CH332881A

CH332881A - Method of manufacturing a dial for a timepiece with added signs and dial obtained by this method

Info

Publication number: CH332881A
Authority: CH
Inventors: Vuilleumier Pierre
Original assignee: Jean Singer & Cie S A
Priority date: 1958-04-17
Filing date: 1958-04-17
Publication date: 1958-09-30

Description

  

   <Desc/Clms Page number 1> 
 Procédé de fabrication d'un cadran de pièce d'horlogerie à signes rapportés et cadran obtenu par ce procédé La présente invention se rapporte à un procédé de fabrication d'un cadran de pièce d'horlogerie à signes rapportés et au cadran obtenu par ce procédé ; celui-ci est caractérisé par le fait que l'on termine séparément la plaque de cadran et le signe, ce dernier étant muni sur sa face inférieure d'une saillie dont la section par un plan parallèle à la    surface   de la plaque de cadran est faible par    rapport   à une section semblable du corps du signe, puis soude électriquement le signe à la plaque, la saillie en question se ramollissant et faisant corps avec cette dernière. 



  Le dessin ci-annexé illustre, à titre d'exemple, une mise en    oeuvre   particulière du procédé selon l'invention. 



  La    fig.   1 représente une plaque de cadran terminée et la    fig.   2 est une coupe par 11-1I de la    fig.   1. La    fig.   3 montre un signe posé sur la plaque de cadran, et la    fig.   4 est une coupe d'une variante de ce signe. 



  La plaque de cadran représentée aux    fig.   1 et 2 comprend une base métallique 1 sur laquelle ont été apposées successivement une couche argentée 2 et une couche 3 protectrice, par exemple en    zapon,   l'épaisseur de ces couches étant volontairement exagérée en    fig.   2. Les signes 4 à fixer sur cette plaque sont métalliques et comprennent (voir    fig.   3) un corps 4a à section radiale rectangulaire ; ils présentent sur leur face inférieure deux pointes 4b qui, lorsque le signe est pressé contre la plaque, traversent la couche isolante 3 et viennent en contact avec la base    métallique   1 ; on peut alors souder le signe à celle-ci, par voie électrique, les pointes se ramollissant et faisant corps avec cette dernière. 



  Dans la variante de la    fig.   4, les pointes 4b sont remplacées par un manteau 5, à paroi mince, faisant le tour de la base du signe. 



  La section des pointes 4b ou du manteau 5 par un plan parallèle à la plaque de cadran est très faible par rapport à une section analogue du corps du    chiffre,   ceci afin d'opposer une grande résistance au passage du courant électrique ; ces pointes et ce manteau, en outre, sont tranchants afin de traverser aisément la couche de    zapon.  



   <Desc / Clms Page number 1>
 Method for manufacturing a timepiece dial with added signs and dial obtained by this method The present invention relates to a method of manufacturing a timepiece dial with added signs and to the dial obtained by this method ; the latter is characterized by the fact that the dial plate and the sign are finished separately, the latter being provided on its underside with a projection whose section by a plane parallel to the surface of the dial plate is weak compared to a similar section of the body of the sign, then electrically welds the sign to the plate, the protrusion in question softening and becoming one with the latter.



  The appended drawing illustrates, by way of example, a particular implementation of the method according to the invention.



  Fig. 1 shows a finished dial plate and fig. 2 is a section through 11-1I of FIG. 1. FIG. 3 shows a sign placed on the dial plate, and FIG. 4 is a section through a variant of this sign.



  The dial plate shown in Figs. 1 and 2 comprises a metal base 1 on which have been affixed successively a silver layer 2 and a protective layer 3, for example of zapon, the thickness of these layers being deliberately exaggerated in FIG. 2. The signs 4 to be fixed on this plate are metallic and include (see fig. 3) a body 4a with a rectangular radial section; they have on their lower face two points 4b which, when the sign is pressed against the plate, pass through the insulating layer 3 and come into contact with the metal base 1; we can then weld the sign to it, electrically, the tips softening and forming a body with the latter.



  In the variant of FIG. 4, the points 4b are replaced by a coat 5, with a thin wall, going around the base of the sign.



  The section of the points 4b or of the mantle 5 by a plane parallel to the dial plate is very small compared to a similar section of the body of the numeral, in order to oppose a great resistance to the passage of the electric current; these points and this coat, moreover, are sharp in order to easily cross the layer of zapon.

Claims

CLAIMS I. A method of manufacturing a dial for a timepiece with added signs, characterized in that the dial plate and the sign are finished separately, the latter being provided on its underside with a projection with which the section through a plane parallel to the surface of the dial plate is small. by <Desc / Clms Page number 2> compared to a similar section of the body of the sign, then electrically welds the sign to the plate, the protrusion in question softening and forming a unit with the latter. II. Clockwork dial with added signs, obtained by the process according to claim I. SUB-CLAIMS 1.

Process according to Claim I, characterized in that the plate, before being subjected to electric welding, is covered with a layer of protective material. 2. Method according to claim I, characterized in that the above-mentioned projection is sharp at its lower part. 3. Method according to claim I, characterized in that the above-mentioned projection has the shape of a point. 4. Method according to claim I, characterized in that the above-mentioned projection has the shape of a mantle, with a thin wall, surrounding the base of the sign. 5. Dial according to claim II, obtained by the process according to claim I and sub-claim 1. 6.

Dial according to claim II, obtained by the process according to claim I and sub-claim 2. 7. Dial according to claim II, obtained. by the process according to claim I and sub-claim 3. 8. Dial according to claim II, obtained by the process according to claim I and sub-claim 4.