EP2206022B1 - Shock-absorbing bearing for timepiece - Google Patents
Shock-absorbing bearing for timepiece Download PDFInfo
- Publication number
- EP2206022B1 EP2206022B1 EP08847741.9A EP08847741A EP2206022B1 EP 2206022 B1 EP2206022 B1 EP 2206022B1 EP 08847741 A EP08847741 A EP 08847741A EP 2206022 B1 EP2206022 B1 EP 2206022B1
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- EP
- European Patent Office
- Prior art keywords
- jewel
- organ
- pivot
- pierced
- endstone
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- 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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- 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
- G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
- G04B31/02—Shock-damping bearings
- G04B31/04—Shock-damping bearings with jewel hole and cap jewel
Definitions
- the present invention relates to a bearing for timepieces and more particularly of the type for damping shocks.
- Such bearings are, most frequently, used to ensure the pivoting of the rockers. Indeed, these are provided with small diameter pivots, and therefore delicate. Since, moreover, the mass of the balance is relatively large, the risk is high that a pivot breaks under the effect of a shock.
- the bearings for pivoting a rocker generally comprise two stones, a pierced stone, in which is engaged a pivot of the balance and a pivot-against stone, which serves as a support and limiting the axial displacement of the pivot.
- These stones are made of a nonmetallic hard material such as corundum.
- shock absorbing bearings There are many types of shock absorbing bearings. The most frequently used include a body provided with positioning and sliding surfaces, a pierced stone and a counter-pivot stone together forming a pivot member, these stones being disposed in the body and positioned on the positioning and sliding surfaces. A spring maintains the stones in the rest position, while allowing them to move within a certain limit under the effect of a shock, the axis of the balance then arriving against stops.
- Such bearings have, for example, been sold under the trademark Incabloc ®.
- Shock absorbing bearings are also known in which the elastic members and the pivot members form a whole. They have the advantage of being less expensive.
- the document US 3,942,848 describes a shock absorbing bearing comprising an annular body intended to be driven in a bridge or a plate.
- a spring formed to define a conical housing is attached to the body.
- This housing is a truss inside which a conical pivot of the balance comes to engage.
- pivoting conditions are unfavorable, metal-to-metal pivoting generating significant friction.
- a bearing type crapaudine cooperating with a conical pivot is poorly suited for a timepiece quality, the positioning of the balance is not very accurate.
- shock-absorbing bearings comprising a central part forming a pivoting member and surrounded by a rosette formed in a plate of elastic rigid material.
- the rosette consists of springs extending radially, their central end cooperating with the central part.
- the document EP 1'696'286 discloses a shock absorbing bearing comprising a pivot member provided with a pierced stone and a counter-pivot stone. Said bearing also comprises a fixing member whose purpose is to ensure the mounting of the bearing on a frame. It further comprises an elastic member which connects the pivot member to the fastener.
- the pierced stone, the counter-pivot stone and the elastic member are three distinct elements. The bearing will therefore be relatively difficult to assemble.
- a main object of the present invention is to provide a simplified structure shock-absorbing bearing which can be manufactured largely by photolithography processes associated with either etching processes or material growth processes, while allowing lubrication of pivoting.
- the shock absorbing bearing for a timepiece comprises a pivot member provided with a pierced stone intended to receive a pivot, and a counter-pivot stone, distinct from the stone. breakthrough, forming a support of said pivot. It further comprises a fixing and abutment member for mounting it on a frame and a resilient member connecting the pivot member, and thus the counter-pivot stone and the pierced stone, to the fastener member. and comprising at least one arm.
- said elastic member and one of the two stones of the pivot member are constituted of the same monolithic piece, the stone against pivot being constitutive of said monolithic piece.
- the part is advantageously made of a monocrystalline material. Its manufacture is particularly well controlled when this material is silicon.
- a flat surface being easier to achieve than a curved surface, it is more interesting that it is the counter-pivot stone which is constitutive of the monolithic piece.
- cleaning holes in the counter-pivot stone facilitate the cleaning of the bearing, which is necessary if the latter is lubricated. These holes are offset with respect to the balance shaft.
- the pierced stone on the monolithic piece In order to improve the fixing of the pierced stone on the monolithic piece, it is fixed rigidly to the monolithic piece, advantageously driven in a metal ring.
- the latter may be provided with two pins engaged in a hole made in said monolithic piece. These pins pass through said monolithic piece and are fixed thereto.
- the bearing may, in addition, comprise a fastener provided with two holes arranged so as to each receive one of said pins, in which they are fixed.
- pins and the metal ring can be formed in one piece.
- the pierced stone is fix the pierced stone directly on the monolithic piece.
- the latter is provided with a core in which is housed and fixed said pierced stone, for example by means of glue.
- the monolithic piece has a two-level structure and two elastic members, the counter-pivot stone and the first elastic member constituting the first level, the second elastic member the second level, the pierced stone being integral with said second elastic member.
- the bearing comprises a second monolithic piece in which is fixed said pierced stone.
- the second monolithic piece comprises a peripheral portion, a central portion and a second elastic member formed by arms connecting the peripheral portion to the central portion, the central portion being pierced at its center to form a hole in which the pierced stone is fixed.
- FIG. 1 A first variant of a first embodiment of the invention is represented on the Figures 1 to 3 .
- figures 1 and 2 illustrate a watch movement portion provided with bearings according to the invention, respectively seen in section and from above.
- the movement comprises a frame comprising a plate 10 and a balance bridge 11, bearings 12 and 13 respectively mounted in holes 10a and 11a formed in the plate 10 and the bridge 11. These holes are coaxial, axis AA.
- a rocker 14 is pivotally mounted in the bearings 12 and 13. It comprises an axis 16 provided at its two ends with tigers 17, which carry pivots 18.
- the bearing 12 comprises a fixing member comprising two annular pieces 20 and 22, the piece 22, in the form of a cup, being pierced at its center with a hole 23, a monolithic piece 24 of monocrystalline material, and a pierced stone 26.
- the piece 24, shown from above in perspective on the figure 3 has a round and flat shape. It comprises a central portion 27, a peripheral portion 28, of annular shape, and spirally wound arms, forming an elastic member 29, which connect the central portion 27 to the peripheral portion 28.
