EP3974913A1 - Federgehäuse für uhr - Google Patents

Federgehäuse für uhr Download PDF

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Publication number
EP3974913A1
EP3974913A1 EP21209059.1A EP21209059A EP3974913A1 EP 3974913 A1 EP3974913 A1 EP 3974913A1 EP 21209059 A EP21209059 A EP 21209059A EP 3974913 A1 EP3974913 A1 EP 3974913A1
Authority
EP
European Patent Office
Prior art keywords
barrel
drum
cover
arbor
wall
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
EP21209059.1A
Other languages
English (en)
French (fr)
Inventor
Florent Millet
Julien Saglini
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.)
Rolex SA
Original Assignee
Rolex 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 Rolex SA filed Critical Rolex SA
Priority to EP21209059.1A priority Critical patent/EP3974913A1/de
Publication of EP3974913A1 publication Critical patent/EP3974913A1/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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/16—Barrels; Arbors; Barrel axles
    • 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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring

Definitions

  • the invention relates to a barrel for a timepiece movement, a timepiece movement and a timepiece incorporating such a barrel, in particular a wristwatch. It also relates to a method of manufacturing a barrel for a clock movement.
  • the figure 1 illustrates a barrel according to the traditional architecture of the state of the art. It comprises a barrel arbor 1 around which is arranged rotatably an assembly comprising a drum 2 and a cover 3 delimiting a housing 4 in which is arranged the barrel spring 15, partially shown.
  • This spring transmits the energy necessary for the operation of a watch movement and therefore determines its power reserve.
  • the shaft At its two ends, the shaft comprises end portions 5 and bearing surfaces 6, which cooperate with the components of the two blanks 10 of the watch movement, such as for example a bridge and a plate, between which is mounted the barrel. These end portions 5 and these bearing surfaces 6 define the radial and axial guidance of the barrel in its movement, and minimize its radial and axial play.
  • Drum 2 and cover 3 form flat discs arranged around barrel arbor 1, extending perpendicular to this arbor. They include in their central part annular projections 7 which form a first contact surface 8 on bearing surfaces of the barrel arbor 1, perpendicular to the axis A of the barrel arbor. These annular projections also form a second contact surface 9 with the barrel arbor, parallel to the axis of this arbor, arranged on the circumference substantially cylinder of the barrel arbor 1.
  • the document EP2570861 describes a barrel according to an alternative architecture, in which the movement of the barrel in a direction parallel to the axis of the barrel arbor is obtained at least partially by direct cooperation of the drum and the cover with a bridge and a plate of the watch movement.
  • Such an approach makes it possible to increase the height of the mainspring compared to the traditional architecture described previously.
  • this approach leads to significant axial play in the barrel and increases the risk of wear. It is therefore not acceptable.
  • the object of the invention is to maximize the power reserve of a watch movement while presenting a high-performance and reliable barrel.
  • the invention is based on a barrel for a timepiece movement, comprising a barrel arbor around which is arranged in a rotatable manner an assembly comprising a drum and a cover defining a housing for receiving a barrel spring, the drum and the cover each having a wall extending from a peripheral end of the barrel to a central end of the barrel at the level of the barrel arbor, characterized in that at least a part of at least one of the said walls has a variable thickness which increases continuously as it moves away from the peripheral end of the barrel.
  • the wall part of the drum or of the cover may have an inner surface substantially perpendicular to the axis of the barrel arbor and an outer surface inclined with respect to the axis of the barrel arbor so as to move away from the inner surface and to increase the thickness of the wall by getting closer to the barrel arbor.
  • the wall part of the drum or of the lid may have a variable thickness which extends from its peripheral end to its central end, and/or over a distance of at least half the radius of the drum, or even over a distance at least two-thirds of the radius of the drum.
  • the wall portion of the drum or of the cover may comprise an outer wall which has an angle of inclination greater than or equal to 0.5 degrees with respect to a plane perpendicular to the axis of the barrel arbor, or of angle between 0.5 and 5 degrees inclusive, or between 0.5 and 2 degrees inclusive, or between 0.5 and 1.5 degrees inclusive.
  • the ratio between the maximum thickness e1 of the wall part and its minimum thickness e2 may be greater than or equal to 1.4, and/or the thickness maximum thickness e1 of the wall part may be less than or equal to 0.18 mm, or even 0.15 mm, and/or the minimum thickness e2 may be less than or equal to 0.13 mm, or even 0.1 mm .
  • the drum and/or the cover may comprise a projection at its central end, presenting at least one contact surface with the barrel arbor for guiding it in rotation around the barrel arbor.
