EP0907116B1 - Device for fastening an element to the back cover of a case - Google Patents
Device for fastening an element to the back cover of a case Download PDFInfo
- Publication number
- EP0907116B1 EP0907116B1 EP19970117035 EP97117035A EP0907116B1 EP 0907116 B1 EP0907116 B1 EP 0907116B1 EP 19970117035 EP19970117035 EP 19970117035 EP 97117035 A EP97117035 A EP 97117035A EP 0907116 B1 EP0907116 B1 EP 0907116B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stud
- securing device
- cover
- case
- securing
- 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
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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
- G04B29/00—Frameworks
- G04B29/02—Plates; Bridges; Cocks
Definitions
- the present invention relates to a device for fixing a part to the bottom of a case, in particular such a device allowing the fixing of a piece to the bottom of a case comprising a cover.
- the housing comprises at least one plastic pad which projects from the bottom and the part to be fixed has at least one substantially planar part provided with an orifice having an axis substantially perpendicular to the bottom and in which the plot is introduced.
- the part is fixed in the bottom of the housing using an ultrasonic welding machine using a sonotrode. The sonotrode comes into contact with the head of the stud which protrudes from the orifice and transmits energy to the head of the stud to bring the material of this head into fusion to carry out a welding or a kind of riveting.
- this process has many drawbacks. Indeed, the implementation of this process requires the use of complex and expensive welding machines. Furthermore, the quality of the weld is difficult to control with such a process in that it frequently appears, after some time of use, microcracks in the sonotrode, these microcracks having a detrimental effect on the quality of the weld. Indeed, these microcracks lead to a non-uniform distribution of the energy transmitted by the sonotrode which generally results in an incomplete fusion of the pad or a defect in geometry of the head of the molten pad and consequently a defective weld or even a weld not fixing the part reliably on the stud.
- the main object of the invention is therefore to remedy the drawbacks of the above-mentioned prior art by providing a device for fixing a part on a bottom of a case such as an electric micromotor case, which is reliable, simple, economical and in particular which does not require a delicate welding operation.
- the invention relates to a device for fixing at least one part on the bottom of a housing comprising at least one stud which projects from said bottom, said part having at least one substantially flat part provided with '' an orifice having an axis substantially perpendicular to said bottom and into which said pad is inserted, characterized in that said pad comprises a deformable distal part, in that the housing further comprises a cover provided, on its face directed towards the bottom of the housing, means complementary to said stud for, in a position for closing the cover, applying and maintaining said flat part on a bearing surface provided in the region of said bottom, and means for locking the cover on said housing, and in this that said complementary means are configured to produce a deformation of said distal part towards the outside so that said distorted distal part of said stud is interposed between said flat part and said complementary means.
- the simple operation of closing and locking the cover on the housing allows the distal part of the stud to be deformed and a secure attachment of the part to the bottom of the case, this operation being carried out without the use of a welding machine.
- the distal part is formed of a plurality of lamellae arranged in a corolla. This allows this part of the stud to be deformed by folding with a low force, which facilitates fixing when the cover is closed. Furthermore, the deformation by folding of the strips generates an elastic return force in the axial direction, that is to say parallel to the geometric axis of the stud, on the protruding part, which allows, if necessary, compensation a clearance which could appear between the protruding part, the flat part of the part to be fixed and the bearing surface of the housing, for example as a result of thermal expansion.
- FIG. 1 an embodiment of a device for fixing at least one part in the bottom of a housing according to the invention, the device 1 being shown before fixing the part or parts in question.
- the device 1 allows the attachment of two parts 2, 4, respectively a stator and a coil of an electric micromotor fitted into a housing 6 comprising a base plate 8, defining a bottom 10, and a cover 12.
- the stator 2, the coil 4 and the housing 6 are partially shown in section in FIG. 1.
- the stator 2 and the coil 4 each comprise a substantially planar part 14, 16 provided with a respective orifice 18, 20 having an axis AA substantially perpendicular to the bottom 10.
