• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to an oscillating mass comprising a central piece (2) of metal and a peripheral piece (4) of heavy metal, integral with the central piece (2). According to the invention, the peripheral piece (4) is crimped to the central piece (2). The oscillating timepiece may advantageously be an oscillating winding mass. The invention also relates to a method for manufacturing such an oscillating mass.
    公开号:CH712108A1
    申请号:CH00177/16
    申请日:2016-02-11
    公开日:2017-08-15
    发明作者:Chevre Cédric
    申请人:Décovi S A；
    IPC主号:
    专利说明:

    Description TECHNICAL FIELD [0001] The present invention relates to the field of watchmaking. It relates more particularly to an oscillating mass. This kind of room has a room or heavy peripheral area that allows, according to the movements of the wearer of the watch, back a cylinder that includes a watch movement equipping the watch. The clock mechanisms also include, as other oscillating components, balances used in the systems regulating watch movements.
    STATE OF THE ART [0002] To produce an oscillating mass, a heavy peripheral part or sector, also defined as unbalance, is assembled on the periphery of a central part, called a board, so that the center of gravity of the oscillating mass does not coincide with its axis of rotation. Different metallic and / or synthetic materials can be used to make the board like the unbalance of oscillating masses. If one realizes the heavy sector in solid metal, which is more in precious metal, the cost of the mass becomes too high for entry-level watches.
    The fixing of the unbalance on the board of an oscillating mass is a precision operation which represents a significant part of the cost of said mass, especially when the board and the peripheral heavy sector are both metallic. Indeed, it is necessary to machine and shape very accurately the board and the heavy sector to ensure a resistant assembly of these elements, which requires labor, and therefore a significant cost. In addition, if these shapes are to be made in metal parts, machining can be particularly difficult to perform.
    In order to overcome these difficulties, US Patent 3,942,317 proposes to produce oscillating masses made of plastic loaded with heavy metal particles. Now, it results in fragile parts, on which the assembly of an axis of rotation is delicate.
    EP 2 482 142 A1 proposes to incorporate glass or carbon fibers to the loaded plastic, in order to improve the mechanical behavior of the material.
    In another document WO 2014/114 379 the oscillating masses comprise a peripheral piece integral with a central piece made from plastic loaded with heavy metal particles. In this case the peripheral parts must be made by molding on the central part. In another embodiment, the peripheral piece can be driven out or clipped onto the central piece. In both cases a molding operation is necessary and it is difficult to achieve high densities as can be obtained with peripheral parts made of heavy metals.
    [0007] Another document WO 2014/154705 describes another manufacture by composite molding of an oscillating mass. This mass comprises a molded central portion comprising a rib and a peripheral portion overmolded on this central portion, comprising another composite loaded with heavy metal particles.
    All embodiments of oscillating masses made of composites require molding and / or overmolding techniques and are subject to problems of deformation, breakage or degradation in difficult conditions such as high or low temperature, humidity. or shocks. In particular, the unbalance can be detached from the central portion which requires special shapes of the peripheries of the central part and unbalance, thus complicating the molds to achieve. The same difficulty is encountered when a loaded composite unbalance would be fixed on a central piece of light metal such as brass.
    The present invention aims to provide an advantageous solution for obtaining a quality oscillating weight entirely of metal and not comprising plastic parts, and whose cost is reduced.
    Disclosure of the Invention [0010] More specifically, the invention relates to an oscillating timepiece as proposed in the claims.
    In particular, the invention relates to an oscillating mass, particularly suitable for the automatic winding of a timepiece, comprising a first piece of mass m1 in a first metal, and a second piece of mass m2 in a second metal. assembled on the first piece, the mass m2 of the second piece being greater than that m1 of the first piece, characterized in that the second piece is crimped to the periphery of the first piece.
    The second metal of the oscillating mass is a heavy metal selected from tungsten, gold, tantalum, silver, molybdenum and nickel or an alloy comprising one of these metals. The first piece is made of brass, aluminum or any other ductile metal or an alloy of ductile metals. The first piece comprises a peripheral flange and the second piece has a nesting groove on said flange of the first piece. In an advantageous embodiment, the groove comprises a lip of decreasing thickness from the bottom of the groove. In an alternative embodiment the flange consists of a plurality of flanges. In one embodiment, the first part comprises an opening adapted to mount the oscillating mass on an axis of rotation. In one embodiment the lower or upper surface of the center piece is at least partially covered with a deposit. In one embodiment the lower or upper surface of the peripheral piece is at least partially covered with a deposit. In one embodiment, the deposit is made of a metallic or dielectric material.
