Patent Application
20120113767
This application claims priority from European Patent Application No. 10190511.1 filed Nov. 9, 2010, the entire disclosure of which is incorporated herein by reference.
The invention concerns an anti-shock device for the protection of a timepiece component, made of material that is at least partially magnetically permeable or respectively at least partially magnetic, and/or of material that is at least partially conductive or respectively at least partially electrized, wherein said component is pivotally mounted in a chamber between a first end and a second end of said component.
The invention also concerns an anti-shock device of this type for the protection of a timepiece component, made of material that is at least partially magnetically permeable, or at least partially magnetic at a first end and at a second end.
The invention further concerns an anti-shock device of this type for the protection of a timepiece component, made of material that is at least partially conductive, or at least partially electrized at a first end and at a second end.
The invention also concerns a magnetic and/or electrostatic pivot, including a timepiece component, made of a material that is at least partially magnetically permeable or at least partially magnetic at a first end and at a second end, or respectively at least partially conductive or at least partially electrized at a first end and at a second end.
The invention also concerns a timepiece including at least one anti-shock device of this type, and/or at least one magnetic and/or electrostatic pivot of this type.
The invention further concerns a timepiece including at least one timepiece movement of this type, and/or at least one anti-shock device of this type, and/or at least one magnetic and/or electrostatic pivot of this type.
The invention concerns the field of micro-mechanics and in particular horology, to which it is particularly well suited.
Horological technique employs conventional solutions to ensure the anti-shock functions of timepiece components, such as a balance. These solutions are based on the elastic and viscoelastic response of parts having an anti-shock function and on the mechanical friction between the anti-shock devices and the component to be protected. Conventional anti-shock devices are characterized, in particular, by an acceleration threshold below which the anti-shock device is not deformed and by a function of radially re-centring the component after the shock, which is relatively inaccurate.
The problems to be solved are thus as follows:
DE Patent 12 11 460 in the name of SIEMENS AG is known, which discloses a component, formed by a pin integral with an internal tubular magnet, inserted into an external tubular magnet. The external tubular magnet can move inside a cartouche, coaxial to the two magnets, against a support surface in abutment at one end, and against a spring held by a bush at the other end. This component is also axially guided on a spindle integral with the bush. At each axial end, the component includes a protective sleeve for the fragile ceramic core formed by the internal magnet. The means for guiding pivoting is formed by the cooperation between the two internal and external tubular magnets. However, the holding of the component on the first pole piece is not equivalent to a support since there is a connection between this component and the internal tubular magnet, via a flange and one of the two sleeves. Consequently, the component of this patent is not free relative to the first pole piece formed by the internal magnet, but only relative to the second pole piece, formed by the external magnet.
Another Patent, DE 19854063A1, in the name of VLADIMIR JAGMANN is known, which discloses a component made of magnetisable material levitated between two pole pieces, which generate a magnetic field which is always in a perpendicular direction to the pull of gravity, the orientation by working is always the same.
To overcome the limits of the prior art, the invention proposes a configuration for protecting a component, and particularly a timepiece component, pivotally mounted between holding means either with or without contact.
The essential feature is the mobility of this holding means, whose normal operating position is a position of stable equilibrium, this holding means can move, relative to a structure, under the effect of a strong acceleration created by a shock, so as to preserve the integrity of the component and its environment.
The invention therefore concerns an anti-shock device for the protection of a timepiece component, made of material that is at least partially magnetically permeable, or respectively at least partially magnetic, and/or of material that is at least partially conductive, or respectively at least partially electrized, wherein said component is pivotally mounted in a chamber between a first end and a second end of said component, characterized in that said anti-shock device includes, on both sides of said first and second ends, on the one hand means for attracting said first end to keep said first end abutting on a first pole piece, and on the other hand, in proximity to a second pole piece, means for attracting said second end towards said second pole piece, and in that said means for attracting said first end on the one hand and said means for attracting said second end, on the other hand, can move along an axial direction between stop members, and further characterized in that said first pole piece and said second pole piece are distinct from said component, and are each located on the periphery of or in proximity to said chamber, and are each made of material that is at least partially magnetic, or respectively at least partially magnetically permeable, and/or of material that is at least partially electrized or respectively at least partially conductive, and further characterized in that said component is freely mounted inside said chamber between said pole pieces, so as to rest on a support surface in proximity to only one of said pole pieces.
