EP4123391A1 - Uhrenkomponente zur befestigung auf einer welle und verfahren - Google Patents

Uhrenkomponente zur befestigung auf einer welle und verfahren Download PDF

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Publication number
EP4123391A1
EP4123391A1 EP21187238.7A EP21187238A EP4123391A1 EP 4123391 A1 EP4123391 A1 EP 4123391A1 EP 21187238 A EP21187238 A EP 21187238A EP 4123391 A1 EP4123391 A1 EP 4123391A1
Authority
EP
European Patent Office
Prior art keywords
shaft
component
timepiece
passage
timepiece component
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
EP21187238.7A
Other languages
English (en)
French (fr)
Inventor
Stéphane Berthoud
Julien GATINET
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.)
Dubois and Depraz SA
Original Assignee
Dubois and Depraz SA
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 Dubois and Depraz SA filed Critical Dubois and Depraz SA
Priority to EP21187238.7A priority Critical patent/EP4123391A1/de
Publication of EP4123391A1 publication Critical patent/EP4123391A1/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
    • 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
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears

Definitions

  • the present invention relates to a timepiece component chosen from among a toothed wheel, a display disk (or indicator disk) and a cam, more precisely the fixing of such a timepiece component on a shaft. It also relates to a timepiece assembly comprising such a timepiece component fixed on a shaft, a timepiece device comprising such a timepiece assembly and at least one other timepiece component and a method for assembling such a timepiece component with a shaft.
  • the toothed wheels or the display discs are generally fixed on their shaft by traditional driving, that is to say by a plastic deformation of their opening. Alternatively, they can be fixed on their axis by gluing, riveting or brazing. These types of assemblies have the disadvantage of being irreversible.
  • European patent application EP 1 708 045 describes an alternative method of attaching a clock wheel to an axle using elastic-type driving.
  • the wheel described in this patent application has a circular central hole, the inner surface of which is lined with elastic arms which only undergo elastic deformation when the axle is driven into the hole. This type of structure is not entirely satisfactory because it only makes it possible to obtain low strength.
  • An object of the present invention is to propose a watch component chosen from among a toothed wheel, a display disc and a cam, intended to be fixed on a shaft so as to be integral in rotation and in translation with this shaft. during its operation in a watch, said component overcoming at least in part the aforementioned drawbacks.
  • the present invention relates to a timepiece component chosen from among a toothed wheel, a display disc and a cam comprising a passage intended to receive a shaft.
  • the timepiece component comprises a retaining element and a locking arm capable of moving between a rest position and a locked position in which it cooperates with said retaining element.
  • the locking arm When it moves from its rest position to its locked position, the locking arm is intended to clamp the shaft against the wall of said passage so as to make it integral with said timepiece component and, once in its locked position, to maintain in this state.
  • Such a locking arm makes it possible to obtain a strong clamping force and therefore a good hold while retaining the possibility of separating the timepiece component from the shaft.
  • the locking arm of the component according to the invention is intended to clamp the shaft against the wall of said passage either directly by pressing on the shaft, or indirectly by pressing on the wall of the passage intended to receive the shaft.
  • the passage is cylindrical. It is typically central.
  • the wall of said passage is configured to deform elastically in a plane perpendicular to the axis of the passage, and the locking arm is arranged so that, when it moves from its position of at rest towards its locked position, it constricts said passage and, once in its locked position, it maintains it in a constricted configuration.
  • the locking arm During its passage from its rest position to its locked position, the locking arm typically presses on a part, typically a bulge, of the outer surface of said wall.
  • the locking arm when moving from its rest position to its locked position, the locking arm is intended to press directly on the shaft to clamp it against said wall.
  • the locking arm according to the invention is typically an elastic arm but it can also be a rigid arm articulated, typically by means of a pivot.
  • this arm is arched. It typically extends substantially concentrically to the interior surface of the passage.
  • shaft denotes either a shaft proper or a barrel. In general, this term designates any part or cylindrical or frustoconical part, solid or hollow, intended to pivot in a watch movement.
  • the clamping force exerted on the shaft is low or zero has the advantage of allowing adjustment of the relative position of the shaft with respect to the watch component according to the invention, angularly and/or axially, typically for their indexing, before locking their relative position by means of the locking arm. Having a low clamping force versus zero force before locking the lock arm allows for more precise adjustment. This also makes it possible to avoid the disturbance of the relative position of the shaft with respect to the timepiece component to which it is fixed at the time of locking of the locking arm.
  • the invention also relates to a timepiece assembly comprising such a timepiece component and a shaft passing through said cylindrical passage, said component and said shaft being secured to each other both axially and in rotation.
  • the shaft of the assembly according to the invention is a barrel of a toothed wheel; its timepiece component is typically a display disc.
  • the locking arm is considered in the locked position.
  • a timepiece device comprises such a timepiece assembly and at least one other timepiece component through which said shaft passes, in which the timepiece component of said assembly ensures the axial retention of said at least one other timepiece component on the shaft.
  • This method typically comprises an additional step c′ between steps c and d consisting in adjusting the relative position of the shaft with respect to the component by pivoting and/or sliding around and/or along said axis.
  • the invention also relates to a timepiece such as a wristwatch or a pocket watch comprising such a timepiece assembly.
  • the figures 1a and 1b illustrate a display disc 1 according to a first embodiment of the invention. It typically carries a scale (not shown) corresponding to the tens digits of a date display and is intended to be mounted on a shaft.
  • the display disc 1 comprises a central and cylindrical passage 2 with axis A, intended to receive said shaft.
  • the wall 3 delimiting the cylindrical passage 2 is configured to be able to deform elastically in a plane perpendicular to the axis A while receiving the shaft and to then be able to exert an elastic clamping force on the shaft. This elastic deformation takes place over at least part of the circumference of said wall 3.
  • the display disc 1 further comprises a locking arm 4 and a retaining element 6.
  • the locking arm 4 is capable of moving between a first position called the “rest position”, illustrated in picture 1a , and a second position called “locked position”, illustrated in figure 1b , in which a hook 5 which it carries at its free end cooperates with the retaining element 6.