    The invention also relates to a method of manufacturing an oscillating mass, especially for the automatic winding of a timepiece, characterized in that it comprises the following steps: - Making a first part in a first metal, said first piece having a projecting collar on the periphery of said piece; - Making a second piece of a second metal, said second piece having a groove in the lower side of the second piece; - Adjust the second piece on the first piece by inserting the collar in said groove; - Crimp the second piece on the first piece by plastic deformation of at least one flank of said groove on the flange.
    In a variant of the method the first and second parts are molded.
    In a variant of the method the first and second parts are machined.
    In a variant of the method, the groove comprises a lip of decreasing thickness from the bottom of the groove.
    In a variant of the method the collar is continuous or discontinuous.
    BRIEF DESCRIPTION OF THE DRAWINGS [0018] Other details of the invention will appear more clearly on reading the description which follows, made with reference to the appended drawings in which: FIG. 1 is a top view of an oscillating mass according to one embodiment of the invention, FIG. 2 shows a view at an angle of the upper part of the oscillating mass of FIG. 1; fig. 3 shows a view at an angle of the lower part of the oscillating mass of FIG. 1; fig. 4 shows a section of the ends of the central piece and the peripheral piece.
    Embodiment of the Invention [0019] The figures represent a preferred form of a bimetallic oscillating weight 1 according to the invention, intended to be used in timepieces such as self-winding watches.
    The oscillating mass 1 of the bimetallic type of the invention comprises a first part 2 and a second part 4 assembled to the first part 2 on a peripheral portion at least thereof. The first part 2 typically defines a disk or a portion of disk around an axis of the oscillating mass 1 and the second part 4 forms a peripheral-shaped unbalance assembled to the first part.
    The first piece 2 is made of a first metal or metal alloy, typically with a density of less than 8. Preferably, the brass will be used.
    The first piece 2 has a mass e and can be achieved by stamping or machining, in particular by laser cutting, water jet or conventional machining. One could also achieve the center piece based on other ductile metals such as aluminum, ductile metal alloys by shaping it by techniques known to those skilled in the art.
    The second part 4, integral with the first part 2, is made from a second metal or metal alloy different from the first metal forming the first part 2, especially denser than the first metal. This second piece 4 has a mass rri2, the mass m2 being greater than the mass mi of the first piece 2. Thus the second piece has an unbalance function of the oscillating mass 1.
    The second metal of the second piece 4 has a higher density than the first metal forming the first piece 2. The density of the second metal of the second piece 4 will preferably be greater than 8, more preferably greater than 9, or more preferably greater than 10. The second metal is selected from tungsten, gold, tantalum, silver, molybdenum and nickel or an alloy having one of these metals.
    The oscillating masses 1 comprise, in the first part 2, a central opening 2a for receiving an axis of rotation and whose center 2b defines the axis of the oscillating mass 1. The central opening 2a may comprise means fastening so that a pivot axis can be accommodated therein. These fixing means may for example comprise a ring which constitutes the hub of the oscillating mass. Fig. 3 illustrates a non-through opening 2c arranged to receive for example a ring forming part of the means for fixing the oscillating mass 1 to its pivot axis (not shown).
    In the embodiment shown, the first piece 2 has substantially the shape of a half-disc, comprising a first lower surface 24 and a first upper surface 26 opposite the first lower surface 26. The first piece is shaped on its periphery 22 circular to assemble said second piece 4.
    The oscillating mass 1 may comprise through openings 2b or non-through in the first part 2. A through opening is defined as an opening in the thickness of the first part 2, this thickness being defined as perpendicular to the plane of the first piece, the latter being also defined as board. Said openings 2b may have different shapes and depths. They make it possible to lighten the central part and contribute to the aesthetics of the oscillating mass 1.
    The second part 4 consists of an annular sector which preferably extends substantially over 180 °. The second piece 4comporte a lower surface 44 and an upper surface 46 opposite the lower surface 44.