- the bottom 10 comprises a stud 22 which projects perpendicularly from the latter. This bottom 10 further comprises a bearing surface 24 located substantially in the vicinity of the stud 22.
- the orifices 18, 20 are placed on the stud 22 so that the flat part 14 of the stator 2 rests directly on this surface 24 while the flat part 16 of the coil 4 rests on the surface 24 by l 'through the flat part 14.
- the bottom 10 and the cover 12 are each extended by respective side walls 26, 28 which can be engaged and locked one on the other in a closed position of the housing 6 ( Figure 2).
- the locking of the cover 12 on the bottom 18 is advantageously achieved by a conventional snap-in device E.
- the stud 22 comprises a distal distal part 22a and the cover 12 comprises, on its face 30 directed towards the bottom 10 of the housing 8, complementary means 32 to the stud 22 for, in the closed position of the housing 8 , produce a deformation of the distal part 22a in a radial direction - symbolized by an arrow R in the figure - outwards from the center of the stud 22, so that part of the material of this distal part s' interposed between the element or elements to be fixed in the bottom of the housing, in particular between the flat part 16 of the coil, and the means 32.
- the deformable distal part 22a is hollowed out at its center and comprises at its periphery a plurality of strips 34 arranged in a corolla.
- the lamellae 34 are spaced from each other by regular intervals.
- the number of strips is between 2 and 6 and is preferably 4.
- the strips are advantageously elastically deformable so that they can exert an axial restoring force towards the cover and thus hold the stator and the coil against the bearing surface 24 with almost zero play.
- the complementary means 32 comprise a rigid support element 36 which projects from the face 30 of the cover and which is arranged substantially opposite the stud 22 with which it is associated.
- the support element 36 has an end face which comprises in its part opposite the stud 22, more particularly opposite the strips 34, a frustoconical part 38 which makes it possible to facilitate the spacing of the strips 34 in the radial direction R during the closing of the box 8 by the cover 18.
- the frustoconical part 38 can, according to an alternative embodiment, be replaced by a V-shaped part, for example when the distal part 22a only comprises two lamellas 34 diametrically opposite.
- a person skilled in the art will choose the most appropriate shape as a function of the geometrical arrangement of the strips 34, it being understood that this shape will facilitate the deformation in the radial direction R, towards the outside, of the strips 34.
- the frusto-conical part 38 or where appropriate the V-shaped part, extends radially outwards by a annular surface 40 substantially flat and parallel to the flat part 16 of the coil 4.
- the housing 8 and the cover 12 can be made of a synthetic material such as for example Crastin® or, where appropriate, a metallic material, for example Durimphy®. In both cases, these elements will preferably be obtained directly by molding, the stud 22 and the support surface 2 coming from one piece with the bottom, and the support element 36 coming from one piece with the cover.
- the number of studs 22 and complementary means 36 is not limited and may vary in particular depending on the shape and nature of the elements to be fixed.
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- General Physics & Mathematics (AREA)
- Motor Or Generator Frames (AREA)
Description
La présente invention concerne un dispositif de fixation d'une pièce sur le fond d'un boîtier, en particulier un tel dispositif permettant la fixation d'une pièce sur le fond d'un boîtier comprenant un couvercle..The present invention relates to a device for fixing a part to the bottom of a case, in particular such a device allowing the fixing of a piece to the bottom of a case comprising a cover.
On connaît déjà des dispositifs de fixation d'au moins une pièce, telle qu'un stator d'un micromoteur pas-à-pas, sur le fond d'un boîtier (FR-A-2 312 056). Selon cet art antérieur, le boîtier comprend au moins un plot en matière plastique qui fait saillie à partir du fond et la pièce à fixer présente au moins une partie sensiblement plane munie d'un orifice ayant un axe sensiblement perpendiculaire au fond et dans lequel le plot est introduit. Dans ces dispositifs, la fixation de la pièce dans le fond du boîtier est réalisée à l'aide d'une machine de soudage aux ultrasons à l'aide d'une sonotrode. La sonotrode vient en contact avec la tête du plot qui dépasse de l'orifice et transmet l'énergie à la tête du plot pour amener la matière de cette tête en fusion pour réaliser un soudage ou une espèce de rivetage.Devices for fixing at least one part are already known, such as a stator of a stepping micromotor, on the bottom of a housing (FR-A-2 312 056). According to this prior art, the housing comprises at least one plastic pad which projects from the bottom and the part to be fixed has at least one substantially planar part provided with an orifice having an axis substantially perpendicular to the bottom and in which the plot is introduced. In these devices, the part is fixed in the bottom of the housing using an ultrasonic welding machine using a sonotrode. The sonotrode comes into contact with the head of the stud which protrudes from the orifice and transmits energy to the head of the stud to bring the material of this head into fusion to carry out a welding or a kind of riveting.
