EP3955064A1 - Timepiece component comprising an opening designed for insertion of an axis - Google Patents
Timepiece component comprising an opening designed for insertion of an axis Download PDFInfo
- Publication number
- EP3955064A1 EP3955064A1 EP20190761.5A EP20190761A EP3955064A1 EP 3955064 A1 EP3955064 A1 EP 3955064A1 EP 20190761 A EP20190761 A EP 20190761A EP 3955064 A1 EP3955064 A1 EP 3955064A1
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- EP
- European Patent Office
- Prior art keywords
- notches
- elastic part
- timepiece component
- component according
- elastic
- 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.)
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- 238000003780 insertion Methods 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 13
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- 238000000926 separation method Methods 0.000 description 8
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- 239000011521 glass Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000005459 micromachining Methods 0.000 description 2
- 241000030366 Scorpidinae Species 0.000 description 1
- 241000826860 Trapezium Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
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- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
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
- G04B13/00—Gearwork
- G04B13/02—Wheels; Pinions; Spindles; Pivots
- G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
- G04B13/022—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft with parts made of hard material, e.g. silicon, diamond, sapphire, quartz and the like
Definitions
- the present invention relates to a timepiece component comprising an element in the form of a perforated plate which is produced in a single piece of a fragile material and which comprises an opening intended for driving in an axis.
- An object of the present invention is to remedy the drawbacks of the prior art which have just been explained.
- the present invention achieves this and other objects by providing a horological component which is in accordance with appended claim 1.
- the element comprising the opening intended for driving out a shaft comprises at least a first part and at least a second part, the first part, called the connecting part, being arranged so as to connect the element in the form of a perforated plate to the rest of the timepiece component, and the second part, called the elastic part, having a plurality of internal notches cutting into its internal side, and a plurality of external notches cut into its external side.
- the internal notches and the external notches are oriented radially with respect to the opening intended for driving in the shaft, and are arranged alternately so that a section of the elastic part which is delimited on both sides another by two outer notches always contains an inner notch, and vice versa.
- the presence of the inner notches and the outer notches has the effect of reducing in places the distance between the inner and outer edges of the elastic part.
- the latter thus comprises a succession of constricted places which are easier to deform elastically.
- their deformations affect the degree of opening of the notch in question.
- the two edges of each notch will deviate or approach depending on the deformations of the narrow places.
- the simultaneous separation of the edges of the internal notches results in an elongation of the internal side of the elastic part
- the simultaneous separation of the edges of the external notches results in an elongation of its external side.
- a simultaneous separation of the edges of the inner notches and the edges of the outer notches results in a general elongation of the elastic part.
- the connecting part has an inner side whose shape is complementary to that of the axis and an outer side whose central portion is not significantly deformed during driving-in.
- the driving out of a pin is associated with an elongation of the elastic part. It will be understood that this results in a non-negligible distortion of the external shape of the element in the form of a perforated plate. Under these conditions, it is advantageous for the connecting part to be only slightly deformed. Indeed, this characteristic makes it possible to absorb the geometric variations due to the tolerances without causing significant variations in the position of the center of pivoting relative to the rest of the component.
- the figure 1 is a plan view of a timepiece component that conforms to a first exemplary embodiment.
- the component shown in figure 1 is intended to exert a restoring torque on a pivoted axis.
- the component comprises an elastic arm 9, a base 24 and an element 25 in the form of a perforated plate.
- One of the ends of the elastic arm 9 is connected to the frame of a timepiece via the base 24, and the other end is connected to a cylindrical axis 10 via the element 25 in the form of perforated plate.
- the axis 10 is a pivoted axis which is driven into an opening 11 of the element 25.
- the respective diameters of the axis 10 and of the opening 11 are chosen so that the element 25 exerts on the axis 10 a clamping force of sufficient intensity to make these two elements integral.
- the element 25, the elastic arm 9 and the base 24 are made of a fragile material; for example silicon, quartz or glass.
- these three elements come from the material, or in other words, these three elements together form a one-piece component made by micro-machining from a single block of fragile material.
- the function of the watch component of the figure 1 is to exert on the axis 10 a return torque (which is oriented clockwise in the figure). This component is likely to be integrated for example in a cam mechanism like the one described in the patent document EP 3 598 242 A1 . This document is incorporated by reference in the present description.
