machining operations, without the cord 6 running the risk of coming out of the groove 4.
  • the base 3 When it is desired to fix the base 3 to the middle part 2, the base 3 is heated, and consequently also its rim 5, for example in an oven, to a temperature at least equal to the melting temperature of the glue forming the cord 6, preferably up to a temperature equal to the working temperature recommended for this adhesive. While this base 3 is at this temperature, it is applied against the middle part 2 so that the rim 5 penetrates into the groove 4 and comes into contact with the bead of glue 6.
  • This bead of glue 6 is therefore heated by this rim 5 and melts, that is to say takes or resumes its liquid or pasty state, at least where it is in contact with this rim 5.
  • the latter therefore enters the cord 6 until it reaches the bottom of the groove 4 or until, as shown in FIG. 1, the bottom 3 comes into contact with the rear surface of the middle part 2.
  • the temperature of the rim 5 drops below the melting point of the adhesive of the bead 6, so that the latter solidifies again and adheres to this rim 5, thus ensuring the connection of the back 3 to the middle part 2.
  • the base 3 may not be entirely heated before this installation.
  • this tool can also be used to separate the case back 3 from the middle part 2 if necessary.
  • FIG. 4 schematically represents the bottom of another embodiment of a watch case manufactured using the method according to the invention.
  • This base is designated by 3 as in FIGS. 1 and 3 and comprises, in addition to the rim 5 intended to penetrate into the groove 4 of the middle part 2, a flange 7.
  • This flange 7 is intended to facilitate the retention of the base 3 in the tool mentioned above, especially when the latter is used to separate this base 3 from the middle part 2.
  • this flange 7 is arranged so that it does not bear, or at least not completely, against the middle part 2 when the base 3 is fixed thereto.
  • This tool which is of course shaped accordingly, can thus slide between this middle part 2 and this flange 7 to pull on the bottom 3, while heating it, and separate it from this middle part 2.
  • the collar 7 can have dimensions such that it hides the groove 4 to improve the aesthetics of the box.
  • this movement may be complete when it is introduced into the middle part 2, or else its various elements are introduced one after the other into this middle part 2.
  • the base 3 is put in place and fixed to the middle part 2 in the manner described above.
  • the other may be the glass of the case, or a bezel carrying this glass.
  • This other component can be a simple ring surrounding the crystal and carrying a special scale, for example a speedometer scale.
  • This ring can also have a decorative function by the fact that it carries a decorative pattern of any kind, engraved or printed, and / or that it is made of a material different from that of the middle part, a precious metal for example.
  • the component bonded to the middle part can also be made of a hard material and have the shape of a ring or a cap protecting this middle part from scratches or wear.
  • This component can also occupy only a more or less significant part of the middle.
  • Such a component may have the form of a simple index marking a special angular position of the watch hands, that which these hands occupy at midday and at midnight for example. It can also be constituted by a decorative plate of any shape. Several of these indexes and / or of these plates can also be fixed at different locations on the middle.
  • the housing formed in the middle part for fixing this component will of course have a suitable shape and, in particular, will not extend over the entire periphery of the middle part.
  • the first of the two components of the watch case according to the invention which are glued to one another in the manner described above may also not be the middle part of this case but, for example, a rotating bezel or fixed.
  • any of the other components mentioned above can be attached to this scope in a manner similar to that which has been described.
  • the bead of glue such as the bead 6 of FIG. 1, which ensures their mechanical connection, at the same time ensures sealing of this connection, and that this seal is obtained without any particular measure having to be taken, even if the general shape of these components, in a plan view of the box, is not circular but elliptical or rectangular for example.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP89123009A 1988-12-21 1989-12-13 Procédé de fabrication d'une boîte de montre comportant deux composants collés l'un à l'autre et procédé de montage d'une montre comprenant cette boîte Withdrawn EP0374711A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4730/88A CH676312B5 (el) 1988-12-21 1988-12-21
CH4730/88 1988-12-21

Publications (1)

