US3919836A - Magnetic-resistant watch case - Google Patents

Magnetic-resistant watch case Download PDF

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Publication number
US3919836A
US3919836A US515032A US51503274A US3919836A US 3919836 A US3919836 A US 3919836A US 515032 A US515032 A US 515032A US 51503274 A US51503274 A US 51503274A US 3919836 A US3919836 A US 3919836A
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casing
ring
assembly
dial support
movement
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Expired - Lifetime
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US515032A
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Akio Nishizawa
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Suwa Seikosha KK
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Suwa Seikosha KK
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    • 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
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields

Definitions

  • ABSTRACT Forelgn Apphcauo Pnomy Data A magnetic-resistant watch case assembly comprising Oct. 16 1973 Japan .4 48-115321 a dial sup ort and a casing-ring both made of a high-permeability material and surrounding a watch [52] US. Cl 58/ 106.5; 58/94 ve nt to po ition and fix the watch movement in [51] Int. CLZ G04B 43/00; 60413 37/04 the watch case, [58] Field of Search 58/94, 106.5
  • FIG 7 MAGNETIC-RESISTANT WATCH CASE FIELD OF THE INVENTION This invention relates to a magnetic-resistant watch case which has high magnetic-resistance and low cost.
  • a watch case assembly which comprises a case structure, a watch movement disposed in said case structure, a dial support covering said movement on one side thereof, and a casing ring covering the movement at the other side thereof, said dial support and casing ring both being made of high permeability material and cooperatively surrounding said watch movement and including means positioning and securing the watch. movement in the case structure.
  • At least one of the dial support and casing ring includes an integral cylindrical portion laterally encircling the watch movement and projecting towards the other.
  • both said dial support and casing ring include respective cylindrical portions projecting towards one another and lateral rim portions are provided on said cylindrical portions at the ends thereof.
  • the watch movement can have steps formed therein at its top and bottom peripheral portions and the dial support and casing ring can be seated in said steps to secure and position the watch movement.
  • FIG. 1 is a vertical section showing a portion of a conventional watch
  • FIG. 2 is a vertical section showing a corresponding portion of an embodiment according to the invention.
  • FIGS. 3 to 8 are vertical sections of other embodiments of the invention.
  • FIG. 1 which shows an embodiment of a conventional magnetic-resistant structure
  • high-permeability material is used at three places, i.e. at a plate 1 below a dial, a casing-ring 2 and a back plate 3.
  • the plate 1 is held between a dial 4 and a ring 5 for supporting the dial.
  • the casing-ring 2 is inserted between a movement 6 and a case band 7 to center the movement as well as to fix the movement with the use of upward force of a back cover 8.
  • the back plate 3 is fixed to the inner surface of the back cover 8.
  • Such a conventional magnetic-resistant watch structure is high in cost because the high-permeability material is distributed to three members and the casing-ring requires a pressing process and a cutting process. Furthermore, the magnetic-resistance of such structure is not sufficient because the members constituted of the high-permeability material have wide gaps therebetween, and thereby the movement is readily influenced by an external magnetic field.
  • a dial support 9 is formed of a plate member of high-permeability material by means of a drawing press to include a disc portion 9a, a depending cylindrical portion 9b and a rim portion 9c.
  • the support 9 covers the upper portion of a movement 10.
  • a drawing press to include a disc portion 9a, a depending cylindrical portion 9b and a rim portion 9c.
  • the support 9 covers the upper portion of a movement 10.
  • casing-ring 11 is formed of a plate member of highpermeability material by means of a drawing press to include a disc portion 11a, a cylindrical portion 11b and a rim portion 11c.
  • the ring 11 covers the lower portion of the movement 10.
  • the movement 10 is provided with recesses defining shoulders 10a and 10b at its periphery at positions corresponding to the cylindrical portions and the rim portions of the dial support and the casing-ring respectively.
  • the movement is held between the rim portions of the dial support and the casing-ring.
  • the rim portions are held between an upper cylindrical portion 12a of a back cover 12 and a shoulder 13a of an inner step portion of a case band 13 by the upward force of the back cover.
  • a dial 14 is fixed to the movement so that the dial support is sandwiched therebetween.
  • the members of high-permeability material which cover the movement have only a relatively small gap therebetween and the movement is not substantially influenced by an external magnetic field.
  • the invention provides an excellent magnetic-resistant watch case.
  • a depending cylindrical lip portion 9d is provided at the periphery of the rim 9c of the dial support 9.
  • the high-permeability members covering the movement have substantially no gap.
  • the magnetic-resistance of the watch case is even greater thereby.
  • an upward cylindrical lip portion 11d is provided at the periphery of the rim 110 of the casingring 11 to achieve the same effect as in FIG. 3.
  • both members can be interchangeable and can be manufactured in equivalent manner so that the cost price is further reduced.
  • the casing-ring 11 is provided with openings lle and 11f at positions corresponding to projected portions and 10d of the movement 10.
  • the height of the cylindrical portion 11b of the casing-ring can be reduced so that the total thickness of the watch case can be reduced.
  • the highpermeability member may be locally thickened or thinned as shown at the rim 9c of the dial support 9, for the purpose of providing increased strength or the like.
  • the construction according to this invention improves the magnetic-resistance of a watch case and reduces its cost price and it is very effective in practice applicable to all sizes and shapes of watches.
  • a magnetic-resistant watch case assembly comprising a case structure, a watch movement disposed in said case structure, a dial support covering said movement at one side thereof, and a casing-ring covering the movement at the other side thereof, said dial support and casing-ring both being made of high-permeability material and cooperatively surrounding said watch movement, at least one of the dial support and casingring including an integral cylindrical portion laterally encircling the watch movement and projecting towards the other, and a lateral rim portion on said cylindrical portion at the end thereof, said watch movement having a step therein, said cylindrical portion and rim portion being seated in said step to position and secure the watch movement in the case structure.
  • both said dialsupport and casing-ring include respective cylindrical portions projecting towards one another and lateral rim portions on said cylindrical portions at the ends thereof.
  • one of said dial support and casing-ring includes a cylindrical lip portion on the rim portion thereof, said lip portion encircling the watch movement in the region between the rim portions of the dial support and casing ring.