- the element 25 has been divided into a first and a second part (referenced 13 and 15 respectively) by means of two dashed lines.
- the part 13 to which the elastic arm 9 is attached is the first part, or connecting part.
- the latter has an axis of symmetry oriented radially so as to pass through the center of the opening 11 and through the point of attachment of the end of the elastic arm 9, and it has an inner side in the form of an arc of circle whose radius of curvature corresponds substantially to that of the axis 10, and an outer side which comprises a straight central segment extending between two shoulders.
- the second part, or elastic part 15 generally has the shape of a crown sector with an inner side in an arc of a circle whose radius of curvature corresponds substantially to that of the axis 10, and an outer side which is concentric on the inner side.
- Six inner notches 17 are cut in the inner side and five outer notches 19 are cut in the outer side.
- the inner 17 and outer 19 notches are regularly spaced and arranged alternately so that inside the elastic part 15, a section delimited by two inner notches 17 always contains an outer notch 19, and vice versa.
- the internal notches 17 have the shape of notches oriented radially with respect to the axis 10, and they each end in a circular widening. Their length is between three-quarters and four-fifths of the distance separating the inner side from the outer side.
- the figure 1 further observes that, due to the presence of the internal notches, the developed length of the internal edge of the extensible sector is equal to at least four times the length of the internal arcuate side of the elastic part.
- the outer notches 19, for their part, have substantially the shape of half-moons, the radius of which is equal to approximately one third of the distance separating the outer side from the inner side. It can be seen that the proximity between the inner notches 17 and the outer notches 19 has the effect of reducing in places the distance separating the inner edge of the elastic part 15 from its outer edge.
- the elastic part thus comprises a succession of narrow isthmuses which each separate the circular end of an inner notch 17 from the arcuate edge of an outer notch 19. It will be understood that because of their narrowness, these are these isthmuses which support the major part of the deformation when the elastic part 15 is subjected to stresses.
- the picture 2 is a plan view of a timepiece component that conforms to a second exemplary embodiment.
- the component shown in figure 2 comprises an elastic arm 109, a base 124 and an element 125 in the form of a perforated plate.
- This component is intended to exert a restoring torque on a pivoted pin 110 which is driven into an opening 111 of the element 125.
- the element 125, the elastic arm 109 and the base 124 are made in one brittle material; for example silicon, quartz or glass.
- these three elements come from the material.
- the restoring torque exerted by the timepiece component is oriented clockwise.
- This component is intended to be integrated for example in a cam mechanism like the one described in the patent document EP 3 598 242 A1 .
- the outline of the element 125 is part of a crown delimited by an inner circle 127 and by an outer circle 129 concentric. It can be seen that the circle 127 delimits the opening 111, its radius therefore being substantially equal to that of the axis 110.
- the crown between the inner circle 127 and the outer circle 129 has been divided into a first and a second part (referenced 113 and 115 respectively).
- the part 113 to which the elastic arm 109 is attached is the first part, or connecting part.
- the latter has an inner side in an arc of a circle which is superimposed on the inner circle 127, and an outer side which is straight.
- the first part thus presents the general shape of an isosceles trapezium whose small base would not be rectilinear, but rounded concave. It can be seen that the elastic arm 109 is attached to the middle of the rectilinear outer side of the part 113.
- the second part 115 or elastic part, has an inner side and an outer side formed by two arcs of concentric circles which are respectively superimposed on the inner circle 127 and outer circle 129. Eleven inner notches 117 are cut into the inner side and ten outer notches 119 are cut into the outer side.
- the interior 117 and exterior 119 notches are regularly spaced and arranged in alternation so that, inside the elastic part 115, a section delimited by two internal notches 117 always contains an external notch 119, and vice versa.
- the internal notches 117 and the external notches 119 have the form of notches oriented radially with respect to the axis 110.
- the internal notches and the external notches have the same length. The latter is between 70 and 80% of the distance separating the outer side of the elastic part from its inner side.
- the developed length of the interior edge of the elastic part is equal to at least four times, preferably at least ten times, the length of the interior side of the elastic part.
- the interpenetration of the inner notches 117 and the outer notches 119 has the effect of giving the elastic part 115 the shape of a serpentine ribbon which runs in zigzag over a range in the form of a crown sector between the inner circle 127 and the outer circle 129.
