EP2866100A1 - Dichtung für Uhr - Google Patents

Dichtung für Uhr Download PDF

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Publication number
EP2866100A1
EP2866100A1 EP20130190372 EP13190372A EP2866100A1 EP 2866100 A1 EP2866100 A1 EP 2866100A1 EP 20130190372 EP20130190372 EP 20130190372 EP 13190372 A EP13190372 A EP 13190372A EP 2866100 A1 EP2866100 A1 EP 2866100A1
Authority
EP
European Patent Office
Prior art keywords
seal
tube
axial
overmolded
cover
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
EP20130190372
Other languages
English (en)
French (fr)
Other versions
EP2866100B1 (de
Inventor
Sébastien Briswalter
Jean Baebler
Christian Olvaszto
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.)
Meco SA
Original Assignee
Meco SA
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 Meco SA filed Critical Meco SA
Priority to CH01805/13A priority Critical patent/CH708743A2/fr
Priority to EP13190372.6A priority patent/EP2866100B1/de
Publication of EP2866100A1 publication Critical patent/EP2866100A1/de
Application granted granted Critical
Publication of EP2866100B1 publication Critical patent/EP2866100B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/10—Hermetic sealing of openings, joints, passages or slits of winding stems
    • 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
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/081—Complete encasings for wrist or pocket watches also comprising means for hermetic sealing of the winding stem and crown

