Case for packaging e.g. make-up powder, has semi-hinge with longitudinal connection part which has helical spring with predetermined angular torsion transferring preset opening torque to cover during unlocking of cover, to open case

摘要

The case has a hinge (4) with left and right semi-hinges (40, 43). The semi-hinge (43) has a rigid longitudinal connection part (6) with a helical spring (60) cooperating in rotation with two opposite semi-portions of the hinge (43) using two integration units. The spring has a predetermined angular torsion transferring predetermined opening torque to a cover (2) during unlocking of the cover, to open the case. An independent claim is also included for a method of manufacturing a case.