EP3070544A1 - Bearing for timepiece - Google Patents

Abstract

The invention relates to an anti-shock bearing (1) for a timepiece comprising: - a housing (3) comprising a wall (3b) and a bottom (3a); - an opening (5) in said bottom (3a), said opening (5) being intended to receive a tigeron of an axis; - an elastic member (9) having an outer portion (9a) adapted to position the elastic member (9) in the housing (3), a central portion (9c) provided with a bearing (11, 11 a) located in face of said opening (5), and at least one elastic element (9b) connecting said outer portion (9a) to said central portion (9c); - A counter-pivot (13) located in the housing (3) facing the pad (11, 11 a); - A return spring (17) arranged to exert a force on the counter-pivot (13) to push it towards said bottom (3a) of the housing (3). The outer portion (9a) of the elastic member (9) is held in the housing (3) by friction generated by elastic forces exerted between said outer portion (9a) and the wall (3b) of the housing (3). According to the invention, either a kitten (15) which supports said counter-pivot (13) or the counter-pivot (13) comprises a first bearing surface (15a) arranged to be in contact with said outer portion ( 9a) of the elastic member (9) in the rest position of the bearing (1).

Description

Technical area

The present invention relates to the field of watchmaking. It relates, more particularly, an anti-shock bearing comprising a bearing and a counter-pivot independent of one another.

State of the art

The documents CH 255756 and CH 278334 propose anti-shock bearings in which the pierced stone, which acts as a cushion, is suspended floating in its housing by means of an elastic element. This elastic element is held in position by the support of the kitten who carries the counter-pivot. The counter-pivot is subjected to the effect of a return spring which maintains it and which ensures the axial positioning of the elastic element.

The positioning of the elastic element, and therefore of the pad, is consequently dependent on the kitten. In the case of a large axial or diagonal shock that would raise the counter-pivot and the kitten, the elastic member is no longer held in position by the return spring and the kitten, nor with respect to the housing, nor by report to the counter-pivot. It may therefore happen that the elastic element moves in an undesired manner, either relative to the housing, or relative to the counter-pivot. Therefore, the proper positioning of the breakthrough stone is not guaranteed at all times.

The documents CH 333250 , CH 243388 , CH 333591 and CH 296070 disclose bearings in which at least the pierced stone is supported in the housing by means of a one-piece rubber or elastomer ring. The choice of material for the elastic member of these documents is clearly not satisfactory for long-term use of the bearing. Rubber and elastomers typically degrade over time and because of unavoidable contact with oil, requiring periodic replacement. Moreover, these materials require a simple one-piece ring shape, which is very limited in terms of the possibilities for the optimization of the mechanical properties of the elastic member. An elastic member of modern form, having an outer part, a central part, and at least one elastic element connecting these two, has significantly more freedom compared to a simple ring in terms of its design, and therefore its properties. mechanics according to all degrees of freedom.

The document CH 245429 reveals a bearing comprising a spring element that supports the stone pierced in a central ring. The spring element comprises bosses located at the end of four resilient arms, the bosses taking place in a groove so that they exert a force on the bottom of the latter. The radial positioning of the pierced stone is very sensitive to the tolerances of the four arms, and its mounting is difficult because it requires that the arms are clipped almost simultaneously in the groove. Moreover, this groove serves to position the spring element axially.

The document CH 313812 discloses a bearing in which a kitten carrying both stones is supported by means of an elastic ring comprising bulges extending outwardly and inwardly. This elastic ring has a very low flexibility perpendicular to its plane, and in view of the fact that the single kitten also carries the counter-pivot, an axial displacement between the housing and the elastic element and / or between the elastic element and the elastic element. kitten comes out during an axial shock. Indeed, either the kitten will slide against the inner bulges, or the outer bulges will slide against the housing wall, during an axial impact, or both. This sliding will cause wear of the bulges and / or the kitten and / or housing, and thus the positioning of the pierced stone is not assured in the long term.

The document CH 292136 discloses yet another embodiment of a bearing, wherein the resilient member is constituted by a wire spring. This wire spring is held and positioned axially in the housing being wedged between a shoulder and a ring driven into the housing above the wire spring. This bearing is complex and difficult to disassemble for its maintenance with said ring driven.