Ce procédé présente toutefois de nombreux inconvénients. En effet, la mise en oeuvre de ce procédé nécessite l'utilisation de machines de soudage complexes et coûteuses. Par ailleurs, la qualité de la soudure est difficilement contrôlable avec un tel procédé en ce qu'il apparait fréquemment, après quelques temps d'utilisation, des microfissures dans la sonotrode, ces microfissures ayant un effet néfaste sur la qualité de la soudure. En effet, ces microfissures conduisent à une répartition non uniforme de l'énergie transmise par la sonotrode ce qui entraîne généralement une fusion incomplète du plot ou un défaut de géométrie de la tête du plot fondu et par conséquent une soudure défectueuse ou encore à une soudure ne fixant pas la pièce de façon fiable sur le plot. A cela s'ajoute le fait que ces microfissures ne sont pas détectables à l'oeil nu, de sorte qu'il est difficile de prévoir et de contrôler à l'avance la qualité des soudures qui seront obtenues. Ce procédé de soudage est en outre très dépendant du matériau dont est réalisé le plot et nécessite par conséquent une mise au point longue et coûteuse à chaque changement de matière.However, this process has many drawbacks. Indeed, the implementation of this process requires the use of complex and expensive welding machines. Furthermore, the quality of the weld is difficult to control with such a process in that it frequently appears, after some time of use, microcracks in the sonotrode, these microcracks having a detrimental effect on the quality of the weld. Indeed, these microcracks lead to a non-uniform distribution of the energy transmitted by the sonotrode which generally results in an incomplete fusion of the pad or a defect in geometry of the head of the molten pad and consequently a defective weld or even a weld not fixing the part reliably on the stud. To that Added to this is the fact that these microcracks are not detectable with the naked eye, so that it is difficult to predict and control in advance the quality of the welds which will be obtained. This welding process is also very dependent on the material from which the stud is made and therefore requires a long and costly development at each change of material.
L'invention a donc pour but principal de remédier aux inconvénients de l'art antérieur susmentionné en fournissant un dispositif de fixation d'une pièce sur un fond d'un boitier tel qu'un boîtier de micromoteur électrique, qui soit fiable, simple, économique et en particulier qui ne requiert pas d'opération de soudage délicate.The main object of the invention is therefore to remedy the drawbacks of the above-mentioned prior art by providing a device for fixing a part on a bottom of a case such as an electric micromotor case, which is reliable, simple, economical and in particular which does not require a delicate welding operation.
A cet effet l'invention a pour objet un dispositif de fixation d'au moins une pièce sur le fond d'un boîtier comprenant au moins un plot qui fait saillie à partir dudit fond, ladite pièce ayant au moins une partie sensiblement plane munie d'un orifice ayant un axe sensiblement perpendiculaire audit fond et dans lequel ledit plot est introduit, caractérisé en ce que ledit plot comprend une partie distale déformable, en ce que le boîtier comprend en outre un couvercle muni, sur sa face dirigée vers le fond du boîtier, de moyens complémentaires audit plot pour, dans une position de fermeture du couvercle, appliquer et maintenir ladite partie plane sur une surface d'appui prévue dans la région dudit fond, et des moyens de blocage du couvercle sur ledit boîtier, et en ce que lesdits moyens complémentaires sont configurés pour produire une déformation de ladite partie distale vers l'extérieur de sorte que ladite partie distale déformées dudit plot s'interpose entre ladite partie plane et lesdits moyens complémentaires.To this end the invention relates to a device for fixing at least one part on the bottom of a housing comprising at least one stud which projects from said bottom, said part having at least one substantially flat part provided with '' an orifice having an axis substantially perpendicular to said bottom and into which said pad is inserted, characterized in that said pad comprises a deformable distal part, in that the housing further comprises a cover provided, on its face directed towards the bottom of the housing, means complementary to said stud for, in a position for closing the cover, applying and maintaining said flat part on a bearing surface provided in the region of said bottom, and means for locking the cover on said housing, and in this that said complementary means are configured to produce a deformation of said distal part towards the outside so that said distorted distal part of said stud is interposed between said flat part and said complementary means.
