EP3320402A1 - Arbre de barillet d'horlogerie - Google Patents
Arbre de barillet d'horlogerieInfo
- Publication number
- EP3320402A1 EP3320402A1 EP16720862.8A EP16720862A EP3320402A1 EP 3320402 A1 EP3320402 A1 EP 3320402A1 EP 16720862 A EP16720862 A EP 16720862A EP 3320402 A1 EP3320402 A1 EP 3320402A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hook
- mainspring
- end surface
- radius
- barrel shaft
- 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
Links
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
- G04B1/18—Constructions for connecting the ends of the mainsprings with the barrel or the arbor
-
- 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
Definitions
- the present invention relates to a watch drum shaft.
- the barrel is the motor unit that provides the energy needed to move the various components.
- the barrel comprises a drum, a lid closing the drum, a barrel shaft about which the barrel and the lid rotate freely, and a spiral motor spring housed in the drum.
- the outer turn of the motor spring is held by the drum wall.
- the barrel shaft includes a portion called "bung" which carries a hook to which is attached the inner coil of the mainspring.
- the barrel shaft is integral in rotation with a ratchet and, by means of this ratchet, can be rotated by a winding stem (manual winding) or an oscillating weight (automatic winding) of the movement to arm the barrel. motor spring and thus accumulate energy.
- the dimensioning of the barrel shaft allows it to withstand the stresses that it undergoes the motor spring during the arming of the latter.
- such dimensioning limits the volume available inside the drum to accommodate the mainspring. Decreasing the diameter of the barrel shaft would increase the volume of the mainspring, thus the running time of the movement.
- a simple homothetic reduction of the barrel shaft is not suitable, the mechanical strength of the barrel shaft is then no longer sufficient. This lack of mechanical strength is all the more problematic that, for the same torque of the motor spring, a decrease in the diameter of the barrel shaft causes an increase in the force applied to the hook.
- the present invention aims to facilitate a reduction in the diameter of the barrel shaft and proposes for this purpose a watch barrel shaft comprising a plug including itself a bearing surface for an inner coil of a mainspring, bearing surface from which protrudes a hook intended to be engaged in an eyelet of said inner coil, the hook being located, in the axial direction of the barrel shaft, between a first portion and a second portion of the bearing surface and comprising an end surface serving as support to the wall of the eyelet during the winding of the mainspring, the bung comprising, upstream of the hook in the winding direction of the mainspring, a recess for receiving the inner end of the mainspring, characterized in that that the wall of the recess comprises an arcuate recess which abuts the said end surface or an extension of the said end surface without forming an edge with the said end surface, respectively with the said extension, in order to reduce the stresses undergone by the hook when winding the mainspring.
- FIG. 1 is a perspective view of a barrel shaft according to a particular embodiment of the invention.
- FIG. 2 is a plan view from above of the barrel shaft according to said particular embodiment, which is attached to the inner coil of a motor spring (shown partially);
- FIG. 3 is a perspective view of a barrel shaft according to another embodiment of the invention.
- a barrel shaft 1 according to a particular embodiment of the invention comprises two pivots 2, 3 for pivoting in bearings of a clockwork movement about an axis A, a portion of square section 4 on which can be mounted a ratchet, two cylindrical portions 5, 6 for the pivoting, respectively, of a drum and a barrel cover, and a bung 7.
- the bung 7 carries a hook 8 for fixing the inner coil 9 of a spiral motor spring housed in the drum.
- the winding direction of the mainspring is represented in FIG. 2 by the arrow S. More particularly, the bung 7 comprises a bearing surface 10 for the mainspring, on which the hook 8 is located.
- This bearing surface 10 extends, in the winding direction S of the driving spring, of a first bead 1 1 to a second edge 12.
- the bung 7 also comprises, upstream of the hook 8, a clearance 13 for receiving the inner end 14 of the motor spring, clearance whose wall 15 joins the first and second edges 1 1, 12.
- the hook 8 is intended to be engaged in an eyelet 16 of the inner coil 9 of the motor spring and is located, in the direction of the axis A, between two parts 10a, 10b of the bearing surface 10 for him. allow to be surrounded all around the wall of the eyelet 16.
- the hook 8 comprises two opposite end surfaces 17, 18. In the winding direction S, the end surface 18 is located upstream of the end surface 17 and at the level of the first edge 11. This end surface 18, preferably flat, serves to support the wall of the eyelet 16 when the mainspring is armed.
- the bearing surface 10 is composed of a first portion 19 extending from the first edge 11 and whose radius increases in the winding direction S, and a second portion 20 extending from the first portion 19 to the second edge 12 and whose radius is constant.
- the bearing surface 10 could, however, have another shape, for example being of increasing radius from the first edge 11 to the second edge 12.
- the wall 15 of the clearance 13 has itself a curved profile with a hump 21 in its central portion and two recesses 22, 23 in its two end portions.
- the recess 23 defines with the bearing surface 10 the first edge 1 1 and adjoins the base 24 and the end surface 18 of the hook 8.