- the central portion 27, disc is provided with a hole 27a in which is housed the pierced stone 26, fixed for example by gluing.
- the central portion 27 forms a counter-pivot stone 31 defined by the bottom of the core 27a.
- the counter-pivoting stone 31 constitutes, with the pierced stone 26, a pivoting member 32.
- the portion of the central portion 27 forming the counter-pivot stone 31 is provided with holes 33 offset relative to the axis AA, thus facilitating cleaning of the landing.
- the monolithic piece 24 is interposed between the annular pieces 20 and 22.
- the piece 24, provided with the pierced stone 26, is disposed in the hole 10a of the plate 10, held radially by the wall of the hole 10a and axially by the annular pieces. 20 and 22.
- Such a structure makes it possible to adjust the axial position of the balance 14.
- the bearing 13 comprises a fixing and abutment member 34 consisting of an annular piece in the form of a cup, which defines a housing having an inner cylindrical wall 36 and a flat bearing surface 37 in the bottom of the cup. It is also pierced with a central hole 23. A truncated portion of cone 38 forms the free end of the cup. It retains and positions a mobile bolt carrier 40.
- the bearing 13 also comprises a monolithic piece 24, provided with a pierced stone 26, in all respects similar to that fitted to the bearing 12.
- the piece 24, provided with the pierced stone 26, is fixed in the housing formed by the cylindrical wall 36 and the bearing surface 37, advantageously by gluing. It could also be maintained axially similar to the bearing 12, by a ring driven on the cylindrical wall 36.
- the rocker 14 is pivotally mounted by engagement of the pivots 18 in the hole of the pierced stones 26.
- the rods 17 are engaged in the holes 23.
- the rocker 14 In case of side impact, the rocker 14 is subjected to a force proportional to the acceleration. This force is transmitted to the bearings 12 and 13 via the pivots 18 which bear in the hole of the pierced stones 26. It has the effect of deforming the arms of the elastic member 29 until the axis 16 come to bear, by the rods 17, against the wall of the holes 23. The rocker 14 is then blocked by a portion of its axis which has dimensions much larger than those pivots 18. The structure is thus more robust.
- one of the pivots 18 exerts a pressure on the counter-pivoting stone 31, which has the effect of axially deforming the arms of the elastic member 29.
- the shaft 16 then bears against the plane wall adjacent to and surrounding the hole 23.
- the arms of the elastic member 29 are dimensioned so that the axis 16 comes into contact with the annular parts 22 and 34 when the acceleration reaches about 500 g, both for the axial impact and radial.
- the pierced stone 26 is housed in a ring 42 of metal, for example brass or nickel-based alloy.
- the establishment of the stone 26 in the ring 42 is advantageously by driving.
- the assembly thus obtained can also be driven into the core 27a.
- the stone 26 and the ring 42 can be removed or moved to ensure a suitable distance between the stone 26 and the pivot-pivot stone 31. This distance is important to ensure good resistance of the oil. This is, in fact, retained by capillarity between the stone 26 and the counter-pivot stone 31. If the distance is too small, the amount of trapped oil is low. If, on the contrary, this distance is too great, the trapped oil drop does not hold well in place is likely to be expelled during a shock.
- the stone 26 is not included in the thickness of the monolithic part 24, as is the case in the first variant. It is, on the contrary, interposed between the piece 24 and the annular piece 22, being fixed to the piece 24 by pins 43 engaged in holes in the ring 42 and in the central portion 27 of the monolithic piece 24.
- the pins 43 can be driven into the ring 42 and glued into the piece 24.
- the piece 24 is directly fixed by 10. The piece 22 therefore no longer ensures the axial positioning of the bearing 12. It has more, for function, that to serve as a stop to the shank 17 as explained above.
- pins 43 are attached to the ring 42. It is obvious that they could also be manufactured in one piece with the ring 42, by machining, stamping or adding material.
- FIG. 7 and 8 differs from that of figures 5 and 6 because the pins 43 protrude from the monolithic part 24.
- a ring 44 of metal for example brass or gold, also provided with holes, serves as a housing at the ends of the pins 43. More specifically, the pins 43 are driven in the holes that includes the ring 44. In this way, it serves as a fixing piece, now in place the stone 26 on the part 24.
- the ring 44 can be used to provide an aesthetic function, to represent for example, the logo of the watch as well as to ensure disassembly easier to achieve.
- the monolithic piece 24 comprises, as before, a central portion 27 forming the counter pivot stone 31, and a peripheral portion 28.
- the figures 9 and 10 represent a device according to this embodiment respectively seen in section and from above, and the Figures 11 and 12 the monolithic pieces 24 views on both sides.
- the monolithic piece 24 has a two-level structure with, at the first level, a first set of three arms forming a first elastic member 45 connecting the peripheral portion 28 to the central portion 27, and the second level, three arms forming a second elastic member 46 secured to the peripheral portion 28 and enclosing the pierced stone 26.
- the latter can be fixed to the elastic member 46 by gluing.
- the elastic member 45 and the central portion 27 occupy a first level
- the elastic member 46 and the stone 26 a second level
- the peripheral portion 28 occupies the two levels.
- the arms of the elastic members 45 and 46 have a meandering structure. They could however also have a spiral shape.
- the manufacture of the piece 24 is done, as previously by photolithography and etching techniques.
- a mask is placed on one of the faces of the plate in which the monolithic pieces are made, and this face is chemically etched on a little more than half the thickness.
- the shapes of the constituent parts of the first level are defined.
- the piece is turned over and a mask is arranged to define the structure of the second level.
- the plate is, here too, attacked on a little more than half of the thickness. In this way, the two levels are perfectly defined and independent.
- the monolithic pieces 24 are extracted from the base plate by attacking the periphery over the entire thickness.
- the monolithic parts 24 are fixed to the frame of the movement in a manner identical to the variant shown in the drawings. figures 1 and 2 .
- a third embodiment is shown, in two variants, on the figures 13 and 14 .
- the device comprises, in addition to monolithic pieces 24, second monolithic pieces 47.
- the parts 24 have a constant thickness. They each comprise the peripheral portion 28, the central portion 27 forming the counter pivot stone 31, and arms forming the elastic member 29.