Grâce à ces caractéristiques, la simple opération de fermeture et de blocage du couvercle sur le boîtier, par exemple par encliquetage, permet la déformation de la partie distale du plot et une fixation sûre de la pièce au fond du boîtier, cette opération étant réalisée sans l'utilisation d'une machine de soudage.Thanks to these characteristics, the simple operation of closing and locking the cover on the housing, for example by snap-fastening, allows the distal part of the stud to be deformed and a secure attachment of the part to the bottom of the case, this operation being carried out without the use of a welding machine.
Selon un mode de réalisation avantageux, la partie distale est formée d'une pluralité de lamelles disposées en corolle. Ceci permet de déformer cette partie du plot par pliage avec une faible force, ce qui facilite la fixation lors de la fermeture du couvercle. Par ailleurs, la déformation par pliage des lamelles engendre une force élastique de rappel en direction axiale, c'est-à-dire parallèle à l'axe géométrique du plot, sur la partie proéminente, ce qui permet, le cas échéant, une compensation d'un jeu qui pourrait apparaître entre la partie proéminente, la partie plane de la pièce à fixer et la surface d'appui du boîtier, par exemple par suite d'une dilatation thermique.According to an advantageous embodiment, the distal part is formed of a plurality of lamellae arranged in a corolla. This allows this part of the stud to be deformed by folding with a low force, which facilitates fixing when the cover is closed. Furthermore, the deformation by folding of the strips generates an elastic return force in the axial direction, that is to say parallel to the geometric axis of the stud, on the protruding part, which allows, if necessary, compensation a clearance which could appear between the protruding part, the flat part of the part to be fixed and the bearing surface of the housing, for example as a result of thermal expansion.
D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à lecture de la description suivante d'un mode de réalisation de l'invention donné à titre purement illustratif et non limitatif, cette description étant faite en liaison avec les dessins dans lesquels:
- les figures 1 et 2 sont des représentations schématiques en coupe d'un dispositif de fixation d'une pièce dans le fond d'un boitier, respectivement avant et après la fixation de ladite pièce.
- Figures 1 and 2 are schematic sectional representations of a device for fixing a part in the bottom of a housing, respectively before and after the fixing of said part.
La description de l'invention va être faite dans le cadre d'une application à la fixation d'un stator et d'une bobine d'un micromoteur dans le fond d'un boîtier fermé par un couvercle, toutefois il va de soi que l'invention n'est nullement limitée à cette application et qu'elle pourra être avantageusement utilisée dans le cadre de toute autre application dans laquelle on a besoin de fixer une pièce dans le fond d'un boîtier, notamment fermé par un couvercle.The description of the invention will be made in the context of an application to the attachment of a stator and a coil of a micromotor in the bottom of a housing closed by a cover, however it goes without saying that the invention is in no way limited to this application and that it can be advantageously used in the context of any other application in which there is a need to fix a part in the bottom of a case, in particular closed by a cover.
