US3690062A - Hard watch case - Google Patents

Hard watch case Download PDF

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Publication number
US3690062A
US3690062A US110960A US3690062DA US3690062A US 3690062 A US3690062 A US 3690062A US 110960 A US110960 A US 110960A US 3690062D A US3690062D A US 3690062DA US 3690062 A US3690062 A US 3690062A
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US
United States
Prior art keywords
watch case
case
external component
watch
mgo
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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.)
Expired - Lifetime
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US110960A
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English (en)
Inventor
Masami Kasai
Yoshiaki Fujimori
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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
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases

Definitions

  • oxides which have hitherto been used for the manufacture of brick, board, crucibles, and refractory tools can be fashioned into parts of watch cases or entire watch cases which are mechanically strong, resistant to abrasion, and resistant to corrosion.
  • Suitable oxides maybe the oxides of single metals such as Al or compounds as in the case of LII Mg0'Al 0bt3. Also oxides may be used along or in combination. These oxides, when pressed and sintered, are very hard, resistant to corrosion and mechanical defacement and make available a choice of colors.
  • Table I also gives data for tungsten carbide and for stainless steel and for gold. As is evident from the table tungsten carbide and gold are much heavier than the representative oxides tabulated. While the carbide is hard as shown by the corresponding entry in the table, stainless steel and gold are soft.
  • It is another object of the invention is to provide a A hard, durable, abrasion-resistant surface element of attraetive appearance for watch cases of conventional materials.
  • FIG. 1 is a sectional view of a watch case in which a composition in accordance with the present invention is used as a surface protection;
  • FIG. 2 is a sectional view of a watch case in which a bezel of a composition in accordance with the present invention is used to protect the top surface of a case of conventional composition;
  • FIG. 3 is a sectional view of a watch case in which an element having a composition in accordance with the present invention is used to protect the upper and side surfaces of a watch case of conventional composition;
  • FIG. 4 is a sectional view of a watch case, the entire body of which is made of a composition in accordance with the present invention.
  • a mixture of powdered raw material having a particle size of l-2 microns and consisting of 94 percent by weight of A1 0 3 percent by weight of SiO 1 percent by weight of MgO, 0.5 percent by weight of TiO;, and 1.5 percent by weight of Fe O is pulverized and mixed in a ball mill for about 100 hours.
  • a lubricant, preferably of the paraffin group, is added to make the mixture suitable for pressing.
  • the material is formed into the desired shape at a pressure of about 2 tonlcm
  • the composition is then sintered for about an hour at a temperature of 1650" to 1750 C.
  • the resultant product is extremely hard and is then diamondpolished.
  • the product is sapphire blue in color and has a Vickers hardness of 1650 to 1730. As a result of this great hardness, the surface resists scratching by knife, razor, scissors, glass or file. In addition to being resistant to mechanical defacement, the material also shows excellent resistance to artificial sweat and sea water. The material can therefore be considered sufficiently resistant to corrosion to be suitable for use as a watch case.
  • the specific gravity of the product is about 4.0 g/cc so that product cases are substantially lighter than conventional cases of stainless steel, gold, or gold alloy. Such cases are also lighter than cases made of carbide when sintered with heavy metal binders such as nickel, cobalt or molybdenum.
  • powdered raw material having a particle size of 1-2 microns and consisting of percent by weight of MgO'Al O 3.5 percent by weight of SiO 0.5 percent of C00 and 1.0 percent of MnO is treated in a manner similar to that described above.
  • the product of this example is also very hard and, can be polished only with diamond.
  • the product has a Vickers hardness of 1780 to 1860, its color is a beautiful blue, and its specific gravity is 3.8g/cc. It should be noted that this example differs from the previous example in that a compound oxide, namely MgO'Al O is used as the principal ingredient.
  • Materials which may be used alone or in combination are the simple oxides, A1 0 BeO, CeO Cu O, ch03, COO, F6203, F6304, MIIO, Nbzog, Slog, Ta2O Thoz, S1102, TIOZ, V203, ZI'IO and ZI'OZ,
  • oxides examples of such metals are Ni, Co, and Mo.
  • the hardness may be very substantiallyincreased by adding boron to compositions.
  • the hard layer 1 is superimposed on a case body 2 of stainless steel.
  • the hard layer 1 is attached to the case body 2 by cementing.
  • the case body being of stainless steel, is easily fabricated and the upper surface of the 'case is protected from marring by the superimposed hard layer 1.
  • the protective layer 1 is in the form of a bezel covering most of the outer surface of the case body 2.
  • the bezel is held to the body 2 by means of the snap-ring 3. Since the bezel is essentially non-deformable, deformability must by provided in the body; deformability of the body is provided bymeans of the groove 4 behind the snap-ring 3.
  • the outer case body 1 and the lug 5 are composed of materials of the type described herein.
  • the body 2 is made of stainless steel which, as mentioned above, is easily processed.
  • Grooves 3 and 4 are cut into the peripheral portion of 1 the inner case body and serve to permit insertion of a' binding agent for holding the outer case to the inner case body.
  • FIG. 4 shows a watch case in which the entire body including the back cover is made of one of the hard materials described herein. In a watch case of this design, no part of the case can be scratched.
  • a watch case resistant to mechanical defacemertt and corrosion having an external pressed and sintered component at least a part of which comprises at least one material selected from the group consisting of ihlgog, CeOz, CUZO, ch0 COO, PC2013, F6 0 MgO, MnO, NiO, Nb o SiO Ta O T1102, S1102, Tiog, V203, Z110, ZI'OZ, A1203 Slog, A1 0 TiO BeO A1 0 C00 A1 05, MgO -Al O MLO ZIOg SiO2, ZIIO A1203 and ZI'Og Slog.
  • a watch case as defined in claim 1 further comprising a metal selected from the group consisting of 5 Ni, Co and Mo.
  • a watch case as defined in claim 1 further comti l 285231 case as defined in claim 1 wherein said external component includes a case cover and a case body.
  • a watch case as defined in claim 1 further comprising a stainless steel body, the outer portion of which is covered by said pressed and sintered external component.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Powder Metallurgy (AREA)
  • Adornments (AREA)
US110960A 1970-01-30 1971-01-29 Hard watch case Expired - Lifetime US3690062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP767470A JPS546564B1 (de) 1970-01-30 1970-01-30

