EP0576965B1 - Pièce d'horlogerie - Google Patents

Pièce d'horlogerie Download PDF

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Publication number
EP0576965B1
EP0576965B1 EP93109920A EP93109920A EP0576965B1 EP 0576965 B1 EP0576965 B1 EP 0576965B1 EP 93109920 A EP93109920 A EP 93109920A EP 93109920 A EP93109920 A EP 93109920A EP 0576965 B1 EP0576965 B1 EP 0576965B1
Authority
EP
European Patent Office
Prior art keywords
stud
hole
base part
plate
shoulder
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
EP93109920A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0576965A1 (fr
Inventor
Friedrich Perrot
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 EP0576965A1 publication Critical patent/EP0576965A1/fr
Application granted granted Critical
Publication of EP0576965B1 publication Critical patent/EP0576965B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/008—Mounting, assembling of components
    • 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
    • G04B29/027—Materials and manufacturing

Definitions

  • the invention relates to a timepiece comprising a base piece of soft material, in particular plastic, and at least one element rigidly fixed on this base piece, and more particularly fixing means allowing the subjection of a multifunctional element, such as a bridge, on a basic plastic part, forming a plate, as shown in the preamble of claim 1.
  • a multifunctional element such as a bridge
  • the fixing means allowing the rigid securing of one piece on another must be as compact as possible so that the assembly obtained has the smallest possible footprint.
  • the assembly obtained must be reliable, and resist the tearing caused by strong stresses, while the basic part which forms the support is made of plastic material, or more generally of a material appreciably softer than brass, most traditional fixing methods cannot be used satisfactorily.
  • rivets are particularly suitable for assembly, in the context of mass production of timepieces. See also SWITZERLAND WATCHMAKING AND INTERNATIONAL REVIEW OF WATCHMAKING no. 3, March 1972, LA CHAUX-DE-FONDS (CH), p. 31-32, J.-C. SCHNEIDER, 'The use of synthetic materials in the Astrolon watch', which does not use riveting, but fixes the parts in synthetic material by a simple pin driven into the hole.
  • Another technique commonly used to fix an element on a basic plastic part uses studs which come in one piece with the basic part, in particular the plastic plate, and which normally protrude from the surface thereof. These studs are introduced into corresponding holes made in the element which it is desired to fix to the base part. Once the element thus placed in the desired position on said base piece, the free ends of the studs are plastically deformed, for example by means of an ultrasonic technique, to crush them and form a riveting of the plastic. Since the rivets produced by this technique are therefore made of plastic, the assemblies obtained also do not offer sufficient rigidity for certain applications.
  • An object of the present invention is to remedy the drawbacks of the prior art, which have just been described, by providing fastening means having a small footprint, which can be put in place in a plastic part, and making it possible to produce extremely rigid assemblies.
  • the invention relates to such a timepiece provided with fixing means comprising a lug, one of the ends of which is driven out or inserted into a hole in a piece of material. plastic and the other end of which is pressed against the element to be fixed to form a riveting.
  • the hole in the plastic part is shaped so as to allow access to the driven end (or inserted) of the post, by a tool, to form a support allowing the riveting of said post without the plastic part be subjected to harmful stresses.
  • a timepiece according to the invention will be described below, identified by the general reference H, and comprising a plate 1 represented by its outline schematically in broken dashed lines.
  • the timepiece H includes a multifunctional element 2 made of metal fixed to a base piece 1 formed in this example by the plate of an electronic movement.
  • the plate 1 which is made of a plastic material such as PPS or polycarbonate is preferably obtained by molding, while the bridge 2 is obtained by stamping from a sheet of thin thickness.
  • the plate 1 comprises two surfaces called upper 1a and lower 1b respectively, with reference to the position of plate 1 as shown in this figure, that is to say in position use, with the switch (not shown) facing upwards.
  • the functional element 2 is fixed to the plate 1, on its upper surface 1a, preferably by means of plastic studs, not shown, coming from the material with the plate 1 and forming a riveting with ultrasound at the level of two holes 4, and 6, and by a tenon (not shown) inserted at the level of the hole 8 provided in the element 2.
  • the element 2 could be fixed at these locations by another means known to those skilled in the art.
  • the multifunctional element 2 further comprises a hole 10 designed to receive a first end 12 (called upper end) of a fixing stud 34 shown in detail in FIG. 3, this stud 34 being intended to provide at this location a particularly rigid fixing of the element 2 on the part base or platinum 1 for reasons which will be understood below.
  • element 2 fulfills several functions. Among other things, the part of the bridge 2 referenced by 14 in FIG. 1 covers a coil (not shown) which is housed in a cavity (not shown) of the plate 1.