The document US 2,700,273 discloses a bearing in which a ring of circular section is at the bottom of the housing and against which a beveled wall of the kitten is supported to position radially, but not axially, the kitten. In case of radial shock, the beveled wall slides on the ring to move the kitten against a spring. The kitten is not attached to the ring, and is free to move relative to the latter, which does not guarantee a good positioning of the pierced stone.

The document FR 2020047 describes a bearing integrated with a racket, and is mounted on the cock through the latter. This bearing is complex and seems very difficult, if not impossible, to implement while maintaining an acceptable tolerance of the position of the pierced stone. The correct positioning of the latter is therefore difficult to ensure.

Finally, the document CH 262967 describes a bearing without a kitten in which an elastic member carrying the pierced stone, a ring-shaped spacer and a counterpane stone are stacked in a housing and are held there by the efforts of a spring ring applied axially on the upper face of the counterpoise stone. These elements are simply placed on each other in the housing with play, which does not ensure their good positioning at any time.

The object of the invention is to provide anti-shock bearings in which the aforementioned defects are at least partially overcome.

Disclosure of the invention

More specifically, the invention relates to a shockproof bearing for a timepiece according to a first independent claim. This bearing comprises a hollow housing comprising a wall and a bottom, and an opening in said bottom of the housing, intended to receive a spindle of an axis, such as an axis of a mobile, for example a balance shaft .

Arranged in the housing is an elastic member comprising an outer portion, adapted to position the elastic member in the housing and having for example substantially the shape of a ring, a central portion comprising a pad located opposite said opening, and at least one elastic element connecting said outer portion to said central portion. The pad comprises, as generally known, a hole for receiving the extension of the axis. The pad may be formed by a separate piece attached to the central portion, such as a pierced stone of synthetic gemstone, a ring of metal material or silicon-based material (such as monocrystalline silicon, its oxide, its nitride, its carbide, also mono-or polycrystalline), or can be come from matter with the central part.

A counter-pivot is located in the housing opposite the pad, and is subjected to a force exerted by a return spring arranged tending to push the pivot against the bottom of the housing, and thus to maintain it in its position. rest. The counter-pivot may be a counter-pivot stone of synthetic precious stone, an element made of metallic material or silicon-based material (such as mono- or polycrystalline silicon, its oxide, its nitride, its carbide, also mono- or polycrystalline).

The outer portion of the elastic member is held in the housing by friction generated by elastic forces exerted between said outer portion and the housing wall. These friction can be the result of a driving under elastic regime, or the result of deformations of additional elastic elements such as elastic tongues or fingers or the like.

According to the invention, either a kitten which supports said counter-pivot, or the counter-pivot itself in the case of a bearing without a kitten, comprises a first bearing surface arranged to be in contact with said outer portion of the elastic member in the rest position of the bearing.

Therefore, the elastic member self-positions in the housing, and regardless of the force of the return spring. In case of significant impact, it limits the risk that the elastic member can move or tilt relative to the housing, and therefore, the positioning of the pad relative to the housing is improved. Furthermore, the first bearing surface ensures good axial positioning of the pivot against the elastic member and thus relative to the pad.

Advantageously, a radial clearance exists between the kitten, if present, and the wall of the housing.

Advantageously, a radial clearance exists between the pivot and the kitten, if present. The side wall of the kitten adjacent to the counter-pivot may be cylindrical or conical, a conical wall particularly facilitating the mounting of the counter-pivot in the kitten.

Each of the aforementioned games simplifies the assembly and disassembly of the bearing.

Advantageously, the kitten, if present, comprises a second bearing surface arranged to be in contact with said central portion of the elastic member when the bearing is in the rest position. This second bearing surface is separated from the first bearing surface by an annular groove located between said first bearing surface and said second bearing surface. This groove preferably has a radial width sufficient for said at least one elastic element remains free from the kitten. This arrangement provides a greater axial distance of contact between the central hole 11a of the pad 11 and the pivot axis. In addition, the second bearing surface serves as a stop to avoid any risk that the pad and the counter-pivot can come into contact during a shock of great importance.

Alternatively, the kitten is not present, the counter-pivot or the elastic member being shaped so that it also takes the functionality of the kitten. In the first case, the counter-pivot itself comprises a first bearing surface arranged to be in contact with said outer portion of the resilient member in the rest position of the bearing. The counter-pivot may also comprise a second bearing surface arranged to be in contact with said central part of the elastic member in the rest position of the bearing, separated from the first bearing surface by an annular groove situated between said first bearing surface bearing surface and said second bearing surface. In the same way as in the case of an embodiment with a kitten, this arrangement provides a greater axial distance of contact between the central hole 11a of the pad 11 and the pivot of the axis, and the second bearing surface serves as a stop to avoid any risk that the pad and the counter-pivot can come into contact during a violent impact.