- the elastic part 115 thus comprises a series of straight sections which each separate an inner notch 117 from an outer notch 119, a first series of "U"-shaped sections each separating the end of a notch exterior 119 on the interior side of the elastic part, and finally a second series of "U” sections each separating the end of an interior notch 117 on the exterior side.
- each straight section is attached by a first end to a "U" shaped section of the first series, and by its second end to a "U” shaped section of the second series. So that the sections all together form a single chain. It will also be understood that because of their narrowness, each of these sections is liable to deform elastically in bending when the elastic part 115 is subjected to stresses. Conversely, when the various sections are deformed, the elastic part itself undergoes a deformation which is the result of the deformations of the individual sections. As already mentioned, the sections form the edges of the inner and outer notches. In these conditions, the degree of opening of the notches, or in other words the spacing between the edges thereof, changes when the sections bend.
- the picture 3 is a plan view of a timepiece component that conforms to a third exemplary embodiment.
- the component shown in picture 3 comprises an elastic arm, a base and an element in the form of a perforated plate (referenced respectively 209, 224 and 225).
- element 225 shares many features with element 125 shown in the figure 2 . This is the reason why only the characteristics which distinguish the third embodiment from the second will be described in detail.
- the main difference between the two embodiments is that the element of the picture 3 consists of four parts instead of two. In this respect, it can be seen in the drawing that the crown in which the outline of the element 225 is inscribed is divided into four sectors by radial lines in broken lines.
- the parts of the element 225 which are contained in the four crown sectors are a first and a second connecting part (referenced respectively 213a and 213b) and two elastic parts 215a, 215b.
- first connecting part 213a is substantially identical to the connecting part 113 of the previous embodiment.
- the connecting part 213b for its part, has an inner side and an outer side constituted by two concentric circular arcs.
- the second connecting part is not directly connected with the outside of the element 225, but only serves as a connection between the two elastic parts 215a and 215b. Apart from their length, these are very similar to the elastic portion 115 of the previous embodiment.
- Each of the two parts elastic has four inner notches 217 which are cut into its inner side and four outer notches 219 which are cut into the outer side.
- a section delimited by two internal notches 217 always contains an external notch 219, and vice versa. Due to the presence of the interior notches 217, the developed length of the interior edge of either of the elastic parts is equal to at least four times, preferably at least five times, the length of the interior side of the elastic part concerned.
- the figure 4 , 5 and 6 are different views of a timepiece component which conforms to a fourth particular embodiment of the invention.
- the component illustrated in these four figures comprises a wheel (referenced 308) and an element in the form of a perforated plate (referenced 325).
- the wheel 308 is designed to be secured to an axle 310 via the element 325 in the form of a perforated plate.
- the shaft 310 and the timepiece component together constitute a mobile capable of forming part of a timepiece train.
- the element 325 in the form of a perforated plate has an opening 311 into which the pin 310 can be driven.
- the figures 5 and 6 show the watch component attached to the axis 310, while the partial view of the figure 4 shown prior to driving the shaft through the opening 311.
- the timepiece component according to the third embodiment differs from the timepiece component according to the fourth in one piece with the other parts of the component.
- the figures indeed show that the element 325 in the form of a perforated plate is fixed to the wheel 308 by means of two flat-headed cylindrical studs (referenced 331 and 333). Taken alone, element 325 shares many characteristics with element 225 illustrated in the picture 3 . We can see first of all that it has the general shape of a crown, and that the latter is subdivided into four crown sectors by radial lines which are drawn in broken lines in the figure 4 .
- a first pair of crown sectors is occupied by two parts elastics 315a, 315b which are identical.
- the other pair of crown sectors is occupied by two connecting parts 313a, 313b which are also identical.
- the two elastic parts 315a and 315b are very similar to the elastic parts 215a, 215b of the previous embodiment. Each of them has four inner notches 317 cut into its inner side and five outer notches 319 cut into its outer side. Inside each elastic part 315a, 315b, a section delimited by two outer notches 319 always contains an inner notch 317, and vice versa.
- the two connecting parts 313a, 313b for their part, each have an inner side in an arc of a circle and an outer side formed by two rectilinear segments which extend on either side of a wide central notch (referenced respectively 335a and 335b).
- the central notch of each of the connecting parts 313a, 313b is oriented radially.
- the figure 4 also shows that the two cylindrical rods 337 of the tenons 331, 333 are engaged laterally in the two notches 335a, 335b.