Abstract

A magnetic-resistant watch case assembly comprising a dial support and a casing-ring both made of a high-permeability material and surrounding a watch movement to position and fix the watch movement in the watch case.

Description

United States Patent 1191 Nishizawa Nov. 18, 1975 MAGNETIC-RESISTANT WATCH CASE [56] References Cited [75] Inventor: Akio Nishizawa, Okaya, Japan UNITED STATES PATENTS [73] Assignee: Kabushiki Kaisha Suwa Seikosha, 1247470 11/ 1917 Turney .5 58/1065 Tokyo, Japan Primary E.\'amz'nerGeorge H. Miller, Jr. [22] Ffled' 1974 Attorney, Agent, or Firm-Waters, Schwartz & Nissen [21] Appl. No.: 515,032
[57] ABSTRACT [30] Forelgn Apphcauo Pnomy Data A magnetic-resistant watch case assembly comprising Oct. 16 1973 Japan .4 48-115321 a dial sup ort and a casing-ring both made of a high-permeability material and surrounding a watch [52] US. Cl 58/ 106.5; 58/94 ve nt to po ition and fix the watch movement in [51] Int. CLZ G04B 43/00; 60413 37/04 the watch case, [58] Field of Search 58/94, 106.5
9 Claims, 8 Drawing Figures ,1 I I I x r f l 1/ .[LJ/l/J/J/I US. Patent Nov. 18, 1975 Sheet10f4 3,919,836
US. Patent Nov. 18,1975 Sheet30f4 3,919,836
US. Patent Nov. 18, 1975 Sheet40f4 3,919,836
FIG 7 MAGNETIC-RESISTANT WATCH CASE FIELD OF THE INVENTION This invention relates to a magnetic-resistant watch case which has high magnetic-resistance and low cost.
BACKGROUND In electric or electronic timepieces, a high-permeability material is sometimes provided inside its case and around its movement to improve its magnetic-resistance. In a. timepiece driven by a mainspring, similar provision may be taken if the magnetic-resistance must be particularly improved. Conventional magneticresistant watch cases used in such cases are not suitable because their magnetic-resistant effect is relativelylow and their price is high.
SUMMARY OF THE INVENTION According to the invention, a watch case assembly is provided which comprises a case structure, a watch movement disposed in said case structure, a dial support covering said movement on one side thereof, and a casing ring covering the movement at the other side thereof, said dial support and casing ring both being made of high permeability material and cooperatively surrounding said watch movement and including means positioning and securing the watch. movement in the case structure.
At least one of the dial support and casing ring includes an integral cylindrical portion laterally encircling the watch movement and projecting towards the other.
In a particular embodiment both said dial support and casing ring include respective cylindrical portions projecting towards one another and lateral rim portions are provided on said cylindrical portions at the ends thereof.
The watch movement can have steps formed therein at its top and bottom peripheral portions and the dial support and casing ring can be seated in said steps to secure and position the watch movement.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a vertical section showing a portion of a conventional watch,
FIG. 2 is a vertical section showing a corresponding portion of an embodiment according to the invention, and
FIGS. 3 to 8 are vertical sections of other embodiments of the invention.
DETAILED DESCRIPTION OF DRAWING Referring to FIG. 1 which shows an embodiment of a conventional magnetic-resistant structure, therein high-permeability material is used at three places, i.e. at a plate 1 below a dial, a casing-ring 2 and a back plate 3. The plate 1 is held between a dial 4 and a ring 5 for supporting the dial. The casing-ring 2 is inserted between a movement 6 and a case band 7 to center the movement as well as to fix the movement with the use of upward force of a back cover 8. The back plate 3 is fixed to the inner surface of the back cover 8.
Such a conventional magnetic-resistant watch structure is high in cost because the high-permeability material is distributed to three members and the casing-ring requires a pressing process and a cutting process. Furthermore, the magnetic-resistance of such structure is not sufficient because the members constituted of the high-permeability material have wide gaps therebetween, and thereby the movement is readily influenced by an external magnetic field.
This invention eliminates the above defects and will be described with reference to the embodiment shown in FIG. 2.
Therein a dial support 9 is formed of a plate member of high-permeability material by means of a drawing press to include a disc portion 9a, a depending cylindrical portion 9b and a rim portion 9c. The support 9 covers the upper portion of a movement 10. Similarly, a
casing-ring 11 is formed of a plate member of highpermeability material by means of a drawing press to include a disc portion 11a, a cylindrical portion 11b and a rim portion 11c. The ring 11 covers the lower portion of the movement 10.
The movement 10 is provided with recesses defining shoulders 10a and 10b at its periphery at positions corresponding to the cylindrical portions and the rim portions of the dial support and the casing-ring respectively. The movement is held between the rim portions of the dial support and the casing-ring. The rim portions are held between an upper cylindrical portion 12a of a back cover 12 and a shoulder 13a of an inner step portion of a case band 13 by the upward force of the back cover. Thus the movement is fixed. A dial 14 is fixed to the movement so that the dial support is sandwiched therebetween.