In the case where no kitten is present, a radial clearance may exist between the pivot and the housing wall, which simplifies the assembly and disassembly of the bearing.

In another embodiment, the outer portion of the elastic member may comprise at least one abutment member projecting in a direction opposite to said bottom, that is to say projecting from the upper surface of the part. exterior. This stop element is adapted to position axially against the pivot when the bearing is in the rest position. This positioning can be made, if necessary, either by directly positioning a counter-pivot without a kitten, or by positioning a kitten which carries a counter-pivot. Thus is proposed another embodiment with or without a kitten which has the advantages of the invention.

The invention also relates to an anti-shock bearing for a timepiece, as defined in a second independent claim. This bearing comprises a housing comprising a wall and a bottom, and an opening in said bottom, said opening being intended to receive a tigeron of an axis, such as a balance shaft.

Arranged in the housing is an elastic member having an outer portion adapted to position the resilient member, a central portion comprising a pad located opposite said opening, and at least one elastic member connecting said outer portion to said central portion. The pad comprises, as generally known, a hole for receiving the extension of the axis. The pad may be formed by a separate piece attached to the central portion, such as a pierced stone of synthetic gemstone, a ring of metal material or silicon-based material (such as monocrystalline silicon, its oxide, its nitride, its carbide, also mono-or polycrystalline), or can be come from matter with the central part.

A counter-pivot is located in the housing in front of the pad, where it is supported by a kitten located in the housing. The counter-pivot is subjected to a force exerted by a return spring arranged to push it in direction of said housing bottom, and thus to maintain it in its rest position. The counter-pivot may be a counter-pivot stone of synthetic precious stone, an element made of metallic material or silicon-based material (such as mono- or polycrystalline silicon, its oxide, its nitride, its carbide, also mono- or polycrystalline).

According to the invention, the outer part of the elastic member, which can take for example substantially the shape of a ring, is fixed to the kitten. This fixing can be obtained by welding, brazing, gluing, pinning. Alternatively, the outer portion of the elastic member may be held in the kitten by friction generated by elastic forces exerted between said outer portion and an inner wall of the kitten by hunting under elastic regime, additional elastic tongues or fingers or similar. Therefore, the elastic member is well positioned relative to the kitten and therefore to the counter-pivot at any time, even in case of shock very important.

It should be noted, moreover, that the skilled person can choose according to his needs and according to the geometry of the bearing and the conditions of use if it is more advantageous to choose a positioning of the elastic member with respect to the housing, or in relation to the kitten and therefore to the pivot.

Advantageously, the kitten comprises an inner shoulder in which said outer portion takes place. The axial positioning of the elastic element relative to the kitten can thus be easily guaranteed.

Advantageously, said shoulder has a height less than the thickness of said outer portion, such that, in the rest position of the bearing, said outer portion is in contact with the bottom of the housing, said kitten remaining out of contact with said bottom of the housing.

It is also possible that the kitten and the counter-pivot came from material and therefore be monoblock, for example in the case of manufacturing by micro-machining.

Advantageously, the bottom of the housing comprises a shoulder arranged to be in contact with the outer portion of the elastic member. Consequently, the elastic element and the central part of the elastic member are not in contact with the bottom of the housing, and applies for any embodiment stated above.

Brief description of the drawings

• Fig. 1 est une vue perspective d'un palier antichoc selon l'invention ;
• Fig. 2 est une vue plan du palier antichoc de la figure 1 ;
• Fig. 3 est une vue en coupe verticale parallèle à l'axe A-A de la figure 2 ;
• Fig. 4 est une vue en coupe verticale parallèle à l'axe B-B de la figure 2 ;
• Fig. 5 et 6 sont des vues semblables aux figures 3 et 4 respectivement, qui représentent un palier antichoc alternatif selon l'invention ;
• Fig. 7 et 8 sont également des vues semblables aux figures 3 et 4 respectivement, qui représentent encore un palier antichoc alternatif selon l'invention ;
• Fig. 9 est une vue perspective coupée et les figures 10-11 sont des vues en coupe d'un autre palier antichoc alternatif selon l'invention ; et
• Fig. 12 est une coupe verticale d'encore une variante d'un palier alternatif selon l'invention.