Publications (1)

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US3690062A true US3690062A (en) 1972-09-12

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US110960A Expired - Lifetime US3690062A (en) 1970-01-30 1971-01-29 Hard watch case

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US (1) US3690062A (de)
JP (1) JPS546564B1 (de)
GB (1) GB1339624A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841848A (en) * 1970-01-30 1974-10-15 Suwa Seikosha Kk HARD WATCH CASE COMPRISING TiN, T, AND AT LEAST ONE OF Mn, Al AND V
US3861990A (en) * 1972-03-27 1975-01-21 Suwa Seikosha Kk Exterior parts for a timepiece
US3998671A (en) * 1973-01-05 1976-12-21 A. Schild S.A. Process for the manufacture of a watch case with a visible highly invariable surface
US4226082A (en) * 1976-06-07 1980-10-07 Nobuo Nishida Ornamental part for watches and method of producing the same
DE3115738A1 (de) * 1980-04-22 1982-03-25 Citizen Watch Co., Ltd., Tokyo Verfahren zur herstellung eines uhrengehaeuses
US4327429A (en) * 1977-07-15 1982-04-27 Klingenberg Hans Ulrich Watchcase
US4367960A (en) * 1981-03-30 1983-01-11 Lisnow & Weiss Co, Inc. Watch case assembly
FR2538314A1 (fr) * 1982-12-25 1984-06-29 Kyocera Corp Article decoratif noir en zircone et procede pour sa preparation
CN104370534A (zh) * 2014-10-27 2015-02-25 合肥市东庐机械制造有限公司 一种切削刀具用抗磨特种陶瓷及其制备方法
EP3241636A1 (de) * 2016-05-03 2017-11-08 The Swatch Group Research and Development Ltd. Herstellungsverfahren eines verbundwerkstücks
CN109133885A (zh) * 2018-09-18 2019-01-04 广东蓝狮医疗科技有限公司 一种氧化锌掺杂的抗菌人工髋关节陶瓷球头的制备方法
CN110304920A (zh) * 2019-08-16 2019-10-08 Oppo广东移动通信有限公司 氧化锆陶瓷及其制备方法、壳体和电子设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH3079A (fr) * 1891-03-16 1891-06-15 Ferdinand Quartier Boîte de montre sans soudure, en Aluminium
US2672426A (en) * 1950-12-14 1954-03-16 Mallory & Co Inc P R Metal-ceramic bodies and method of making
US2843507A (en) * 1953-08-31 1958-07-15 Solar Aircraft Co Ceramic coatings and methods of formulation
US3179524A (en) * 1959-10-30 1965-04-20 Artrite Resins Ltd Inorganic co-polymeric materials and process
US3482951A (en) * 1967-07-19 1969-12-09 Robertson Co H H Porcelain enameled aluminum articles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH3079A (fr) * 1891-03-16 1891-06-15 Ferdinand Quartier Boîte de montre sans soudure, en Aluminium
US2672426A (en) * 1950-12-14 1954-03-16 Mallory & Co Inc P R Metal-ceramic bodies and method of making
US2843507A (en) * 1953-08-31 1958-07-15 Solar Aircraft Co Ceramic coatings and methods of formulation
US3179524A (en) * 1959-10-30 1965-04-20 Artrite Resins Ltd Inorganic co-polymeric materials and process
US3482951A (en) * 1967-07-19 1969-12-09 Robertson Co H H Porcelain enameled aluminum articles

