Method for the production of bodies in plastic material comprising at least two portions hinged to each other by a single rotation pin

Method for the production of bodies in plastic material comprising at least two portions hinged to each other by a single rotation pin extending along a hinge axis, said method comprising the following steps:

• a) predisposing a mold provided with at least two distinct forming chambers for forming said two portions, said chambers being shaped so that said two portions are formed already positioned in a position of reciprocal coupling, said mold comprising a third forming chamber for forming said single pin, said third chamber being made in such a way that said pin is formed aligned along the hinge axis, said mold being provided with a pair of pegs which are slidable along said hinge axis between a first and a second operating position, said pegs having a distance therebetween forming said third chamber, in said first operating position a first peg operating as a core to define hinging seats in said two portions and in said second operating position a second peg operating as a pusher for said single pin inside said seats;
• b) positioning said pegs in said first operating position;
• c) injecting plastic material inside said forming chambers;
• d) shifting said pegs from said first to said second operating position, bringing said pin to engage inside said seats thereby creating a hinge between said two portions;
• and
• e) opening said mold and extracting said two portions hinged to each other by said single pin.