EP4163733A1 - Triebfeder einer uhr - Google Patents

Triebfeder einer uhr Download PDF

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Publication number
EP4163733A1
EP4163733A1 EP21200901.3A EP21200901A EP4163733A1 EP 4163733 A1 EP4163733 A1 EP 4163733A1 EP 21200901 A EP21200901 A EP 21200901A EP 4163733 A1 EP4163733 A1 EP 4163733A1
Authority
EP
European Patent Office
Prior art keywords
shaft
board
friction
arms
mounting part
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.)
Pending
Application number
EP21200901.3A
Other languages
English (en)
French (fr)
Inventor
Christophe Cattin
Ivan Villar
Laurent Kaelin
Anne PHILIPPS
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 EP21200901.3A priority Critical patent/EP4163733A1/de
Publication of EP4163733A1 publication Critical patent/EP4163733A1/de
Pending legal-status Critical Current

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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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • G04B13/023—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft allowing rotational slipping when a threshold torque is exceeded

Definitions

  • the present invention relates to a friction-operated clockwork mobile, which can be used in a timepiece.
  • Many watch movements include at least one friction mobile, in particular to allow corrections to the time display or other functions.
  • a mechanical movement fitted with a large medium wheel, generally includes friction at the timer train. The friction enables the road to be turned, independently of the going train, when setting the time.
  • a friction wheel set comprises a shaft, provided with a pivot, and a board provided with peripheral toothing and defining a wheel.
  • the board is attached to the shaft in an essentially coaxial way, by a friction assembly which prevents the relative rotation of the two parts with respect to each other, except when the torque force exceeds a predefined threshold.
  • the friction connection is achieved by a plurality of arms of the board, which form a gripper arranged to grip a side surface of the shaft. This lateral surface is in the vicinity of an axial abutment surface of the shaft, which maintains the board in its functional axial position.
  • the assembly of this type of mobile is a delicate operation which requires a spacing of the arms of the board to allow the insertion of one end of the shaft.
  • the drive wheel is provided with two arms arranged on either side of the axis of rotation of the wheel and having a certain elasticity.
  • specific tooling is available for spreading the two arms apart, followed by movement of the apart arms along the shaft towards their final axial position.
  • the object of the invention is to provide a clockwork wheel set, with a wheel frictionally mounted on a shaft provided with a pinion, which does not suffer from the drawbacks described above and which is arranged in such a way that the shaft and the wheel, also called board, can be assembled without using specific tools.
  • the invention relates to a clockwork wheel set formed of a shaft, which extends in an axial direction of the clockwork wheel set, and of a plate forming a wheel which is mounted frictionally on the shaft.
  • the shaft comprising an axial abutment surface for the board/wheel and being arranged to be able to hold this board/wheel, once mounted, substantially in a functional axial position where it is against the axial abutment surface
  • the board/wheel comprising at least one first arm and at least one second arm together forming a gripper arranged to be able to grip, by an elastic deformation of at least one of these arms in a direction of opening of the gripper, a surface of revolution of friction that the said shaft has in the vicinity of the axial thrust surface.
  • the shaft comprises a cylindrical mounting part which is, in said axial direction, beyond the surface of friction revolution relative to the axial abutment surface, the cylindrical mounting part having a cross-section of oblong shape having a major axis, along a longitudinal direction of this cross-section, and a minor axis perpendicular to the major axis and of lesser dimension than this major axis and than the minimum diameter of said surface of friction revolution .
  • the shaft is configured to allow assembly of the watch wheel by inserting the cylindrical mounting part, without significant deformation of the clamp, into a central zone between the arms of the clamp by orienting this cylindrical mounting part so that the minor axis of its cross-section is parallel to the direction of opening of the clamp, then by a certain opening of the clamp generated by a rotation of substantially ninety degrees (90°) of the shaft with respect to the board/wheel or vice versa, and finally by a terminal axial displacement of this board/wheel towards its functional axial position in which the gripper exhibits an elastic deformation providing functional friction for the clockwork wheel set.
  • said surface of friction revolution defines the bottom of a circular housing arranged along the shaft for receiving the board/wheel in said functional axial position and holding it in this functional axial position.
  • THE figures 1a and 1b represent an example of a typical clockwork mobile according to the state of the art, which comprises a shaft 1 and a plate 2 defining a wheel (hereinafter a plate), in particular a driving wheel.
  • the shaft 1 comprises a pivot 3, in the form of an elongated tube, and a pinion 4, the upper radial surface 5 of which forms an axial abutment surface against which the board 2 is held.
  • the board 2 comprises two arms 6a and 6b forming a clamp which grips a surface of revolution of friction 7a disposed at the bottom of a lateral housing 7 of the shaft 1.
  • the friction between the inner surfaces of the arms 6a and 6b of the board 2 and the surface of revolution of friction 7a of the shaft 1 defines the mobility in rotation, and in particular a sliding threshold of the components 1 and 2 of the movable relative to each other under the influence of an external force couple.
  • the shaft 1 comprises an end part 8, with a diameter slightly greater than the maximum diameter of the bottom of the housing 7, located beyond this housing, observed in the axial direction of the shaft 1 relative to the axial abutment surface 5.
  • An assembly tool (not shown) is necessary to separate the arms 6a and 6b in elastic deformation, so that the end part 8 can be inserted in a central zone of the board between the two arms of the clamp. Then the tool is removed and the board 2 is pushed towards its final position shown in section at the figure 1b , the arms 6a and 6b then squeezing the surface of revolution of friction 7a at the bottom of the housing 7.