According to a feature of the invention, this anti-shock device includes means for damping the movement of at least one or each of said pole pieces, and/or means for elastically returning at least one or each of said pole pieces, said damping means and/or said elastic return means being arranged to absorb the energy transmitted to said pole pieces in the event of a shock, and, after said shock, to return at least one or each of said pole pieces to the position of stable equilibrium occupied thereby prior to said shock. The good positioning and centering are established by magnetic or electrostatic forces and not by the elastic return forces.
In a particular embodiment, it is proposed to make an anti-shock system for a timepiece component, for example a balance staff, based on magnetic interaction. For typical timepiece dimensions and using commercially available micro-magnets, it is possible to generate magnetic forces greater than the force of gravity and the torque acting on the component during operation. A system governed by magnetic forces is supposed to be capable of returning exactly to its position of magnetic equilibrium after a shock.
The invention therefore also concerns an anti-shock device of this type for the protection of a timepiece component, made of material that is at least partially magnetically permeable, or at least partially magnetic at a first end and at a second end, characterized in that it includes, on both sides of said first and second ends, at a greater air-gap distance, by the value of a determined operational play, than the distance of centres between said first end and said second end, a first surface of a first pole piece and a second surface of a second pole piece, wherein said magnetic poles pieces are arranged either each to be attracted by a magnetic field transmitted by one of said first or second ends of said component, or each to generate a magnetic field attracting one of said first or second ends of said component, and wherein said magnetic fields have a different intensity at said first end and said second end, such that the magnetic attraction forces being exerted on said component at the two ends thereof are of different intensity, so as to attract said component via one of the said two ends thereof, in direct or indirect contact onto only one of said surfaces of said pole pieces, and in that said first pole piece and said second pole piece can each move inside a chamber between two stop members.
The invention also concerns an anti-shock device of this type for the protection of a timepiece component, made of material that is at least partially conductive or at least partially electrized at a first end and at a second end, characterized in that it includes, on both sides of said first and second ends, at a greater air-gap distance, by the value of a determined operational play, than the distance of centres between said first end and said second end, a first surface of a first pole piece and a second surface of a second pole piece, wherein said magnetic poles pieces are arranged either each to be attracted by an electrostatic field transmitted by one of said first or second ends of said component, or each to generate an electrostatic field attracting one of said first or second ends of said component, and wherein said electrostatic fields have a different intensity at said first end and said second end, such that the electrostatic attraction forces being exerted on said component at the two ends thereof are of different intensity, so as to attract said component via one of the said two ends thereof, in direct or indirect contact onto only one of said surfaces of said pole pieces, and in that said first pole piece and said second pole piece can each move inside a chamber between two stop members. The invention also concerns a magnetic and/or electrostatic pivot including a timepiece component, made of a material that is at least partially magnetically permeable or at least partially magnetic at a first end and at a second end, or respectively at least partially conductive or at least partially electrized at a first end and at a second end, including an anti-shock device of this type.
The invention also concerns a timepiece including at least one anti-shock device of this type, and/or at least one magnetic and/or electrostatic pivot of this type.
The invention further concerns a timepiece including at least one timepiece movement of this type and/or at least one anti-shock device of this type, and/or at least one magnetic and/or electrostatic pivot of this type.
Other features and advantages of the invention will appear upon reading the following description, with reference to the annexed drawings, in which:
Thus, the invention concerns an anti-shock device 10 for the protection of a timepiece component 1 pivotally mounted between a first end 2 and a second end 3.
This anti-shock device 10 includes, on both sides of said first end 2 and second end 3, on the one hand, means for guiding the pivoting of or means for attracting first end 2, held abutting on a first pole piece 4, distinct from component 1 and, on the other hand, in proximity to a second pole piece 6, distinct from component 1, means for guiding the pivoting of the second end 3 or means for attracting said second end 3 to the second pole piece 6.
Component 1 is, at least in proximity to the first end 2 and the second end 3 thereof, preferably made of a magnetically permeable and/or conductive material. In a particular embodiment of the invention, this material is also magnetised and/or electrized.
