| 摘要 |
<p>Procedure for the manufacture of watch cases, based on a disposable cylindrical metal container (1) that involves cutting the container cross sectionally in four portions (2 and 3), out of which the intermediate ones (3) are then diametrically cut to obtain semi-cylindrical shells (4) that are rolled up to form a spiral (5) and which are then subjected to an axial pressing procedure using a die (6-7) which shape corresponds with that of the watch case to be manufactured. A ring shaped part (8) is obtained upon which base is then mounted a crown (9) fitted with a peripheral rib (10). <IMAGE></p> |
