EP3291026A1 - Stossdämpfer-gleitlager für eine uhr - Google Patents

Stossdämpfer-gleitlager für eine uhr Download PDF

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Publication number
EP3291026A1
EP3291026A1 EP16186261.0A EP16186261A EP3291026A1 EP 3291026 A1 EP3291026 A1 EP 3291026A1 EP 16186261 A EP16186261 A EP 16186261A EP 3291026 A1 EP3291026 A1 EP 3291026A1
Authority
EP
European Patent Office
Prior art keywords
spring
extension
stone
support
extensions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16186261.0A
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English (en)
French (fr)
Other versions
EP3291026B1 (de
Inventor
Christian Rüfenacht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP16186261.0A priority Critical patent/EP3291026B1/de
Priority to CN201721029367.1U priority patent/CN207133591U/zh
Publication of EP3291026A1 publication Critical patent/EP3291026A1/de
Application granted granted Critical
Publication of EP3291026B1 publication Critical patent/EP3291026B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • 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 shock-absorbing bearing for a timepiece, and more particularly to the bearing of the balance shaft of a mechanical watch, making it possible to prevent the breakage of the small-diameter pivot, situated at its end, termed "tigeron", in the event of an axial or lateral impact, which may simply result from a sudden movement of the wearer's wrist.
  • the mechanical watch manufacturers have long designed numerous devices for absorbing the energy resulting from a shock, including a side impact, by the axis by abutting against a wall of the hole of the base block that it traverses, while allowing a momentary movement of the tigeron before it is brought back to its rest position under the action of a spring.
  • FIGS 1 to 3 illustrate a device, called "inverted double cone" which is currently used in timepieces on the market.
  • a device of this type is for example described in the patent FR 1 532 798 .
  • the kitten 20 is held in a housing 6 of the support block 1 by a spring 10 which comprises in this example radial extensions 9 compressing the counter pivot stone 5.
  • the housing 6 comprises two bearing surfaces 7, 7a in form inverted cones on which support complementary spans 8, 8a of the kitten 20, said staves to be executed with very high accuracy.
  • the spring 10 acts alone to bring the balance shaft 3 back to its initial position.
  • the support block 1 comprises a peripheral rim 11 in which two diametrically opposed openings 11 are made.
  • the present spring is a substantially flat lyre spring 10.
  • a spring comprises a base from which two arms extend. These curved arms are symmetrical and extend to give a lyre shape. Ideally, the arms are arranged to form two parts of the same circle whose center is the center of the lyre spring.
  • Each arm comprises, at its free end, a hook for bearing on protruding portions 11b of the flange extending at the openings.
  • the radial extensions 9 of the spring extend from the inside of the arms.
  • each spring arm is arranged to be bent to form an extension.
  • the extension to an arcuate shape whose interface with the extension is through the concave face of said support head 9 '.
  • This configuration has the disadvantage of having only one fulcrum per arm in all circumstances. This point of contact is in the most rigid part of the extension. This causes an imperfect response of the spring. Indeed, during a weak shock, having a fulcrum in the most rigid part may cause an absorption of energy by the tigeron while in case of significant shocks, no progressivity will be present.
  • the present invention therefore aims to overcome the disadvantages of the aforementioned prior art by providing a shock absorbing bearing comprising a pierced stone and a counter-pivot stone assembled in a kitten suspended by a lyre spring allowing a more progressive response to shocks.
  • the invention relates to a shock absorbing bearing for a tigeron of a mobile axis of a timepiece
  • a support block intended to be driven, fixed or formed in the frame of said part timepiece
  • said support block being provided with a housing adapted to receive an axial deformation spring and a kitten supporting a pierced stone traversed by the tigeron and a counter-pivot stone
  • the spring being arranged in the housing between the kitten and at least one protruding portion of a peripheral rim of the support block, characterized in that the spring is formed by a peripheral ring from which extend at least one extension provided with a bearing head in contact with the stone counter-pivot, this bearing head having an arcuate shape whose interface with the extension is via its convex face.
  • said spring comprises two arc-shaped arms interconnected via a cross-member and having two free ends each comprising a bearing zone, said at least one extension extending from the one both arms.
  • said support head has a curvature greater than that of the arms.
  • said spring is formed of a curved strip in order to achieve internal radial extensions disposed between annular parts, said internal radial extensions carrying the support head.
  • the spring comprises two diametrically opposed extensions.
  • the spring comprises three extensions.
  • the three extensions are regularly distributed.
  • the bearing comprises a support block 1 of circular shape delimiting a housing 6 whose center is pierced with a hole 2 to allow the passage of a balance shaft 200 terminated by a tigeron 202.
  • the support block 1 can be either an independent part driven or fixed by any other means in the frame of the watch movement, or be part of another part of the movement, such as a bridge or a plate.
  • the kitten 20 which supports the pierced stone 4 traversed by the tigeron 3a and the counter-pivot stone 5 is damped by a spring 12.
  • the support block 1 comprises a peripheral flange 9 having two openings 10. These openings 10 are diametrically opposed and allowing the introduction of the spring 12.