    The second piece 4 also comprises an assembly end 4a, arranged to be crimped on the periphery 22 of said first piece 2. At the opposite end of the assembly end 4a, the annular sector forming the second piece has an outer end 4b. The outer end 4b defines the periphery of the oscillating mass 1.
    In an advantageous embodiment, said annular sector forming the second part covers an angle between 160 ° and 180 °.
    Alternatively, said annular sector may also cover an angle of less than 160 °.
    As described in detail below, the second part 4 is crimped to the periphery 22 of the first part 2. Said crimping can be achieved, as described below, thanks to an advantageous machining of the end of assembly 4a of the second piece and the periphery 22 of the first piece.
    More particularly, as illustrated in FIG. 1, the periphery 22 of the first part 2 of the oscillating mass 1 comprises a peripheral flange 20 and the assembly end 4a of the second part 4 comprises a groove 40 interlocking on said flange 20 of the first part 2.
    In an advantageous embodiment, the groove 40 has a U-shaped cross section, defined in a plane perpendicular to the lower surface 44 of the second piece 4 at least and passing through the center 2b, of height H1.
    The flange 20 is a projecting portion at the periphery 22 of the first part 2. The cross section of the flange 20, defined in a plane perpendicular to the plane of said first part 2 and comprising said center 2b, preferably a rectangle or square shape, defining a collar height H2 20.
    In an advantageous embodiment, the shape of the cross section of the groove 40 and that of the collar 20 are substantially identical and have the same dimensions apart from the groove height which is slightly greater than the height of the groove. The difference between the height of the groove and the height of said flange is preferably less than 20 μm, more preferably less than 10 μm.
    Said grooves 40 and flanges 20 may each be made by mechanical machining or by a molding technique.
    In an advantageous embodiment, the flange 20 is constituted by a plurality of flanges, for example a plurality of flange sectors separated from one another, such as crenellations, at the periphery of said first piece 2. thus obtaining a discontinuous collar but still allowing a crimping of the second part 4 by its groove 40 on the first part.
    In another embodiment of the flanges can be made in at least two parallel planes of said first piece 2.
    In the advantageous embodiment, illustrated in FIG. 1, the groove 40 comprises a lip 42 of decreasing thickness from the bottom 41 of the groove 40. This lip 42 advantageously allows an easier deformation of the bottom of the groove 40 to effect the crimping of the annular sector on the collar 20, that either by automated mechanical deformation (for example by repelling) or by manual deformation.
    In one embodiment the lower surface 24 or upper 26 of the central part 2 is covered at least partially with a deposit. In a variant, a deposit covers only at least partially the surfaces of said collar 20. In another embodiment, the lower surface 44 or the upper surface 46 of the peripheral part 4 is at least partially covered with a deposit. In a variant, a deposit covers only at least partially the surfaces of said groove 40.
    Said deposits of the first part 2 and the second part 4 may be made of a metallic material, dielectric or plastic.
    The invention also comprises a method of manufacturing an oscillating mass, in particular for the automatic reassembly of a timepiece, characterized in that it comprises the following steps: - Making a first part in a first metal, said first piece 2 having a collar 20 projecting on the periphery of said first piece 2;
    权利要求:
    Claims (15)
    [1]
    - Making a second part 4 of a second metal, said second part 4 having a groove 40 in the lower side of the second part 4, located on the axis of rotation side 3 of the oscillating part 1; - Adjust the second part on the first part 2 by inserting the flange 20 in said groove 40; - Crimp the second piece 4 on the first piece 2 by plastic deformation of at least one flank of said groove 40 on the flange 20. According to this method, the first and second pieces can be molded or machined by any usual method known to those skilled in the art. Preferably in step b), the groove 40 is formed so that it comprises a lip 42 of decreasing thickness from the bottom 44 of the groove 40. [0046] Finally, according to the method of FIG. the invention is used for step d) a crimping tool adapted to apply a homogeneous force on said lip. claims
    1. Oscillating mass (1), particularly adapted for the automatic winding of a timepiece, comprising a first piece (2) of mass mi in a first metal, and a second piece (4) of mass rri2 in a second metal assembled on the first piece, the mass m2 of the second piece being greater than that m- of the first piece, the second piece (4) having a density greater than that of the first piece (2), characterized in that the second piece is set on the periphery of the first piece (2).