En se référant tout d'abord à la figure 1 on voit, désigné par la référence générale 1, un mode réalisation d'un dispositif de fixation d'au moins une pièce dans le fond d'un boitier selon l'invention, le dispositif 1 étant représenté avant la fixation de la pièce ou des pièces en question. Dans l'exemple de réalisation représenté, le dispositif 1 permet la fixation de deux pièces 2, 4, respectivement un stator et une bobine d'un micromoteur électrique emboité dans un boîtier 6 comprenant une plaque de base 8, définissant un fond 10, et un couvercle 12. Le stator 2, la bobine 4 ainsi que le boîtier 6 sont partiellement représentés en coupe à la figure 1. Le stator 2 et la bobine 4 comprennent chacun une partie sensiblement plane 14, 16 munie d'un orifice respectif 18, 20 ayant un axe A-A sensiblement perpendiculaire au fond 10.Referring first to Figure 1 we see, designated by the general reference 1, an embodiment of a device for fixing at least one part in the bottom of a housing according to the invention, the device 1 being shown before fixing the part or parts in question. In the embodiment shown, the device 1 allows the attachment of two parts 2, 4, respectively a stator and a coil of an electric micromotor fitted into a housing 6 comprising a base plate 8, defining a bottom 10, and a cover 12. The stator 2, the coil 4 and the housing 6 are partially shown in section in FIG. 1. The stator 2 and the coil 4 each comprise a substantially planar part 14, 16 provided with a respective orifice 18, 20 having an axis AA substantially perpendicular to the bottom 10.
Le fond 10 comprend un plot 22 qui fait saillie perpendiculairement à partir de ce dernier. Ce fond 10 comprend en outre une surface d'appui 24 située sensiblement au voisinage du plot 22.The bottom 10 comprises a stud 22 which projects perpendicularly from the latter. This bottom 10 further comprises a bearing surface 24 located substantially in the vicinity of the stud 22.
Dans l'exemple représenté, les orifices 18, 20 sont placés sur le plot 22 de sorte que la partie plane 14 du stator 2 repose directement sur cette surface 24 tandis que la partie plane 16 de la bobine 4 repose sur la surface 24 par l'intermédiaire de la partie plane 14.In the example shown, the orifices 18, 20 are placed on the stud 22 so that the flat part 14 of the stator 2 rests directly on this surface 24 while the flat part 16 of the coil 4 rests on the surface 24 by l 'through the flat part 14.
Le fond 10 et le couvercle 12 sont prolongés chacun par des parois latérales respectives 26, 28 qui peuvent être engagées et bloquées l'une sur l'autre dans une position de fermeture du boîtier 6 (figure 2). Le blocage du couvercle 12 sur le fond 18 est réalisé de façon avantageuse par un dispositif à encliquetage E classique.The bottom 10 and the cover 12 are each extended by respective side walls 26, 28 which can be engaged and locked one on the other in a closed position of the housing 6 (Figure 2). The locking of the cover 12 on the bottom 18 is advantageously achieved by a conventional snap-in device E.
Selon l'invention, le plot 22 comprend une partie distale 22a déformable et le couvercle 12 comprend, sur sa face 30 dirigée vers le fond 10 du boîtier 8, des moyens complémentaires 32 au plot 22 pour, dans la position de fermeture du boîtier 8, produire une déformation de la partie distale 22a dans une direction radiale - symbolisée par une flèche R à la figure - vers l'extérieur à partir du centre du plot 22, de sorte qu'une partie de la matière de cette partie distale s'interpose entre le ou les éléments à fixer dans le fond du boîtier, en particulier entre la partie plane 16 de la bobine, et les moyens complémentaires 32. Il en résulte une application et un maintien ferme de la partie plane 16 contre la surface d'appui 24, en l'occurrence par l'intermédiaire de la partie plane 14 du stator 2.According to the invention, the stud 22 comprises a distal distal part 22a and the cover 12 comprises, on its face 30 directed towards the bottom 10 of the housing 8, complementary means 32 to the stud 22 for, in the closed position of the housing 8 , produce a deformation of the distal part 22a in a radial direction - symbolized by an arrow R in the figure - outwards from the center of the stud 22, so that part of the material of this distal part s' interposed between the element or elements to be fixed in the bottom of the housing, in particular between the flat part 16 of the coil, and the means 32. This results in an application and a firm hold of the flat part 16 against the bearing surface 24, in this case by means of the flat part 14 of the stator 2.