- the pierced stones 26 are each fixed to one of the monolithic pieces 47.
- the latter comprise also a peripheral portion 48, a central portion 49 and an elastic member 51 formed of arms connecting the peripheral portion 48 to the central portion 49, which is pierced at its center, to form a hole 52 in which the pierced stone 26 is fixed, for example by gluing.
- the fasteners 22 and 34 are each provided with two bearing surfaces 53 and 54, on which the monolithic parts 24 and 47 are respectively supported and fixed, for example by means of adhesive points. These members 22 and 34 are themselves respectively driven into the plate 10 and the bridge 11.
- the monolithic pieces 24 and 47 are substantially thicker than in the variant of the figure 13 .
- the monolithic piece 47 is provided with a recess 55 in which is fixed the pierced stone 26.
- This hole 55 is pierced with a central hole 56 and lateral holes 57, one of which is visible in the drawing.
- the holes 57 serve to facilitate cleaning, such as the holes 33 described with reference to the Figures 1 to 3 .
- the monolithic piece 24 is provided with a central stud 58 engaged in the hole 56, with a slight clearance.
- the end of the stud 58 acts as a counter-pivot stone 31.
- this device during axial shocks is the same as for the embodiments described above. This is not the case during radial shocks. With this structure, as long as the shocks are weak, only the elastic member 51 is biased. If the shock is greater, the wall of the hole 56 bears against the stud 58, so that the elastic member 29 is also biased.
- the bearings described above may be the subject of many other embodiments or variants, without departing from the scope of the invention.
- the monolithic parts may be made of silicon or another preferably monocrystalline material easily machinable by photolithography and chemical etching techniques. These parts may, in addition, undergo surface treatments, for example be coated with a diamond layer or be oxidized.
- the two stones 26 and 31 can also both be made monolithically with the elastic member.
- the friction implies that a minimum force must be applied to the pivot to cause a displacement of the central portion 27. In other words, a disturbance generating a force below this minimum force, would not overcome the forces related to friction and the device would not be disturbed.
- the figure 15 proposes an example illustrating such a friction element.
- the pierced stone 26 of the pivoting member 32 comprises around it, a flange 26b whose walls define a first truncated cone.
- the annular piece 34 comprises, around the hole 23 through which the tigeron 17 passes, a cup 50 whose walls define a second truncated cone.
- the walls of the first and second truncated cones are arranged so that, when the resilient arms are in their rest position, they are flush with each other.
- a slight prestress in the axis of pivoting supports the walls of the flange 26b against that of the cup 50.
- the walls are substantially parallel, to avoid shocks between the two truncated cone.
- the angle of the truncated cones may be relatively open, that is to say between about 120 and 180 degrees.
- the value of the angle defines the friction generated between the two truncated cones and therefore the minimum force to be applied to cause a displacement of the central portion 27.
Description
La présente invention a pour objet un palier pour pièces d'horlogerie et plus particulièrement du type permettant d'amortir les chocs.The present invention relates to a bearing for timepieces and more particularly of the type for damping shocks.
De tels paliers sont, le plus fréquemment, utilisés pour assurer le pivotement des balanciers. En effet, ces derniers sont munis de pivots de faible diamètre, et donc délicats. Comme, par ailleurs, la masse du balancier est relativement importante, le risque est grand qu'un pivot casse sous l'effet d'un choc.Such bearings are, most frequently, used to ensure the pivoting of the rockers. Indeed, these are provided with small diameter pivots, and therefore delicate. Since, moreover, the mass of the balance is relatively large, the risk is high that a pivot breaks under the effect of a shock.
Les paliers destinés à assurer le pivotement d'un balancier comprennent généralement deux pierres, soit une pierre percée, dans laquelle est engagé un pivot du balancier et une pierre contre-pivot, qui sert d'appui et de limitation au déplacement axial du pivot. Ces pierres sont réalisées en un matériau dur non métallique tel que le corindon.The bearings for pivoting a rocker generally comprise two stones, a pierced stone, in which is engaged a pivot of the balance and a pivot-against stone, which serves as a support and limiting the axial displacement of the pivot. These stones are made of a nonmetallic hard material such as corundum.
Il existe de nombreux types de paliers amortisseurs de chocs. Les plus fréquemment utilisés comportent un corps muni de surfaces de positionnement et de glissement, une pierre percée et une pierre contre-pivot formant ensemble un organe de pivotement, ces pierres étant disposées dans le corps et positionnées sur les surfaces de positionnement et de glissement. Un ressort maintient les pierres en position de repos, tout en les laissant se déplacer dans une certaine limite sous l'effet d'un choc, l'axe du balancier arrivant alors contre des butées. De tels paliers ont, par exemple, été vendus sous la marque Incabloc ®.There are many types of shock absorbing bearings. The most frequently used include a body provided with positioning and sliding surfaces, a pierced stone and a counter-pivot stone together forming a pivot member, these stones being disposed in the body and positioned on the positioning and sliding surfaces. A spring maintains the stones in the rest position, while allowing them to move within a certain limit under the effect of a shock, the axis of the balance then arriving against stops. Such bearings have, for example, been sold under the trademark Incabloc ®.
On connaît également des paliers amortisseurs de chocs dans lesquels les organes élastiques et les organes de pivotement forment un tout. Ils ont l'avantage d'être moins coûteux.Shock absorbing bearings are also known in which the elastic members and the pivot members form a whole. They have the advantage of being less expensive.
Ainsi, le document US 3'942'848 décrit un palier amortisseur de chocs comportant un corps annulaire destiné à être chassé dans un pont ou une platine. Un ressort formé pour définir un logement conique est fixé sur le corps. Ce logement constitue une crapaudine à l'intérieur de laquelle un pivot conique du balancier vient s'engager. Dans une telle construction, les conditions de pivotement sont peu favorables, le pivotement métal sur métal engendrant des frottements importants. Par ailleurs, un palier de type crapaudine coopérant avec un pivot conique est mal adapté pour une pièce d'horlogerie de qualité, le positionnement du balancier étant peu précis.Thus, the document US 3,942,848 describes a shock absorbing bearing comprising an annular body intended to be driven in a bridge or a plate. A spring formed to define a conical housing is attached to the body. This housing is a truss inside which a conical pivot of the balance comes to engage. In such a construction, pivoting conditions are unfavorable, metal-to-metal pivoting generating significant friction. Furthermore, a bearing type crapaudine cooperating with a conical pivot is poorly suited for a timepiece quality, the positioning of the balance is not very accurate.