Other details of the invention will appear more clearly on reading the description which follows, given with reference to the appended drawings in which:

• Fig. 1 is a perspective view of an anti-shock bearing according to the invention;
• Fig. 2 is a plan view of the anti-shock bearing of the figure 1 ;
• Fig. 3 is a vertical sectional view parallel to the axis AA of the figure 2 ;
• Fig. 4 is a vertical sectional view parallel to the axis BB of the figure 2 ;
• Fig. 5 and 6 are views similar to Figures 3 and 4 respectively, which represent an alternative shock bearing according to the invention;
• Fig. 7 and 8 are also views similar to Figures 3 and 4 respectively, which still represent an alternative shock bearing according to the invention;
• Fig. 9 is a cut perspective view and the Figures 10-11 are sectional views of another alternative shockproof bearing according to the invention; and
• Fig. 12 is a vertical section of yet another variant of an alternative bearing according to the invention.

Embodiment of the invention

The Figures 1 to 4 illustrate an anti-shock bearing according to the invention in the rest position. The geometric axis of the bearing is defined as being perpendicular to the intersection of axes AA and BB indicated on the figure 2 . The "radial" and "axial" directions therefore refer to the axis of the landing.

This bearing comprises, as is generally the case, a housing 3 in which are housed the components of the bearing. In the illustrated example, this housing 3 is formed in a cup intended to be secured to a frame member of a watch movement, such as a platinum or a bridge. Alternatively, the housing 3 can be formed directly in the body of a plate or a bridge, by machining it directly. The housing is delimited by a bottom 3a, extending in a plane perpendicular to the axis of the bearing 1, and by a substantially cylindrical wall 3b, which extends perpendicular to the plane of the bottom 3a and parallel to the bearing axis 1.

The housing 3 comprises, as is generally known, a central opening 5 in its bottom 3a, substantially coaxial with the housing, and in which a skewer of a pivot axis (not shown), such as a balance shaft, is intended to take place.

The bottom 3a of the housing 3 comprises a shoulder 7 against which is positioned an elastic member 9. This elastic member comprises an outer portion 9a substantially ring-shaped, a central portion 9c also substantially ring-shaped, and at least one (of preferably two, three or four, larger numbers not being excluded) elastic member 9b connecting the outer portion to the central portion 9c. The shapes and configurations of the elastic elements 9b can be various, such as those disclosed in the documents EP 2 206 022 , CH 704739 on behalf of the applicant. The material of the elastic member may be selected from crystalline or amorphous metals such as steel and nickel, ceramics such as sapphire, alumina, ruby, etc., or a silicon-based material. that is, mono- or polycrystalline silicon, its oxide, its nitride, its carbide or the like, all these compounds being also monocrystalline or polycrystalline.

Unlike the levels disclosed in the documents CH 255756 and CH 278334 mentioned in the preamble, the elastic member 9 is elastically held in the housing. The outer part 9a can be positioned either by driving with elastic deformation, or by additional elastic elements such as tongues or fingers extending outwardly from the outer part 9a, and bearing against the cylindrical wall of the housing 3. The outer portion 9a bears resiliently against the housing wall, which generates mutually complementary forces on the wall and on the outer portion 9a in a substantially radial direction. These forces generate a friction that is sufficient to secure these components with each other during operation of the bearing.

In the center of the central portion 9c of the elastic member 9 is a pad 11, here illustrated in the form of a pierced stone 11 provided with a central hole 11a for receiving the end portion of the axis. As illustrated, this pierced stone 11 is of a conventional kind, in ruby, but may also be formed of a metal ring, or obtained in a silicon-based material (such as monocrystalline or polycrystalline silicon, its oxide, its nitride, its carbide, also mono-or polycrystalline), or the like, and is driven, welded or glued into a corresponding opening in the central portion. Alternatively, such a pierced stone 11 can be integrated in the central portion 9c by growth of the material of the central portion 9c. The central portion 9c may have a continuous or discontinuous circular geometry (for example by being split or formed of several bumps), or of continuous or discontinuous polygonal geometry.

Again alternatively, the pad may have come from one piece with the central portion 9c, that is, formed with a hole in the central portion 9c. In such a case, the central portion 9c adjacent the hole 11a is considered to be the pad 11, which is not necessarily a separate part of the central portion 9c.