Component 1 can move in a chamber 1A. A “pole piece” means a mass, which, at least in proximity to chamber 1A, is made of a magnetically permeable and/or conductive material, or, in a particular, preferred embodiment of the invention, in a magnetised and or electrized material. The pole piece 4 or 6 does not form part of component 1, and is thus located at the periphery of or in proximity to chamber 1A:
The first pole piece 4 and the second pole piece 6 are distinct from component 1 and are each located at the periphery of or in proximity to chamber 1A and are each made of at least partially magnetic, or respectively at least partially magnetically permeable material, and/or at least partially electrized, or respectively at least partially conductive material. Component 1 is freely mounted in chamber 1A between pole pieces 4 and 6 so as to rest on a support surface in proximity to only one of these pole pieces 4, 6.
According to a particular feature of the invention, the pivoting guide means or the attraction means for first end 2 on the one hand, and the pivoting guide means or the attraction means for second end 3 on the other hand, can move along an axial direction D between stop members.
In the preferred embodiment of the invention, this anti-shock device 10 includes, on both sides of first end 2 and second end 3, on the one hand, means for attracting first end 2 to hold said first end 2 in abutment on a first pole piece 4, and on the other hand, in proximity to a second pole piece 6, means for attracting said second end 3 towards the second pole piece 6, and the means for attracting the first end 2, on the one hand, and the means for attracting said second end 3 on the other hand, can move along an axial direction D between stop members.
This axial direction D is illustrated in the Figures in the particular case in which it is linear. It may also be curvilinear. But the direction of mobility has to coincide with the flow direction of the magnetic or electrostatic field.
Advantageously, this anti-shock device 10 preferably includes means for damping the movement of at least one or of each of pole pieces 4, 6 and/or means for elastically returning at least one or each of pole pieces 4, 6. This damping means and/or this elastic return means are arranged to absorb the energy transmitted to pole pieces 4, 6 in the event of a shock, and after said shock, to make easier to return at least one or each of pole pieces 4, 6 to a position of stable equilibrium occupied thereby prior to said shock.
The good repositioning in the stable position is guaranteed by the magnetic or electrostatic forces.
In a particular embodiment, as seen in
In a particular embodiment, anti-shock device 10 includes this damping means, which is of the viscous friction type.
In a particular embodiment, anti-shock device 10 includes this damping means, which includes a compressible fluid between the pole piece 4, 6 concerned and a stop member 42, 44, which limits the travel thereof to the opposite side to component 1.
Particularly, according to the invention, as seen in
Preferably and advantageously, anti-shock device 10 includes means for damping the movement of each of pole pieces 4, 6 in their respective chamber.
In a particular embodiment, as seen in
Preferably, this deformable shape memory shock-absorber 23, 24 is made of neoprene.
In a particular embodiment, anti-shock device 10 may include both damping means and elastic return means, which are distinguished by their time constant, the return to a position of stable equilibrium being slower with the damping means than with the elastic return means.
In a particular embodiment, anti-shock device 10 may include one or more damping means made of a magnetic material with a form memory, in addition or in substitution to magnetic pole pieces; in this case only one component guarantees both the damping function and the generation of magnetic forces. In an other particular embodiment it may include compressible magnetic fluids or magnetic foams in addition or in substitution to magnetic pole pieces, to guarantee both the damping function and the generation of the canalization of the magnetic flow.
In a preferred embodiment and as seen in the Figures, the axial direction D is linear.
In a preferred embodiment, component 1 is made of material that is at least partially magnetically permeable, or at least partially magnetic at a first end 2 and at a second end 3.
According to the invention, anti-shock device 10 then includes, on both sides of first end 2 and second end 3, at an air-gap distance which is greater, by the value of a determined operational play J, than the distance of centres between first end 2 and second end 3, a first surface 5 of a first pole piece 4 and a second surface 7 of a second pole piece 6.
These pole pieces 4, 6 are arranged either each to be attracted by a magnetic field emitted by one of first end 2 or second end 3 of component 1, or each to generate a magnetic field attracting one of first end 2 and second end 3 of component 1. These magnetic fields have different intensity at first end 2 and second end 3, such that the magnetic attraction forces being exerted on component 1 at the two ends 2, 3 thereof are of different intensity, so as to attract component 1 via one of the two ends 2, 3 thereof, in direct or indirect contact onto a single one of surfaces 5, 7 of pole pieces 4, 6.
The fluid or foam may also be amagnetic. A deformable damper with form memory may also be amagnetic.