Le document
Le document
Par ailleurs, la demande de brevet européenne
Un but principal de la présente invention est de réaliser un palier amortisseur de chocs de structure simplifiée pouvant être fabriqué en grande partie par des procédés de photolithographie associés soit à des procédés de gravure soit à des procédés de croissance de matériau, tout en permettant une lubrification du pivotement.A main object of the present invention is to provide a simplified structure shock-absorbing bearing which can be manufactured largely by photolithography processes associated with either etching processes or material growth processes, while allowing lubrication of pivoting.
Le palier amortisseur de chocs pour pièce d'horlogerie selon un premier mode de réalisation de l'invention comprend un organe de pivotement muni d'une pierre percée destinée à recevoir un pivot, et d'une pierre contre-pivot, distincte de la pierre percée, formant appui dudit pivot. Il comprend, en outre, un organe de fixation et de butée destiné à assurer son montage sur un bâti et un organe élastique reliant l'organe de pivotement, et donc la pierre contre-pivot et la pierre percée, à l'organe de fixation et comprenant au moins un bras. Pour atteindre ce but ledit organe élastique et une des deux pierres de l'organe de pivotement sont constitués d'une même pièce monolithique, la pierre contre pivot étant constitutive de ladite pièce monolithique. La pièce est avantageusement en un matériau monocristallin. Sa fabrication est notamment parfaitement maîtrisée lorsque ce matériau est du silicium.The shock absorbing bearing for a timepiece according to a first embodiment of the invention comprises a pivot member provided with a pierced stone intended to receive a pivot, and a counter-pivot stone, distinct from the stone. breakthrough, forming a support of said pivot. It further comprises a fixing and abutment member for mounting it on a frame and a resilient member connecting the pivot member, and thus the counter-pivot stone and the pierced stone, to the fastener member. and comprising at least one arm. To achieve this goal said elastic member and one of the two stones of the pivot member are constituted of the same monolithic piece, the stone against pivot being constitutive of said monolithic piece. The part is advantageously made of a monocrystalline material. Its manufacture is particularly well controlled when this material is silicon.
Une surface plane étant plus facile à réaliser qu'une surface bombée, il est plus intéressant que ce soit la pierre contre-pivot qui soit constitutive de la pièce monolithique.A flat surface being easier to achieve than a curved surface, it is more interesting that it is the counter-pivot stone which is constitutive of the monolithic piece.
En outre, des trous de nettoyage dans la pierre contre-pivot facilitent le nettoyage du palier, ce qui est nécessaire si ce dernier est lubrifié. Ces trous sont décalés par rapport à l'axe de balancier.In addition, cleaning holes in the counter-pivot stone facilitate the cleaning of the bearing, which is necessary if the latter is lubricated. These holes are offset with respect to the balance shaft.
Afin d'améliorer la fixation de la pierre percée sur la pièce monolithique, celle-ci est fixée rigidement à la pièce monolithique, avantageusement chassée dans une bague métallique. Cette dernière peut être munie de deux goupilles engagées dans un trou pratiqué dans ladite pièce monolithique. Ces goupilles traversent ladite pièce monolithique et y sont fixées.In order to improve the fixing of the pierced stone on the monolithic piece, it is fixed rigidly to the monolithic piece, advantageously driven in a metal ring. The latter may be provided with two pins engaged in a hole made in said monolithic piece. These pins pass through said monolithic piece and are fixed thereto.
Le palier peut, en outre, comporter une pièce de fixation munie de deux trous agencés de manière à pouvoir recevoir chacun l'une desdites goupilles, dans lesquels elles sont fixées.The bearing may, in addition, comprise a fastener provided with two holes arranged so as to each receive one of said pins, in which they are fixed.
Ces goupilles et la bague métallique peuvent être formées d'une seule pièce.These pins and the metal ring can be formed in one piece.
Il est également possible de fixer la pierre percée directement sur la pièce monolithique. Dans ce cas, cette dernière est munie d'une noyure dans laquelle est logée et fixée ladite pierre percée, par exemple au moyen de colle.It is also possible to fix the pierced stone directly on the monolithic piece. In this case, the latter is provided with a core in which is housed and fixed said pierced stone, for example by means of glue.
Dans un autre mode de réalisation, la pièce monolithique présente une structure à deux niveaux et deux organes élastiques, la pierre contre-pivot et le premier organe élastique constituant le premier niveau, le deuxième organe élastique le deuxième niveau, la pierre percée étant solidaire dudit deuxième organe élastique.In another embodiment, the monolithic piece has a two-level structure and two elastic members, the counter-pivot stone and the first elastic member constituting the first level, the second elastic member the second level, the pierced stone being integral with said second elastic member.
Dans un troisième mode de réalisation, le palier comprend une deuxième pièce monolithique dans laquelle est fixée ladite pierre percée. La deuxième pièce monolithique comprend une portion périphérique, une portion centrale et un deuxième organe élastique formé de bras reliant la portion périphérique à la portion centrale, la portion centrale étant percée en son centre pour former un trou dans lequel la pierre percée est fixée. Le cadre de l'invention est défini par les revendications indépendantes 1, 12 et 13 annexées.In a third embodiment, the bearing comprises a second monolithic piece in which is fixed said pierced stone. The second monolithic piece comprises a peripheral portion, a central portion and a second elastic member formed by arms connecting the peripheral portion to the central portion, the central portion being pierced at its center to form a hole in which the pierced stone is fixed. The scope of the invention is defined by the
D'autres caractéristiques de la présente invention apparaîtront plus clairement à la lecture de la description qui va suivre, faite en référence aux dessins annexés, dans lesquels:
- les
figures 1 et2 représentent une première variante, respectivement vue en coupe et de dessus, d'un premier mode de réalisation de la présente invention, - la
figure 3 montre une pièce destinée à équiper un palier tel que représenté sur lesfigures 1 et2 , - la
figure 4 est une vue en coupe d'une deuxième variante du premier mode de réalisation, - les
figures 5 et6 représentent, vue en coupe, une troisième variante du premier mode de réalisation, - les
figures 7 et8 illustrent une quatrième variante du premier mode de réalisation, - les
figures 9 et10 montrent, respectivement vu en coupe et de dessus, un deuxième mode de réalisation, alors que lesfigures 11 et 12 sont des vues en perspective, de dessus et de dessous, d'une pièce équipant le palier de ce mode de réalisation, - les
figures 13 et14 représentent des vues en coupe de deux variantes d'un troisième mode de réalisation; et - la
figure 15 propose une variante supplémentaire d'un mode de réalisation.