According to this invention, only two members are made of high-permeability material and only the two members require the use of a drawing press. Accordingly, the cost price is reduced. Furthermore, the members of high-permeability material which cover the movement have only a relatively small gap therebetween and the movement is not substantially influenced by an external magnetic field. Thus, the invention provides an excellent magnetic-resistant watch case.
In FIG. 3, a depending cylindrical lip portion 9d is provided at the periphery of the rim 9c of the dial support 9. In this structure, the high-permeability members covering the movement have substantially no gap. The magnetic-resistance of the watch case is even greater thereby.
In FIG. 4, an upward cylindrical lip portion 11d is provided at the periphery of the rim 110 of the casingring 11 to achieve the same effect as in FIG. 3.
As shown in FIG. 5, if the watch is designed so that the dial support 9 and the casing-ring l 1 have the same shape and size, both members can be interchangeable and can be manufactured in equivalent manner so that the cost price is further reduced.
In FIG. 6, the casing-ring 11 is provided with openings lle and 11f at positions corresponding to projected portions and 10d of the movement 10. In this case, the height of the cylindrical portion 11b of the casing-ring can be reduced so that the total thickness of the watch case can be reduced. Additionally, the highpermeability member may be locally thickened or thinned as shown at the rim 9c of the dial support 9, for the purpose of providing increased strength or the like.
As shown in FIG. 7, if a shock-absorbent member 15 is provided between the rim 11c of the casing-ring 11 and the upper cylindrical portion 12a of the back cover 12, variation of interference of a gasket 16 of the back cover can be reduced as much as possible because the shock-absorbent member 15 absorbs various kinds of size variation of the members which fix the movement As shown in FIG. 8, the same effect as in FIG. 7 can beobtained by disposing the shock-absorbent member 15 between a peripheral stepped portion lb of the movement 10 and an upper cylindrical portion 11g of the casing-ring 11, with the cylindrical portion 11b of the casing ring 11 being further stepped to form the upper cylindrical portion 11g. The same effect is obtained even if the dial support 9 is not provided with the cylindrical portion nor the rim portion as in the previous embodiments.
The construction according to this invention improves the magnetic-resistance of a watch case and reduces its cost price and it is very effective in practice applicable to all sizes and shapes of watches. 3
What is claimed is:,
l. A magnetic-resistant watch case assembly comprising a case structure, a watch movement disposed in said case structure, a dial support covering said movement at one side thereof, and a casing-ring covering the movement at the other side thereof, said dial support and casing-ring both being made of high-permeability material and cooperatively surrounding said watch movement, at least one of the dial support and casingring including an integral cylindrical portion laterally encircling the watch movement and projecting towards the other, and a lateral rim portion on said cylindrical portion at the end thereof, said watch movement having a step therein, said cylindrical portion and rim portion being seated in said step to position and secure the watch movement in the case structure.
2. An assembly as claimed in claim 1, wherein both said dialsupport and casing-ring include respective cylindrical portions projecting towards one another and lateral rim portions on said cylindrical portions at the ends thereof.
3. An assembly as claimed in claim 2 wherein said watch movement has a plurality of steps therein, said cylindrical portion and rim portion of the dial support and the casing-ring being seated in respective of said steps.
4. An assembly as claimed in claim 3, wherein one of said dial support and casing-ring includes a cylindrical lip portion on the rim portion thereof, said lip portion encircling the watch movement in the region between the rim portions of the dial support and casing ring.
5. An assembly as claimed in claim 3, wherein at least one of said dial support and casing-ring includes a local portion of different thickness from the remainder thereof.
6. An assembly as claimed in claim 3, wherein at least one of said dial support and casing-ring has an aperture to accommodate a projection provided on said watch movement.
7. An assembly as claimed in claim 3, further comprising a back plate and a shock-absorbing member engaged between said back plate and said casing-ring.
8. An assembly as claimed in claim 3, further comprising a shock-absorbing member engaged between said casing-ring and said watch movement.
9. An assembly as claimed in claim 3, wherein said dial support and casing-ring are symmetrical and interchangeable.

