Protecting and locking interchangeable working parts of watch, e.g. for sporting activities involving extreme exposure to elements

摘要

The interchangeable working part of the watch and its container (1) is enclosed within a protective case (7) which reveals only the indicating dial and the winding mechanism (4). The joint between the crown and the spindle sleeve is made watertight by jointing rings (8,9). A nut (6) is added to ensure firm location to the protective case when locked. The nut enables visual indication (10) of correct locking.