  • the locking arm 4 When it moves from its rest position to its locked position, the locking arm 4 tightens the cylindrical passage 2 by pressing on the outer surface of its wall 3, in particular on a bulge 8 that it comprises. It tends to reduce the diameter of the cylindrical passage 2.
  • the section of the inner surface of the cylindrical passage 2 is C-shaped, it typically has two ends 3a and 3b intended to approach each other when locking the locking arm 4 to tighten the cylindrical passage 2.
  • the inner wall of the cylindrical passage 2 defines an arc of a circle with an angle ⁇ of approximately 340°.
  • the inner surface of the cylindrical passage 2 can be smooth as shown in the figures or include hollows or bumps.
  • the angle ⁇ over which this arc of a circle extends is typically greater than 270°, preferably greater than 300°, of preferably still greater than 330°.
  • the locking arm 4 maintains the cylindrical passage 2 in a constricted configuration, as illustrated in figure 1b .
  • the locking arm 4 is an elastic arm. Alternatively, it could be rigid and articulated, typically by means of a pivot. This arm 4 is arcuate and extends concentrically to the inner surface of the cylindrical passage 2.
  • the locking arm 4 comprises, close to its free end, a hole 7 intended to receive a tool facilitating the assembly manipulations of the watchmaker.
  • the figures 2a to 3b illustrate part of a date display device 100 comprising a first display disc such as display disc 1, a toothed pinion 9 comprising a barrel 10 and a toothed wheel 11 whose barrel 12 is fixed in rotation of a second display disc 13.
  • the second display disc 13 typically bears a scale (not shown) corresponding to the unit digits of a date display.
  • Barrel 12 comprises a through cylindrical bore through which barrel 10 of toothed pinion 9 passes.
  • Barrel 10 is intended to pivot inside said bore.
  • the locking arm 4 of the first display disc 1 is in the rest position.
  • the assembly of the device 100 is typically done as follows: the second display disc 13 is mounted on the barrel 12 of the toothed wheel 11 and secured to the latter.
  • the barrel 10 is then inserted into the cylindrical bore passing through the toothed wheel 11 then the first display disc 1 is mounted on the barrel 10.
  • its cylindrical passage 2 is aligned with the axis A of the barrel 10, then it is moved along this axis until the barrel 10 passes through the cylindrical passage 2.
  • the wall 3 of the cylindrical passage 2 deforms elastically to allow the barrel 10 to pass. In this position, illustrated in figure 2a and 3a , the display disc 1 and the barrel 10 are fixed relative to each other.
  • the elastic return force exerted by the wall 3 on the barrel 10 is however weak enough for the watchmaker to be able to separate them in order to position them as desired (indexing in particular).
  • the watchmaker typically introduces a tool into the hole 7 in order to lock the locking arm 4 by pulling the hook 5 behind the retaining element 6.
  • the device thus obtained is illustrated in figure 2b and 3b .
  • the first display disc 1 and the pinion 9 form a set of two parts fixed relative to each other axially and in rotation and capable of remaining so when it is used in a watch mechanism.
  • the first display disc 1 here plays the role of axially holding the display disc 13 and the unit wheel 11.
  • the device 100 could comprise a barrel 10 whose diameter to be inserted into the cylindrical passage 2 would be slightly smaller so that the wall 3 would not undergo any elastic deformation during the insertion of the barrel 10 into the cylindrical passage 2. The barrel 10 would then be free in rotation and in translation there until the arm 4 is brought into the locking position.
  • the outer contour of the barrel 10 can advantageously comprise an inclined plane 14 to reinforce the axial retention of the first display disc 1 on the barrel 10.
  • the watchmaker who wishes to separate the display disc 1 from the barrel 10 would only have to unlock the locking arm 4 by separating its hook 5 from the retaining element 6 then exert a force along the axis A on the disc 1 or on the pinion 9 (or its barrel 10) to remove the barrel 10 from the cylindrical passage 2.
  • the cylindrical passage 2 would then resume a configuration identical to that preceding its assembly with the pinion 9 It is said that the fixing of the disc 1 on the barrel 10 is reversible.
  • FIGS. 4a and 4b illustrate part of a display device 200 comprising a first display disc 201 according to a second embodiment of the invention mounted on the barrel 210 of a pinion.
  • display disc 201 comprises a central passage intended to receive barrel 210. to the organs or parts of organs bearing the references 1, 3, 4, 5, 6, 7, 10 of the device according to the first embodiment of the invention.
  • Display disc 201 differs from display disc 1 according to the first embodiment of the invention in that its locking arm 204 is intended to act directly on shaft 210 during locking.
  • the inner surface of the central passage comprises two arcs of a circle, one of which is carried by the locking arm 204.
  • the locking arm 204 in fact comprises a part 204a intended to bear against the shaft 210 during its passage from its rest position to its locked position.
  • a display disc (not shown) according to a third embodiment of the invention differs from the disc according to the second embodiment of the invention in that the inner surface of its central passage is delimited by at least a first wall, the rigid inner contour of which is fixed relative to the body of the disc and intended to be in contact with the shaft when the locking arm is in the locked position and at least one second part of the wall, similar to the single wall according to the first embodiment of the invention, capable of deforming elastically and intended to be tightened against the shaft to fix it axially and in rotation relative to the disc when locking the locking arm, and to be maintained in this tightened configuration by the locking arm when the latter is in the locked position.
  • the passage intended to receive the shaft typically forms part of a recess in which the locking arm is also located.
  • the timepiece component according to the present invention has many advantages over those of the prior art. It has a structure allowing it to be fixed easily and securely on a tree. It is designed so that the adjustment of its relative position in relation to the shaft is as simple and as precise as possible. It also allows reversible attachment.
  • timepiece component according to the invention is in no way limited to the embodiments presented above and illustrated in the figures. It is for example very well conceivable to produce a timepiece component according to the invention other than a display disc, for example a toothed wheel or a cam. In the case where the timepiece component according to the invention is a display disc or a toothed wheel, its passage intended to receive the shaft is preferably centred.
  • the shape of the members in particular the shape of the wall 3 bordering the cylindrical passage 2 or that of the locking arm 4 can vary ad infinitum as long as their functions are ensured.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
EP21187238.7A 2021-07-22 2021-07-22 Uhrenkomponente zur befestigung auf einer welle und verfahren Pending EP4123391A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21187238.7A EP4123391A1 (de) 2021-07-22 2021-07-22 Uhrenkomponente zur befestigung auf einer welle und verfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21187238.7A EP4123391A1 (de) 2021-07-22 2021-07-22 Uhrenkomponente zur befestigung auf einer welle und verfahren