- the
figures 1 and2 represent a first variant, respectively seen in section and from above, of a first embodiment of the present invention, - the
figure 3 shows a part intended to equip a bearing as represented on thefigures 1 and2 , - the
figure 4 is a sectional view of a second variant of the first embodiment, - the
figures 5 and6 represent, in sectional view, a third variant of the first embodiment, - the
figures 7 and8 illustrate a fourth variant of the first embodiment, - the
figures 9 and10 show, respectively seen in section and from above, a second embodiment, while theFigures 11 and 12 are views in perspective, from above and from below, of a part equipping the bearing of this embodiment, - the
figures 13 and14 show sectional views of two variants of a third embodiment; and - the
figure 15 proposes a further variant of an embodiment.
Par souci de clarté, de mêmes éléments ont été désignés par les mêmes références dans les différentes figures.For the sake of clarity, the same elements have been designated by the same references in the various figures.
Une première variante d'un premier mode de réalisation de l'invention est représentée sur les
Le mouvement comporte un bâti comprenant une platine 10 et un pont de balancier 11, des paliers 12 et 13 respectivement montés dans des trous 10a et 11a pratiqués dans la platine 10 et le pont 11. Ces trous sont coaxiaux, d'axe AA. Un balancier 14 est monté pivotant dans les paliers 12 et 13. Il comporte un axe 16 muni à ses deux extrémités de tigerons 17, lesquels portent des pivots 18.The movement comprises a frame comprising a
Le palier 12 comporte un organe de fixation comprenant deux pièces annulaires 20 et 22, la pièce 22, en forme de coupelle, étant percée en son centre d'un trou 23, une pièce monolithique 24 en matériau monocristallin, et une pierre percée 26. La pièce 24, représentée vue de dessus en perspective sur la
Comme la pierre percée 26 et la pierre contre-pivot 31 forment un tout difficilement démontable, la partie de la portion centrale 27 formant la pierre contre-pivot 31 est munie de trous 33 décalés par rapport à l'axe AA, facilitant ainsi le nettoyage du palier.As the
La pièce monolithique 24 est intercalée entre les pièces annulaires 20 et 22. La pièce 24, munie de la pierre percée 26, est disposée dans le trou 10a de la platine 10, maintenue radialement par la paroi du trou 10a et axialement par les pièces annulaires 20 et 22. Une telle structure permet d'ajuster la position axiale du balancier 14.The
La pièce monolithique 24 est réalisée dans une plaque de silicium en utilisant les procédés bien connus de photolithographie et de gravure. Les dimensions de cette pièce 24 sont avantageusement comprises dans les limites suivantes :
diamètre 1,50 à 2,50 mm, typiquement 1,80 mm ; 0,20 à 0,30épaisseur mm typiquement 0,25 mm ;- épaisseur des
bras 0,04 à 0,08mm typiquement 0,05 mm ; - longueur de la spirale 180° à 360°, typiquement 270°.
- diameter 1.50 to 2.50 mm, typically 1.80 mm;
- thickness 0.20 to 0.30 mm typically 0.25 mm;
- arm thickness 0.04 to 0.08 mm typically 0.05 mm;
- spiral length 180 ° to 360 °, typically 270 °.
Le palier 13 comprend un organe de fixation et de butée 34 constitué d'une pièce annulaire en forme de coupelle, qui définit un logement comportant une paroi cylindrique intérieure 36 et une surface d'appui plane 37 dans le fond de la coupelle. Il est également percé d'un trou central 23. Une portion en tronc de cône 38 forme l'extrémité libre de la coupelle. Elle retient et positionne un porte-piton mobile 40.The
Le palier 13 comprend également une pièce monolithique 24, munie d'une pierre percée 26, en tout point semblable à celle équipant le palier 12. La pièce 24, munie de la pierre percée 26, est fixée dans le logement que forment la paroi cylindrique 36 et la surface d'appui 37, avantageusement par collage. Elle pourrait également être maintenue axialement de manière similaire au palier 12, par une bague chassée sur la paroi cylindrique 36.The bearing 13 also comprises a
Le balancier 14 est monté pivotant par engagement des pivots 18 dans le trou des pierres percées 26. Les tigerons 17 sont engagés dans les trous 23.The
En cas de choc latéral, le balancier 14 est soumis à une force proportionnelle à l'accélération subie. Cette force est transmise aux paliers 12 et 13 par l'intermédiaire des pivots 18 qui prennent appui dans le trou des pierres percées 26. Elle a pour effet de déformer les bras de l'organe élastique 29 jusqu'à ce que l'axe 16 vienne prendre appui, par les tigerons 17, contre la paroi des trous 23. Le balancier 14 est alors bloqué par une partie de son axe qui a des dimensions beaucoup plus grandes que celles des pivots 18. La structure est donc ainsi plus robuste.In case of side impact, the
En cas de choc axial, un des pivots 18 exerce une pression sur la pierre contre-pivot 31, ce qui a pour effet de déformer axialement les bras de l'organe élastique 29. L'arbre 16 vient alors prendre appui contre la paroi plane adjacente au et entourant le trou 23.In the event of an axial impact, one of the
Les bras de l'organe élastique 29 sont dimensionnés de manière à ce que l'axe 16 entre en contact, par les tigerons 17, avec les pièces annulaires 22 et 34 lorsque l'accélération atteint environ 500g, aussi bien pour un choc axial que radial.The arms of the
Une autre variante du premier mode de réalisation est représentée sur la
Dans une autre variante, représentée sur les
Dans cette variante, la pierre 26 n'est pas comprise dans l'épaisseur de la pièce monolithique 24, comme c'est le cas dans la première variante. Elle est, au contraire, interposée entre la pièce 24 et la pièce annulaire 22, étant fixée à la pièce 24 par des goupilles 43 engagées dans des trous pratiqués dans la bague 42 et dans la portion centrale 27 de la pièce monolithique 24. Avantageusement, les goupilles 43 peuvent être chassées dans la bague 42 et collées dans la pièce 24. Par ailleurs, la pièce 24 est directement fixée par chassage ou collage dans la platine 10. La pièce 22 n'assure donc plus le positionnement axial du palier 12. Elle n'a plus, pour fonction, que de servir de butée au tigeron 17 comme expliqué précédemment.In this variant, the
On relèvera que les goupilles 43 sont rapportées sur la bague 42. Il est bien évident qu'elles pourraient aussi être fabriquées d'une pièce avec la bague 42, par usinage, emboutissage ou adjonction de matière.It will be noted that the
La variante des
Dans le deuxième mode de réalisation, représenté sur les
