• 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 a pendulum (1), for watch movement, comprising a hub (2) intended to be secured to a balance shaft and carrying a peripheral mass, distributed in a balanced manner around the hub (2), by intermediate of at least two arms (6). Each arm (6) has, in cross section, a base (16) of width L1 surmounted by a reinforcing portion (18) substantially centered on the base (16) and of width L2 less than the width L1 of the base (16).
    公开号:CH710674A2
    申请号:CH00060/15
    申请日:2015-01-18
    公开日:2016-07-29
    发明作者:Candaux David；Schluechter Hervé；Raffy Pascal
    申请人:Dimier 1738 Mft De Haute Horlogerie Artisanale；
    IPC主号:
    专利说明:

    Technical area
    The present invention relates to a pendulum for watch movement, comprising a hub intended to be secured to a balance shaft and carrying a peripheral mass, distributed in a balanced manner around the hub, through at least two arms.
    The present invention also relates to a watch movement incorporating such a balance and a timepiece comprising such a watch movement.
    State of the art
    Balancers of this type are commonly used nowadays for the realization of time bases in mechanical watches.
    The geometry of the balance, particularly from the point of view of its inertia and its aerodynamics, is one of the parameters that greatly impact the value of its quality factor and therefore the accuracy of the corresponding watch.
    Also, many researches have already been done to propose solutions consisting of optimizing the geometry of the balance to improve its quality factor.
    By way of example, patent CH 698 125 B1 describes a three-armed balance wheel each carrying a pair of flyweights at its free end. The arms are made of a metal or metal alloy of low density, such as aluminum or titanium, while the weights are made of a metal or metal alloy of high density, such as gold or platinum. The shape of the weights has also been optimized to improve the aerodynamic properties of the balance.
    Another example of a similar beam is presented in patent application EP 1973 013 A1. The pendulum described in this document has a lightened construction, particularly at its arms which are partially recessed and whose width decreases along the arms from the center to the outside of the balance.
    With other geometrical parameters, the arm structure plays an important role in obtaining a good quality factor of the corresponding pendulum. Indeed, the arms should be as light as possible while having a sufficient level of rigidity, otherwise balancing of the balance could be disturbed during use.
    Disclosure of the invention
    A main object of the present invention is to provide an alternative structure of pendulum with reference to known pendulums, including a high quality factor.
    For this purpose, the present invention relates more particularly to a rocker of the type mentioned above, characterized in that each of its arms has, in cross section, a base of width L1 surmounted by a substantially centered reinforcing portion on the base and width L2 less than the width L1 of the base.
    With these features, the arms can be refined with reference to the known mechanisms, without the need to make any compromise on their rigidity.
    Indeed, such an arm structure in T-shaped section to optimize their dimensions and therefore their mass, while ensuring the necessary degree of rigidity.
    Advantageously, it can be provided that the reinforcing portion extends from a first inner end of the arm, integral with the hub, substantially to the outer end of the arm, connected to the peripheral mass.
    In addition, it may be even more advantageous to provide in this case that the reinforcing portion has a thickness similar to or greater than the thickness of the base.
    In general, it can be provided that the hub and the arms are formed in one piece.
    Furthermore, the mass may consist of at least two flyweights regularly distributed around the hub, each weight being carried by at least one of the arms.
    Advantageously, each of the weights has an aerodynamic shape and is preferably formed of a part with the arm that carries it.
    According to a preferred embodiment, it can be provided that each of the arms further carries an additional adjustment weight arranged on the corresponding arm so as to be movable, preferably in rotation, and allow adjustment of the balance of the balance. .
    In general, one can also provide that the balance has reinforcement branches in the form of a circular arc, connecting the two arms in pairs.
    According to a preferred embodiment, the present invention also relates to a watch movement incorporating such a balance and a timepiece comprising such a watch movement.
    Brief description of the drawings
    Other features and advantages of the present invention will appear more clearly on reading the detailed description of a preferred embodiment which follows, with reference to the accompanying drawings given by way of non-limiting examples and in which :<tb> fig. 1 <SEP> represents a simplified top view of a beam according to a preferred embodiment of the present invention;<tb> fig. 2 <SEP> represents a simplified side view of the beam of FIG. 1;<tb> fig. 3 <SEP> represents a simplified perspective view of the beam of FIG. 1 when placed in a tourbillon cage, and<tb> fig. 4 <SEP> represents a simplified perspective view of a beam according to an alternative embodiment of the present invention.
