Extensible clasp for bracelet of wrist-watch strap or necklace, has closing elements equipped with coupling units, where end of cable is rolled on pulley positioned in one of closing elements

摘要

The clasp has closing element (9) equipped with coupling units (5, 6) for coupling the closing element. An end of a connecting cable (1) is fixed to the closing element or rolled on a pulley (4) of a crank. Another end of the cable is rolled on the pulley positioned in another closing element. The pulley comprises a spring allowing returning and rolling of the cable on the pulley, where the pulley comprises a manual winder actuated using the crank to roll the cable. The spring is tightened by a blocking system during opening of a bracelet (8) and unlocked by a push rod (3).