The elastic member 9 being positioned on the shoulder 7 of the bottom 3a of the housing 3, and neither the element (s) elastic (s) 9b, nor the central portion 9c, nor the pad 11 being in contact with the bottom 3a of the housing 3, the illustrated bearing is of so-called "floating" type or "without trigger threshold". Alternatively, the element (s) elastic (s) 9b and / or the central portion 9c and / or the pad 11 may be in contact with the bottom 3a, either on a flat face, or on a conical face, as c is generally known, especially in the bearings developed by Gérard Erismann during the 1930s and 1940s.

The bearing 1 according to the invention also comprises a counter-pivot 13, arranged facing the bearing 11, and intended to come into contact with the end of the axis in the event of an axial impact. As illustrated, the counter-pivot 13 is a counter-pivot stone 13 of a classic kind, in ruby, but can also be formed of metal, silicon-based material (such as mono- or polycrystalline silicon, its oxide, its nitride, its carbide, also mono-or polycrystalline), or the like.

The counter-pivot 13 is mounted in a seat 15d suitable provided in a kitten 15 with a radial clearance between these two parts. Alternatively, the counter pivot 13 could also be glued, welded, chased or set in the kitten 15.

The kitten 15 takes place in the housing 3 with a radial clearance, and comprises a first bearing surface 15a shaped such that, in the rest position of the bearing, it comes into contact with the outer portion 9a of the elastic member 9 by the action of a return spring 17. The return spring comprises tabs 17a which bear against the counter-pivot 13 in an axial direction. The mounting of the return spring 17 in notches 21 provided for this purpose in the housing 3 is well known, and it goes without saying that other forms of elastic elements are also possible. These aspects should not be described in more detail.

The fact that the elastic member 9 is held elastically in the housing 3, and not by a force provided by the return spring 17 and transmitted to the outer portion 9a through the kitten 15, decouples the positioning of the In fact, the resilient member 9 is held in good position by itself. In the event of a strong axial shock that would raise the counter pivot 13 and possibly also the kitten 15, the elastic member 9 remains in position against the shoulder 7, without risk of displacement, rotation or deflection of the elastic member 9.

Advantageously, the kitten 15 comprises a second bearing surface 15b shaped so that it comes into contact with the central portion 9c of the elastic member 9 when the bearing is in the rest position. This variant provides, relative to that in which said second bearing surface 15b would be absent (see below), a greater axial distance of contact between the central hole 11a of the pierced pad 11 and the pivot axis. of the mobile. In addition, the second bearing surface 15b serves as a stop to avoid any risk that the two stones 11, 13, or the pad 11 and the pivot against 13, can come into contact during a shock of great importance. Furthermore, the elastic elements 9b remain free at all times, and can not come into contact with the bottom 3a of the housing 3, or with the kitten 15: the kitten is provided with an annular groove 15c for this purpose.

In the illustrated example, the elastic member has a constant height, and therefore the first bearing surface 15a and the second bearing surface 15b of the kitten are substantially in the same plane. In the case where the elastic member 9 does not have a constant height, the situation of the second bearing surface 15b with respect to the first bearing surface 15a can be adapted accordingly.

However, as illustrated in Figures 5 and 6 in views similar to those of Figures 3 and 4 respectively, it is not mandatory that the kitten 15 has this second bearing surface 15b - a deletion of this feature would allow a better refocusing of the pad 11 after a radial shock. Level 1 remains improved over those of the documents CH 255756 and CH 278334 . In these figures, only the reference signs mentioned in the text in connection with these figures have been represented so as not to overload them. The figure 12 also illustrates an embodiment similar to that of Figures 3 and 4 , which differs from the latter in that the seat 15d in which the counter-pivot 13 is positioned comprises a conical side wall, which tightens towards the bottom 3a of the housing 3. This taper facilitates the installation of the counter-pivot 13 in the kitten.

The Figures 7 and 8 illustrate in views similar to those of Figures 3 and 4 respectively, yet another variant of the invention in which no kitten 15 is present. Again, in these figures, only the reference signs mentioned in the text in connection with these figures have been represented so as not to overload these figures.