- the studs 331, 333 are arranged to secure the element 325 and the wheel (not shown in the figure 4 ), and it will be understood that their presence blocks in particular any rotation of the element 325 in the form of a perforated plate in the plane of the wheel 308.
- the notches 335a, 335b are shaped so as to allow the side walls of the notches to slide with fatty friction against the cylindrical rods 337 of the tenons 331, 333. This characteristic gives the possibility to the connecting parts 313a, 313b of the element 325 in the form of a perforated plate to move radially.
- the dimensions of the four crown sectors are chosen so that the edges of the opening 311 exert on the axis 310 an elastic clamping force of sufficient intensity to generate a static binding torque having the effect of securing the element 325 to the axis 310, as long as the mobile transmission torque remains lower than the static connection torque.
- the value of the static connection torque corresponds to the maximum value that the transmission torque can assume before slipping.
- the element 25 is no longer secured, but on the contrary it is free to rotate by friction around the axis 310.
- the possibility of implementing the watchmaking component of the The invention both above and below the slip limit makes it possible to produce slipper clutches, for example.
- the figure 4 shows the element 325 as it appears prior to the driving of a pin through the opening 311. It can be understood that when the pin 310 is then inserted into the opening, it separates the two connecting parts 313a , 313b by pushing them radially. The maximum spacing is reached when the cylindrical rods 337 of the two studs 331, 333 come into abutment against the bottom of the two notches 335a, 335b. It is the presence of the two elastic parts 315a, 315b which allows the connecting parts 313a, 313b to move apart.
- the plan view of the figure 5 and the longitudinal sectional view of the figure 6 show the watch component attached to the axis 310.
- the wheel 308 is a toothed wheel pierced with a central hole 321 allowing the passage of the axis 310.
- the upper face of the plate of the wheel 308 has a large circular hollow 323 with a flat bottom which is concentric with the central hole.
- the element 325 in the form of a perforated plate is fixed on the bottom of the recess 323. It can be seen that the two tenons 331, 333 which serve to secure the element 325 with the wheel 308 are driven into two fixing holes which are drilled through the bottom of the recess on either side of the central hole 321.
- connection between the wheel 308 and the connection parts 313a, 313b has only one degree of freedom , and that the connecting parts can only move radially in the direction of one or the other of the two fixing holes.
- the axis 310 is formed of a cylindrical rod 341 terminating in a pivot 343 at each end.
- the cylindrical rod 341 also comprises, close to one of its ends, a collar 345 against which the element 325 in the form of a perforated plate can abut when the axis 310 is driven into the opening 311 by its other end. It will be understood that the function of the collar 345 is to determine the axial positioning of the wheel 308 with respect to the axis 310.
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Abstract
Le composant horloger comprend un élément (225) en forme de plaquette ajourée qui est réalisé en une seule pièce d'un matériau fragile et qui comporte une ouverture (211) destinée au chassage d'un axe (210). L'élément en forme de plaquette ajourée est constitué d'au moins une partie de liaison (213a, 213b) et d'au moins une partie élastique (215a, 215b), partie de liaison étant agencée de manière à relier l'élément (225) en forme de plaquette ajourée au reste du composant, et la partie élastique (215a, 215b), présentant une pluralité d'encoches intérieures (217) et une pluralité d'encoches extérieures (219), les encoches intérieures et les encoches extérieures étant agencées en alternance, de sorte qu'un tronçon de la partie élastique (215a, 215b) qui est délimité de part et d'autre par deux encoches extérieures (219) contient toujours une encoche intérieure (217), et vice versa.The timepiece component comprises an element (225) in the form of a perforated plate which is produced in a single piece of a fragile material and which comprises an opening (211) intended for driving in a pin (210). The element in the form of a perforated plate consists of at least one connecting part (213a, 213b) and at least one elastic part (215a, 215b), connecting part being arranged so as to connect the element ( 225) in the form of a perforated plate to the rest of the component, and the elastic part (215a, 215b), having a plurality of internal notches (217) and a plurality of external notches (219), the internal notches and the external notches being arranged alternately, so that a section of the elastic part (215a, 215b) which is delimited on either side by two outer notches (219) always contains an inner notch (217), and vice versa.