Publication Number Publication Date
EP0374711A1 true EP0374711A1 (fr) 1990-06-27

Family

ID=4281511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89123009A Withdrawn EP0374711A1 (fr) 1988-12-21 1989-12-13 Procédé de fabrication d'une boîte de montre comportant deux composants collés l'un à l'autre et procédé de montage d'une montre comprenant cette boîte

Country Status (5)

Country Link
EP (1) EP0374711A1 (el)
JP (1) JPH0320693A (el)
CN (1) CN1043803A (el)
BR (1) BR8906669A (el)
CH (1) CH676312B5 (el)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1933213A1 (en) * 2006-12-11 2008-06-18 Globalsat Technology Corporation A water-proof watch case with GPS and a method for manufacturing the same
CN110908435A (zh) * 2018-09-14 2020-03-24 柯马杜股份有限公司 用于组装至少两个元件的方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE513801C2 (sv) * 1999-02-18 2000-11-06 Ericsson Telefon Ab L M Metod att sammanfoga två element samt element av plastmaterial
EP1890203B1 (fr) * 2006-08-17 2012-08-01 Omega SA Boîte de montre comprenant un fond et procédé de fixation d'un fond sur une boîte de montre
DE112010005932T5 (de) 2010-10-12 2013-08-08 Imasen Electric Industrial Co., Ltd. Fahrzeugsitz
JP6239390B2 (ja) * 2014-01-21 2017-11-29 盛岡セイコー工業株式会社 時計部品用接着剤、ムーブメントおよび時計
KR101724008B1 (ko) * 2015-04-07 2017-04-06 삼성에스디아이 주식회사 이차 전지
DE102015212680B4 (de) * 2015-07-07 2017-02-02 Robert Bosch Gmbh Vorrichtung zur Fixierung eines Fügepartners mit einem Fixierelement und einem Ausgleichselement sowie Verfahren zur Herstellung dieser Vorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH139235A (de) * 1929-06-21 1930-04-15 Wachter Frank Uhrgehäuse.
FR1114244A (fr) * 1953-12-02 1956-04-10 Lonza Ag Fixation de verres de montre en une matière synthétique transparente dans une lunette
FR1300077A (fr) * 1961-09-13 1962-07-27 United States Time Corp Boîte de montre et procédé pour sa fabrication
US4763312A (en) * 1986-12-15 1988-08-09 Seiko Epson Corporation Bonding structure for timepieces
EP0284899A1 (fr) * 1987-03-23 1988-10-05 Eta SA Fabriques d'Ebauches Boîte de montre, ensemble destiné à la constituer et procédé pour assembler ledit ensemble

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH139235A (de) * 1929-06-21 1930-04-15 Wachter Frank Uhrgehäuse.
FR1114244A (fr) * 1953-12-02 1956-04-10 Lonza Ag Fixation de verres de montre en une matière synthétique transparente dans une lunette
FR1300077A (fr) * 1961-09-13 1962-07-27 United States Time Corp Boîte de montre et procédé pour sa fabrication
US4763312A (en) * 1986-12-15 1988-08-09 Seiko Epson Corporation Bonding structure for timepieces
EP0284899A1 (fr) * 1987-03-23 1988-10-05 Eta SA Fabriques d'Ebauches Boîte de montre, ensemble destiné à la constituer et procédé pour assembler ledit ensemble

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1933213A1 (en) * 2006-12-11 2008-06-18 Globalsat Technology Corporation A water-proof watch case with GPS and a method for manufacturing the same
CN110908435A (zh) * 2018-09-14 2020-03-24 柯马杜股份有限公司 用于组装至少两个元件的方法
CN110908435B (zh) * 2018-09-14 2024-04-30 柯马杜股份有限公司 用于组装至少两个元件的方法

Also Published As

Publication number Publication date
BR8906669A (pt) 1990-09-11
CH676312GA3 (el) 1991-01-15
CN1043803A (zh) 1990-07-11
CH676312B5 (el) 1991-07-15
JPH0320693A (ja) 1991-01-29

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