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841848A (en) * 1970-01-30 1974-10-15 Suwa Seikosha Kk HARD WATCH CASE COMPRISING TiN, T, AND AT LEAST ONE OF Mn, Al AND V
US3861990A (en) * 1972-03-27 1975-01-21 Suwa Seikosha Kk Exterior parts for a timepiece
US3998671A (en) * 1973-01-05 1976-12-21 A. Schild S.A. Process for the manufacture of a watch case with a visible highly invariable surface
US4226082A (en) * 1976-06-07 1980-10-07 Nobuo Nishida Ornamental part for watches and method of producing the same
US4327429A (en) * 1977-07-15 1982-04-27 Klingenberg Hans Ulrich Watchcase
DE3115738A1 (de) * 1980-04-22 1982-03-25 Citizen Watch Co., Ltd., Tokyo Verfahren zur herstellung eines uhrengehaeuses
US4367960A (en) * 1981-03-30 1983-01-11 Lisnow & Weiss Co, Inc. Watch case assembly
FR2538314A1 (fr) * 1982-12-25 1984-06-29 Kyocera Corp Article decoratif noir en zircone et procede pour sa preparation
CN104370534A (zh) * 2014-10-27 2015-02-25 合肥市东庐机械制造有限公司 一种切削刀具用抗磨特种陶瓷及其制备方法
CN104370534B (zh) * 2014-10-27 2016-04-13 合肥市东庐机械制造有限公司 一种切削刀具用抗磨特种陶瓷及其制备方法
EP3241636A1 (de) * 2016-05-03 2017-11-08 The Swatch Group Research and Development Ltd. Herstellungsverfahren eines verbundwerkstücks
WO2017191050A1 (fr) * 2016-05-03 2017-11-09 The Swatch Group Research And Development Ltd Procede de fabrication d'une piece composite
CN109070229A (zh) * 2016-05-03 2018-12-21 斯沃奇集团研究和开发有限公司 用于制造复合部件的方法
US11701708B2 (en) 2016-05-03 2023-07-18 The Swatch Group Research And Development Ltd Method for fabrication of a composite part
CN109133885A (zh) * 2018-09-18 2019-01-04 广东蓝狮医疗科技有限公司 一种氧化锌掺杂的抗菌人工髋关节陶瓷球头的制备方法
CN110304920A (zh) * 2019-08-16 2019-10-08 Oppo广东移动通信有限公司 氧化锆陶瓷及其制备方法、壳体和电子设备

Also Published As

Publication number Publication date
JPS546564B1 (de) 1979-03-29
GB1339624A (en) 1973-12-05

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