EP0770938A1 - Uhr mit Positioniermitteln für das Uhrwerk im Gehäuse und zur Ausrüstung einer solchen Uhr bestimmtes Gehäuse - Google Patents

Uhr mit Positioniermitteln für das Uhrwerk im Gehäuse und zur Ausrüstung einer solchen Uhr bestimmtes Gehäuse Download PDF

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Publication number
EP0770938A1
EP0770938A1 EP96116546A EP96116546A EP0770938A1 EP 0770938 A1 EP0770938 A1 EP 0770938A1 EP 96116546 A EP96116546 A EP 96116546A EP 96116546 A EP96116546 A EP 96116546A EP 0770938 A1 EP0770938 A1 EP 0770938A1
Authority
EP
European Patent Office
Prior art keywords
box
movement
stud
frame
housing
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.)
Granted
Application number
EP96116546A
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English (en)
French (fr)
Other versions
EP0770938B1 (de
Inventor
Kaelin Laurent
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
Priority to EP19960116546 priority Critical patent/EP0770938B1/de
Publication of EP0770938A1 publication Critical patent/EP0770938A1/de
Application granted granted Critical
Publication of EP0770938B1 publication Critical patent/EP0770938B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G04B37/00—Cases
    • G04B37/04—Mounting the clockwork in the case; Shock absorbing mountings
    • G04B37/05—Fixed mountings for pocket or wrist watches