Definitions

  • the present invention relates to a new type of seal for a timepiece, and more particularly to a screw-retained crown comprising such a seal.
  • the sealing of the moving parts relative to the fixed parts is guaranteed by means of a or more joints, whose elastic properties, geometric shape and spatial arrangement relative to other parts condition the quality of the seal.
  • the seals are generally made of elastomeric material and of flat and / or toric shape, in the latter case they are generally referred to as an O-ring type seal.
  • Such seals can be mounted directly on the tube, such as those illustrated for example on the crown of the patent EP1124167 , or inside a bonnet of a crown, such as the O-ring seal of the crown of the international application WO2012 / 168243 which is retained axially by a ring covering the bottom of the hood, commonly called deckring.
  • a known problem with O-rings relates to their susceptibility to pinching and their propensity to partially wrap around themselves according to the diameter of the torus when they undergo compressive or axial friction forces, which may result in their partial shearing. , or even total, and in any case greatly deteriorate the desired sealing properties.
  • quadrilobe joints have been introduced. Due to the increased number of points of contact between the seal and the contact faces of its housing, the reliability of the seal is increased, and in parallel, thanks to the reduction of the friction forces exerted on each of its points, the forces in torsion are also minimized and therefore robustness and increased service life.
  • a major advantage of a quadrilobe seal is not to exclusively present the joint plane directly in contact with the sealing surface.
  • the reliability of the sealing is improved the quadrilobe shape also allows to build small tanks of grease or oil (located in the hollows of the seal, ie between the lobes) in the case of a lubricated assembly and thus avoids at the joint premature aging due to lack of lubricant.
  • quadrilobe joints are relatively expensive because of their complexity of machining due to the particular geometrical shape to achieve.
  • they have a larger footprint O-rings of the minimum radius of each lobe made in the injection mold.
  • An object of the present invention is therefore to provide a solution for timepiece joints without the known limitations of O-rings, which is a reliable alternative to quadrilobic joints in terms of performance and in parallel does not generate substantial additional cost of production.
  • the subject of the invention is a waterproof timepiece, characterized in that it comprises an overmolded seal.
  • a first advantage of the proposed solution is that it significantly improves the sealing properties by removing the joint plane in the area to be sealed, unlike O-rings rings type.
  • the joint plane materializing the joint between two shells of a mold, is generally constituted by a median plane of the torus whose intersection with the torus is generally of annular section, whose inner diameters and exterior are in contact with bearing surfaces while the surface of the torus is not as smooth and clean in these places as on the rest of its outline.
  • Another advantage of the proposed solution is that it provides an increased flexibility in terms of room shape on which the overmolding operation can be performed, as well as the shape of the joint itself.
  • the molded seal can be made on any geometrical part, and the vulcanization process to make it a thickness, width or any other dimension wanted if necessary, which allows to move away from the conventional toroidal shape intended only for cylindrical parts.
  • Yet another advantage of the proposed solution is that it allows a gain in space both radial and axial, the thickness of the seal may be lower than in the case of a reported seal in a groove, and the housing less high.
  • the overmolded seal is disposed on the tube of a screwed crown designated by the general reference 1.
  • a piece such as a winding stem, a pusher pin, or any other element constituting a sealed piece intended to be mounted on a timepiece.
  • the logo L "Meco" of the plaintiff arranged on the outer face 113 of the cover 112 of its cover 11.
  • this logo L is intended for be adjusted in a perfectly horizontal position corresponding preferably to the plane of the middle part of the watch on which is mounted the crown.
  • a toothing D which aims to improve the grip of the crown 1 by the user during its use.
  • the figure 2 is a sagittal half-sectional view along the axis of rotation AA of the ring 1 which is shown in the unscrewed position commonly called "T1", on a threaded tube 10, intended to be screwed into a middle part of a watch case - not shown - by means of a first thread 101, while a thread 102 cooperates with the thread 21 a central barrel 2 of tubular form, integral with the cover 11.
  • the internal thread 102 of the tube 10 could, however, consist of a 2nd thread and the thread 21 of the central tube 2 may consist of a reciprocally tapping, as for a conventional crown screwed directly to the tube.
  • an internal threaded crown such as the proposed tapping 102, to protect the inside of the crown by a seal and thus minimize the risk of fouling and galling.
  • the cover 11 is formed by a cover 112 and an axial skirt 111, which mutually define a central opening 115 inside the ring forming the screwed element 1 and in which is disposed the end of the threaded tube 10 integral with the middle, but also the central barrel 2.
  • the central threaded barrel 2 consists of an intermediate element between the cover 11 of the crown 1 and the middle part of the watch and a rod (not shown, but conventionally mounted through the tapping 51 in a blind hole at the lower end of the piston 5) interacting with the movement.
  • the orientation of the central barrel 2 is always almost identical with respect to the tube 10, with the difference of the compression level of the overmoulded joint 4. Consequently, the angular orientation of the logo L is also always identical, by transitivity at the middle, in which the latter is also screwed via the first thread 101.
  • the piston 5 housed inside the central barrel 2 can slide against a spring 3 abuts on a central surface 1141 of the inner face 114 of the cover 112 of the cover 11, and allows in particular to bring out the hood 11 of the middle when unscrewing the crown 1 of the tube 2 during its use for the adjustment of a function (eg a time setting, date adjustment or manual winding of the movement, in different axial positions).
  • a function eg a time setting, date adjustment or manual winding of the movement, in different axial positions.
  • the axial stroke of the piston 5 along the axis AA of rotation of the ring 1 is limited by an abutment arranged at the bottom 2.
  • the piston 5 comes into abutment when the ring 1 is unscrewed from the tube 10, as shown in FIG. figure 4 described below.
  • the seal 4 is overmolded on an outer surface of the tube 10, and more particularly on a portion of the tube 10 situated above a shoulder 103 whose upper surface 1031 constitutes a radial bearing surface for the overmolded seal 4.
  • This bearing surface is preferably flat so as to cooperate optimally with a mold during an injection overmolding operation; nevertheless, this surface could also be notched with radial grooves in an alternative way to avoid any torsional detachment of overmolding during compression or relaxation of the compression.
  • the overmolding operation is also facilitated by the fact that the end of the tube 10 above the shoulder 103 is easily accessible, unlike any recessed shape in which the seals are generally arranged. Such an arrangement thus allows productivity gains.