Dans le mode de réalisation représenté, la partie distale déformable 22a est évidée en son centre et comprend à sa périphérie une pluralité de lamelles 34 disposées en corolle. On notera que dans l'exemple représenté les lamelles 34 sont espacées les unes des autres par des intervalles réguliers. De façon avantageuse, le nombre de lamelles est compris entre 2 et 6 et est de préférence 4. Les lamelles sont avantageusement déformables élastiquement de sorte qu'elles peuvent exercer une force de rappel axiale en direction du couvercle et maintenir ainsi le stator et la bobine contre la surface d'appui 24 avec un jeu quasi nul.In the embodiment shown, the deformable distal part 22a is hollowed out at its center and comprises at its periphery a plurality of strips 34 arranged in a corolla. Note that in the example shown the lamellae 34 are spaced from each other by regular intervals. Advantageously, the number of strips is between 2 and 6 and is preferably 4. The strips are advantageously elastically deformable so that they can exert an axial restoring force towards the cover and thus hold the stator and the coil against the bearing surface 24 with almost zero play.
Les moyens complémentaires 32 comprennent un élément d'appui 36 rigide qui fait saillie à partir de la face 30 du couvercle et qui est disposé sensiblement en regard du plot 22 auquel il est associé. L'élément d'appui 36 présente une face d'extrémité qui comporte dans sa partie en regard du plot 22, plus particulièrement en regard des lamelles 34, une partie tronconique 38 qui permet de faciliter l'écartement des lamelles 34 dans la direction radiale R au cours de la fermeture du boîtier 8 par le couvercle 18.The complementary means 32 comprise a rigid support element 36 which projects from the face 30 of the cover and which is arranged substantially opposite the stud 22 with which it is associated. The support element 36 has an end face which comprises in its part opposite the stud 22, more particularly opposite the strips 34, a frustoconical part 38 which makes it possible to facilitate the spacing of the strips 34 in the radial direction R during the closing of the box 8 by the cover 18.
Il va de soi que la partie tronconique 38 peut, selon une variante de réalisation, être remplacée par une partie en forme de V, par exemple lorsque la partie distale 22a ne comprend que deux lamelles 34 diamétralement opposées. L'homme du métier choisira la forme la plus appropriée en fonction de la disposition géométrique des lamelles 34, étant entendu que cette forme facilitera la déformation dans la direction radiale R, vers l'extérieur, des lamelles 34.It goes without saying that the frustoconical part 38 can, according to an alternative embodiment, be replaced by a V-shaped part, for example when the distal part 22a only comprises two lamellas 34 diametrically opposite. A person skilled in the art will choose the most appropriate shape as a function of the geometrical arrangement of the strips 34, it being understood that this shape will facilitate the deformation in the radial direction R, towards the outside, of the strips 34.
On notera également à ce propos que la partie de forme tronconique 38, ou le cas échéant la partie en forme de V, se prolonge radialement vers l'extérieur par une surface 40 annulaire sensiblement plane et parallèle à la partie plane 16 de la bobine 4.It will also be noted in this connection that the frusto-conical part 38, or where appropriate the V-shaped part, extends radially outwards by a annular surface 40 substantially flat and parallel to the flat part 16 of the coil 4.
Le boîtier 8 et le couvercle 12 peuvent être réalisés en un matériau synthétique tel que par exemple le Crastin® ou le cas échéant en un matériau métallique, par exemple le Durimphy®. Dans les deux cas, ces éléments seront obtenus, de préférence, directement par moulage, le plot 22 et la surface d'appui 2 venant de matière avec le fond, et l'élément d'appui 36 venant de matière avec le couvercle.The housing 8 and the cover 12 can be made of a synthetic material such as for example Crastin® or, where appropriate, a metallic material, for example Durimphy®. In both cases, these elements will preferably be obtained directly by molding, the stud 22 and the support surface 2 coming from one piece with the bottom, and the support element 36 coming from one piece with the cover.
