EP3218770A1 - Driving mechanism for a clock movement - Google Patents
Driving mechanism for a clock movementInfo
- Publication number
- EP3218770A1 EP3218770A1 EP15771056.7A EP15771056A EP3218770A1 EP 3218770 A1 EP3218770 A1 EP 3218770A1 EP 15771056 A EP15771056 A EP 15771056A EP 3218770 A1 EP3218770 A1 EP 3218770A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- barrel
- drum
- holding means
- motor member
- 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
- 230000000295 complement effect Effects 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
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
Definitions
- the invention relates to the field of timepieces, and more specifically a motor of a watch movement to accumulate and restore the energy necessary for the movement.
- the invention also relates to a movement and a timepiece equipped with such a motor member.
- a driving member for a timepiece consists of a barrel formed by a circular toothed disc and a drum closed by a cover.
- the barrel rotates freely on a shaft and receives a spring, generally formed of a ribbon wound on itself in a spiral around the barrel shaft, to which it is hooked by an inner coil through a bung, the outer turn being secured to the barrel drum in a fixed manner or in the form of friction.
- Some barrels are built without lids to gain thickness.
- the spring may tend to come out of the drum and come into contact with an element of the movement of the watch, such as a ratchet for example. This contact interferes with the proper functioning of the watch by creating friction and consequently variations and losses of torque.
- some constructions implement a drum with an inner face having a conical surface to constrain the spring towards the bottom of the barrel. It appears that this constraint is not sufficient in the case of barrels having large diameters or having high torques.
- DE 19 05 046 discloses a barrel for a watch movement, the barrel comprising a drum closed by a cover, the drum receiving a spring provided with a sliding flange.
- the drum has on its inner circular wall a shoulder configured to receive the sliding flange.
- US 2,880,570 also discloses a barrel comprising a drum closed by a cover and receiving a motor spring provided with a sliding flange.
- the drum also has on its inner circular wall a shoulder configured to receive the sliding flange.
- An object of the present invention is to overcome all or part of the disadvantages mentioned above by providing a motor member for axially maintaining the spring in the barrel regardless of the type of barrel.
- an object of the invention is to provide a spring having good axial retention within the barrel.
- the invention also aims, at least in a particular embodiment, to provide a drive member that is simple to implement and inexpensive.
- Another object of the invention is to provide a compact drive member to maintain the spring in the barrel and also to reduce the thickness of the watch movement.
- the invention relates to a motor unit for a watch movement provided with a barrel comprising a drum, and at least one spring, the spring being wound inside the barrel, the inner coil of the spring being coupled to a bung, and the outer coil of the spring being in contact with the circular wall of the drum.
- the drum comprises on its inner circular wall axial retention means of the spring, and the spring comprises complementary holding means configured to cooperate with the axial holding means so as to maintain the spring axially within the barrel .
- such a motor unit for a clockwork movement makes it possible to improve the stability of the torque provided by the barrel as well as the efficiency of the barrel, the axial retention of the spring in the barrel preventing the spring from coming out of the drum and of come into contact with an element of the drive member, typically the cover or the ratchet.
- the axial retention means comprise a peripheral shoulder
- the complementary holding means comprise an outer turn of height less than the height of the rest of the spring so that the outer turn is retained by the shoulder;
- the axial holding means comprise a peripheral groove;
- the axial holding means comprise at least one radial lug on the outer face of the outer coil, the lug housing at least partially in the groove;
- the spring comprises a plurality of radial lugs distributed on the outer face of the outer coil
- the lugs are equidistant from one another
- the lugs are located in a transverse plane passing through the center of the spring;
- the spring comprises on the inner face of its outer turn a sliding flange.
- the invention also relates to a watch movement comprising at least one motor unit according to the invention.
- FIG. 1 is a perspective view of a spring according to the invention according to a first embodiment
- FIG. 2 is a sectional view along the vertical median plane of a motor member according to the invention according to a first embodiment
- FIG. 3 is a perspective view of a spring according to the invention according to a second embodiment
- FIG. 4 is a sectional view along the vertical median plane of a motor member according to the invention according to a second embodiment.
- the motor unit 100 for a watch movement is provided with a barrel 1 comprising a base 10 secured to a drum January 1.
- a spring 2 is wound inside the barrel 1, the inner coil 21 of the spring 2 being coupled to a bung 4 disposed around a shaft 5, and the outer coil 20 of the spring 2 being in contact with the circular wall of the drum 1 1.