  • the ratio between the height hs of the protrusion and the minimum thickness e2 of the wall part can be greater than or equal to 3.
  • the diameter of the drum can be less than or equal to 20 mm.
  • the drum and/or the cover does not include any radial or axial guide surface in contact with the watch movement outside the barrel.
  • the drum and/or the cover can be made of a material suitable for manufacture by removal of material, such as a copper-based alloy such as brass.
  • the invention also relates to a timepiece movement characterized in that it comprises a barrel as described previously.
  • the clockwork movement may comprise a diameter less than or equal to 40 mm.
  • the invention also relates to a timepiece such as a watch, in particular a wristwatch, characterized in that it comprises a barrel as described above or a timepiece movement as described above.
  • the timepiece may comprise two blanks, such as a bridge and a plate, between which is mounted the barrel arbor, which comprises at its ends radial and axial guide surfaces of the barrel cooperating with the blanks, and characterized in that the barrel shaft comprises axial and radial guide surfaces for the rotation of the drum and of the barrel cover.
  • the invention also relates to a method of manufacturing a barrel for a timepiece movement, comprising a step of manufacturing by removing material from a drum and/or a barrel cover intended to delimit a housing to receive a barrel spring, the drum and the cover each having a wall extending from a peripheral end of the barrel to a central end of the barrel at the level of the barrel arbor, characterized in that it generates a variable thickness which increases continuously as it moves away from the peripheral end of the barrel of at least a part of at least one of said walls.
  • the picture 2 illustrates a barrel according to one embodiment of the invention. It comprises a barrel arbor 20 around which is arranged in a rotatable manner a rotating assembly comprising a drum 30 and a cover 40 delimiting a housing 50 in which the barrel spring 51 is arranged.
  • the barrel arbor 20 comprises an axis A of revolution and is intended to be mounted between two blanks of a watch movement, not shown. Each blank is for example a bridge or a plate.
  • this barrel arbor guides the rotational movement of the rotating assembly and limits the axial and radial movement of the barrel relative to the watch movement, by its connections at the level of its two ends which are provided to cooperate with the blanks.
  • Axis A is therefore also the axis of rotation of the barrel.
  • the drum 30 and the cover 40 comprise a first end which we will call peripheral end 34, 44 and a second end at the level of the barrel shaft 20 which forms their axis of rotation, which we will call central end. At or substantially at their peripheral end, they can form a bend to meet and close the housing 50. Between these two ends, the walls 31, 41 of the drum 30 and of the cover 40 preferably have similar shapes, symmetrical by relative to a median plane perpendicular to the axis of the barrel arbor.
  • the inner surface 32 is substantially perpendicular to the axis of the barrel arbor, forms a flat disc in a plane substantially perpendicular to the axis of the barrel arbor, which makes it possible to delimit a housing 50 of substantially rectangular section, and which forms a portion of a cylinder around the barrel arbor.
  • the outer surface 33 is slightly inclined with respect to the direction perpendicular to the axis of the barrel shaft, so that the thickness of the wall 31 of the drum, measured between the inner surface 32 and the outer surface 33, decreases continuously in the direction from the center to the periphery.
  • the wall 31 of the drum 30 thickens to form a projection 35 in the form of a cylinder portion.
  • the central surface 36 of this projection substantially parallel to the axis of the barrel arbor 20, comes into contact against this arbor, over the entire circumference of the arbor, and thus guides the rotation around the arbor by minimizing radial movement.
  • the inner surface 37 of the projection 35 substantially perpendicular to the axis of the barrel arbor 20, bears against a corresponding surface provided by a central portion of larger diameter 21 of the barrel arbor. Thus, this surface minimizes the axial movement of the rotating assembly.
  • this projection 35 arranged in the central end of the drum 30, allows the axial and radial guidance with less play of the rotating assembly.
  • the projection has a height hs, measured between its inner surface 37 and the outer surface 38 of the drum 30 at the level of the projection 35.
  • This height hs is at least twice as great as the widest thickness of the wall of the drum, outside the projection 35, even at least three times greater than its minimum thickness.
  • this particular solution therefore comprises a drum 30 and a cover 40 which do not participate in the axial retention of the barrel vis-à-vis the blanks of the watch movement between which the barrel is mounted.
  • the drum and the cover have no contact or guide surface in contact with the blanks, in particular a plate or a bridge.
  • the barrel arbor performs this function alone.
  • the wall 31 has a greatly reduced thickness, minimized to provide the largest possible housing 50 arranged in the limited non-extendable volume imposed by the watch movement, in particular its two blanks between which the barrel is mounted. , to naturally use the largest possible barrel spring, inducing the largest possible power reserve.
