20120017933 | EXPANDABLE CURLER - An expandable curler is provided to facilitate hair winding, because strain imparted by the curler to the hairs no longer depends on the strain applied by the operator during winding and where possible differences in strain caused by humidity or by drying are compensated by the curler, which consequently expands or contracts itself. The curler includes a body split in two or more rigid longitudinal sectors forming together a winding surface to receive an amount of wound hairs in a contracted configuration. Locking members of the sectors are also included in the contracted configuration and an elastic member, housed inside said sectors, are configured to apply a predetermined elastic force on said sectors, expanding the winding surface and determining a strain state at the wound hairs until reaching a balance between inner elastic force and strain applied to the wound hairs, when the locking members are deactivated. | 01-26-2012 |