EP0217251A1 - Magnetische Bremse für Uhren - Google Patents
Magnetische Bremse für Uhren Download PDFInfo
- Publication number
- EP0217251A1 EP0217251A1 EP86113006A EP86113006A EP0217251A1 EP 0217251 A1 EP0217251 A1 EP 0217251A1 EP 86113006 A EP86113006 A EP 86113006A EP 86113006 A EP86113006 A EP 86113006A EP 0217251 A1 EP0217251 A1 EP 0217251A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wheel
- magnet
- magnetic
- steel
- brake according
- 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
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- CLBRCZAHAHECKY-UHFFFAOYSA-N [Co].[Pt] Chemical compound [Co].[Pt] CLBRCZAHAHECKY-UHFFFAOYSA-N 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 3
- 229910000760 Hardened steel Inorganic materials 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- GUBSQCSIIDQXLB-UHFFFAOYSA-N cobalt platinum Chemical compound [Co].[Pt].[Pt].[Pt] GUBSQCSIIDQXLB-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000011090 solid board Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
- 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 train brake for a timepiece comprising a seconds wheel. It relates more particularly to a magnetic type brake with a fixed magnet.
- the object of the present invention is to produce a train brake which does not require additional height space, and which generates braking torque ensuring good positioning of the seconds hand, without appreciable increase in consumption.
- This object is achieved thanks to the fact that the seconds wheel is made of magnetic steel and in that the magnet is located in line with the periphery of this wheel, radially set back from the teeth.
- the plate 10 has a hole in which is driven a tube 16.
- the bridge 12 has a hole in which is driven a stone 18, itself provided with a hole, coaxial with the tube 16.
- the tube 16 and the stone 18 constitute the bearings of the wheel 14.
- the bridge 12 further comprises a hole offset from the stone 18, in which is advantageously fixed by driving, a magnet 20 with axial magnetization.
- This magnet 20 has a thickness substantially equal to that of the bridge 12. It has a cylindrical shape and a diameter substantially equal to that of the hole, so that it can be driven out there.
- the wheel 14 has a shaft 22 and a solid board 24. Both the shaft 22, which carries a pinion, and the board 24, are made of steel. The board 24 is driven out and riveted on the shaft 22.
- the periphery of the board 24 has teeth 26.
- the distance between the axis of the wheel 14 and the axis of the magnet 20 is such that the latter located in line with the periphery of the wheel 14, but radially set back from the toothing 26 of this wheel 14.
- Tests were carried out with watch movements fitted with a second hand which presented a positioning defect. This defect was due to the backlash and the bouncing of the gear train at the end of the driving impulse. To eliminate this defect, these movements were transformed by providing them with a steel wheel and a magnet driven into a hole in the bridge. More precisely, the seconds wheel, with a diameter of 2.2 mm and a thickness of 0.10 mm, is made of hardened Sandwik 14P steel (hardness 530 HV). This type of material has a coercive field substantially equal to 50 Oe and a remanent induction close to 9000 G.
- the magnet is made of platinum-cobalt, of diameter equal to 0.30 mm, of a length equal to 0.50 mm, driven into the bridge, the distance between the axis of the wheel and the axis of the hole being equal to 0.82 mm.
- the distance between the magnet and the wheel (the air gap) is 0.12 mm.
- Another type of magnetic material can be chosen.
- materials with a high coercive field anisotropic ferrites, cobalt platinum and materials based on rare earths, are the most suitable.
- the magnet, the wheel and the distance between them will be chosen so that the steel in front of the magnet is close to saturation. Practical tests have shown that satisfactory results are obtained with a cylindrical magnet whose length is approximately twice its diameter, with a wheel whose thickness is substantially equal to the air gap, the latter being three to six times less. to the length of the magnet. These dimensional relationships are applicable if the magnet is platinum-cobalt. If another material is used, the dimensional ratios must be modified as a function of the characteristics of the material and more particularly of its coercive field and of its residual induction. More precisely, the length and the diameter can respectively be reduced with the increase in the coercive field and the residual induction.