Les matériaux qui viennent d'être mentionnés ci-dessus peuvent bien entendu être remplacés par d'autres matériaux pouvant offrir notamment des caractéristiques de déformation et d'élasticité suffisantes pour former la partie distale déformable 22a.The materials which have just been mentioned above can of course be replaced by other materials which can in particular offer sufficient deformation and elasticity characteristics to form the deformable distal part 22a.
Il va de soi que le nombre de plots 22 et de moyens 36 complémentaires n'est pas limité et pourra varier notamment en fonction de la forme et de la nature des éléments à fixer.It goes without saying that the number of studs 22 and complementary means 36 is not limited and may vary in particular depending on the shape and nature of the elements to be fixed.
Claims (9)
- Device for securing at least one part onto the bottom of a case including at least one stud which projects from said bottom, said part having at least one substantially flat portion provided with an orifice having an axis substantially perpendicular to said bottom and into which said stud is introduced, characterised in that said stud includes a distal portion able to be deformed, in that the case further includes a cover provided, on the face thereof which is directed towards the bottom of said case, complementary means to said stud for, in a closed position of the cover, applying and holding said flat portion onto a support surface provided in the region of said bottom, and means for blocking the cover onto said case, and in that said complementary means are shaped for generating deformation of said distal portion outwards so that said deformed distal portion of said stud is inserted between said flat portion and said complementary means.
- Securing device according to claim 1, characterised in that said distal portion is formed of a plurality of thin sheets arranged in corolle.
- Securing device according to claim 1 or 2, characterised in that said complementary means include for each stud a support element projecting from said face of the cover, said support element being arranged facing the stud with which it is associated.
- Securing device according to claims 2 and 3, characterised in that said support element includes on its end face facing said stud, a truncated or V shaped portion for causing the spacing outwards of said thin sheets.
- Securing device according to claim 4, characterised in that said truncated or V shaped portion extends radially outwards by a substantially flat surface parallel to said flat portion of said part.
- Securing device according to any of claims 2 to 5, characterised in that said thin sheets are able to be deformed elastically.
- Securing device according to any of claims 2, 3, when it depends on claim 2, 4 and 5, characterised in that said thin sheets are separated from each other.
- Securing device according to any of the preceding claims, characterised in that said stud is made of a synthetic material.
- Use of the securing device according to any of the preceding claims, for securing a stack comprising the stator and the coil of an electric motor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19970117035 EP0907116B1 (en) | 1997-10-01 | 1997-10-01 | Device for fastening an element to the back cover of a case |
| DE69718788T DE69718788D1 (en) | 1997-10-01 | 1997-10-01 | Device for fastening a part on a housing base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19970117035 EP0907116B1 (en) | 1997-10-01 | 1997-10-01 | Device for fastening an element to the back cover of a case |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0907116A1 EP0907116A1 (en) | 1999-04-07 |
| EP0907116B1 true EP0907116B1 (en) | 2003-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19970117035 Expired - Lifetime EP0907116B1 (en) | 1997-10-01 | 1997-10-01 | Device for fastening an element to the back cover of a case |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0907116B1 (en) |
| DE (1) | DE69718788D1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW494284B (en) | 2000-11-29 | 2002-07-11 | Ebauchesfabrik Eta Ag | Stacked assembly of a plurality of modules forming an electronic or electromechanical device, in particular for an ultra-thin timepiece |
| ATE478364T1 (en) * | 2000-11-29 | 2010-09-15 | Eta Sa Mft Horlogere Suisse | ASSEMBLY OF AN ELECTROMAGNETIC DEVICE BY STACKING SEVERAL MODULES, ESPECIALLY FOR AN EXTREMELY THIN CLOCK MOVEMENT |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51137451A (en) * | 1975-05-23 | 1976-11-27 | Seikosha Co Ltd | Timepiece |
-
1997
- 1997-10-01 DE DE69718788T patent/DE69718788D1/en not_active Expired - Lifetime
- 1997-10-01 EP EP19970117035 patent/EP0907116B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69718788D1 (en) | 2003-03-06 |
| EP0907116A1 (en) | 1999-04-07 |
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