GB2134025A - Joint structure of watch body and auxiliary part - Google Patents
Joint structure of watch body and auxiliary part Download PDFInfo
- Publication number
- GB2134025A GB2134025A GB08400311A GB8400311A GB2134025A GB 2134025 A GB2134025 A GB 2134025A GB 08400311 A GB08400311 A GB 08400311A GB 8400311 A GB8400311 A GB 8400311A GB 2134025 A GB2134025 A GB 2134025A
- Authority
- GB
- United Kingdom
- Prior art keywords
- watch body
- auxiliary part
- joint structure
- welding
- joint
- 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
- G04B37/00—Cases
- G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/14—Projection welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
A watch body (20) is welded to an auxiliary part (22) e.g. a band end link, a watchglass bezel, a winding stem pipe, a decoration, through a welding insert (24) brazed to the body and to which the auxiliary part is projection welded. <IMAGE>
Description
SPECIFICATION
Joint structure of watch body and auxiliary part
This invention relates to a joint structure of a watch body and an auxiliary part.
In the following, the term "band end link" has the usual meaning in the art, of a wristwatch band end link connecting a wristwatch band to a watch body and having a hole in the direction of width of the wristwatch band for being inserted a connecting pin which connects a neighbour link thereto. Specifically, the term "band end link" has the meaning of the band end link which is connected to the watch body, in this invention.
The term "bezel" has the meaning of a watchglass bezel connected to the watch body and having a step portion for adapting a watchglass therein. The term "winding stem pipe" has the meaning of a pipe connected into a transverse hole of the watch body for passing a winding stem. The term "decoration" has the meaning of a decoration connected to the watch body. The term "band connecting leg" has the same meaning as the band end link. The term "auxiliary part" as used in the following description and in the appending claims has the meaning of a collective term designating the band end link, watchglass bezel, winding stem pipe, decoration, band connecting leg or parts of these kinds.
The watch case of a wristwatch that employs a cemented carbide have come into use in recent years because they are difficult to scratch and have a ground surface which exhibits elegance different from the watch case used metal materials as stainless steel, nickel silver and brass.
As shown in Figs. 1 and 2, the outer fittings of a wristwatch generally are of a structure wherein such auxiliary parts as a winding stem pipe 12, bezel 14, decorative trim 16 and band connecting leg 18 are connected to a watch body 10. When the watch body 10 is constructed of a cemented carbide, these auxiliary parts are bonded to the watch body 10 by using an organic bonding agent. However, it is difficult to bond the auxiliary parts to the watch body 10 without overflowing the bonding agent, therefore, this bonding method requires skill in effecting the bonding operation. Further, the organic bonding agent deteriorates with the passage of time, whereby the adhesive force of the bonding portion is unsatisfactory.
It can be used to braze as another method.
However, in a case where there is a large difference between the coefficients of thermal expansion of the auxiliary parts and the watch body 10 consisting of the cemented carbide, it is difficult to joint them in the large surface areas for getting high joining strength. Further, it is difficult to select materials which have coefficients of thermal expansion close to that of the cemented carbide and which, at the same time, exhibit the corrosion resistance and highly precise workability needed for outer parts of timepieces. Even if materials excelling in coefficients of thermal expansion, workability and corrosion resistance can be found, surfaces of cemented carbide materials are changed by the-thermal effects of brazing. Furthermore, it is difficult to directly weld the auxiliary parts to the watch body 10 made of the cemented carbide by the thermal effects of the welding.
According to the present invention, there is provided a joint structure of a watch body and auxiliary part, comprising: a watch body having a joint portion; an auxiliary part having a joint portion; and a welding target provided to one of said joint portions; wherein said auxiliary part is welded to said watch body through said welding target.
In the attached drawings:
Figs. 1 and 2 are partial sectional views showing a wristwatch case structure used in the prior art;
Fig. 3 is a partial sectional view showing a joint structure according to the present invention, wherein a band end link is welded to a watch body using a cemented carbide material;
Fig. 4 is a perspective view illustrating the band end link of Fig. 3;
Fig. 5 is an explanatory view illustrating a joint strength measuring method;
Fig. 6 is a partial sectional view illustrating a joint structure in which a winding stem pipe is joined to a watch body comprising a cemented carbide alloy in accordance with the present invention;
Fig. 7 is a partial sectional view illustrating a joint structure wherein a bezel employing a cemented carbide material is jointed to a watch body in accordance with the present invention;;
Fig. 8 is a perspective view illustrating the back surface of a cemented carbide bezel having welding targets for welding; and
Fig. 9 is a partial sectional view illustrating a structure wherein a decorative member is welded to a watch body comprising a cemented carbide material in accordance with the present invention.
Referring to Fig. 3, there is shown the first embodiment of the present invention. An end link 22 of a metal watch band is jointed directly, by means of welding, to a watch body 20 comprising a cemented carbide of 13% tungsten carbide (WC)5% chromium (Cr)-Cobalt (Co).