Definitions

  • the present invention relates to a timepiece, in particular a wristwatch, comprising a horometric movement having an axis and a frame, a box formed by a middle part and a bottom constituting a housing for receiving said movement, means for axial positioning of the movement relative to the box by means of bearing surfaces which extend in a plane perpendicular to said axis in a peripheral region of said frame and said housing, and means for lateral positioning of the movement relative to the box.
  • This invention also relates to a box intended to equip such a timepiece.
  • the lateral positioning of a horometric movement in a box which is also called radial positioning, is in conventional constructions provided by an outer edge of the movement which is engaged in a peripheral bearing formed inside the box. This edge is often formed by a radial collar which also serves for the axial positioning of the movement.
  • time display means and in particular the hands in the case of an analog display, must be perfectly centered with respect to the covering, that is to say with respect to the ice-box assembly, and in particular with respect to the edge of the middle part.
  • timepieces of the chronograph watch type which include pushers in addition to the time setting crown
  • pushers in addition to the time setting crown
  • it is desired to limit the displacement stroke of the pushers it is understood that the precise positioning of the movement relative to the box must be able to be ensured.
  • this transverse positioning system has construction and mounting facilities and is suitable for cases where the case and / or the movement frame are molded parts, it does not avoid the aforementioned problem of differential expansions. In addition, it does not allow very precise positioning of the centering members, nor a machining of these members after their attachment to the box.
  • Patent CH 43503 provides for fixing a watch movement in its box by screwing the movement onto a threaded central stud which is integral with the bottom of the box, the lower part of the frame being provided with a fixed central nut.
  • the axial and lateral positioning is ensured by the cooperation of two complementary conical surfaces formed respectively on an upper collar of the movement and on the edge of the upper opening of the box.
  • the application of this system would require expensive machining of the conical surfaces at the periphery and would furthermore be incompatible with current methods of production by molding and automated assembly.
  • EP-A-64 950 describes a watch case having two elastomer studs on the bottom of the case, but these studs bear only axially against the movement, from which they are separated by lateral play.
  • the object of the present invention is to respond to the abovementioned drawbacks by providing a timepiece having a construction such that the movement can be mounted in the case in an easy, rapid manner and ensuring long-term high precision. lateral, without risk of subjecting the movement to stresses due to expansion.
  • This invention also aims to provide an inexpensive solution, in particular in certain applications, such as the case of injection molded boxes, and to avoid precise machining of centering surfaces having a large diameter.
  • the present invention also aims to provide a box responding to the above problem and able to equip such a timepiece.
  • the invention relates to a timepiece of the type indicated in the preamble, characterized in that said lateral positioning means are constituted by at least a pair of complementary elements of small size relative to the transverse dimensions. of the frame, said complementary elements being formed respectively on the bottom of the box and on a lower part of the frame, and in that one of said complementary elements is a centering orifice and the other is a protruding stud engaged by axial sliding in said orifice.
  • the invention has the effect of completely dissociating the axial positioning means and those of lateral positioning, to allow the latter to be produced at a location and in a form which allow machining to be both very precise and inexpensive.
  • the movement is positioned axially by pressing in a plane perpendicular to the axis, where it can have, if necessary, a lateral clearance allowing to absorb differential radial expansions between the case and the movement, as well as the manufacturing tolerances and mounting in any direction of said plane, that is to say in the directions of the large dimensions of the box and movement.
  • the flat axial support surfaces, arranged at the periphery have a large diameter ensuring good stability of the movement and their precise production is not expensive, in particular by molding.
  • the lateral positioning members can advantageously have an axial clearance, so that they hold the movement in the box only laterally, to prevent it from sliding on the plane of the axial support. They can be placed in the center of the timepiece or in the vicinity of this center, so that the centering is not affected by differential expansions or dimensional deviations due to the withdrawal of the molded parts. Thanks to their small diameter, they can be machined with precision at a lower cost than peripheral surfaces.
  • the stud protrudes from the bottom in the direction of the housing receiving the movement, while the centering orifice in which this stud engages is formed in said lower part of the frame.
  • a box intended to equip such a timepiece comprises a middle part and a bottom constituting a housing for receiving a movement, the box being characterized in that it comprises at least one cylindrical centering stud secured to said bottom and projecting from said bottom towards the housing, said stud being intended to position the movement laterally with respect to the box.
  • the stud is made in one piece with the bottom and also in the same material and is located in the center of the bottom.
  • FIGS. 1 and 2 a timepiece and a case according to the invention will be described below, said piece being identified here by the general reference 1.
  • the timepiece 1 comprises a box in particular of the monobloc type 2 formed by a middle part 4 and a bottom 6. On the box 2 are formed in the conventional manner horns 8 provided to allow the strands of a bracelet, not shown here.
  • a housing 10 which is defined inside this box by the middle part 4 and by the bottom 6, and more particularly by their respective inner walls referenced 4a and 6a.
  • the timepiece 1 further comprises a horometric movement 12 which is housed inside the housing 10.
  • This movement 12 having a central axis 13, comprises a frame 14 which is formed of an upper part 14a containing a bridge and a lower part 14b containing a plate.
  • the frame 14 conventionally supports mechanical, electrical and / or electromechanical members, driving display means 16 of digital or analog type, constituted in this example by two switches 16a and 16b.
  • the switch 16a is a switch in the center comprising hour, minute and second hands; the switch 16b is off-center and includes a needle, for example a chronograph.
  • the part 1 further comprises a lens 18 and a bezel 20 mounted in a notch in the middle part 4.
  • the glass 18 bears axially against a flange 22 which maintains the movement 12 by pressing in the same direction on the dial 24 which rests on the upper part 14a of the frame.
  • This upper part 14a has a peripheral shoulder forming an annular flat surface 25 which in turn rests against the flat surface 26 of a shoulder formed in the inner wall 4a of the middle part 4.
  • the enlarged upper part 14a of the frame plays the role of a snare or conventional thread, but only to ensure axial positioning.
  • the movement 12 can preferably benefit from lateral play in the plane 27 of these surfaces, which is perpendicular to the central axis 13. This makes it possible to absorb any expansion differential and increase manufacturing tolerances in the radial direction in the peripheral region of the case and movement.
  • the movement 12 also includes a battery 28 which is held in a suitable housing (not referenced) by a seal 30 secured to a cover 32.
  • the seal 30 and the cover 32 close a battery flap 34 formed in the bottom 6.
  • the cover 32 is engaged in the bottom 6 by a bayonet system 35.
  • the part 1 comprises lateral positioning means P ensuring the lateral (or radial) positioning of the movement 12 in and relative to the box 2. These positioning means P are formed between the bottom 6 and the lower part 14b of the frame 14.
  • these positioning means P are constituted, on the one hand, by a cylindrical stud 36 which projects from the bottom 6 towards the housing 10, and on the other hand, by an orifice centering 38 in which the stud 36 is engaged.
  • the centering orifice 38 is formed in the lower part 14b of the frame 14, for example along the central axis 13 of the movement, and it is formed directly during the injection of the frame 14 which is made of a plastic material.
  • This orifice 38 is thus obtained by a core suitably positioned in the injection mold (not shown). This configuration therefore makes it possible to guarantee obtaining very narrow tolerance ranges and perfect reproducibility of the shapes and dimensions, in comparison with the conventional positioning systems which were provided usually on the periphery of the upper part 14a.
  • the pad 36 is made in one piece with the bottom 6 and in the same material which is here metal. It should be noted that the box 2 is preferably produced by a metal injection process, called MIM (Metal Injection Molding).
  • MIM Metal Injection Molding
  • these positioning means being provided at the bottom of the box 2 offer a particularly advantageous solution because this injection process leaves, after its implementation, a core which is the cylinder of material which remains in the mold duct , just after removing the injection nozzle. To obtain the pad 36 according to the invention, this core is then machined, whereas previously it had to be eliminated in conventional constructions. We take advantage of this carrot to make the stud 36.
  • the same construction is advantageously applicable when the box 2 is molded in ceramic or other plastic material, or when it is not molded.
  • the pad 36 could also be a separate piece, attached to the bottom 6.
  • the diameter of the pad 36 and that of the orifice 38 are approximately 1.5 mm, while the largest diameter of the movement is commonly of the order of 18 to 30 mm.
  • the largest transverse dimension (diameter) of the stud 36 is smaller than one tenth of the largest transverse dimension (diameter) of the housing 10.
  • the stud 36 and the centering orifice 38 therefore have a small diameter compared to those of the movement 12 and of the housing 10.
  • the precise machining of the stud is therefore easier than that of the centering surface according to the prior art, with the periphery of the housing 10.
  • this stud 36 and this orifice 38 are in this example centered relative to the part 1, especially relative to the housing 10. This position has several advantages. It facilitates the precise positioning of the tool for machining the stud. It also facilitates the angular positioning of the movement during the casing, by allowing small pivotings around the center without the movement approaching the inner peripheral wall 4a.
  • the pushers of which are generally oriented in the direction of the center the stud 36 and the orifice 38 are precisely on the line of action of each pushbutton, so that this action does not tend to rotate the movement.
  • the movement can also be positioned angularly roughly during the fitting of the frame 14, by a projecting element of the frame 14, in this case a pin 40 engaged with a certain lateral clearance in a recess 42 formed in the peripheral wall. inner 4a of the middle part 4.
  • the finer angular positioning can then be done by a time setting rod 44 slidingly mounted in the middle part 4 and comprising a control crown 46.
  • the part shown in FIG. 1 further comprises a push-button 48 sliding in the same manner in the middle part 4 and capable of actuating a mechanical and / or electrical element of the movement 12, for example a chronograph device.
  • the invention is not limited to the embodiment shown. It could comprise two studs, not centered, engaged in two corresponding centering orifices, one of the orifices being of oblong shape to absorb the phenomena of expansion. In this case, the time setting rod 44 no longer has the function of angular positioning of the frame 14.
  • the stud 36 could be formed on the frame 14 to extend towards the bottom 6 and engage in an orifice made in this bottom. This solution is however less optimal, in particular because of the risks of deterioration of the stud at time of assembly. In addition, a stud projecting under the movement would interfere with the handling thereof during manufacture, testing and storage.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
EP19960116546 1995-10-27 1996-10-16 Uhr mit Positioniermitteln für das Uhrwerk im Gehäuse und zur Ausrüstung einer solchen Uhr bestimmtes Gehäuse Expired - Lifetime EP0770938B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19960116546 EP0770938B1 (de) 1995-10-27 1996-10-16 Uhr mit Positioniermitteln für das Uhrwerk im Gehäuse und zur Ausrüstung einer solchen Uhr bestimmtes Gehäuse