Preferably, first pole piece 4 and second pole piece 6 are each made of magnetic or magnetically permeable material and are magnetic if component 1 is not magnetic. First pole piece 4 and second pole piece 6 preferably together define an axial direction D, on which a longitudinal arbour of component 1 is aligned, joining the first end 2 and second end 3 thereof, when component 1 is inserted between first pole piece 4 and second pole piece 6.
The device is calculated such that the air-gap distance between first surface 5 and second surface 7 are dimensioned to ensure the determined operational play J over the entire range of temperatures of use of anti-shock device 10 and component 1.
These pole pieces 4, 6 may, in particular, be formed of micro-magnets, whose polarities concord, and which define the pivoting of the arbour of component 1. This arbour is supported, either by two jewels inserted between the arbour and the pole pieces or magnets, or by a surface hardening treatment of the pole pieces or magnets.
According to the invention, the two pole pieces 4 and 6 can each move in a chamber limited by stop members, respectively 41, 42 on the one hand, and 43, 44 on the other hand. Their movement occurs according to an axial play, respectively h1 and hz.
The minimum distance between pole pieces 4 and 6 is set by the closest stop members 41 and 43 to the component, whereas the maximum distance is set by the stop members 42, 44 farthest from component 1, here formed by the bottom of the chambers.
The two pole pieces 4 and 6 and component 1 are arranged such that the magnetic forces and torques being exerted on the component are attraction forces, tending to attract component 1 towards contact surfaces 5 and 7 comprised either in pole pieces 4 and 6 or in struts 18, 19, which are inserted between these pole pieces and component 1.
The normal position of the pole pieces is that shown in
The mobility of pole pieces 4 and 6 is preferably impeded by damping means, or elastic return means. The preferred damping means may take various forms.
Or, as visible in
In a preferred embodiment for horology, particularly for damping a balance staff, as seen in
These shock-absorbers, placed on the internal walls of guide chambers for pole pieces 4 and 6 and inside the stop members, are also used for dissipating the kinetic energy from the shock and preventing the pole pieces or magnets colliding with the walls or the rear stop members 42, 44 thereof on impact, or with the closest stop members 41, 43 to component 1 after the shock.
The shock-absorbers may also be designed to form the end stop members themselves, as in the case of
The use of shock-absorbers is however unnecessary, if the axial play and energy of the magnets are sufficiently large, and if the magnets are subjected to viscous friction inside the chamber which ensures that the energy is dissipated.
Conventional radial anti-shock members 32 and 33, visible in
The size and energy of the magnets used, either in pole pieces 4 and 6 or in component 1, or in pole pieces 4 and 6 and in component 1, and the profile of the arbour of component 1 are optimised to produce a considerable force of magnetic attraction towards one of the two pole pieces.
The preferred case in which pole pieces 4 and 6 are magnetic is described more particularly here. They will also be called “magnets”.
The value of the magnetic force is proportional to the magnetisation Maxe (r, z) and to the gradient of the magnetic field H produced by the two magnets:
Integration occurs over the volume of the arbour Vaxe. For all positions of the timepiece, hereinafter the “watch”, the arbour thus abuts on the same magnet. The arbour is also subjected to the magnetic torque Cm:
{right arrow over (C)}
m=−μ0∫d{right arrow over (r)}{right arrow over (M)}axe×{right arrow over (H)}
It is zero only if the arbour is oriented like the field lines, therefore in direction z. If the orientation of the arbour strays from direction z, the return torque Cm reorients the arbour in the proper direction.
The magnetic interaction between the arbour and magnets results in a clear attraction towards magnet 4, greater than gravity.
The magnets have an axial play h1 and h2 respectively, determined by stop members 41, 42 and 43, 44. The axial play allows the energy from the shock to dissipate through the movement of the magnets. The function of radial shock-absorbers 32 and 33 is to prevent the arbour from leaving the area of magnetic influence, and they have no contact with component 1 when the latter is operating normally. This property is valid for all of the watch positions, and thus also for the vertical position.
Optimising the geometrical features of the parts has two results:
These two properties ensure that the configuration shown is stable equilibrium in the absence of any shocks and that this position of stable equilibrium is obtained again after a shock.
In the event of a radial shock, the arbour is held in the area of magnetic influence by anti-shock members 32 and 33: after the shock, recentring is ensured by magnetic interaction, which returns the arbour exactly to the centre of the magnets by aligning said arbour perfectly in direction z.