    [2]
    2. oscillating mass (1) according to claim 1, characterized in that the second metal is a heavy metal is selected from tungsten, gold, tantalum, silver, molybdenum and nickel or an alloy comprising one of these metals.
    [3]
    3. Oscillating mass (1) according to one of claims 1 or 2, characterized in that the first part (2) is made of brass, aluminum or a ductile metal alloy.
    [4]
    4. oscillating mass (1) according to one of claims 1 to acacterized in that the first piece (2) comprises a peripheral flange (20) and the second piece (4) has a groove (40) nesting on said collar of the first piece (2).
    [5]
    5. oscillating mass (1) according to one of the preceding claims, characterized in that the groove (40) comprises a lip (42) of decreasing thickness from the bottom (41) of the groove (40).
    [6]
    6. oscillating mass according to claim 4 or 5, characterized in that the flange (20) consists of a discontinuous plurality of flanges.
    [7]
    7. oscillating mass according to the preceding claims, characterized in that the first part (2) comprises an opening (2a) adapted to mount the oscillating mass (1) on an axis of rotation.
    [8]
    8. oscillating mass according to the preceding claims, characterized in that a lower surface (24) or upper (26) of the central piece (2) is at least partially covered with a deposit.
    [9]
    9. oscillating mass according to the preceding claims, characterized in that a lower surface (44) or upper (46) of the peripheral part (4) is covered at least partially with a deposit.
    [10]
    10. oscillating mass according to claim 8 or 9, characterized in that the deposit is made of a metallic or dielectric material.
    [11]
    11. Method of manufacturing an oscillating mass, especially for the automatic reassembly of a timepiece, characterized in that it comprises the following steps: - Making a first piece (2) of a first metal, said first piece (2) having a flange (20) projecting on the periphery of said piece; - Making a second piece (4) of a second metal, said second piece (4) having a groove (40) in the lower side of the second piece (4); - Adjust the second piece (4) on the first piece (2) by inserting the flange (20) in said groove (40); - Crimp the second piece (4) on the first piece (2) by plastic deformation of at least one flank of said groove (40) on the flange (20).
    [12]
    12. The method of claim 11, characterized in that the first and the second part are molded.
    [13]
    13. Method according to claims 11 or 12, characterized in that the first (2) and the second (4) part are machined.
    [14]
    14. Method according to one of claims 11 to 13, characterized in that the groove (40) comprises a lip (42) of decreasing thickness from the bottom (41) of the groove (40).
    [15]
    15. Method according to one of claims 11 to 14, characterized in that the flange (20) is continuous or discontinuous.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CH287614A|1950-12-21|1952-12-15|Schild Sa A|Weight for automatic winding watch.|
    CH303338A|1952-10-17|1954-11-30|Record Watch Co S A|Winding mass for a self-winding timepiece.|
    FR2312809A1|1975-05-30|1976-12-24|Ebauchesfabrik Eta Ag|METHOD OF MANUFACTURING A WINDING MASS FOR A AUTOMATIC WINDING WATCH MOVEMENT AND WINDING MASS MANUFACTURED ACCORDING TO THIS PROCEDURE|
    CN2638109Y|2003-08-06|2004-09-01|郑金良|Automatic hammer|
    CN202472252U|2012-01-13|2012-10-03|杭州正驰达精密机械有限公司|High-density alloy automatic ram|
    CH706285A2|2012-03-21|2013-09-30|Seiko Instr Inc|decorative component, timepiece component, timepiece and method for decorative component manufacturing.|EP3879354A1|2020-03-09|2021-09-15|The Swatch Group Research and Development Ltd|Oscillating winding mass provided with a decorative element for automatic movement of a timepiece|
    法律状态:
    2019-06-14| NV| New agent|Representative=s name: BOVARD SA NEUCHATEL CONSEILS EN PROPRIETE INTE, CH |
    优先权:
    申请号 | 申请日 | 专利标题
    CH00177/16A|CH712108B1|2016-02-11|2016-02-11|Oscillating weight, especially for timepieces.|CH00177/16A| CH712108B1|2016-02-11|2016-02-11|Oscillating weight, especially for timepieces.|
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