Safety key and rotary disc lock combination, has entrants formed along shaft of key and engageable to complementary projections formed within circular hollow central parts of spaced apart rotary discs

摘要

Entrants, formed along the shaft of a key, are engageable into complementary projections formed within the circular hollow central parts of spaced apart rotary discs. The projections are also disposed symmetrically with respect to the path of the key shaft. Furthermore, the shank end forms bevels. Each bevel has a length greater than the spacing between each pair of discs.