Publications (1)

Publication Number Publication Date
EP4123391A1 true EP4123391A1 (de) 2023-01-25

Family

ID=77042722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21187238.7A Pending EP4123391A1 (de) 2021-07-22 2021-07-22 Uhrenkomponente zur befestigung auf einer welle und verfahren

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EP (1) EP4123391A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1708045A2 (de) 2005-03-22 2006-10-04 Patek Philippe S.A. Befestigung eines Uhrrads an einer Spindel
US20120186054A1 (en) * 2011-01-26 2012-07-26 Nivarox-Far S.A. Pawl lock assembly system
EP2743782A1 (de) * 2012-12-11 2014-06-18 Nivarox-FAR S.A. Vorrichtung zum Zusammenbau von elastischen Armen durch Verformung
EP2977829A1 (de) * 2014-07-24 2016-01-27 ETA SA Manufacture Horlogère Suisse Anordnung mit beweglichem Bremselement einer Uhr

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1708045A2 (de) 2005-03-22 2006-10-04 Patek Philippe S.A. Befestigung eines Uhrrads an einer Spindel
US20120186054A1 (en) * 2011-01-26 2012-07-26 Nivarox-Far S.A. Pawl lock assembly system
EP2743782A1 (de) * 2012-12-11 2014-06-18 Nivarox-FAR S.A. Vorrichtung zum Zusammenbau von elastischen Armen durch Verformung
EP2977829A1 (de) * 2014-07-24 2016-01-27 ETA SA Manufacture Horlogère Suisse Anordnung mit beweglichem Bremselement einer Uhr

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