Spring hinge for hairstyling devices

A hairstyling device including:

• a first jaw and a second jaw, hinged together by hinge means allowing them to pivot about a hinge axis between a spread apart position and a close together position, with two opening levers extending respective jaws beyond said hinge axis,
• an elastically flexible wire spring wound in a helix around said hinge axis and having first and second radially projecting ends respectively adapted to bias said first jaw and said second jaw relative to each other towards one of said spread apart or close together positions,
• said hinge means comprising, on said first jaw, two parallel first perforated lugs spaced apart by a distance for stability, and, on said second jaw, two parallel second perforated lugs spaced from each other appropriately to engage with respective opposite sides of said first perforated lugs, with a connecting spindle oriented along said hinge axis and passing through said four perforated lugs to connect said jaws,
• wherein, on at least a visible rear face between said opening levers, said spring is accommodated behind at least one concealing wall which is fixed to said first jaw, conceals the gap between said first two perforated lugs, and is shaped to escape from said second jaw upon relative rotation between said spread apart and close together positions,
• wherein said spring is made from a metal wire having a diameter greater than or equal to 0.9 mm, and wound in at least six turns,
• wherein said first end of said spring is concealed by said concealing wall, and
• wherein said second end of said spring is engaged in a housing in an inside face of said second jaw in an internal area between said first perforated lugs.