CH238538A

CH238538A - A method of decorating a metal dial.

Info

Publication number: CH238538A
Authority: CH
Inventors: Ducommun Jules
Original assignee: Ducommun Jules
Priority date: 1942-11-19
Filing date: 1942-11-19
Publication date: 1945-07-31

Description

  

  Procédé de décoration d'un cadran métallique.    L'objet de la présente invention est un  procédé de décoration d'un     cadran    métallique,  caractérisé en ce qu'on produit par meulage  du     cadran    animé d'un lent mouvement de ro  tation un     striage        curviligne    sur au moins une       partie    de la     surface    visible du cadran, qu'on  atténue l'effet du     striage    curviligne par un  brossage à la, brosse ide soie fine garnie  d'abrasif et qu'on recouvre au moins la sur  face ainsi traitée d'une     substance    protectrice.  



  Le dessin ci-annexé     représente,    à titre       d'exemples,    deux cadrans     décorés    par le pro  cédé faisant l'objet de l'invention.  



  Le cadran de montre rond représenté dans  la     fig.    1 présente sur     toute    sa surface supé  rieure ou     surface    visible, un     striage    rayonné       curviligne    -dont l'effet     décoratif    se traduit par  un reflet flammé très léger dont l'éclat n'in  fluence pas défavorablement la lecture     du     tour d'heures.

   Pour l'obtenir, on procède de  la façon     suivante:    on fait     tourner    lentement  sur son axe un disque métallique mince cons  tituant l'ébauche -du cadran, par exemple un  disque en laiton, et soumet sa surface visible    à un meulage au     moyen.        d'un.        disque        rotatif     en liège .garni d'abrasif.

       Cette    opération pro  duit, dans le cas, de la     fig.    1, un     striage     rayonné curviligne se traduisant par un reflet  flammé     très        intense.    On brosse ensuite la sur  face     .striée    avec une brosse de soie très. fine  plongée dans une pâte abrasive, par exemple  dans une pâte     aqueuse    de pierre ,du Levant.  On atténue ainsi le     striage,        ce    qui a pour  effet de ramener le reflet flammé à     une    inten  sité qui ne peut pas nuire à la précision de  la lecture du tour d'heures.

   On     recouvre    en  suite la     surface    ainsi traitée d'un enduit ou  d'un dépôt galvanique tel que cuivre, argent,  nickel. Le reflet flammé atténué persiste sur  le dépôt métallique.  



  Le     cadran    représenté en     fig.    2     présente     une zone périphérique     bombée    qui, seule, est       striée    par meulage. Avant le     striage    de     cette     zone     périphérique,    on peut     soumettre    toute la       surface    à un brossage rectiligne à la brosse à  grener,

       ce    qui a pour effet de rendre la     partie     centrale -de la     surface    visible plus     mate    que  la zone périphérique     striée.  



  A method of decorating a metal dial. The object of the present invention is a method of decorating a metal dial, characterized in that by grinding the dial driven by a slow rotational movement, a curvilinear streak is produced on at least part of the visible surface. of the dial, that the effect of the curvilinear streaking is attenuated by brushing with a fine bristle brush filled with abrasive and that at least the surface thus treated is covered with a protective substance.



  The appended drawing shows, by way of example, two dials decorated by the process forming the subject of the invention.



  The round watch face shown in fig. 1 has a curvilinear radiated stripe over its entire upper surface or visible surface - the decorative effect of which is reflected in a very light flamed reflection, the luster of which does not adversely affect the reading of the hour mark.

   To obtain it, the procedure is as follows: a thin metal disc constituting the blank - of the dial, for example a brass disc, is slowly rotated on its axis, and its visible surface is subjected to grinding by means. of one. cork rotating disc. coated with abrasive.

       This operation produces, in the case of FIG. 1, a curvilinear radiated streak resulting in a very intense flamed reflection. The striped surface is then brushed with a very bristle brush. fine immersed in an abrasive paste, for example in an aqueous stone paste, from the Levant. The streaking is thus attenuated, which has the effect of reducing the flamed reflection to an intensity which cannot adversely affect the precision of the reading of the hour circle.

   The surface thus treated is then covered with a coating or a galvanic deposit such as copper, silver, nickel. The attenuated flamed reflection persists on the metallic deposit.



  The dial shown in fig. 2 has a curved peripheral zone which, on its own, is ridged by grinding. Before the striation of this peripheral zone, the entire surface can be subjected to rectilinear brushing with a graining brush,

       which has the effect of making the central part of the visible surface more matt than the striated peripheral zone.

Claims

CLAIM I: A method of decorating a liquid metal dial, characterized in that, by grinding the dial driven by a slow rotational movement, a curvilinear streak is produced on at least part of the visible surface of the dial, which the effect of the eurvilinear stria.ge is attenuated by brushing with a fine bristle brush filled with abrasive and covering at least the surface thus treated with a protective substance. SUB-CLAIM S: 1.

Process according to Claim I, characterized in that the entire surface of the dial is subjected to a rectilinear brushing prior to the graining brush, subjects to the viline curvilinear streaking only a part of this surface, attenuates the effect of the streaking of said part by brushing with a bristle brush and covers the entire surface with a coating. 2. Method according to claim I and sub-claim l., Characterized in that only a peripheral zone of the dial is streaked. 3.

Process according to Claim I, characterized in that the striated surface is covered with a galvanic deposit. CLAIM II: Metal dial decorated by the process according to claim I, characterized in that at least part of its visible surface has an attenuated curvilinear streak. SUB-CLAIM d.

Dial according to Claim II, with a curved peripheral zone, characterized in that this domed peripheral zone has an attenuated curvilinear streak.