Plastic watch casing with plastic crystal and process for joining the crystal to the casing
US4558957A · kind A · utility
23Cited by
4References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1983 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Aug 12, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1043
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
To simplify fitting and sealing the crystal (4) to the casing (2, 6, 8), assembly is effected by means of ultrasonic welding. The casing (2, 6, 8) and the crystal (4) are made of synthetic materials which are thermo-weldable to each other. The mating faces (8a, 4b) of the peripheral wall (8) of the casing and the crystal (4) are formed for reducing the contact area between the two parts to permit thermo-welding by subjecting the assembly to high-frequency mechanical vibrations imparted by a tool (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.