  • the tube 10 also comprises a portion having a projecting profile 104, here in the form of a peripheral bead, which forms attachment surfaces 1041 for the axial retention of the overmolded elastomeric material.
  • This projecting profile 104 is preferably at half height H of the overmolded seal 4, so that the latter is disposed symmetrically on either side of the axial attachment surfaces 1041 and thus has isotropic compression properties.
  • the attachment surfaces 1041 are preferably oblique so as not to have too sharp angles, which would be detrimental to the adhesion of the seal to the tube during the overmolding operation.
  • the projecting profile could be replaced by a hollow profile in the form of, for example, a groove of revolution, while still advantageously always having axial attachment surfaces 1041 for the elastomer or any other thermoplastic material and / or thermosetting used to form the molded joint 4.
  • the advantage to use a projecting profile 104 is to minimize the supply of material for the seal therefore also its maximum compression level, that is to say the absolute maximum difference between the shapes of its contour 41 in the compressed position and resting.
  • the overmolded seal 4 has a thickness E which is substantially equal to the width of the shoulder 103 of the tube 10, so that the radial space is reduced to the maximum, unlike an O-ring type of seal a part substantially overflows from their homes.
  • the thickness E of the overmolded seal is preferably between 0.15 and 0.25 mm, and the height H of the seal, preferably between 0.3 and 0.4 mm mm. These dimensions are compared to O-ring type seal diameters of about 0.4 mm for crowns of similar size. Therefore, the space saving, calculated in proportion to the section sizes of the overmolded joint 4 with respect to a standard O-ring seal, is at least 15%, and can be up to more than 50%.
  • the overmolded seal 4 comprises dimensions preferably arranged so that a portion of its outer contour 41, or its radial peripheral portion, is flush with the inner surface 1111 of the axial skirt 111.
  • the lateral surface 1033 of the shoulder 103 makes directly facing the inner surface 1111 of the axial skirt 111, also vertical, with a minimum spacing to maintain properties sealing even in this work unscrewed T1 position where the cover 11 of the ring 1 is shifted by a first stroke C1 of about 0.75 millimeters, and at most one millimeter from the screwed position T0 where the seal overmoulded 4 is compressed and therefore the sealing properties of the crown 1 maximum.
  • a compression ring 6 having an oblique surface 61 is arranged at the level of the inner face 114 of the hood cover 11, the function of which is explained in the light of the figure 3 described below.
  • the figure 3 illustrates the same ring 1 according to a preferred embodiment than those of the preceding figures, but this time in its screwed position, that is to say the one in which the cover 11 is in its most proximal position relative to the tube 10 , commonly known as "T0" for a screwed crown.
  • T0 the most proximal position relative to the tube 10
  • the outer contour 4 of the seal follows not only the upper surface of the shoulder 1031, but now also the inner surface 1111 of the axial skirt 111 and the oblique face 61 of the compression ring 6.
  • the inner surface 1111 vertical axial skirt 111 faces the side wall 1033 of the shoulder, with a minimum gap the smallest possible, of the order of a few hundredths of a millimeter; however, from now on, the molded joint 4 is compressed so that the first and second lower surfaces 1112, 1032, respectively of the axial skirt 111 and of the shoulder 103 of the tube 10 are almost in line with one another. screwed position of the crown.
  • the end of the second internal thread 102 of the tube 10, which also constitutes an axial abutment for the cover 11 of the crown 1, can be similarly determined so as to confine the first lower surface 1112 of the cover 11 of the crown 1 in a position axial as close to the middle as the second lower surface 1032 of the shoulder of the tube 10 when the latter 10 is screwed through its first external thread 101.
  • the molded seal 4 is compressed almost exclusively axially and has a minimum remaining height h1 significantly less than the total height H of the overmoulded seal 4 at rest.
  • the maximum height h 2 deduced from the overmolded seal 4 in the compressed position which is equal to the difference between the total height H and this minimum remaining height h 1, depends inter alia on the orientation of the oblique surface 61 of the clamping ring 6 which according to a variant could come from material with the cover 11.
  • the oblique surface 61 is inclined by about 45 degrees; the more it is inclined vertically, the greater the ratio between the maximum height h2 deduced and the height at rest H of the overmolded seal 4, determining a compression ratio, will be large, especially for molded joints 4 whose section has a height H much higher to the thickness E. Conversely, the compression ratio of the seal will be lower for a sloping surface more horizontally. It may further be noted that according to the preferred embodiment illustrated, the inclination of the oblique surface 61 is identical to that of the upper attachment surface 1041, so that the upper part of the overmolded seal 4 is compressed relatively homogeneous between two parallel flat surfaces.
  • this gain in height is preferably greater than one tenth of a millimeter, which corresponds to a compression ratio h2 / H of more than 25%.
  • the figure 4 illustrates the screwed crown of the preceding figures but in the pulled position T2, that is to say where the stroke of the barrel 2 relative to the tube 10 is even greater than in position T1.
  • Most references are identical to those of Figures 1 to 3 they will not be explained again in detail; the only major difference between the figure 2 also showing the overmolded seal 4 in uncompressed position relates to the second stroke C2, corresponding to the distance between the first lower surface 1112 of the axial skirt 111 and the second lower surface 1032 of the shoulder 103 is preferably between 1, 5 and 2 millimeters, and is about twice the first race C1.
  • the inner surface 1111 of the axial skirt 111 remains in contact with the contour 41 of the overmoulded seal 4 in order to maintain the sealing properties of the crown 1
  • the material for producing the seal may preferably consist of an elastomer of NBR or HNBR type, and the overmolding operation may be carried out either directly by injection or by compression and vulcanization.
  • the overmolded seal 4 is overmolded preferably on a crown tube; according to a variant not illustrated, overmolding could however also be performed alternately in a crown head.
  • the choice to favor the tube as a molded object is nevertheless justified by the fact that the overmolding operation is facilitated by a simpler mold construction and access for the injection cannulas. Deburring and dimensional control are also easier than in the case of internal overmolding.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gasket Seals (AREA)
  • Closures For Containers (AREA)
EP13190372.6A 2013-10-25 2013-10-25 Dichtung für Uhr Active EP2866100B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH01805/13A CH708743A2 (fr) 2013-10-25 2013-10-25 Joint pour pièce d'horlogerie.
EP13190372.6A EP2866100B1 (de) 2013-10-25 2013-10-25 Dichtung für Uhr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13190372.6A EP2866100B1 (de) 2013-10-25 2013-10-25 Dichtung für Uhr