    Mode (s) of realization of the invention
    FIG. 1 shows a simplified top view of a balance 1 according to a preferred main embodiment of the present invention. Fig. 2 shows a side view of the balance 1 and FIG. 3 represents it in a simplified perspective view when it is set up in a tourbillon cage, as a non-limiting illustrative example. These three figures will make it possible to present the general structure of the balance 1 according to the preferred embodiment of the present invention.
    It appears from Figs. 1 and 2 that the rocker 1 comprises a hub 2 provided with a central hole 4 to allow the assembly of the rocker arm to a balance shaft (not shown in these figures).
    Three arms 6 extend here from the hub 2, illustrative non-limiting manner. The arms 6 are evenly distributed around the hub 2, in other words two neighboring arms define between them an angle of 120 degrees.
    Each arm 6 has a generally elongate shape and carries a flyweight 8 at its free end. Each weight 8 has a general shape in double bill to ensure good aerodynamics when the balance 1 rotates with reference to its axis of rotation.
    In addition, we see that a housing 10 is formed in the middle of each feeder 8 and comprises a support finger 12 on which is engaged an additional adjusting weight 14. Each of these additional adjusting weight 14 is rotatable on the finger 12 and is intended to allow a fine adjustment of the balancing balance 1. Indeed, the mass distribution of these control weights 14 is not symmetrical with respect to their axis of rotation. Thus, a rotation of the weight causes a displacement of its center of inertia, in known manner.
    As discussed above, it is important to ensure that the mass of the arm 6 is as low as possible with reference to the total mass of the balance 1 to ensure that the latter has a high quality factor. This amounts to saying that the mass of the arms 6 must preferably remain low in reference to the mass generally borne by the assembly comprising the hub 2 and the arms 6, ie the set of weights 8 and control weights 14.
    Also, the arms 6 are relatively thin. Such fineness of the arms 6 is made possible by the implementation of a particular geometry, visible in FIGS. 1, 2 and 3.
    Indeed, it appears from the figures that each arm 6 comprises a base 16, extending from the hub 2 to the corresponding flyweight 8, surmounted by a reinforcing portion 18 also extending from of the hub 2 and ending near the housing 10, so as not to obstruct the passage to set up the adjusting weights 14. Each reinforcing portion 18 has a width L2 less than the width L1 of the corresponding base 16 being substantially centered on the latter. Moreover, it appears more particularly from FIG. 2 that each reinforcing portion 18 has a thickness slightly greater than that of the corresponding base 16, by way of nonlimiting illustration.
    The skilled person will not encounter any particular difficulty to implement relative dimensions between the base 16 and its reinforcing portion 18 adapted to its own needs. Thus, it is possible to provide for example that the thickness of the reinforcing portion is similar to that of the base without departing from the scope of the present invention.
    Advantageously, the hub 2 and the arms 6 are formed of a part, in particular aluminum for example. It is also possible that the weights 8 and the support fingers 12 are formed integrally with the hub 2 and the arms 6, without limitation.
    FIG. 3 illustrates the implementation of the balance 1 according to the present invention in a timepiece of high-end, the balance 1 being integrated in a time base of the tourbillon type.
    [0033] It can be seen in FIG. 3 that the level of completion of the balance 1 can be adapted to the range level of the timepiece for which it is intended. In this case, it is noted that the balance 1 can undergo a finishing treatment high-end, including a manual chamfering to soften the edges of the weights 8 as well as those of the arms 6. Moreover, it also appears that the 14 adjustment weights have a rounded shape to help improve the aerodynamics of the balance 1.
    FIG. 4 shows a simplified perspective view of a rocker 20 according to an alternative embodiment of the present invention.
    The rocker 20 is illustrated in FIG. 4 while assembled to a balance shaft 21.