  • the element 2 also fulfills a function of electrical conductor, since 'It comprises a flange 16 intended to come into contact by a lateral support on the positive pole of a battery 18 ( Figure 3) which is housed in a cavity 19 ( Figure 3) formed in the plate 1.
  • the element 2 comprises two flanges 20 and 22 which are respectively connected to the quartz case (not shown) and to the positive terminal of an electronic module (likewise not shown) which are thus connected to the positive pole of the battery 18.
  • the element 2 comprises in addition an orifice 24 which is used for guiding a timer tenon, the element 2 therefore also forming a gear guide bridge.
  • the hole 24 is made in the center of a circular depression 26 of the deck 2.
  • the multifunctional element 2 further comprises a stopper of a rod 29 ( Figure 1), this stopper which carries the reference 28 consisting of a blade bent at 90 ° to the main plane of the multifunctional element 2 forming a bridge.
  • the stopper 28 is provided to collaborate at its end with circular grooves (not shown) of the rod 29 to ensure stable maintenance, in different positions, of the rod.
  • an arm 30 intended to allow the release of the rod 29.
  • a pressure is exerted on the release arm 30 in the direction of the arrow D (FIG. 2), there is a bending of the element 2 forming a bridge, in the region thereof situated between the release arm 30 and the hole 8. This bending allows the disengagement of the retainer 28, the circular grooves of the rod 29.
  • the rod 29 can slide freely to be removed from the part 1 or to be reintroduced therein, this operation being necessary each time it is desired to introduce the timepiece into a box or out of it.
  • the flange 16 is also close to the hole 24, and there is therefore also a risk of displacement of the hole 24, because of the pressure of the stack 18 on the flange 16.
  • particularly resistant fixing means are used to rigidly fix the element 2 forming a bridge to the plate 1, at the level of the hole 10, that is to say very close to the hole 24 for guiding the timer post.
  • These particularly rigid fixing means are the object of the present invention.
  • the fastening means comprise a stepped pin 34 which is anchored by a forced assembly or inserted for example by ultrasound, by a second end 40, called the lower end or driven , in a through hole 32 of the plate 1.
  • the stepped stud 34, and more particularly the anchoring end 40 comprises one or more circular grooves 36a into which penetrate one or more beads 36b, respectively, to increase the rigidity of the assembly.
  • the beads 36b are formed by plastic deformation of the plate 1, and in particular by creep of its material, during the mounting of the stud 34 in the hole 32.
  • the end 12 of the stud 34 forms a rivet head which is crushed against the bridge element 2 to form a riveting once the post 34 has been driven into the plate 1 and after the tool A has been put in place against the driven and through end 40 of the post 34.
  • the through hole 32 also comprises a recess or recess 35 formed in the lower surface 1a of the plate 1 and forming an enlarged hollowed area which is situated at its lower end. This configuration allows the lower driven end 40 of the stud 34 to open outwardly from this recess 35 without however projecting from the lower surface 1b of the plate 1, and thus authorizes access with a tool A, shown diagrammatically in the figure.
  • the tenon 34 preferably comprises at least one shoulder 41 formed by the upper edge of a part 42 of the tenon constituted by an adjoining bulge the rivet head 12, and having a larger diameter than that of the hole 10 of the bridge 2, the shoulder 41 constituting an axial support on which the bridge element 2 comes to rest here directly.
  • the bridge element 2 is clamped between the head of the rivet and the shoulder 41.
  • the post 34 may also have a second shoulder 43 formed by the lower edge of said enlarged portion or bulge 42 which thus constitutes a spacer which determines the spacing between the surface of the base element or plate 1 and the bridge 2 to 1. location of the fixing stud 34.
  • the presence of the shoulder 43 also makes it possible, as is the case in the embodiment shown, to use the stud 34 to also ensure the fixing of a second part 44 on the plate 1.
  • the part 44 which is for example constituted by a frame supporting cogs, not shown, is kept pinched between the shoulder 43 and the plate 1.
  • the through hole 32 and the recess 35 of the plastic base part 1 are preferably made during the molding of said base part 1.
  • the riveting operation is preferably carried out last, once the multifunctional part 2 is in place, resting on the surface 1a of the plate and on the shoulder 41 of the spacer 42.
  • a tool A is first put in place against the through end 40 of the stud 34 to provide the latter with a rigid support, then the upper end 12 of the stud 34 is crushed to form riveting.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Connection Of Plates (AREA)
  • Electromechanical Clocks (AREA)
EP93109920A 1992-06-30 1993-06-22 Pièce d'horlogerie Expired - Lifetime EP0576965B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2043/92 1992-06-30
CH2043/92A CH683582B5 (fr) 1992-06-30 1992-06-30 Pièce d'horlogerie comportant un élément fixé rigidement sur une pièce de base en matière plastique.