Two situations are possible during an axial shock:
Since the dissipating members act on the movement of the magnets and not on the arbour, the dissipation due to balance pivot friction is almost zero in normal operation. The quality factor of the regulator is thus independent of the anti-shock function and may be much higher than for a conventional mechanical system.
In an alternative configuration, the arbour of the component may itself by a permanent magnet, thereby maximising the magnetic forces and torques.
Substantial advantages result from the features of the invention:
The determined operational play J is strictly positive. Preferably, the determined operational play J is greater than or equal to 0.020 mm.
The magnetic permeability of the material of component 1 is preferably selected and the magnetisation (depending upon the particular case) of first pole piece 4 and second pole piece 6, on the one hand, and/or of component 1 on the other hand, is preferably achieved such that the magnetic fields attracting first end 2 and second end 3 each exert attraction forces on the component that are more than ten times greater than the gravitational force of attraction on component 1.
Preferably, the magnetic field density in proximity to the first surface 5 and second surface 7 is greater than or equal to 100000 A/m.
Anti-shock device 10 also advantageously includes shielding means 20, arranged to prevent the action of any magnetic field with a radial component relative to axial direction D, in proximity to first and second contact surfaces 5 and 7.
In the embodiment of
In a particular embodiment, at least first surface 5 includes a hard coating or is formed by a hard surface of a strut 18 inserted between first pole piece 4 and component 1. Likewise, a strut 19 may be inserted between second pole piece 6 and component 1.
In a particular variant, anti-shock device 10 includes magnetic field loop means between first pole piece 4 and second pole piece 6.
In another embodiment, the attraction between pole pieces 4, 6 and component 1 is electrostatic in nature. The notion of relative permittivity or dielectric constant is then substituted for the notion of magnetic permeability, and the notion of electrostatic field is substituted for that of magnetic field. The design of anti-shock device 10 is entirely similar and is sized according to the permanent electrostatic fields set up between component 1 and pole pieces 4 and 6.
In this version, anti-shock device 10 concerns the protection of a timepiece component 1 made of material that is at least partially conductive or at least partially electrized at a first end 2 and at a second end 3. According to the invention, this anti-shock device 10 includes, on both sides of said first and second ends 2 and 3, at a greater air-gap distance, by the value of a determined operational play J, than the distance of centres between first end 2 and second end 3, a first surface 5 of a first pole piece 4 and a second surface 7 of a second pole piece 6, wherein the magnetic poles pieces 4, 6 are arranged either each to be attracted by an electrostatic field transmitted by one of first end 2 or second end 3 of component 1, or each to generate an electrostatic field attracting one of first end 2 or second end 3 of component 1, and wherein said electrostatic fields have a different intensity at the first end 2 and second end 3, such that the electrostatic attraction forces being exerted on component 1 at the two ends 2, 3 thereof are of different intensity, so as to attract component 1 via one of the two ends thereof, in direct or indirect contact onto only one of surfaces 5, 7 of the pole pieces 4, 6. The first pole piece 4 and second pole piece 6 can each move in a chamber between two stop members 41, 42, or 43, 44 respectively.
In short, in this embodiment which relies on electrostatic forces and torques, it is possible to use a conductive material either for component 1, if pole pieces 4 and 6 are permanently electrized and charged with sufficient energy, or for pole pieces 4 and 6, if it is component 1 which is electrized and charged: this conductive material being polarised by induction in contact or from a distance owing to the parts which are permanently charged. A similar variant is obtained with the use of an insulating or semi-conductor dielectric instead of a conductor: polarisation is then limited to the surface of the dielectric and the force and torque of attraction are less than those which develop when the material is conductive, but still permit use for a watch.
It is also possible, in another embodiment, to combine the action of electrostatic forces and torques and magnetic forces and torques.
Support surface 18A is a polished, concave, spherical sector made in a jewel 18. The jewel is pressed onto a permanent magnet 4, which develops a residual magnetic field about 1 Tesla or higher than 1 Tesla on its surface. Opposite jewel 18, relative to magnet 4, there is arranged a support jewel 43 with a polished convex profile. Jewel 18, magnet 4 and support jewel 43 are inserted together in a setting 40, made for example of amagnetic material like brass oder titanium or made of beryllium copper. Preferably, jewel 19 and support jewel 46 are mounted in setting 40 by tightening or bonding, or by holding means ensuring a hold greater than 1 N. This setting 40 slides freely in a block 41, which has an opening 34 for the passage of first end 2 of component 1, formed here by a sprung balance assembly. This block 41 includes, in proximity to opening 34, a radial anti-shock member or a radial shock-absorber 32, formed in particular by a shoulder that rotates around axis D.