Description
La présente invention concerne un composant horloger comprenant un élément en forme de plaquette ajourée qui est réalisé en une seule pièce d'un matériau fragile et qui comporte une ouverture destinée au chassage d'un axe.The present invention relates to a timepiece component comprising an element in the form of a perforated plate which is produced in a single piece of a fragile material and which comprises an opening intended for driving in an axis.
Dans le domaine de la micromécanique horlogère, on a très largement recours au chassage pour assujettir un composant, par exemple une roue, sur un arbre ou un piton. Lorsque le matériau constituant le composant possède un domaine plastique, ce qui est le cas des métaux et des alliages métalliques, on sait calculer les tolérances nécessaires pour l'arbre et l'alésage, de façon à avoir un ajustement serré sans risquer de briser le composant, ou de le déformer. Lorsque le matériau ne possède pas, ou très peu, de domaine plastique, ce qui est le cas notamment du verre, du quartz et du silicium, le risque est grand de briser le composant au montage. Or ces matériaux sont largement utilisés en horlogerie en raison notamment de leur insensibilité aux champs magnétiques, de leur très faible coefficient d'expansion thermique, et de leur densité bien inférieure à celle des métaux et alliages. De plus, les technologies de micro-usinage modernes permettent de réaliser des formes complexes avec une grande précision.In the field of watchmaking micromechanics, driving-in is widely used to secure a component, for example a wheel, to a shaft or a stud. When the material constituting the component has a plastic domain, which is the case of metals and metal alloys, it is known how to calculate the necessary tolerances for the shaft and the bore, so as to have a tight fit without risking breaking the component, or deform it. When the material has no, or very little, plastic domain, which is the case in particular of glass, quartz and silicon, there is a great risk of breaking the component during assembly. However, these materials are widely used in watchmaking due in particular to their insensitivity to magnetic fields, their very low coefficient of thermal expansion, and their density much lower than that of metals and alloys. In addition, modern micromachining technologies make it possible to produce complex shapes with high precision.
Dans ce contexte, on a déjà proposé de munir de bras de serrage le composant que l'on désire assujettir sur un arbre, ce dernier étant ainsi maintenu élastiquement entre les bras de serrage. La demanderesse a toutefois observé que, dans un encombrement donné, de tels assemblages ne permettent pas toujours d'avoir des tolérances dimensionnelles qui soient suffisantes pour absorber les variations géométriques, tout en assurant simultanément que le couple de transmission ait une limite maximum avant glissement qui soit suffisante elle aussi.In this context, it has already been proposed to provide the component which it is desired to secure to a shaft with clamping arms, the latter thus being held elastically between the clamping arms. The applicant has however observed that, in a given size, such assemblies do not always allow dimensional tolerances to be obtained which are sufficient to absorb geometric variations, while simultaneously ensuring that the transmission torque has a maximum limit before slipping which is also sufficient.
Un but de la présente invention est de remédier aux inconvénients de l'art antérieur qui viennent d'être expliqués. La présente invention atteint ce but ainsi que d'autres en fournissant un composant horloger qui est conforme à la revendication 1 annexée.An object of the present invention is to remedy the drawbacks of the prior art which have just been explained. The present invention achieves this and other objects by providing a horological component which is in accordance with appended claim 1.
Conformément à l'invention, l'élément comportant l'ouverture destinée au chassage d'un axe comprend au moins une première partie et au moins une deuxième partie, la première partie, dite partie de liaison, étant agencée de manière à relier l'élément en forme de plaquette ajourée au reste du composant horloger, et la deuxième partie, dite partie élastique, présentant une pluralité d'encoches intérieures entaillant son côté intérieur, et une pluralité d'encoches extérieures découpées dans son côté extérieur. De plus, les encoches intérieures et les encoches extérieures sont orientées radialement par rapport à l'ouverture destinée au chassage de l'axe, et sont agencées en alternance de sorte qu'un tronçon de la partie élastique qui est délimité de part et d'autre par deux encoches extérieures contient toujours une encoche intérieure, et inversement.According to the invention, the element comprising the opening intended for driving out a shaft comprises at least a first part and at least a second part, the first part, called the connecting part, being arranged so as to connect the element in the form of a perforated plate to the rest of the timepiece component, and the second part, called the elastic part, having a plurality of internal notches cutting into its internal side, and a plurality of external notches cut into its external side. In addition, the internal notches and the external notches are oriented radially with respect to the opening intended for driving in the shaft, and are arranged alternately so that a section of the elastic part which is delimited on both sides another by two outer notches always contains an inner notch, and vice versa.