Publications (2)

Publication Number Publication Date
EP0576965A1 EP0576965A1 (fr) 1994-01-05
EP0576965B1 true EP0576965B1 (fr) 1996-09-04

Family

ID=4224611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109920A Expired - Lifetime EP0576965B1 (fr) 1992-06-30 1993-06-22 Pièce d'horlogerie

Country Status (9)

Country Link
US (1) US5430694A (enrdf_load_stackoverflow)
EP (1) EP0576965B1 (enrdf_load_stackoverflow)
JP (1) JP3248032B2 (enrdf_load_stackoverflow)
CN (1) CN1042265C (enrdf_load_stackoverflow)
CH (1) CH683582B5 (enrdf_load_stackoverflow)
DE (1) DE69304445T2 (enrdf_load_stackoverflow)
HK (1) HK1007606A1 (enrdf_load_stackoverflow)
SG (1) SG46996A1 (enrdf_load_stackoverflow)
TW (1) TW223166B (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69403612T2 (de) * 1993-11-23 1998-01-08 Ebauchesfabrik Eta Ag Uhr mit einer Vorrichtung zur Befestigung eines abnehmbaren Elementes an einen Träger und Verfahren zum Befestigen dieses Elementes an diesen Träger
CH687898B5 (de) * 1995-04-25 1997-09-30 Ebauchesfabrik Eta Ag Uhr mit einem elektrolumineszenten Zifferblatt.
TW538324B (en) * 2001-07-12 2003-06-21 Ebauchesfabrik Eta Ag Device for securing a dial in a watchcase
EP2595007B1 (fr) * 2011-11-17 2015-01-07 ETA SA Manufacture Horlogère Suisse Ensemble horloger avec centrage et fixation d'une platine par rapport à une carrure
CN113176727B (zh) * 2021-04-16 2022-07-22 深圳市沃特沃德信息有限公司 智能手表的主板固定架及智能手表

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH370708A (fr) * 1960-09-23 1963-03-29 D Ebauches De Bettlach S A Fab Procédé pour fabriquer une platine avec piliers et platine avec piliers obtenue par ce procédé
DE8025389U1 (de) * 1980-09-23 1987-01-15 Gebrüder Junghans GmbH, 7230 Schramberg Uhr-Werk mit Kunststoff-Trägerplatte

Also Published As

Publication number Publication date
CN1083940A (zh) 1994-03-16
JPH0666965A (ja) 1994-03-11
CH683582GA3 (fr) 1994-04-15
DE69304445D1 (de) 1996-10-10
TW223166B (enrdf_load_stackoverflow) 1994-05-01
DE69304445T2 (de) 1997-04-03
CH683582B5 (fr) 1994-10-14
SG46996A1 (en) 1998-03-20
JP3248032B2 (ja) 2002-01-21
US5430694A (en) 1995-07-04
EP0576965A1 (fr) 1994-01-05
CN1042265C (zh) 1999-02-24
HK1007606A1 (en) 1999-04-16

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