Claims (9)

1. A magnetic-resistant watch case assembly comprising a case structure, a watch mOvement disposed in said case structure, a dial support covering said movement at one side thereof, and a casing-ring covering the movement at the other side thereof, said dial support and casing-ring both being made of high-permeability material and cooperatively surrounding said watch movement, at least one of the dial support and casing-ring including an integral cylindrical portion laterally encircling the watch movement and projecting towards the other, and a lateral rim portion on said cylindrical portion at the end thereof, said watch movement having a step therein, said cylindrical portion and rim portion being seated in said step to position and secure the watch movement in the case structure.
2. An assembly as claimed in claim 1, wherein both said dial support and casing-ring include respective cylindrical portions projecting towards one another and lateral rim portions on said cylindrical portions at the ends thereof.
3. An assembly as claimed in claim 2 wherein said watch movement has a plurality of steps therein, said cylindrical portion and rim portion of the dial support and the casing-ring being seated in respective of said steps.
4. An assembly as claimed in claim 3, wherein one of said dial support and casing-ring includes a cylindrical lip portion on the rim portion thereof, said lip portion encircling the watch movement in the region between the rim portions of the dial support and casing ring.
5. An assembly as claimed in claim 3, wherein at least one of said dial support and casing-ring includes a local portion of different thickness from the remainder thereof.
6. An assembly as claimed in claim 3, wherein at least one of said dial support and casing-ring has an aperture to accommodate a projection provided on said watch movement.
7. An assembly as claimed in claim 3, further comprising a back plate and a shock-absorbing member engaged between said back plate and said casing-ring.
8. An assembly as claimed in claim 3, further comprising a shock-absorbing member engaged between said casing-ring and said watch movement.
9. An assembly as claimed in claim 3, wherein said dial support and casing-ring are symmetrical and interchangeable.
US515032A 1973-10-16 1974-10-15 Magnetic-resistant watch case Expired - Lifetime US3919836A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121414A (en) * 1975-12-23 1978-10-24 Kabushiki Kaisha Seikosha Alarm timepiece
US4165604A (en) * 1976-06-08 1979-08-28 Citizen Watch Co., Ltd. Solar battery timepiece
US4276629A (en) * 1976-06-08 1981-06-30 Citizen Watch Company Limited Solar battery timepiece
US4317188A (en) * 1977-02-17 1982-02-23 Kabushiki Kaisha Suwa Seikosha Magnetic shielding plate for a step motor in an electronic wristwatch
EP0884662A3 (en) * 1997-06-13 2001-01-10 Junghans Uhren GmbH Watch with transponder
US20040062151A1 (en) * 2002-08-28 2004-04-01 Shigeru Miyama Timepiece
WO2007012939A1 (en) * 2005-07-29 2007-02-01 Richemont International S.A. Case for screening magnetic fields
US20110038234A1 (en) * 2009-08-17 2011-02-17 The Swatch Group Research And Development Ltd. Magnetic protection for a timepiece balance spring
DE102009044651A1 (en) * 2009-11-25 2011-05-26 Vacuumschmelze Gmbh & Co. Kg Mechanical clock i.e. mechanical wristwatch, has magnetic shields made of alloy and comprising pot and lid that are connected with each other using spring and screw thread, where separated parts of shields are designed in plate-shape
US20130155819A1 (en) * 2011-12-19 2013-06-20 Nivarox-Far S.A. Timepiece movement with low magnetic sensitivity
US20150212491A1 (en) * 2014-01-24 2015-07-30 The Swatch Group Management Services Ag Device for securing a timepiece dial