- the wall 15 of the recess 13 could have, between the hollow 23 and the second edge 12, a straight profile.
- the recess 23 has an arcuate profile of radius R1 and its tangent plane at its line of junction with the end surface 18 of the hook 8 is the plane which contains said end surface 18.
- the hollow 23 joins the end surface 18 of the hook 8 to the rest of the wall 15 of the clearance 13 without forming of the edge with the end surface 18.
- the constraints that the base 24 of the hook 8 during the armature of the motor spring is therefore considerably reduced. This makes it possible to reduce the diameter of the barrel shaft 1.
- no edge is formed between the recess 23 and the second edge 12 in the clearance 13. In this way, the presence of any areas of weakness in the vicinity of the hook 8 is avoided.
- the radius R1 of the recess 23 is greater than or equal to 0.05 mm, or even 0.09 mm.
- the radius R1 may however be less than or equal to 0.5 mm.
- the radius R2 of the plug 7 is less than or equal to 1.15 mm, or even 1 mm, or even 0.85 mm.
- the radius R2 may however be greater than or equal to 0.75 mm.
- the radius R2 of the bung 7 is measured at the upstream end of the wall 15 of the clearance 13, that is to say that it is defined as the distance between the upstream end of the wall 15 of the clearance 13 and the axis A of the barrel shaft 1 and that it corresponds to the radius
- the upstream end of the wall 15 of the clearance 13 coincides with the downstream end of the bearing surface 10. In the example shown, these two ends are the second edge 12.
- the end surface 18 of the hook 8 may be slightly curved. In this case, not to form an edge between them, the end surface 18 and the recess 23 have their tangent planes at their junction line which are merged.
- FIG 3 illustrates a barrel shaft V according to another embodiment of the invention.
- This barrel shaft V differs from the barrel shaft 1 of Figures 1 and 2 by the shape of the clearance 13 'located upstream of the hook 8.
- the wall 15' of the clearance 13 ' comprises successively between the first edge 1 1 and the second edge 12, a flat surface 22 ', an arcuate recess 23' and an upstream surface 24 'which is flat in the example shown but which could also be curved.
- the first edge 11 is thus the intersection between the plane surface 22 'and the bearing surface 10.
- the second edge 12 is the intersection between the upstream surface 24' and the bearing surface 10.
- the flat surface 22 is in the same plane as the end surface 18 of the hook 8 and thus defines an extension 25 'for the end surface 18.
- the tangent plane of the recess 23' at its junction line with the flat surface 22 ' is the plane that contains surfaces 18 and 22 '.
- the hollow 23 ' forms no edge with the flat surface 22'.
- no edge is formed between the hollow 23 'and the upstream surface 24'.
- the end surface 18 of the hook 8 and / or the extension 25 ' may be slightly curved (s).
- extension of a given surface is meant in the present invention a surface that adjoins the given surface without forming an edge with it.
- the radius of the recess 23 ' can take the same values as those of the radius R1 illustrated in FIG. 2.
- the radius of the plug 7, measured at the upstream end of the wall 15' of the recess 13 ' can take the same values as the radius R2 shown in Figure 2.
- the second edge 12 could be removed.
- the upstream part of the wall 15, 15 'of the clearance 13, 13' and the downstream part of the bearing surface 10 could have their tangent planes at their junction line which are merged.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Springs (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP15175608 | 2015-07-07 | ||
| PCT/EP2016/060274 WO2017005394A1 (fr) | 2015-07-07 | 2016-05-09 | Arbre de barillet d'horlogerie |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3320402A1 true EP3320402A1 (fr) | 2018-05-16 |
| EP3320402B1 EP3320402B1 (fr) | 2019-07-24 |
Family
ID=53514104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16720862.8A Active EP3320402B1 (fr) | 2015-07-07 | 2016-05-09 | Arbre de barillet d'horlogerie |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3320402B1 (fr) |
| HK (1) | HK1247674B (fr) |
| WO (1) | WO2017005394A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH716092B1 (fr) | 2018-04-26 | 2022-10-31 | Patek Philippe Sa Geneve | Barillet d'horlogerie et procédé de modification de mouvement horloger. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2657794B1 (fr) * | 2012-04-25 | 2017-02-01 | ETA SA Manufacture Horlogère Suisse | Arbre et ressort de barillet |
| CH706641A2 (fr) * | 2012-06-22 | 2013-12-31 | Cartier Creation Studio Sa | Organe moteur pour mouvement d'horlogerie. |
| EP2703908A1 (fr) * | 2012-08-30 | 2014-03-05 | ETA SA Manufacture Horlogère Suisse | Arbre de barillet d'horlogerie |
-
2016
- 2016-05-09 WO PCT/EP2016/060274 patent/WO2017005394A1/fr not_active Ceased
- 2016-05-09 HK HK18107066.4A patent/HK1247674B/zh unknown
- 2016-05-09 EP EP16720862.8A patent/EP3320402B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3320402B1 (fr) | 2019-07-24 |
| WO2017005394A1 (fr) | 2017-01-12 |
| HK1247674B (zh) | 2020-04-03 |
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