Timepiece external part and method of manufacturing the part
US6935774B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2002 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Sep 12, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B37/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A wristwatch case (11) and a method of manufacturing the case, the wristwatch case comprising a wristwatch case body (1) made of titanium or stainless steel and a crown pipe (3) fixed to each other, wherein a stem hole (2) corresponding to the crown pipe (3) is formed in the wristwatch case body (1), a small diameter part is formed in the crown pipe (3), and a small diameter part corresponding to the a small diameter part of the crown pipe is formed in the stem hole (2), the method comprising the step of fitting the crown pipe (3) into the stem hole (2) in the wristwatch case body (1) to form a solid phase diffusion joining part at a portion where the small diameter parts thereof are fitted closely to each other, and to form a brazed connection part at a portion other than that where the small diameter parts are fitted closely to each other, whereby a watch external part having excellent corrosion resistance and waterproof and a large number of design variations can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.