  • the peripheral flange 9 comprises protruding portions 11 extending at the level openings. More precisely, the two openings 10 making it possible to have a peripheral rim 9 in two identical parts. Each part comprises, at each end, a projecting portion 11 extending towards the center of the opening. These protruding portions 11 allow the spring 12 to take support.
  • the spring 12 is a ring-shaped spring.
  • the spring 12 is a lyre spring.
  • a spring 12 consists of two arms 12a in the form of circular arc interconnected via a cross member 12b at one of their ends, all forming a peripheral ring shape 12 '.
  • This spring 12 thus has two free ends each comprising a bearing zone 12c.
  • Such a support zone 12c may be in the form of a curvature of each arm at its free end to widen the area.
  • This configuration of the spring allows it to be installed in the housing 6 of the support block. Indeed, once the kitten 20 in place, the spring 12 is installed.
  • the spring 12 is installed so as to press the kitten into the housing while having the cross member 12b and the support zones 12c pressed against the projecting portions 11 of the peripheral rim.
  • the spring 12 comprises at least one extension 13.
  • This extension 13 extends from one of the arms 12a of the spring towards its center. This extension made of material with the spring 12 is used to exert a prestress on the stone against pivot and to bring the kitten into the housing during a shock.
  • the spring 12 is dimensioned so that only the extension is in contact with the stone against pivot. Similarly, the arcuate arms 12a are formed to have the same center and substantially form a circle of center C. This center C also becomes the center of the spring.
  • the extension comprises, at its free end, a bearing head 14 made of material with the extension.
  • This support head 14 has a shape of an arc whose interface with the extension 13 is made via the convex face of said arc.
  • Each support head has a shape of an arc having a curvature greater than that of the arms forming the spring.
  • the radius of the arc forming the support head is therefore greater than if this arc had a radius whose center was the center C of the spring. It is therefore understood that the center C 'of the arc of each arm is offset with the center C of the spring as visible in FIG. figure 7 .
  • the extension with its support head 14 thus has a shape similar to a tee.
  • This design provides a tee-shaped extension 13 whose arms have better contact with the stone against pivot.
  • the support head 14 of the extension 13 advantageously has a reverse curvature compared to that of the prior art described above. This makes it possible to force the contact with the "counter-pivot" stone in the ends since the support head has a shape tending to conform to the shape of the counter-pivot stone.
  • An advantage of this configuration is to have several points of contact. Indeed, the shape of the support head 14 allows it to be, at rest, in contact with the stone against pivot 5 in two places E1 and E2. This increasing the number of points of contact makes it possible to have a better stability of the support on the pivot-pivot stone 5.
  • the kitten 20 is moved by the axis and its tigeron. This displacement of the kitten 20 is damped by the spring 12.
  • This spring 12 under the effect of the constraint exerted by the kitten 20, is deformed.
  • the deformation following a shock has the effect of shifting the contact points E1, E2. These contact points E1, E2 thus tend to approach the center of the support head 14. This shift of the contact points E1, E2 is due to the specific shape of the support head.
  • the central zone of the support head 14 is the most rigid part so that the deformation of this part 14 is less easy. Therefore, the greater the shock and the greater the contact between the extension 13 of the spring 12 and the counter pivot stone 5 is on the most rigid zone of said extension. This allows to obtain a better damping during big shocks.
  • This spring configuration 12 also provides a better view of the lubricant.
  • the lubricant is arranged between the pierced stone and the counter-pivot stone.
  • the view of the center of the counter-pivot stone is released and defined. This is possible by the shape of the head or heads that tend to delimit an area. With a shape of an arc whose interface with the extension is done by the concave face, the extensions of the spring must be longer and the heads of supports offer a visual delimiting no zone and blocking the view on the lubricant.
  • each extension thus has its center C '.
  • the spring 12 is a spring ring 120.
  • a spring ring 301 comprises internal radial extensions 121 disposed between annular portions 122. These internal radial extensions 121 are constituted by the band forming the ring 120 which is bent inwards of the ring all forming a peripheral ring shape 12 '. These internal radial extensions 121 are, preferably, regularly distributed over the round of the flat ring 120 so that the latter can act homogeneously. These internal radial extensions 121 each comprise the support head 14 according to the invention. It is then understood that the spring ring 120 can be oriented in any way with respect to the support block 1.
  • This support block 1 also comprises a peripheral rim provided with a peripheral protruding portion extending towards the inside of the block support.
  • the peripheral protruding portion may comprise a notch allowing the establishment of the spring ring 120, said peripheral protruding portion serving to retain the spring ring in place.
  • the spring ring may comprise three internal radial extensions.
  • the peripheral protruding portion may comprise three notches allowing the establishment of the spring ring via a bayonet insertion, said extension serving to retain the spring ring in place.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
  • Vibration Dampers (AREA)
EP16186261.0A 2016-08-30 2016-08-30 Stossdämpfer-gleitlager für eine uhr Active EP3291026B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16186261.0A EP3291026B1 (de) 2016-08-30 2016-08-30 Stossdämpfer-gleitlager für eine uhr
CN201721029367.1U CN207133591U (zh) 2016-08-30 2017-08-17 用于钟表件的减震器轴承