Dans ce mode de réalisation, la pièce monolithique 24 présente une structure à deux niveaux avec, au premier niveau, un premier ensemble de trois bras formant un premier organe élastique 45 reliant la portion périphérique 28 à la portion centrale 27, et au deuxième niveau, trois bras formant un deuxième organe élastique 46 solidaires de la portion périphérique 28 et enserrant la pierre percée 26. Cette dernière peut être fixée à l'organe élastique 46 par collage. En d'autres termes, l'organe élastique 45 et la portion centrale 27 occupent un premier niveau, l'organe élastique 46 et la pierre 26 un deuxième niveau, et la portion périphérique 28 occupe les deux niveaux.In this embodiment, the
Pour pouvoir fabriquer une telle structure par les techniques photolithographiques, il est nécessaire que les parties constitutives de l'un des niveaux ne se chevauchent pas avec celles de l'autre niveau. Afin de rendre cette exigence bien apparente sur ces figures, les bras des organes élastiques 45 et 46 présentent une structure à méandres. Ils pourraient toutefois aussi avoir une forme de spirale.In order to be able to manufacture such a structure by photolithographic techniques, it is necessary that the constituent parts of one of the levels do not overlap with those on the other level. In order to make this requirement very apparent in these figures, the arms of the
La fabrication de la pièce 24 se fait, comme précédemment par des techniques de photolithographie et de gravure. Dans une première étape, on dispose un masque sur l'une des faces de la plaque dans laquelle sont réalisées les pièces monolithiques, et on attaque chimiquement cette face sur un peu plus de la moitié de l'épaisseur. Lors de cette étape, les formes des parties constitutives du premier niveau sont définies. Au cours de la deuxième étape, la pièce est retournée et un masque est disposé pour définir la structure du deuxième niveau. La plaque est, ici aussi, attaquée sur un peu plus de la moitié de l'épaisseur. De la sorte, les deux niveaux sont parfaitement définis et indépendants. Ensuite, les pièces monolithiques 24 sont extraites de la plaque de base en attaquant la périphérie sur toute l'épaisseur.The manufacture of the
Dans ce mode de réalisation, les pièces monolithiques 24 sont fixées au bâti du mouvement de manière identique à la variante représentée sur les
Avec cette variante les forces engendrées par une action de l'axe du balancier 14 sur la pierre percée 26 ou sur la pierre contre-pivot 31 peuvent être dimensionnées de manière indépendantes.With this variant the forces generated by an action of the axis of the
Un troisième mode de réalisation est représenté, selon deux variantes, sur les
Les pièces 24 ont une épaisseur constante. Elles comprennent chacune la portion périphérique 28, la portion centrale 27 formant la pierre contre-pivot 31, ainsi que des bras formant l'organe élastique 29. Les pierres percées 26 sont fixées chacune sur l'une des pièces monolithiques 47. Ces dernières comprennent aussi une portion périphérique 48, une portion centrale 49 et un organe élastique 51 formé de bras reliant la portion périphérique 48 à la portion centrale 49, laquelle est percée en son centre, pour former un trou 52 dans lequel la pierre percée 26 est fixée, par exemple par collage.The
Cette solution permet aussi d'avoir des organes élastiques indépendants présentant des caractéristiques différentes pour coopérer d'une part avec la pierre 26, d'autre part avec la pierre contre-pivot 31.This solution also makes it possible to have independent elastic members having different characteristics to cooperate on the one hand with the
Les organes de fixation 22 et 34 sont chacun munis de deux portées 53 et 54, sur lesquelles les pièces monolithiques 24 et 47 sont respectivement en appui et fixées, par exemple au moyen de points de colle. Ces organes 22 et 34 sont eux-mêmes respectivement chassés dans la platine 10 et le pont 11.The
Dans la variante illustrée à la
La pièce monolithique 24 est munie d'un plot central 58 engagé dans le trou 56, avec un léger jeu. L'extrémité du plot 58 assure la fonction de pierre contre-pivot 31.The
La fixation des pièces monolithiques 24 et 47 se fait de la même manière que dans la variante représentée à la
Le comportement de ce dispositif lors de chocs axiaux est le même que pour les modes de réalisation décrits précédemment. Ce n'est pas le cas lors de chocs radiaux. Avec cette structure, tant que les chocs sont faibles, seul l'organe élastique 51 est sollicité. Si le choc est plus important, la paroi du trou 56 prend appui contre le plot 58, de sorte que l'organe élastique 29 est également sollicité.The behavior of this device during axial shocks is the same as for the embodiments described above. This is not the case during radial shocks. With this structure, as long as the shocks are weak, only the
Les paliers décrits ci-dessus peuvent faire l'objet de nombreux autres modes de réalisation ou variantes, sans pour autant sortir du cadre de l'invention. On relèvera notamment que les pièces monolithiques peuvent être réalisées en silicium ou en un autre matériau de préférence monocristallin facilement usinable par des techniques de photolithographie et de gravure chimique. Ces pièces peuvent, en outre, subir des traitements de surface, par exemple être revêtues d'une couche de diamant ou être oxydées. Comme évoqué précédemment, il est parfaitement possible de réaliser la pierre percée 26 de manière monolithique avec l'organe élastique, la pierre contre-pivot 31 étant alors agencée en référence à la pièce monolithique à l'instar de ce qui a été décrit ci-dessus à propos de la pierre percée 26. Les deux pierres 26 et 31 peuvent également être toutes deux réalisées de manière monolithique avec l'organe élastique.The bearings described above may be the subject of many other embodiments or variants, without departing from the scope of the invention. It will be noted in particular that the monolithic parts may be made of silicon or another preferably monocrystalline material easily machinable by photolithography and chemical etching techniques. These parts may, in addition, undergo surface treatments, for example be coated with a diamond layer or be oxidized. As mentioned above, it is perfectly possible to make the
Il est également possible de les réaliser en un matériau polycristallin, par exemple par croissance.It is also possible to produce them in a polycrystalline material, for example by growth.
