método para formação de estruturas de ligação entre a coluna e a parte de assento para cadeiras de escritório, e estrutura de ligação entre a coluna e a parte de assento em uma cadeira de escritório

摘要

A method of forming a connecting structure between column and seating portion of an office chair includes the steps of forming a frusto-conical portion having a flange by cold-pressing a portion of sheet metal, inserting the flanged portion into a mold reproducing the shape of the structure, injecting plastic material into the mold and incorporating the flanged portion of the frusto-conical portion into the plastic material.