Metal grille for ventilation and air conditioning - has frame formed by U-section vertical bars with slots and lips to locate blades

摘要

The frame is formed by vertical bars (1) with the cross section of a U. The centre piece of the U has horizontal slots at regular intervals. Supporting pieces (3) of extruded metal have profiled end sections (32) which fit into these slots. The supporting pieces are bent upwards at an angle at the ends away from the frame and terminate in outwardly bent lips (31). These lips fit into recesses formed by turned over edges (23) on the backs of the blades (2). The blades are also formed from extruded sections and are in the form of an elongated Z with vertical pieces (22) at the back and front and a sloping section (2) between them. The fixing edges (23) are on the sloping centre part.