  • the wall 31 comprises a minimum thickness e2 at the level of its peripheral end 34.
  • the outer surface 33 of this wall is inclined and moves away continuously from the inner surface 32, up to the level of its border with the projection 35 of the drum 30, to continuously increase the thickness of the wall 31 up to a maximum thickness e1 at its central end at the border with the projection 35.
  • the profile of the outer surface 33 is linear according to a view axial section of the barrel such as that illustrated on the picture 2 .
  • This wall part of the drum 30, which has a thickness which varies continuously, makes it possible to use a thinner wall than the usual wall of a cylinder according to the traditional state of the art, while being sufficiently rigid to guarantee good assembly of the cover and the drum, and allowing its precise and repeatable manufacture by a material removal process of the bar turning type.
  • the drum and/or the lid are advantageously made of a material suitable for manufacture by removal of material, such as a copper-based alloy such as brass.
  • the inclination of the outer surface 33 of the wall 31 of the drum 30 is of the order of 0.5 degrees. More generally, this inclination can be between 0.5 and 5 degrees inclusive, or even between 0.5 and 2 degrees inclusive, more preferably between 0.5 and 1.5 degrees inclusive.
  • the section of the wall 31 thus appears as a section of a truncated half-cone whose axis of revolution is perpendicular to the axis of rotation of the barrel and passes through the inner surface of the wall 31 of the drum.
  • This geometry of the wall of the drum is particularly suitable for a watch, and any watch movement with a diameter less than or equal to 40 mm, or even less than or equal to 35 mm, or even less than or equal to 30 mm, or inscribed in such a circle. It is therefore suitable for example for a drum with a diameter less than or equal to 20 mm.
  • an embodiment may be based on a drum whose diameter is of the order of 12 mm, whose minimum thickness e2 of the wall is 0.1 mm and the maximum thickness e1 outside the projection is 0.15mm.
  • the projection may have a height hs of 0.45 mm.
  • this minimum thickness e2 could be less than or equal to 0.1 mm, for example be 0.09 or 0.08 mm.
  • Such a geometry makes it possible to define a housing 50 with a height Hi greater than or equal to 1.6 mm. More generally, the maximum thickness e1 of the variable-thickness wall part is less than or equal to 0.18 mm, or even 0.15 mm, and the minimum thickness e2 of the variable-thickness wall part is lower or equal to 0.13 mm, or even 0.1 mm.
  • the wall 31 of the drum can have other geometries without departing from the concept of the invention.
  • the part with a surface inclined, of variable thickness extends from the peripheral end of the drum and may not extend to the central end (to the immediate border with the protrusion). It can in fact extend over only part of the radius r of the drum. It can then be supplemented by additional walls of constant thickness. Advantageously, it extends over at least half, or even two thirds, of the radius r of the drum.
  • this wall part of variable thickness can be obtained by a shape other than a linearly inclined planar outer surface, this surface can for example be curved. In all cases, this surface part is continuous. It advantageously has a minimum thickness e2 towards the peripheral end and a maximum thickness e1 towards the central end.
  • the drum wall advantageously has a part of variable thickness, decreasing from a maximum thickness e1 to a minimum thickness e2, with a ratio e1/e2 greater than or equal to 1.4.
  • the wall advantageously has a projection of height hs at its central end, with a ratio hs/e2 between this height and the aforementioned minimum thickness greater than or equal to 3.
  • the cover 40 advantageously has a shape identical and symmetrical to that of the drum 30.
  • everything that has been detailed above about the drum can be applied to the cover. Only the bends of the two components, at their peripheral ends, can differ: they advantageously form respective walls 39, 49, substantially parallel to the axis of the barrel arbor, which cooperate by any means, to close the housing 50.
  • the cover 40 also has a projection 45 at its central end, with two surfaces 46, 47 in contact with corresponding surfaces of the shaft of the barrel 20 to ensure its axial and radial retention, with a minimum of movement, as for the drum.
  • its wall 41 apart from the projection, also has an inclined outer surface 43, the profile of which is preferably linear along an axial section of the barrel, which makes it possible to continuously reduce its thickness from the maximum thickness e1 at the level from the border with the projection 45 towards a minimum thickness e2 at the peripheral end 44 of this upper surface.
  • the inner surface 44 of the wall 41 remains flat and perpendicular to the axis of the barrel arbor.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Closures For Containers (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
EP21209059.1A 2014-06-30 2014-06-30 Federgehäuse für uhr Pending EP3974913A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21209059.1A EP3974913A1 (de) 2014-06-30 2014-06-30 Federgehäuse für uhr