Publications (2)

Publication Number Publication Date
EP2866100A1 true EP2866100A1 (de) 2015-04-29
EP2866100B1 EP2866100B1 (de) 2017-05-24

Family

ID=49484213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13190372.6A Active EP2866100B1 (de) 2013-10-25 2013-10-25 Dichtung für Uhr

Country Status (2)

Country Link
EP (1) EP2866100B1 (de)
CH (1) CH708743A2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3287855A1 (de) * 2016-08-26 2018-02-28 Meco S.A. Einstellkrone für uhr
EP3321749A1 (de) * 2016-11-10 2018-05-16 Patek Philippe SA Genève Dichtungsfuge für uhrwerk

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH324258A (fr) * 1955-01-13 1957-09-15 Soguel Rene Dispositif de remontage étanche pour montre
FR1386681A (fr) * 1964-02-06 1965-01-22 Perfectionnement aux dispositifs de fermeture des boîtiers de pièces d'horlogerie et d'instruments similaires
EP0556155A1 (de) * 1992-02-12 1993-08-18 Montres Rolex Sa Wasserdichte Steuerungsvorrichtung für Uhren
EP0939351A1 (de) * 1998-02-27 1999-09-01 Biwi S.A. Verfahren zur Herstellung einer Dichtung
EP1124167A1 (de) 2000-02-08 2001-08-16 Boninchi S.A. Vorrichtung zum Ausrichten einer geschraubten Uhrkrone
WO2012168243A1 (fr) 2011-06-08 2012-12-13 Omega Sa Dispositif pour l'orientation d'un element visse d'une piece d'horlogerie

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH324258A (fr) * 1955-01-13 1957-09-15 Soguel Rene Dispositif de remontage étanche pour montre
FR1386681A (fr) * 1964-02-06 1965-01-22 Perfectionnement aux dispositifs de fermeture des boîtiers de pièces d'horlogerie et d'instruments similaires
EP0556155A1 (de) * 1992-02-12 1993-08-18 Montres Rolex Sa Wasserdichte Steuerungsvorrichtung für Uhren
EP0939351A1 (de) * 1998-02-27 1999-09-01 Biwi S.A. Verfahren zur Herstellung einer Dichtung
EP1124167A1 (de) 2000-02-08 2001-08-16 Boninchi S.A. Vorrichtung zum Ausrichten einer geschraubten Uhrkrone
WO2012168243A1 (fr) 2011-06-08 2012-12-13 Omega Sa Dispositif pour l'orientation d'un element visse d'une piece d'horlogerie

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3287855A1 (de) * 2016-08-26 2018-02-28 Meco S.A. Einstellkrone für uhr
JP2018031774A (ja) * 2016-08-26 2018-03-01 メコ・エス アー 計時器のためのセッティング用の竜頭
CN107783404A (zh) * 2016-08-26 2018-03-09 Meco有限公司 用于钟表的设定表冠
CN107783404B (zh) * 2016-08-26 2020-04-21 Meco有限公司 用于钟表的设定表冠
EP3321749A1 (de) * 2016-11-10 2018-05-16 Patek Philippe SA Genève Dichtungsfuge für uhrwerk

Also Published As

Publication number Publication date
EP2866100B1 (de) 2017-05-24
CH708743A2 (fr) 2015-04-30

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