A welding target 24, consisting of pure titanium (Ti), is brazed in a recess 20b which is formed at each outer surface 20a provided in the 12-6 hour direction. This brazing is carried out in a 4x 10-6 torr vacuum. A 14 Au-Ag-Cu brazing material is used to provide a corrosion resistance required for a wristwatch case. After brazing the welding target 24 to the watch body 20, the outer surfaces of the watch body 20 are grinded for providing the final configuration. Thereafter, the band end link 22, consisting of stainless steel (AIRS1 316) and having a projection 22a at two locations, is joined to the welding target 24 of the watch body 20 by projection welding.
Fig. 4 shows the band end link 22 shown in
Fig. 3. The projections 22a are formed on the joint surface 22b of the band end link 22 by press machining and each have a cylindrical configuration having a diameter of 0.5 mm and a height of 0.1 mm.
The projection welding for jointing the band end link 22 and the watch body 20 is camed out under the following conditions: Using a threephase rectified power supply; Supplying a current of 1.8 KA (conduction time of 0.06 sec); and
Applying a pressure of 26 kg.
When the watch case comprising the aforesaid watch body 20 and band end link 22 is supported at both ends and is applied a pressing force to a center thereof, as shown in Fig. 4, the watch case can bear the pressure of 70 kg. Thus, this watch case exhibits a sufficient strength needed for the wristwatch.
As to the surface treatment of the welded band end link 22, it is possible to apply gold plating without causing any loss of strength of discoloration. With regard to the gas-phase plating of titanium nitride (TiN), however, it is necessary to prevent the TiN layer from forming on the projection portions 22a for obtaining a joint of sufficient strength.
The material of the welding target 24 is one of
Inconel (RTM) and Hastelloy (RTM), which excel in corrosion resistance, besides pure Ti. Further, a coefficient of expansion of stainless steel (NISI 31 6) is different from that of the cemented carbide material. Accordingly, it may be necessary to form a Nickel (Ni)-pailadium(Pd) layer having a thickness of 5 to 10y on the surfaces of both the watch body 20 and the band end link 22 comprising stainless steel (AISI 316) Ni-Pd plating. Further, sufficient care may be taken with regard to the cooling temperature during the brazing operation.
Fig. 6 shows a second embodiment of the present invention. In Fig. 6, a watch body 30 comprising the cemented carbide alloy and has a transverse hole 30a for a winding stem and a circular stepping portion 30b. A welding target 34 has a ring-shapped configuration, and is brazed into the circular stepped portion 30b of the watch body 30 by a method similar to that used in the first embodiment. This welding target 34 comprises pure Ti.
The winding stem pipe 32 has a ring projection 32a and is welded to the welding target 34 with a welding peak current of 1.8 KA, a conduction time of 0.04 sec, and an applied pressure of 15 kg.
The strength of the jointed portion was of a
satisfactory value even when the strength of the joint was measured after CASS test. The
conditions for the CASS test are as follows:
(Same conditions as Japanese Industrial
Standards D0201)
(1) Liquid composition
sodium chloride (NaCI) 50 g/liter
copper chloride (II) (CuC12) 0.26 g/liter
acetic acid (CH3COOH) 1-3 ml/liter
Acetic acid is applied to the liquid of NaCI
and CuCl2for controlling a value of pH, from
3.0 to 3.1.
(2) The liquid (1) is sprayed toward the sheet in
a test bath at a value of pressure 1 kg/cm2.
(3) Temperature in the test bath 350C.
(4) rime Spraying (2) is continued for 150
hours.
Fig. 7 shows a third embodiment of the present invention; A watch body 40 comprises a stainless steel and has projections 40a at four locations of its joint surface 40b. A bezel 42 comprises a cemented carbide alloy and has recesses 42a provided at the positions of the bottom surface 42b, corresponding to the projections 40a of the watch body 40. As shown in Fig. 8, a welding target 44 consisting of stainless steel (Al Sl 31 6) is provided into the recesses 42a of the bezel 42 at four locations by brazing using a method similar to that employed in the first embodiment.
These targets 44 are welded to the projections 40a of the watch body 40. This welding conditions are a welding current of 2.0 KA, a conduction time of 0.04 sec, and an applied pressure of 30 kg. The strength of the jointed portion was 65 kg.
Fig. 9 shows a fourth embodiment of the present invention. A watch body 50 comprises a cemented carbide alloy and has a recess 50a provided on its outer surface 50b. A welding target 52 consists of stainless steel (AISI 31 6L) and has a welding projection 52a. This welding target 52 is brazed into the recess 50a of the watch body 50 by a method similar to that used in the first embodiment. A decoration 54 consists of 18 K gold and is welded to the welding target 52.
This welding conditions are a welding current of 1.0 KA, a conduction time of 0.02 sec and an applied pressure of 10 kg. Further, an electrode having a 20 um silver plating is used. The strength of the jointed portion was 10 kg.
The present invention excels in joint strength and involves little risk of change with time in comparison with a joint achieved by an organic bonding agent as used in the prior art.
