Method for making grille, e.g. gate, consisting of tubular bars connected by hollow cross-bar comprises fitting bars into bores in cross-bar and forming outwardly-projecting collars which fit inside upper and lower walls of cross-bar

摘要

The method for making a grille consisting of tubular bars (2) connected by a hollow cross-bar (1) comprises fitting the bars into bores in the cross-bar and forming outwardly-projecting collars (7) which fit inside the upper (5) and lower (6) walls of the cross-bar.