Il peut, en outre, être intéressant de prévoir d'intégrer, au niveau de l'organe élastique 29, un élément de frottement ou d'amortissement, afin d'améliorer la stabilité du dispositif et de couper une éventuelle mise en oscillation des organes élastiques. Naturellement, les frottements engendrés ne doivent nuire à la mobilité de l'organe de pivotement que dans une limite acceptable pour le recentrage de la portion centrale 27 ou 49 et donc de la pierre percée 26, que celle-ci soit réalisée de manière monolithique avec un organe élastique ou non. De manière avantageuse, les frottements impliquent qu'une force minimale doit être appliquée sur le pivot pour engendrer un déplacement de la portion centrale 27. Autrement dit, une perturbation engendrant une force inférieure à cette force minimale, ne permettrait pas de vaincre les forces liées au frottement et le dispositif ne serait pas perturbé.It may, furthermore, be advantageous to provide for integrating, at the level of the
A titre d'exemple, la
Ainsi, lorsqu'une force perturbatrice tendant à induire un déplacement radial, est appliquée sur l'organe de pivotement, cette force doit vaincre les frottements générés entre les parois du premier et du deuxième tronc-de-cônes avant que la partie centrale se déplace radialement. Ceci permet d'améliorer la stabilité des organes de pivotement. On notera que la précontrainte exercée sur la portion centrale 27 entraîne un effet identique dans la direction axiale, c'est-à-dire qu'une force perturbatrice tendant à induire un déplacement axial doit vaincre la précontrainte avant que la partie centrale se déplace axialement.Thus, when a disturbing force tending to induce radial displacement is applied to the pivot member, this force must overcome the friction generated between the walls of the first and second truncated cones before the central portion moves. radially. This improves the stability of the pivot members. It will be noted that the prestressing exerted on the
L'angle des tronc-de-cônes peut être relativement ouvert, c'est-à-dire compris entre 120 et 180 degrés, environ. La valeur de l'angle permet de définir les frottements générés entre les deux tronc-de-cône et donc la force minimale à appliquer pour entraîner un déplacement de la portion centrale 27.The angle of the truncated cones may be relatively open, that is to say between about 120 and 180 degrees. The value of the angle defines the friction generated between the two truncated cones and therefore the minimum force to be applied to cause a displacement of the
En outre, ces frottements permettent également de stopper rapidement les oscillations des bras élastiques en cas de perturbation.In addition, these friction also allow to quickly stop the oscillations of the elastic arms in case of disturbance.
On notera que l'ajout d'une huile ou d'un liquide visqueux entre les bras élastiques peut également permettre d'obtenir un effet semblable.It should be noted that the addition of an oil or a viscous liquid between the elastic arms can also make it possible to obtain a similar effect.
Les différents modes de réalisation décrits ci-dessus permettent ainsi de réaliser des paliers amortisseurs de chocs efficaces et compacts, simples dans leur structure et pouvant être lubrifiés dans de bonnes conditions.The various embodiments described above thus make it possible to achieve efficient and compact shock-absorbing bearings that are simple in their structure and can be lubricated in good conditions.
Claims (14)
- A shock-absorbing bearing for a timepiece movement, comprising:- a pivot organ (32) provided with a pierced jewel (26) intended to receive a pivot (18), and an endstone jewel (31), forming a bearing for said pivot (18), said endstone jewel (31) being separate from said pierced jewel (26),- a fastening and banking organ (20, 22, 34) intended to ensure mounting thereof on a frame,- an elastic organ (29) connecting the pivot organ (32), and therefore the endstone jewel and the pierced jewel, to the fastening organ (20, 22, 34) and comprising at least one arm,characterized in that said elastic organ (29) and one of the two jewels (26, 31) of the pivot organ (32) make up a same monolithic piece (24), said endstone jewel (31) forming part of said monolithic piece (24).
- The bearing according to claim 1, characterized in that the monolithic piece is made from a monocrystalline material.
- The bearing according to claim 2, characterized in that the monocrystalline material is silicon.
- The bearing according to claim 1, characterized in that the endstone jewel (31) is provided with at least one hole (33) offset relative to the balance axis (AA).
- The bearing according to claim 1, characterized in that said pierced jewel (26) is rigidly fastened to said monolithic piece (24).
- The bearing according to claim 5, characterized in that said pierced jewel (26) is driven into a metal ring (42).
- The bearing according to claim 6, characterized in that said ring (42) is provided with two pins (43) engaged in a hole formed in said monolithic piece (24).
- The bearing according to claim 7, characterized in that said pins (43) cross through said monolithic piece (24) and are fastened therein.
- The bearing according to claim 7, characterized in that it further comprises a fastening piece (44) provided with two holes arranged so as to be able each to receive one of said pins (43), in which they are fastened.
- The bearing according to claim 7, characterized in that said pins (43) and said ring (42) are formed as a single piece.
- The bearing according to one of claims 5 or 6, characterized in that said monolithic piece (24) is provided with a recess (27a) in which said pierced jewel (26) is glued.
- A shock-absorbing bearing for a timepiece movement comprising:- a pivot organ (32) provided with a pierced jewel (26) intended to receive a pivot (18), and an endstone jewel (31), forming a bearing for said pivot (18), said endstone jewel (31) being separate from said pierced jewel (26),- a fastening and banking organ (20, 22, 34) intended to ensure mounting thereof on a frame,- a first elastic organ (45) connecting the endstone jewel (31) to the fastening organ (20, 22, 34) and comprising at least one arm,characterized in that said endstone jewel (31) and the first elastic organ (45) constitute a same monolithic piece having a two-level structure, the endstone jewel (31) and the first elastic organ (45) making up the first level, and a second elastic organ (46) making up the second level, the pierced jewel (26) being secured to said second elastic organ (46).