- platinum-cobalt is particularly well suited, despite its high cost. It has the advantage of not being sintered, hence a very high mechanical strength and machinability, which allows the magnet to be driven out without risk of breakage.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromechanical Clocks (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Suspension Of Electric Lines Or Cables (AREA)
- Soft Magnetic Materials (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH4248/85 | 1985-10-02 | ||
CH424885A CH661403GA3 (de) | 1985-10-02 | 1985-10-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0217251A1 true EP0217251A1 (de) | 1987-04-08 |
EP0217251B1 EP0217251B1 (de) | 1989-06-21 |
Family
ID=4272560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86113006A Expired EP0217251B1 (de) | 1985-10-02 | 1986-09-20 | Magnetische Bremse für Uhren |
Country Status (6)
Country | Link |
---|---|
US (1) | US4684263A (de) |
EP (1) | EP0217251B1 (de) |
JP (1) | JPS6291886A (de) |
CH (1) | CH661403GA3 (de) |
DE (1) | DE3664069D1 (de) |
HK (1) | HK86992A (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2602674A1 (de) * | 2011-12-07 | 2013-06-12 | ETA SA Manufacture Horlogère Suisse | Anzeigevorrichtung einer Uhr mit einer Kombination aus Anzeigeelementen |
EP2672334A1 (de) | 2012-06-07 | 2013-12-11 | Chopard Technologies SA | Uhrmechanismus mit Reduzierung der Verzahnungsspiele |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0187288U (de) * | 1987-12-02 | 1989-06-08 | ||
CH679823B5 (de) * | 1990-10-22 | 1992-10-30 | Ebauchesfabrik Eta Ag | |
JP2646946B2 (ja) * | 1992-12-02 | 1997-08-27 | セイコーエプソン株式会社 | 時 計 |
US6804172B2 (en) * | 2002-03-07 | 2004-10-12 | Seiko Instruments Inc. | Analog electronic timepiece including plural indicator wheels |
CH707471B1 (fr) * | 2013-08-05 | 2014-07-31 | Rd Engineering Rudolf Dinger | Système régulateur pour montre mécanique. |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE410706C (de) * | 1924-07-29 | 1925-03-05 | Tavannes Watch Co Sa | Triebwerk fuer einen mittelbar durch Zwischenraeder angetriebenen Sekundenzeiger |
FR1276205A (fr) * | 1960-12-14 | 1961-11-17 | Junghans Geb Ag | Dispositif destiné à empêcher les oscillations d'organes rotatifs dans les trains de transmission |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3978654A (en) * | 1973-06-07 | 1976-09-07 | Kabushiki Kaisha Suwa Seikosha | Motion transformer |
JPS5982706A (ja) * | 1982-11-02 | 1984-05-12 | Citizen Watch Co Ltd | 白金合金系複合材料磁石 |
-
1985
- 1985-10-02 CH CH424885A patent/CH661403GA3/fr not_active IP Right Cessation
-
1986
- 1986-09-08 US US06/904,588 patent/US4684263A/en not_active Expired - Lifetime
- 1986-09-20 DE DE8686113006T patent/DE3664069D1/de not_active Expired
- 1986-09-20 EP EP86113006A patent/EP0217251B1/de not_active Expired
- 1986-10-01 JP JP61231346A patent/JPS6291886A/ja active Pending
-
1992
- 1992-11-05 HK HK869/92A patent/HK86992A/xx not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE410706C (de) * | 1924-07-29 | 1925-03-05 | Tavannes Watch Co Sa | Triebwerk fuer einen mittelbar durch Zwischenraeder angetriebenen Sekundenzeiger |
FR1276205A (fr) * | 1960-12-14 | 1961-11-17 | Junghans Geb Ag | Dispositif destiné à empêcher les oscillations d'organes rotatifs dans les trains de transmission |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2602674A1 (de) * | 2011-12-07 | 2013-06-12 | ETA SA Manufacture Horlogère Suisse | Anzeigevorrichtung einer Uhr mit einer Kombination aus Anzeigeelementen |
CN103149829A (zh) * | 2011-12-07 | 2013-06-12 | Eta瑞士钟表制造股份有限公司 | 具有显示部件的组合的显示设备 |
US8750079B2 (en) | 2011-12-07 | 2014-06-10 | Eta Sa Manufacture Horlogere Suisse | Display device with a combination of display members |
CN103149829B (zh) * | 2011-12-07 | 2015-06-24 | Eta瑞士钟表制造股份有限公司 | 具有显示部件的组合的显示设备 |
EP2672334A1 (de) | 2012-06-07 | 2013-12-11 | Chopard Technologies SA | Uhrmechanismus mit Reduzierung der Verzahnungsspiele |
Also Published As
Publication number | Publication date |
---|---|
CH661403GA3 (de) | 1987-07-31 |
EP0217251B1 (de) | 1989-06-21 |
US4684263A (en) | 1987-08-04 |
DE3664069D1 (en) | 1989-07-27 |
JPS6291886A (ja) | 1987-04-27 |
HK86992A (en) | 1992-11-13 |
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