PROCESS FOR FORMING A CONNECTING STRUCTURE BETWEEN THE COLUMN AND SEATING PORTION OF AN OFFICE CHAIR, AND A STRUCTURE OBTAINED BY SAID PROCESS

摘要

A method for forming connecting structures between the column and seating portion for office chairs, characterised by: - forming a frusto-conical portion (8) provided with a flange (24, 26, 28) by cold-pressing a portion of sheet metal, - inserting said flanged portion into a mould (32) reproducing the shape of the structure, - injecting plastic material into the mould in such a manner as to incorporate the flanged portion (24, 26, 28) of said frusto-conical portion (8) into the plastic material.