La présence des encoches intérieures et des encoches extérieures a pour effet de réduire par endroit la distance entre les bords intérieur et extérieur de la partie élastique. Cette dernière comprend ainsi une succession d'endroits resserrés qui sont plus faciles à déformer élastiquement. Plus l'épaisseur de matière est réduite, plus un endroit est facile à déformer. De plus, comme les endroits étroits jouxtent toujours au moins une encoche, leurs déformations se répercutent sur le degré d'ouverture de l'encoche en question. En résumé, les deux bords de chaque encoche vont s'écarter ou se rapprocher en fonction des déformations des endroits étroits. On comprendra que l'écartement simultanés des bords des encoches intérieures résulte en un allongement du côté intérieur de la partie élastique, alors que l'écartement simultané des bords des encoches extérieures résulte en un allongement de son côté extérieur. Enfin, un écartement simultané des bords des encoches intérieures et des bords des encoches extérieures résulte en un allongement général de la partie élastique.The presence of the inner notches and the outer notches has the effect of reducing in places the distance between the inner and outer edges of the elastic part. The latter thus comprises a succession of constricted places which are easier to deform elastically. The smaller the material thickness, the easier a place is to deform. Moreover, as the narrow places always adjoin at least one notch, their deformations affect the degree of opening of the notch in question. In summary, the two edges of each notch will deviate or approach depending on the deformations of the narrow places. It will be understood that the simultaneous separation of the edges of the internal notches results in an elongation of the internal side of the elastic part, whereas the simultaneous separation of the edges of the external notches results in an elongation of its external side. Finally, a simultaneous separation of the edges of the inner notches and the edges of the outer notches results in a general elongation of the elastic part.
Conformément à un mode de réalisation particulier, la partie de liaison présente un côté intérieur dont la forme est complémentaire de celle de l'axe et un côté extérieur dont la portion centrale n'est pas déformée de manière significative lors du chassage.According to a particular embodiment, the connecting part has an inner side whose shape is complementary to that of the axis and an outer side whose central portion is not significantly deformed during driving-in.
Le chassage d'un axe est associé à un allongement de la partie élastique. On comprendra qu'il en résulte une distorsion non négligeable de la forme extérieure de l'élément en forme de plaquette ajourée. Dans ces conditions, il est avantageux que la partie de liaison ne soit que peu déformée. En effet, cette caractéristique permet d'absorber les variations géométriques dues aux tolérances sans provoquer de variations sensibles de la position du centre de pivotement relativement au reste du composant.The driving out of a pin is associated with an elongation of the elastic part. It will be understood that this results in a non-negligible distortion of the external shape of the element in the form of a perforated plate. Under these conditions, it is advantageous for the connecting part to be only slightly deformed. Indeed, this characteristic makes it possible to absorb the geometric variations due to the tolerances without causing significant variations in the position of the center of pivoting relative to the rest of the component.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés dans lesquels :
- les
figures 1, 2 et3 sont des vues en plan de trois composants horlogers constitués chacun d'une base et d'un élément rotatif relié à la base par un bras élastique, les trois composants horlogers étant respectivement conformes à un premier, un deuxième et à un troisième mode de réalisation particulier de l'invention ; - les
figures 4 ,5 et 6 sont différentes vues d'un composant horloger conforme à un quatrième mode de réalisation particulier de l'invention.
- the
figures 1, 2 and3 are plan views of three timepiece components each consisting of a base and a rotating element connected to the base by an elastic arm, the three timepiece components being respectively in accordance with a first, a second and a third embodiment particular of the invention; - the
figure 4 ,5 and 6 are different views of a timepiece component according to a fourth particular embodiment of the invention.