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CH303495 1995-10-27
CH3034/95 1995-10-27
CH303495 1995-10-27
EP96101320 1996-01-31
EP96101320 1996-01-31
EP19960116546 EP0770938B1 (de) 1995-10-27 1996-10-16 Uhr mit Positioniermitteln für das Uhrwerk im Gehäuse und zur Ausrüstung einer solchen Uhr bestimmtes Gehäuse

Publications (2)

Publication Number Publication Date
EP0770938A1 true EP0770938A1 (de) 1997-05-02
EP0770938B1 EP0770938B1 (de) 2000-02-16

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EP19960116546 Expired - Lifetime EP0770938B1 (de) 1995-10-27 1996-10-16 Uhr mit Positioniermitteln für das Uhrwerk im Gehäuse und zur Ausrüstung einer solchen Uhr bestimmtes Gehäuse

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1079284A1 (de) * 1999-08-24 2001-02-28 Eta SA Fabriques d'Ebauches Uhrwerk
EP1365295A2 (de) * 2002-05-20 2003-11-26 Seiko Instruments Inc. Tragbares elektronisches Gerät
WO2014173582A1 (fr) * 2013-04-24 2014-10-30 Eta Sa Manufacture Horlogère Suisse Procede et dispositif d'assemblage d'un mouvement a un boitier de montre

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH43503A (fr) * 1908-05-27 1909-05-17 Piquerez Sa Ervin Dispositif de fixation et d'ajustement d'un mouvement de montre dans sa boîte
EP0064950A1 (de) * 1981-05-01 1982-11-17 Montres Rado S.A. Wasserdichtes Uhrgehäuse

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH43503A (fr) * 1908-05-27 1909-05-17 Piquerez Sa Ervin Dispositif de fixation et d'ajustement d'un mouvement de montre dans sa boîte
EP0064950A1 (de) * 1981-05-01 1982-11-17 Montres Rado S.A. Wasserdichtes Uhrgehäuse

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1079284A1 (de) * 1999-08-24 2001-02-28 Eta SA Fabriques d'Ebauches Uhrwerk
EP1365295A2 (de) * 2002-05-20 2003-11-26 Seiko Instruments Inc. Tragbares elektronisches Gerät
EP1365295A3 (de) * 2002-05-20 2004-11-03 Seiko Instruments Inc. Tragbares elektronisches Gerät
WO2014173582A1 (fr) * 2013-04-24 2014-10-30 Eta Sa Manufacture Horlogère Suisse Procede et dispositif d'assemblage d'un mouvement a un boitier de montre
US9886004B2 (en) 2013-04-24 2018-02-06 Eta Sa Manufacturing Horlogere Suisse Method and device for assembling a movement to a watch case

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Publication number Publication date
EP0770938B1 (de) 2000-02-16

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