The assembly is assembled such that the first end 2 of component 1 can move in abutment in the convex dome 18A and such that the convex sector of support jewel 43 is at the other end. This external block 41 acts as a stop member when component 1 is subject to shocks.
Preferably, the first end 2 of the component or balance 1 has a curvature, which is less than that of the concave calotte of jewel 18, so as to ensure contact on a single bridge. The concave curvature 18A of jewel 18 decreases the air-gap distance between pole piece 6 and first end 2 of component 1 and thus also forms an oil reservoir.
A similar assembly is placed at second end 3 of component 1. Support surface 19A is a polished, concave, spherical sector made in a jewel 19. The jewel is pressed onto a permanent magnet 6, which develops a residual magnetic field about 1 Tesla on its surface or higher than 1 Tesla. Opposite jewel 19, relative to magnet 4, there is arranged a support jewel 46 with a polished convex profile. Jewel 19, magnet 6 and support jewel 46 are inserted together in a setting 44, made for example of an amagnetic material like brass or titanium, or of beryllium copper. This setting 44 slides freely in a block 45, which has an opening 35 for the passage of second end 3 of component 1. Block 45 includes, in proximity to opening 35, a radial anti-shock member or radial shock-absorber 33, formed, in particular, by a shoulder that rotates around axis D. The assembly is assembled such that the second end 3 of component 1 can move in abutment in the convex dome 19A without contact during working in absence of shocks and such that the convex sector of support jewel 46 is at the other end.
It is clear that the same assembly may be positioned, symmetrically, abutting on support jewel 43, in proximity to the first end 2 of component 1.
Magnets 4 and 6 are preferably permanent Nd—Fe—B magnets, for instance <Vacodym®> by <Vacuumschmelze GmbH>.
In an advantageous embodiment the magnetization or the electrostatic charge of each pole pieces is spatially variable and is dimensioned in order to optimize the norm and/or the direction of magnetic or electrostatic forces applied to component 1.
The invention also concerns a magnetic and/or electrostatic pivot 100 including a timepiece component 1, made of material that is at least partially magnetically permeable or at least partially magnetic at a first end 2 and a second end 3, or respectively at least partially conductive or at least partially electrized at a first end 2 and at a second end 3 and including an anti-shock device 10 of this type.
Preferably, this magnetic and/or electrostatic pivot 100 includes access means for inserting component 1 into the air-gap, or can be dismantled into several parts that include means for cooperating with each other and/or with a bridge 31 and/or a plate 30 to enable component 1 to be assembled in abutment via the first end 2 thereof on a first part, which includes first surface 5 and first pole piece 4, prior to the assembly of a second part, which includes second surface 7 and second pole piece 6.
Advantageously, a magnetic and/or electrostatic pivot 100 like that shown in
If component 1 is animated by a pivoting movement about axial direction D, magnetic and/or electrostatic pivot 100 advantageously includes a component 1 which is dynamically balanced, for the maximum pivoting velocity thereof, about a longitudinal arbour that joins first end 2 and second end 3.
Preferably, the first end 2 of component 1 is arranged with a surface having ponctual contact with first surface 5, the punctual contact surface being locally spherical or conical.
Advantageously, the first surface 5 includes a receiving surface arranged to cooperate with first end 2. The receiving surface is hollow and locally spherical or conical.
In a preferred application to an oscillator, component 1 is a balance whose pivot axis merges with axial direction D.
It is clear that this magnetic and/or electrostatic pivot 100 fitted with an anti-shock device 10 of this type may then adopt different configurations:
Naturally, it is possible to create a configuration with fields of a different nature at the two ends of component 1, magnetic at one end and electrostatic at the other.
The invention also concerns a timepiece movement 1000 including at least one anti-shock device 10 of this type, and/or at least one magnetic and/or electrostatic pivot 100 of this type.
The invention further concerns a timepiece including at least one timepiece movement 1000 of this type and/or at least one anti-shock device 10 of this type, and/or at least one magnetic and/or electrostatic pivot 100 of this type.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10190511.5 | Nov 2010 | EP | regional |