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14174955.6A EP2963504A1 (de) 2014-06-30 2014-06-30 Federgehäuse für Uhr
EP21209059.1A EP3974913A1 (de) 2014-06-30 2014-06-30 Federgehäuse für uhr

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP14174955.6A Division EP2963504A1 (de) 2014-06-30 2014-06-30 Federgehäuse für Uhr

Publications (1)

Publication Number Publication Date
EP3974913A1 true EP3974913A1 (de) 2022-03-30

Family

ID=51014209

Family Applications (2)

Application Number Title Priority Date Filing Date
EP21209059.1A Pending EP3974913A1 (de) 2014-06-30 2014-06-30 Federgehäuse für uhr
EP14174955.6A Pending EP2963504A1 (de) 2014-06-30 2014-06-30 Federgehäuse für Uhr

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP14174955.6A Pending EP2963504A1 (de) 2014-06-30 2014-06-30 Federgehäuse für Uhr

Country Status (4)

Country Link
US (1) US9285772B2 (de)
EP (2) EP3974913A1 (de)
JP (1) JP6537371B2 (de)
CN (1) CN105204314B (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1371491A (fr) * 1963-09-21 1964-09-04 Perfectionnements aux mouvements d'horlogerie en vue d'une lubrification intégrale sans démontage
GB1044852A (en) * 1965-05-10 1966-10-05 Glashutter Uhrenbetr E Veb Spring barrel arrangements for watches
EP2437125A1 (de) * 2010-10-01 2012-04-04 Rolex S.A. Uhr
EP2570861A1 (de) 2011-09-15 2013-03-20 ETA SA Manufacture Horlogère Suisse Uhren-Federgehäuse mit reduziertem Durchmesser des Bundes
EP2570862A1 (de) * 2011-09-15 2013-03-20 ETA SA Manufacture Horlogère Suisse Uhren-Federgehäusebaugruppe mit reduziertem Bunddurchmesser

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH566044A (de) * 1972-12-18 1975-08-29
US6863435B2 (en) * 1997-08-11 2005-03-08 Seiko Epson Corporation Spring, mainspring, hairspring, and driving mechanism and timepiece based thereon
CH702035B1 (fr) * 2006-10-20 2011-04-29 Eterna Sa Fabrique D Horlogerie Pièce d'horlogerie.
EP2060957A1 (de) * 2007-11-16 2009-05-20 ETA SA Manufacture Horlogère Suisse Motorelement mit federn für uhrwerk
CH706654A2 (fr) * 2012-06-28 2013-12-31 Nivarox Sa Ressort-moteur pour une pièce d'horlogerie.
EP2746866B1 (de) * 2012-12-18 2016-05-18 ETA SA Manufacture Horlogère Suisse Federgehäuse einer Uhr
EP2746868B1 (de) * 2012-12-18 2016-04-27 ETA SA Manufacture Horlogère Suisse Federgehäuse einer Uhr

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1371491A (fr) * 1963-09-21 1964-09-04 Perfectionnements aux mouvements d'horlogerie en vue d'une lubrification intégrale sans démontage
GB1044852A (en) * 1965-05-10 1966-10-05 Glashutter Uhrenbetr E Veb Spring barrel arrangements for watches
EP2437125A1 (de) * 2010-10-01 2012-04-04 Rolex S.A. Uhr
EP2570861A1 (de) 2011-09-15 2013-03-20 ETA SA Manufacture Horlogère Suisse Uhren-Federgehäuse mit reduziertem Durchmesser des Bundes
EP2570862A1 (de) * 2011-09-15 2013-03-20 ETA SA Manufacture Horlogère Suisse Uhren-Federgehäusebaugruppe mit reduziertem Bunddurchmesser

Also Published As

Publication number Publication date
US20150378308A1 (en) 2015-12-31
US9285772B2 (en) 2016-03-15
JP6537371B2 (ja) 2019-07-03
CN105204314A (zh) 2015-12-30
CN105204314B (zh) 2020-02-07
JP2016014664A (ja) 2016-01-28
EP2963504A1 (de) 2016-01-06

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