Security grille with circular-section bars - has tapered and flanged ends of bars resisting pulling out from hollow-section frames when bars are bent

摘要

The security grating or grille has round-section bars (1) supported at the ends in hollow square- or rectangular-section frame members (2). The holes (4) through the frame members are inwardly flanged. The fame members fit closely inside outer casing tubes (12) with plain holes. The ends of each bar are cut with a tapered portion (7) with a flange (8) at the end of the full dia. of the bar. These ends resist pulling out od the bar ends from the frame members as the flanges (8) catch on the flanged ends of the bars. USE/ADVANTAGE - Security bar grille with increased resistance to pulling out of the ends of the bars if they are bent.