    The rocker 20 comprises a hub 22 from which extend three arms 26 bearing weights 28 at their free end. An additional reinforcing structure is provided here to further improve the rigidity of the arms 26. Indeed, it appears from FIG. 4 that three reinforcing branches 30, in the form of a circular arc, connect the arms 26 in pairs. These reinforcing branches 30 are connected to the arms 26 at about one third of their length counted from the hub 22.
    Of course, the skilled person will not encounter any particular difficulty to adapt the layout, shape and dimensions of the reinforcing branches according to his own needs, without departing from the scope of the present invention.
    Note that in the variant illustrated in FIG. 4, the weights 28 are elements attached to the free ends of the arms 26, being assembled to the latter by means of screws 32, by way of nonlimiting illustration. The shape of the weights 28 is similar to the shape of the weights 8 described in connection with the previous embodiment, these having a housing 34 and a support finger (not visible) to receive an additional adjustment weight 36.
    In general, the weights and additional weights may be made of a metal or metal alloy of higher density than the arms and the hub.
    It is clear from the present disclosure that the balance according to the invention can be achieved with a high quality factor while advantageously having a relatively simple structure.
    The foregoing description attempts to describe a particular embodiment by way of non-limiting illustration and, the invention is not limited to the implementation of certain particular features which have just been described, in particular the forms illustrated and described for the various weights.
    Indeed, the skilled person will not encounter any particular difficulty to adapt the content of the present disclosure to his own needs and implement a pendulum according to the invention without necessarily implement all the characteristics of the mode of realization which has just been described.
    For example, the shape of the balance arms according to the invention can also be implemented with a conventional balance rod without departing from the scope of the invention.
    权利要求:
    Claims (11)
    [1]
    1. Pendulum (1, 20) for a watch movement, comprising a hub (2, 22) intended to be secured to a balance shaft and carrying a peripheral mass, distributed in a balanced manner around said hub (2, 22) by means of at least two arms (6, 26),characterized in that each of the arms (6, 26) has, in cross section, a base (16) of width L1 surmounted by a reinforcing portion (18) substantially centered on said base (16) and of width L2 less than the width L1 of the base (16).
    [2]
    2. Pendulum (1, 20) according to claim 1, characterized in that said reinforcing portion (18) extends from a first inner end of said arm (6, 26), integral with the hub (2, 22), substantially to the outer end of said arm (6, 26), connected to said peripheral mass.
    [3]
    3. pendulum (1, 20) according to claim 1 or 2, characterized in that said reinforcing portion (18) has a thickness similar to or greater than the thickness of said base (16).
    [4]
    4. balance (1, 20) according to one of the preceding claims, characterized in that said hub (2, 22) and said arms (6, 26) are formed in one piece.
    [5]
    5. Pendulum (1, 20) according to one of the preceding claims, characterized in that said mass consists of at least two weights (8, 28) evenly distributed around said hub (2, 22), each weight (8 28) being carried by at least one of said arms (6, 26).
    [6]
    6. Pendulum (1, 20) according to claim 5, characterized in that each of said weights (8, 28) has an aerodynamic shape.
    [7]
    7. Pendulum (1) according to claim 5 or 6, characterized in that said weights (8) are formed integrally with said arms (6).
    [8]
    8. Pendulum (1, 20) according to one of the preceding claims, characterized in that each of said arms (6, 26) further carries an additional adjusting weight (14, 36) arranged on said arm (6, 26) corresponding so as to be movable, preferably in rotation, and allow adjustment of the balance of the balance (1, 20).
    [9]
    9. Pendulum (20) according to one of the preceding claims, characterized in that it comprises reinforcing branches (30) in the form of a circular arc, connecting said arms (26) in pairs.
    [10]
    10. Watch movement comprising a balance (1, 20) according to one of claims 1 to 8.
    [11]
    Timepiece comprising a watch movement according to claim 9.
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    同族专利:
    公开号 | 公开日
    CH710674B1|2018-12-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2017-07-14| PK| Correction|Free format text: RECTIFICATION TITULAIRE |
    优先权:
    申请号 | 申请日 | 专利标题
    CH00060/15A|CH710674B1|2015-01-18|2015-01-18|Pendulum for watch movement.|CH00060/15A| CH710674B1|2015-01-18|2015-01-18|Pendulum for watch movement.|
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