  • the invention solves the problem described above by a clockwork wheel set provided with a shaft 1A which comprises a cylindrical mounting part 10, which takes the place of the end part indicated in the preceding figures, in particular of the end part 8A.
  • a shaft 1A of a clockwork mobile according to one embodiment of the invention is shown in picture 3 .
  • the shaft 1A according to the invention comprises a pivot 3 (cylindrical tube) and a pinion 4, as well as a housing 7 comprising at its bottom the surface of revolution of friction 7a, which is provided to receive in frictional contact the arms 6a and 6b of the board 2, the latter possibly having the same shape as that shown in figures 1a and 1b .
  • This part 10 has the shape of a cylinder with an oblong cross-section. More specifically, the cross section (perpendicular to the axial direction) has two perpendicular axes of symmetry: a major axis A along the longitudinal direction of this oblong cross section (also called major axis for an ellipse in particular) and a minor axis B (also named minor axis for an ellipse in particular).
  • the dimension of the major axis A corresponds to the diameter of the upper edge 11 of the housing 7.
  • the minor axis B has a smaller dimension than the major axis and than the minimum diameter of the surface of revolution of friction 7a (this surface possibly being slightly tapered).
  • the cylindrical mounting part 10 comprises two angular sections 12a and 12b, corresponding to sections of a circular cylindrical having the same diameter as the upper edge 11 of the housing 7, and two angular sections 13a and 13b in withdrawal of the upper edge 11, that is to say inside said circular cylinder.
  • the angular sections 13a to 13b can have various profiles, in particular a profile defining an arc of a circle at least in the middle zone of these angular sections.
  • Other shapes of the cylindrical mounting part 10 are possible, such as for example a shape with a purely elliptical cross section having the axes A and B as central axes (major axis and minor axis) of this cross section.
  • the shaft 1A is configured to allow the assembly of the clockwork wheel set by inserting the cylindrical part assembly 10, without significant deformation of the clamp formed by the two arms 6a, 6b, in a central zone between these two arms, by orienting this cylindrical assembly part so that the minor axis B of its cross section is parallel to the direction of opening of the gripper (direction orthogonal to the general direction of the two arms; in other words: direction orthogonal to the axis of symmetry of these two arms defining a central axis of the gripper).
  • the cylindrical part 10 is arranged to allow a certain opening of the clamp, and therefore to obtain an elastic deformation of the two arms forming the clamp, by a rotation of substantially ninety degrees (90°) of the shaft 1A with respect to the board 2.
  • the shaft 1A is arranged to allow, while maintaining the orientation resulting from said rotation of 90°, a terminal axial displacement of the board 2 towards its functional axial position in which the gripper has an elastic deformation ensuring a functional friction for the clockwork mobile.
  • the clockwork mobile assembly method is illustrated in figures 4a to 4c . It is first provided to orient the shaft 1A relative to the board 2 so that the minor axis B of the cross section of the cylindrical mounting part 10 is parallel to the opening direction of the clamp and, while maintaining substantially this orientation of the shaft, to insert the cylindrical mounting part axially in the central zone between the arms forming the clamp. Next, shaft 1A is turned through an angle of approximately 90° relative to board 2 (see figure 4b ), resulting in an elastic opening of the gripper. Indeed, the cross section of the cylindrical part 10, in particular the dimension of the major axis A, is configured so that this rotation spreads the arms 6a and 6b elastically.
  • the cylindrical mounting part 10 is extended by two ramps 14 (visible in picture 3 ) which are at the foot of each of the rearward sections 13a and 13b and form a short intermediate zone between the cylindrical part 10 and the upper edge 11 of the housing 7, these two ramps being able to serve to stop the insertion of the cylindrical part 10 into the central zone of the gripper before the rotation serving to separate the gripper is carried out.
  • the shaft 1A can then be turned, in particular by 90°, with respect to the board 2 by applying to this shaft or to the board a couple of forces greater than a threshold at from which one obtains a sliding on the surface of revolution of friction.
  • the invention applies in the first instance to mobiles whose shaft is provided with an end part of considerable height beyond the surface of revolution of friction relative to the axial abutment surface 5. Nevertheless, the invention is not limited to shafts of this type and it is also applicable when the terminal part is of reduced height.
  • the surface of friction revolution is located at the bottom of a housing 7 and is therefore moved back with respect to a circle whose diameter is the major axis A of the cross section of the part 10.
  • This represents a preferred form that allows to finish assembly by snapping the board 2 so that it remains in its functional axial position.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gears, Cams (AREA)
EP21200901.3A 2021-10-05 2021-10-05 Triebfeder einer uhr Pending EP4163733A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21200901.3A EP4163733A1 (de) 2021-10-05 2021-10-05 Triebfeder einer uhr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21200901.3A EP4163733A1 (de) 2021-10-05 2021-10-05 Triebfeder einer uhr

Publications (1)

Publication Number Publication Date
EP4163733A1 true EP4163733A1 (de) 2023-04-12

Family

ID=78078100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21200901.3A Pending EP4163733A1 (de) 2021-10-05 2021-10-05 Triebfeder einer uhr

Country Status (1)

Country Link
EP (1) EP4163733A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060187768A1 (en) * 2005-02-22 2006-08-24 Takuya Murazumi Gear structure and timepiece having the same
US20180046142A1 (en) * 2015-03-11 2018-02-15 Citizen Holdings Co., Ltd. Power transmission body of timepiece and method of manufacturing power transmission body of timepiece
EP3432081B1 (de) * 2017-07-18 2020-03-18 Richemont International S.A. Uhreneinheit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060187768A1 (en) * 2005-02-22 2006-08-24 Takuya Murazumi Gear structure and timepiece having the same
US20180046142A1 (en) * 2015-03-11 2018-02-15 Citizen Holdings Co., Ltd. Power transmission body of timepiece and method of manufacturing power transmission body of timepiece
EP3432081B1 (de) * 2017-07-18 2020-03-18 Richemont International S.A. Uhreneinheit

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