Claims (9)
1. A joint structure of a watch body and an auxiliary part, comprising:
a watch body having a joint portion;
an auxiliary part having a joint portion; and
a welding target provided to one of said joint
portions;
wherein said auxiliary part is welded to said
watch body through said welding target.
2. A joint structure of a watch body and an auxiliary part according to claim 1 , wherein said watch body comprises a cemented carbide material.
3. A joint structure of a watch body and an auxiliary part according to claim 2, wherein said welding target is provided to said watch body, and wherein said auxiliary part has at least one projection on its joint portion, said projection being welded to said welding target.
4. A joint structure of a watch body and an auxiliary part according to claim 3, wherein said welding target is brazed to said watch body.
5. A joint structure of a watch body and an auxiliary part according to claim 1, wherein said auxiliary part comprises a cemented carbide material.
6. A joint structure of a watch body and an auxiliary part according to claim 5, wherein said welding target is provided to said auxiliary part, and wherein said watch body has at least one projection on its joint portion, said projection being welded to said welding target.
7. A joint structure of a watch body and an auxiliary part according to claim 6, wherein said welding target is brazed to said auxiliary part.
8. A joint structure of a watch body and an auxiliary part according to claim 2, wherein said welding target is provided to said watch body and has a projection welded to the welding portion of said auxiliary part.
9. A joint structure of a watch body and an auxiliary part substantially as shown and described with reference to Figs. 3, 4 and 6 to 9 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP80483A JPS59126283A (en) | 1983-01-07 | 1983-01-07 | Exterior structure of wristwatch |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8400311D0 GB8400311D0 (en) | 1984-02-08 |
| GB2134025A true GB2134025A (en) | 1984-08-08 |
| GB2134025B GB2134025B (en) | 1986-05-29 |
Family
ID=11483866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08400311A Expired GB2134025B (en) | 1983-01-07 | 1984-01-06 | Joint structure of watch body and auxiliary part |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS59126283A (en) |
| GB (1) | GB2134025B (en) |
| HK (1) | HK88290A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1548524B1 (en) * | 2003-12-23 | 2007-08-22 | Rolex S.A. | Ceramic element for watch case and method of manufacturing the same |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB566698A (en) * | 1943-06-22 | 1945-01-10 | Kapella Ltd | Improvements in or relating to bezel stops for lenses |
| GB739492A (en) * | 1953-03-17 | 1955-11-02 | Rolls Royce | Improvements in projection welding |
| GB910016A (en) * | 1959-10-30 | 1962-11-07 | Westinghouse Electric Corp | Sealed electrical devices with welded hermetic joints |
| GB1338246A (en) * | 1969-12-01 | 1973-11-21 | Trw Inc | Method of securing a member to a metallic support |
| GB1343875A (en) * | 1972-06-28 | 1974-01-16 | Ford Motor Co | Method of making a shaft assembly |
| GB2076328A (en) * | 1980-04-22 | 1981-12-02 | Citizen Watch Co Ltd | Welded joint of bezel and watch body |
| GB2076329A (en) * | 1980-04-24 | 1981-12-02 | Citizen Watch Co Ltd | Joint structure of bezel and watch body |
| GB2123330A (en) * | 1982-05-06 | 1984-02-01 | Citizen Watch Co Ltd | Method of making a watchcase |
-
1983
- 1983-01-07 JP JP80483A patent/JPS59126283A/en active Pending
-
1984
- 1984-01-06 GB GB08400311A patent/GB2134025B/en not_active Expired
-
1990
- 1990-10-25 HK HK88290A patent/HK88290A/en not_active IP Right Cessation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB566698A (en) * | 1943-06-22 | 1945-01-10 | Kapella Ltd | Improvements in or relating to bezel stops for lenses |
| GB739492A (en) * | 1953-03-17 | 1955-11-02 | Rolls Royce | Improvements in projection welding |
| GB910016A (en) * | 1959-10-30 | 1962-11-07 | Westinghouse Electric Corp | Sealed electrical devices with welded hermetic joints |
| GB1338246A (en) * | 1969-12-01 | 1973-11-21 | Trw Inc | Method of securing a member to a metallic support |
| GB1343875A (en) * | 1972-06-28 | 1974-01-16 | Ford Motor Co | Method of making a shaft assembly |
| GB2076328A (en) * | 1980-04-22 | 1981-12-02 | Citizen Watch Co Ltd | Welded joint of bezel and watch body |
| GB2076329A (en) * | 1980-04-24 | 1981-12-02 | Citizen Watch Co Ltd | Joint structure of bezel and watch body |
| GB2123330A (en) * | 1982-05-06 | 1984-02-01 | Citizen Watch Co Ltd | Method of making a watchcase |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2134025B (en) | 1986-05-29 |
| JPS59126283A (en) | 1984-07-20 |
| HK88290A (en) | 1990-11-02 |
| GB8400311D0 (en) | 1984-02-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970106 |