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754072Y2 (en) * 1977-02-18 1982-11-22
JPS532262U (en) * 1977-06-13 1978-01-11
JPS6143258Y2 (en) * 1981-02-13 1986-12-06
JP4631639B2 (en) * 2005-09-27 2011-02-16 カシオ計算機株式会社 Clock device
JP4655894B2 (en) * 2005-11-10 2011-03-23 カシオ計算機株式会社 Clock device
JP6807293B2 (en) 2017-09-26 2021-01-06 日立建機株式会社 Work machine
JP6849623B2 (en) 2018-03-07 2021-03-24 日立建機株式会社 Work machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1247470A (en) * 1916-06-12 1917-11-20 Eugene T Turney Non-magnetizable watch.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH122391A (en) * 1926-10-22 1927-09-16 Ditisheim Paul Watch.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1247470A (en) * 1916-06-12 1917-11-20 Eugene T Turney Non-magnetizable watch.

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121414A (en) * 1975-12-23 1978-10-24 Kabushiki Kaisha Seikosha Alarm timepiece
US4165604A (en) * 1976-06-08 1979-08-28 Citizen Watch Co., Ltd. Solar battery timepiece
US4276629A (en) * 1976-06-08 1981-06-30 Citizen Watch Company Limited Solar battery timepiece
US4317188A (en) * 1977-02-17 1982-02-23 Kabushiki Kaisha Suwa Seikosha Magnetic shielding plate for a step motor in an electronic wristwatch
EP0884662A3 (en) * 1997-06-13 2001-01-10 Junghans Uhren GmbH Watch with transponder
US20040062151A1 (en) * 2002-08-28 2004-04-01 Shigeru Miyama Timepiece
US6824304B2 (en) * 2002-08-28 2004-11-30 Seiko Instruments Inc. Timepiece
US20080273427A1 (en) * 2005-07-29 2008-11-06 Richemont International Sa Case for Screening Magnetic Fields
WO2007012939A1 (en) * 2005-07-29 2007-02-01 Richemont International S.A. Case for screening magnetic fields
US20110038234A1 (en) * 2009-08-17 2011-02-17 The Swatch Group Research And Development Ltd. Magnetic protection for a timepiece balance spring
US8337078B2 (en) * 2009-08-17 2012-12-25 The Swatch Group Research And Development Ltd Magnetic protection for a timepiece balance spring
DE102009044651A1 (en) * 2009-11-25 2011-05-26 Vacuumschmelze Gmbh & Co. Kg Mechanical clock i.e. mechanical wristwatch, has magnetic shields made of alloy and comprising pot and lid that are connected with each other using spring and screw thread, where separated parts of shields are designed in plate-shape
DE102009044651B4 (en) * 2009-11-25 2011-11-03 Vacuumschmelze Gmbh & Co. Kg Clock with magnetic shield
US20130155819A1 (en) * 2011-12-19 2013-06-20 Nivarox-Far S.A. Timepiece movement with low magnetic sensitivity
US9004747B2 (en) * 2011-12-19 2015-04-14 Nivarox-Far S.A. Timepiece movement with low magnetic sensitivity
US20150212491A1 (en) * 2014-01-24 2015-07-30 The Swatch Group Management Services Ag Device for securing a timepiece dial
US9535403B2 (en) * 2014-01-24 2017-01-03 The Swatch Group Management Services Ag Device for securing a timepiece dial

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Publication number Publication date
JPS546223B2 (en) 1979-03-26
JPS5067169A (en) 1975-06-05

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