In the embodiment of Figures 7 and 8 , the elastic member 9 comprises, projecting from the upper surface of its outer portion 9a (that is to say the surface of the side of the counter-pivot 13, and therefore opposite the bottom 3a of the housing 3) at least one positioning stop 9d for axially positioning the counter-pivot 13. This positioning stop 9d can be in the form of a stud or one or more striations. rectilinear or curved, against which / is brought against the pivot 13 by the return spring 17 when the bearing is in the rest position. The positioning stop 9d may be, for example, an annular groove. Moreover, the positioning stop 9d can come from a part or not with the outside part 9a of the elastic member 9.

Therefore, this embodiment has a simple counter-pivot 13 and does not have a kitten. The level proposed in these figures therefore has fewer components than the embodiment of the Figures 1 to 4 and is more economical to implement. Nevertheless, the same principle also applies to an embodiment having a kitten, and this, particularly in the case where the kitten is a simple ring, circular or split, driven flush around the counter-pivot 13.

We can still consider other modifications at the levels of Figures 1-8 without departing from the scope of the invention as defined by the claims.

For example, the counter pivot 13 and the kitten 15 of the embodiment of the Figures 1 to 4 can come from a room for the case where no clearance between these components is deemed necessary, the shape of the kitten 15, and particularly that of the first and second bearing surfaces 15a, 15b and that of the groove 15c being taken over in the form of the counter pivot 13. This variant is not illustrated.

The wall of the housing 3 does not have to be cylindrical, but may comprise protuberances and / or notches, which could influence the direction of the forces exerted between the outer part 9a and the wall of the housing 3.

The Figures 9-11 still illustrate a variant of an anti-shock bearing 1 according to the invention, the figure 9 being a cut perspective view, the figure 10 being a section corresponding to said section, and the figure 11 being a section perpendicular to said section. Again, in these figures, only the reference signs mentioned in the text in connection with these figures have been represented so as not to overload these figures.

Level 1 of Figures 9-11 differs from those Figures 1-8 in that the elastic member 9 is no longer held directly in the housing 3, but is fixed in the kitten 15. This attachment can be achieved by means of the friction generated by elastic forces exerted between said outer portion 9a and the wall of the kitten (hunting, elastic elements, as mentioned above), or by gluing, welding, brazing, pinning or the like.

To this end, the kitten 15 comprises an inner shoulder 15e, arranged in the lower part of its inner periphery 15f. As illustrated in Figures 9 to 11 this inner shoulder is annular, but other shapes are also conceivable depending on the shape of the outer portion 9a of the elastic member 9. In the case of fixing by gluing, welding, pinning or the like, the 15th shoulder interior is superfluous and can be removed.

The inner shoulder 15a has a height less than the thickness of the outer portion 9a, so that the kitten 15 does not come into contact with the bottom 3a of the housing 3. Therefore, the outer portion 9a remains in contact with the the shoulder 7 of the bottom 3a of the housing 3. However, it is also conceivable that said height is greater than said thickness, or that these two are equal.

In order to allow the kitten 15 to move in response to shocks, the periphery 17b of the return spring 17 is not in contact with the kitten or against the pivot 13 in its rest position. Nevertheless, said periphery 17b can serve as an axial stop to limit the axial displacement of the kitten 15 during a strong impact.

In the illustrated case, the counter-pivot 13 is driven, welded, brazed or glued into the upper part of the kitten 15, which is tubular in shape, but it is also possible for the counter-pivot 13 to take a position against a suitable shoulder, as is the case in Figures 1 to 6 , with or without play between these two elements.

It goes without saying that, similarly to the case described above in relation to the level of Figures 1 to 4 , the counter-pivot 13 and the kitten 15 can come from material and therefore be monobloc, the counter-pivot 13 therefore taking the form of the assembly against pivot 13 - kitten 15 as it is visible in the Figures 9 to 10 . This reduces the number of bearing parts in case of micro-machining

Claims (15)