La
En se référant toujours à la
Conformément à l'exemple illustré, les encoches intérieures 17 ont la forme d'entailles orientées radialement par rapport à l'axe 10, et elles se terminent chacune par un élargissement circulaire. Leur longueur est comprise entre les trois-quarts et les quatre-cinquièmes de la distance séparant le côté intérieur du côté extérieur. La
Les encoches extérieures 19, quant à elles, présentent sensiblement la forme de demi-lunes dont le rayon est égal à environ un tiers de la distance séparant le côté extérieur du côté intérieur. On peut voir que la proximité entre les encoches intérieures 17 et les encoches extérieures 19 a pour effet de réduire par endroit la distance séparant le bord intérieur de la partie élastique 15 de son bord extérieur. La partie élastique comprend ainsi une succession d'isthmes étroits qui séparent chacun l'extrémité circulaire d'une encoche intérieure 17 du bord en arc de cercle d'une encoche extérieure 19. On comprendra qu'en raison de leur étroitesse, ce sont ces isthmes qui supportent la majeure partie de la déformation lorsque la partie élastique 15 est soumise à des contraintes. On comprendra que le degré d'ouverture des encoches, ou autrement dit l'écartement entre leurs bords, change lorsque les isthmes fléchissent. De plus que l'écartement simultanés des bords de toutes les encoches intérieures résulte en un allongement du côté intérieur de la partie élastique, alors que l'écartement simultané des bords de toutes les encoches extérieures résulte en un allongement de son côté extérieur.The
La
En se référant toujours à la vue en plan de la
Conformément à l'exemple illustré, les encoches intérieures 117 et les encoches extérieures 119 ont la forme d'entailles orientées radialement par rapport à l'axe 110. Les encoches intérieures et les encoches extérieures ont la même longueur. Cette dernière est comprise entre 70 et 80% de la distance séparant le côté extérieur de la partie élastique de son côté intérieur. Comme le montre la
On peut voir que l'interpénétration des encoches intérieures 117 et des encoches extérieures 119 a pour effet de donner à la partie élastique 115 la forme d'un ruban serpentin qui parcourt en zigzag une plage en forme de secteur de couronne comprise entre le cercle intérieur 127 et le cercle extérieur 129. La partie élastique 115 comprend ainsi une série de tronçons droits qui séparent chacun une encoche intérieure 117 d'une encoche extérieure 119, une première série de tronçons en « U » séparant chacun l'extrémité d'une encoche extérieur 119 du côté intérieur de la partie élastique, et enfin une seconde série de tronçon en « U » séparant chacun l'extrémité d'une encoche intérieure 117 du côté extérieur. On comprendra que chaque tronçon droit est rattaché par une première extrémité à un tronçon en « U » de la première série, et par sa seconde extrémité à un tronçon en « U » de la seconde série. De sorte que les tronçons forment tous ensemble une chaîne unique. On comprendra de plus qu'en raison de leur étroitesse, chacun de ces tronçons est susceptible de se déformer élastiquement en flexion lorsque la partie élastique 115 est soumise à des contraintes. Réciproquement, lorsque les différents tronçons sont déformés, la partie élastique subit elle-même une déformation qui est la résultante des déformations des tronçons individuels. Comme déjà mentionné, les tronçons forment les bords des encoches intérieures et extérieures. Dans ces conditions, le degré d'ouverture des encoches, ou autrement dit l'écartement entre les bords de celles-ci, change lorsque les tronçons fléchissent. On comprendra de plus que l'écartement simultanés des bords des encoches intérieures résulte en un allongement du côté intérieur du secteur extensible, alors que l'écartement simultané des bords des encoches extérieures résulte en un allongement de son côté extérieur. Enfin, l'écartement simultané des bords des encoches intérieures et extérieures résulte en un allongement général de la partie élastique 115.It can be seen that the interpenetration of the
La
Les
Les deux parties de liaison 313a, 313b, quant à elles, comportent chacune un côté intérieur en arc de cercle et un côté extérieur formé de deux segments rectilignes qui s'étendent de part et d'autre d'une large encoche centrale (référencées respectivement 335a et 335b). L'encoche centrale de chacune des parties de liaison 313a, 313b est orientée radialement. La