- the drum 1 1 comprises on its inner circular wall axial holding means of the spring 2, and the spring 2 comprises complementary holding means configured to cooperate with the axial holding means so as to maintain the spring axially 2 in the barrel 1.
- the spring 2 has at its outer turn 20 a lowering so that the height h of the outer turn 20 is lower than the rest of the spring 2 which has a height H.
- the spring 2 can, for example, be lowered one turn and 15 ° so that the outer turn 20 comes to be fully housed in the shoulder 13 peripheral.
- the drum 1 1 has a shoulder 13 on its inner circular wall, the shoulder 13 having a height substantially identical to the height h of the outer turn 20 so as to maintain axially the outer turn 20, and implicitly the spring 2.
- the spring 2 may be equipped with a sliding flange 23 on the inner face of the outer turn 20, so as to maintain the spring against the inner wall of the drum January 1.
- the motor member 100 has a barrel 1 without a lid, a ratchet 3 being disposed of above the barrel 1 and drives the plug 4 disposed around the shaft 5.
- the outer turn 20 is disposed at the shoulder 1 3.
- the spring 2 whose outer turn 20 has on its outer face a plurality of lugs 22 intended to cooperate with a peripheral groove 12 machined on the inner circular wall of the drum January 1.
- the lugs 22 are arranged equidistant from each other on the outer face of the outer turn 20 to ensure better axial retention of the spring 2.
- the spring 2 may be equipped with a sliding flange 23 on the inner face of the outer turn 20, so as to maintain the spring against the inner wall of the drum January 1.
- the spring 2 can be made in one piece and is in the form of a ribbon.
- the spring can thus be mounted on the bung 4 around the shaft of the barrel.
- the spring 2 may have a height of 1.30 mm, this height may be slightly greater than that of the cylinder as shown in Figure 2.
- the lugs 22 are located in a transverse plane passing through the center of the spring, and may have a diameter of between 0.4 mm and 0.6 m, and a depth of between 0.05 mm and 0.1 mm.
- the drum 1 1 comprises on its inner circular wall a peripheral groove 12 configured to at least partially receive the lug 22 of the spring 2 so as to maintain the spring 2 axially within the barrel 1.
- the inner circular wall of the drum 1 1 comprises a shoulder adapted to at least partially retain the lug 22 of the spring 2, the shoulder extending preferably from the bottom 10 of the barrel 1 up to half the height of the inner circular wall of the drum 1 1.
- the motor member 100 has a barrel 1 without a lid, a ratchet 3 being disposed above the barrel 1 and drives the plug 4 arranged around the shaft 5.
- the spring 2 may protrude slightly from the barrel 1, thus making it possible to limit the bulk of the barrel 1.
- the invention also relates to a watch movement and a timepiece equipped with a motor member 100 according to the invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Electromechanical Clocks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14192690.7A EP3021172A1 (en) | 2014-11-11 | 2014-11-11 | Motor member for a clock movement |
PCT/EP2015/071262 WO2016074831A1 (en) | 2014-11-11 | 2015-09-16 | Driving mechanism for a clock movement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3218770A1 true EP3218770A1 (en) | 2017-09-20 |
EP3218770B1 EP3218770B1 (en) | 2019-04-24 |
Family
ID=51868148
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14192690.7A Withdrawn EP3021172A1 (en) | 2014-11-11 | 2014-11-11 | Motor member for a clock movement |
EP15771056.7A Active EP3218770B1 (en) | 2014-11-11 | 2015-09-16 | Motor member for a clock movement |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14192690.7A Withdrawn EP3021172A1 (en) | 2014-11-11 | 2014-11-11 | Motor member for a clock movement |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP3021172A1 (en) |
WO (1) | WO2016074831A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH712519B8 (en) * | 2016-06-01 | 2023-03-31 | Richemont Int Sa | Engine member for a timepiece. |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US374359A (en) * | 1887-12-06 | Chakles t | ||
CH151392A (en) * | 1930-09-17 | 1931-12-15 | Tavannes Watch Co Sa | Barrel. |
DE1905046A1 (en) * | 1969-02-01 | 1970-08-06 | Durowe Gmbh | Barrel for wristwatches with automatic winding |
-
2014
- 2014-11-11 EP EP14192690.7A patent/EP3021172A1/en not_active Withdrawn
-
2015
- 2015-09-16 WO PCT/EP2015/071262 patent/WO2016074831A1/en active Application Filing
- 2015-09-16 EP EP15771056.7A patent/EP3218770B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2016074831A1 (en) | 2016-05-19 |
EP3218770B1 (en) | 2019-04-24 |
EP3021172A1 (en) | 2016-05-18 |
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