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16186261.0A EP3291026B1 (de) 2016-08-30 2016-08-30 Stossdämpfer-gleitlager für eine uhr

Publications (2)

Publication Number Publication Date
EP3291026A1 true EP3291026A1 (de) 2018-03-07
EP3291026B1 EP3291026B1 (de) 2020-01-01

Family

ID=56842737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16186261.0A Active EP3291026B1 (de) 2016-08-30 2016-08-30 Stossdämpfer-gleitlager für eine uhr

Country Status (2)

Country Link
EP (1) EP3291026B1 (de)
CN (1) CN207133591U (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3671368B1 (de) * 2018-12-20 2022-11-23 The Swatch Group Research and Development Ltd Lager, insbesondere zur stossdämpfung, und drehteil eines uhrwerks

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH208022A (fr) * 1938-10-13 1939-12-31 Colomb Henri Palier amortisseur de chocs.
FR927029A (fr) * 1945-05-02 1947-10-17 Dispositif pour la fixation élastique d'un palier, notamment d'un palier pour axe de balancier de montre
CH294058A (fr) * 1949-12-17 1953-10-31 Tech De L Ind Horlogere Centre Palier amortisseur de chocs pour mobiles de pièces d'horlogerie.
CH294057A (fr) * 1950-10-19 1953-10-31 Parechoc Sa Dispositif de montage d'un contre-pivot d'axe d'horlogerie sur son support.
CH325895A (fr) * 1955-06-25 1957-11-30 Seitz & Co Palier pare-chocs
CH335173A (fr) * 1957-01-28 1958-12-31 Schwartzmann Marcel Auguste An Palier amortisseur de chocs pour mobile d'horlogerie
FR1532798A (fr) 1967-07-21 1968-07-12 Palier amortisseur de chocs pour mobile d'horlogerie
JPS5226569U (de) * 1975-08-14 1977-02-24
EP1705537A1 (de) * 2005-03-23 2006-09-27 Rolex S.A. Stoßdämpfende Lagerung für Uhren

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH208022A (fr) * 1938-10-13 1939-12-31 Colomb Henri Palier amortisseur de chocs.
FR927029A (fr) * 1945-05-02 1947-10-17 Dispositif pour la fixation élastique d'un palier, notamment d'un palier pour axe de balancier de montre
CH294058A (fr) * 1949-12-17 1953-10-31 Tech De L Ind Horlogere Centre Palier amortisseur de chocs pour mobiles de pièces d'horlogerie.
CH294057A (fr) * 1950-10-19 1953-10-31 Parechoc Sa Dispositif de montage d'un contre-pivot d'axe d'horlogerie sur son support.
CH325895A (fr) * 1955-06-25 1957-11-30 Seitz & Co Palier pare-chocs
CH335173A (fr) * 1957-01-28 1958-12-31 Schwartzmann Marcel Auguste An Palier amortisseur de chocs pour mobile d'horlogerie
FR1532798A (fr) 1967-07-21 1968-07-12 Palier amortisseur de chocs pour mobile d'horlogerie
JPS5226569U (de) * 1975-08-14 1977-02-24
EP1705537A1 (de) * 2005-03-23 2006-09-27 Rolex S.A. Stoßdämpfende Lagerung für Uhren

Also Published As

Publication number Publication date
CN207133591U (zh) 2018-03-23
EP3291026B1 (de) 2020-01-01

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