Anti-shock bearing (1) for a timepiece comprising: - a housing (3) comprising a wall (3b) and a bottom (3a); - an opening (5) in said bottom (3a), said opening (5) being intended to receive a tigeron of an axis; - an elastic member (9) having an outer portion (9a) adapted to position the elastic member (9) in the housing (3), a central portion (9c) comprising a pad (11, 11 a) located in front of said opening (5), and at least one resilient member (9b) connecting said outer portion (9a) to said central portion (9c); - A counter-pivot (13) located in the housing (3) in front of the pad (11, 11a); - a return spring (17) arranged to exert a force on the counter-pivot (13) to push it towards said bottom (3a) of the housing (3); wherein the outer portion (9a) of the elastic member (9) is held in the housing (3) by friction generated by elastic forces exerted between said outer portion (9a) and the wall (3b) of the housing (3). )
characterized in that either a kitten (15) supporting said counter pivot (13) or the counter pivot (13) comprises a first bearing surface (15a) arranged to be in contact with said outer portion (9a). ) of the elastic member (9) in the rest position of the bearing (1). Anti-shock bearing (1) according to claim 1, wherein said bearing comprises said kitten (15), and wherein a radial clearance exists between the kitten (15) and the wall (3b) of the housing (3). Anti-shock bearing (1) according to one of claims 1 and 2, wherein said bearing comprises said kitten (15), and wherein a radial clearance exists between the pivot (13) and the kitten (15). Anti-shock bearing (1) according to claim 3, wherein the side wall of the kitten adjacent the counter-pivot (13) is cylindrical or conical. Anti-shock bearing (1) according to one of claims 1 to 4, wherein said bearing comprises said kitten (15), and wherein the kitten (15) comprises a second bearing surface (15b) arranged to be in contact with said central portion (9c) of the elastic member (9) in the rest position of the bearing (1), an annular groove (15c) being located between said first bearing surface (15a) and said second bearing surface ( 15b), said groove (15c) having a radial width sufficient for said at least one elastic element (9b) remains free from the kitten (15). Anti-shock bearing (1) according to claim 1, wherein said counter-pivot (13) comprises said first bearing surface (15a), and in which a radial clearance exists between the counter-pivot (13) and the wall (3b ) of the housing (3). Anti-shock bearing (1) according to one of claims 1 and 6, wherein said counter-pivot (13) comprises said first bearing surface (15a), and wherein said counter-pivot (13) comprises a second surface of support arranged to be in contact with said central portion (9c) of the elastic member when the bearing (1) is in the rest position, said counter pivot (13) comprising an annular groove located between said first bearing surface and said second bearing surface, said groove having a radial width sufficient for said at least one elastic element (9b) remains free relative to the counter-pivot (13). Anti-shock bearing (1) according to claim 1, wherein the outer portion (9a) of the elastic member (9) comprises at least one abutment element projecting in a direction opposite to said bottom (3a), said element of stop being adapted to axially position said counter-pivot (13) when the bearing (1) is in the rest position. Anti-shock bearing (1) for a timepiece comprising: - a housing (3) comprising a wall (3b) and a bottom (3a); - an opening (5) in said bottom (3a), said opening (5) being intended to receive a tigeron of an axis; - an elastic member (9) having an outer portion (9a) adapted to position the elastic member (9), a central portion (9c) comprising a pad (11, 11a) facing said opening (5), and at least one elastic element (9b) connecting said outer portion (9a) to said central portion (9c); - A counter-pivot (13) supported by a kitten (15) located in the housing (3), the counter-pivot (13) being opposite the pad (11, 11a); - a return spring (17) arranged to exert a force on the counter-pivot (13) to push it towards said bottom (3a) of the housing (3); characterized in that the outer portion (9a) of the resilient member (9) is attached to the kitten (15). Anti-shock bearing (1) according to claim 9, wherein the outer portion (9a) of the elastic member (9) is fixed to the kitten (15) being held in the kitten (15) by friction generated by elastic forces exerted between said outer portion (9a) and an inner wall (15e) of the kitten (15). Anti-shock bearing (1) according to one of claims 9 to 10, wherein the kitten comprises an inner shoulder in which said outer portion (9a) takes place. Anti-shock bearing (1) according to claim 11, wherein said shoulder has a height less than the thickness of said outer portion (9a), so that, in the rest position of the bearing (1), said outer portion is in contact with the bottom (3a) of the housing (3), said kitten (15) remaining out of contact with said bottom (3a) of the housing (3). Anti-shock bearing (1) according to one of claims 9 to 12, wherein the kitten (15) and the counter-pivot (13) are integral. Anti-shock bearing (1) according to one of claims 1 to 13, wherein the bottom (3a) of the housing (3) comprises a shoulder (7) arranged to be in contact with the outer portion (9a) of the elastic member (9). Anti-shock bearing (1) according to one of claims 1 to 15, wherein said outer portion (9a) has substantially the shape of a ring.

Images