- A shock-absorbing bearing for a timepiece movement comprising:- a pivot organ (32) provided with a pierced jewel (26) designed to receive a pivot (18), and an endstone jewel (31), forming a bearing for said pivot (18), said endstone jewel (31) being separate from said pierced jewel (26),- a fastening and banking organ (20, 22, 34) designed to ensure mounting thereof on a frame,- the first elastic organ (45) connecting the endstone jewel (31) to the fastening organ (20, 22, 34) and comprising at least one arm,characterized in that said endstone jewel (31) and the first elastic organ (45) constitute a first monolithic piece (24) and in that the endpiece comprises a second monolithic piece (47) in which said pierced jewel (26) is fastened, said second monolithic piece (47) comprising a peripheral portion (48), a central portion (49) and a second elastic organ (51) formed from arms connecting the peripheral portion (48) to the central portion (49), the central portion (49) being pieced at its center to form a hole (52) in which the pierced jewel (26) is fastened.
- The bearing according to one of the preceding claims, characterized in that it comprises a friction or damping element tending to oppose a disruptive force oriented so as to cause a movement of the pivot organ.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01726/07A CH705112B1 (en) | 2007-11-07 | 2007-11-07 | shock absorber bearing for a timepiece. |
PCT/EP2008/065144 WO2009060074A1 (en) | 2007-11-07 | 2008-11-07 | Shock-absorbing bearing for timepiece |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2206022A1 EP2206022A1 (en) | 2010-07-14 |
EP2206022B1 true EP2206022B1 (en) | 2015-06-03 |
Family
ID=39620230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08847741.9A Not-in-force EP2206022B1 (en) | 2007-11-07 | 2008-11-07 | Shock-absorbing bearing for timepiece |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2206022B1 (en) |
CH (1) | CH705112B1 (en) |
WO (1) | WO2009060074A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103124935B (en) * | 2010-06-22 | 2015-05-13 | 斯沃奇集团研究和开发有限公司 | Timepiece anti-shock system |
US9292005B2 (en) | 2011-12-12 | 2016-03-22 | The Swatch Group Research And Development Ltd | Shock resistant bearing for a timepiece |
EP2781972B1 (en) * | 2013-03-19 | 2018-08-01 | Nivarox-FAR S.A. | Pivot for clock mechanism |
EP2806314A1 (en) | 2013-05-24 | 2014-11-26 | The Swatch Group Research and Development Ltd. | Shock absorber with bayonet |
CH709867B1 (en) | 2014-07-14 | 2018-12-14 | Mft Et Fabrique De Montres Et Chronometres Ulysse Nardin Le Locle Sa | Anti-shock bearing for a timepiece. |
CH709908A1 (en) * | 2014-07-22 | 2016-01-29 | Richemont Int Sa | Landing shock absorber for a timepiece. |
CH710905A1 (en) | 2015-03-20 | 2016-09-30 | Mft Et Fabrique De Montres Et Chronomètres Ulysse Nardin Le Locle S A | Landing shockproof timepiece. |
WO2018146639A1 (en) * | 2017-02-13 | 2018-08-16 | Patek Philippe Sa Geneve | Timepiece drive member |
EP3770699A1 (en) * | 2019-07-26 | 2021-01-27 | Comadur S.A. | Stone, particularly for clock movement, and method for manufacturing same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3942848A (en) * | 1973-04-06 | 1976-03-09 | Seitz S.A. | Shock absorbing pivot bearing for rotary watch parts |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
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CH235315A (en) * | 1942-09-30 | 1944-11-30 | Erismann Schinz Sa | Bumper for timepiece. |
CH286182A (en) * | 1950-06-19 | 1952-10-15 | Graef Jean Pierre | Bearing for a watch movement mobile. |
FR1585772A (en) * | 1967-10-16 | 1970-01-30 | ||
CH1881071A4 (en) * | 1971-12-23 | 1973-09-28 | ||
FR2279140A1 (en) * | 1973-12-18 | 1976-02-13 | Epsilon Sarl | Resilient bearing mounting especially for instruments - has Z-shaped deformable portion between bearing and housing |
FR2363727A1 (en) * | 1976-09-06 | 1978-03-31 | Cattin Sa Ets | Shock absorbing bearing for watch spindle - has resilient plastic bearing block mounted in circular housing |
DE2854801A1 (en) * | 1977-12-20 | 1979-06-21 | Kif Parechoc Sa | PROCESS FOR MANUFACTURING A METALLIC PIN BEARING OR STONES FOR A BEARING USED IN WATCHMAKING AND FINE MECHANICS AND A STONE OBTAINED BY THE APPLICATION OF THIS PROCESS |
JP3718560B2 (en) | 1996-06-26 | 2005-11-24 | 昭男 平根 | Spot welder |
US6755566B2 (en) * | 2001-02-15 | 2004-06-29 | Konrad Damasko | Clockwork |
CH697017A5 (en) | 2003-03-26 | 2008-03-14 | Franck Muller Watchland S A | Mobile turning to anti-shock device on an axis. |
EP1696286B1 (en) * | 2005-02-23 | 2010-12-29 | ETA SA Manufacture Horlogère Suisse | Shock-damping bearing for timepieces |
-
2007
- 2007-11-07 CH CH01726/07A patent/CH705112B1/en not_active IP Right Cessation
-
2008
- 2008-11-07 WO PCT/EP2008/065144 patent/WO2009060074A1/en active Application Filing
- 2008-11-07 EP EP08847741.9A patent/EP2206022B1/en not_active Not-in-force
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3942848A (en) * | 1973-04-06 | 1976-03-09 | Seitz S.A. | Shock absorbing pivot bearing for rotary watch parts |
Also Published As
Publication number | Publication date |
---|---|
CH705112B1 (en) | 2012-12-31 |
EP2206022A1 (en) | 2010-07-14 |
WO2009060074A1 (en) | 2009-05-14 |
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