Les dimensions des quatre secteurs de couronne sont choisies de manière que les bords de l'ouverture 311 exercent sur l'axe 310 une force élastique de serrage d'intensité suffisante pour engendrer un couple de liaison statique ayant pour effet d'assujettir l'élément 325 à l'axe 310, aussi longtemps que le couple de transmission du mobile demeure inférieur au couple de liaison statique. On comprendra que la valeur du couple de liaison statique correspond à la valeur maximum que peut prendre le couple de transmission avant glissement. Lorsque le couple de transmission est supérieur au couple de liaison statique, l'élément 25 n'est plus assujetti, mais il est au contraire libre de tourner à friction autour de l'axe 310. La possibilité de mettre en œuvre le composant horloger de l'invention aussi bien au-dessus qu'au-dessous de la limite de glissement donne la possibilité de réaliser par exemple des embrayages à glissement. Comme déjà mentionné, la
Comme le montre les figures, la roue 308 est une roue dentée percée d'un trou central 321 permettant le passage de l'axe 310. La face supérieure de la planche de la roue 308 présente une grande creusure circulaire 323 à fond plat qui est concentrique avec le trou central. L'élément 325 en forme de plaque ajourée est fixé sur le fond de la creusure 323. On peut voir que les deux tenons 331, 333 qui servent à solidariser l'élément 325 avec la roue 308 sont chassés dans deux trous de fixation qui sont percés à travers le fond de la creusure de part et d'autre du trou central 321. Les tiges cylindriques 337 des tenons 331, 333 sont insérées latéralement dans les encoches 335a, 335b de sorte que chacune des parties de fixation 313a, 313b est prise en sandwich entre le fond de la creusure 323 et la tête 339 d'un des tenons 331, 333. On comprendra donc que la liaison entre la roue 308 et les parties de liaison 313a, 313b n'a qu'un seul degré de liberté, et que les parties de liaison peuvent uniquement se déplacer radialement en direction de l'un ou l'autre des deux trous de fixation.As shown in the figures, the
En se référant plus particulièrement à la vue en coupe longitudinale de la
On comprendra en outre que diverses modifications et/ou améliorations évidentes pour un homme du métier peuvent être apportées au mode de réalisation qui fait l'objet de la présente description sans sortir du cadre de la présente invention définie par les revendications annexées.It will also be understood that various modifications and/or improvements obvious to a person skilled in the art can be made to the embodiment which is the subject of the present description without departing from the scope of the present invention defined by the appended claims.
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP20190761.5A EP3955064A1 (en) | 2020-08-12 | 2020-08-12 | Timepiece component comprising an opening designed for insertion of an axis |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP20190761.5A EP3955064A1 (en) | 2020-08-12 | 2020-08-12 | Timepiece component comprising an opening designed for insertion of an axis |
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EP3955064A1 true EP3955064A1 (en) | 2022-02-16 |
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EP20190761.5A Pending EP3955064A1 (en) | 2020-08-12 | 2020-08-12 | Timepiece component comprising an opening designed for insertion of an axis |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4407381A1 (en) | 2023-01-24 | 2024-07-31 | Patek Philippe SA Genève | Timepiece component |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1584994A1 (en) * | 2004-04-06 | 2005-10-12 | Nivarox-FAR S.A. | Collet without deformation of the spiral fixing radius and fabrication method of such a collet |
EP2743782A1 (en) * | 2012-12-11 | 2014-06-18 | Nivarox-FAR S.A. | Device for assembly by deformation of resilient arms |
EP2755093A2 (en) * | 2013-01-14 | 2014-07-16 | Master Dynamic Limited | Stress-Relief Elastic Structure of Hairspring Collet |
EP3598242A1 (en) | 2018-07-19 | 2020-01-22 | Patek Philippe SA Genève | Cam timepiece mechanism |
CH715369A2 (en) * | 2018-09-21 | 2020-03-31 | Nivarox Sa | Elastic holding member for fixing a timepiece component to a support element. |
-
2020
- 2020-08-12 EP EP20190761.5A patent/EP3955064A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1584994A1 (en) * | 2004-04-06 | 2005-10-12 | Nivarox-FAR S.A. | Collet without deformation of the spiral fixing radius and fabrication method of such a collet |
EP2743782A1 (en) * | 2012-12-11 | 2014-06-18 | Nivarox-FAR S.A. | Device for assembly by deformation of resilient arms |
EP2755093A2 (en) * | 2013-01-14 | 2014-07-16 | Master Dynamic Limited | Stress-Relief Elastic Structure of Hairspring Collet |
EP3598242A1 (en) | 2018-07-19 | 2020-01-22 | Patek Philippe SA Genève | Cam timepiece mechanism |
CH715369A2 (en) * | 2018-09-21 | 2020-03-31 | Nivarox Sa | Elastic holding member for fixing a timepiece component to a support element. |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4407381A1 (en) | 2023-01-24 | 2024-07-31 | Patek Philippe SA Genève | Timepiece component |
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