Armour for roller-shutter with hooked bars - has small top hook of each bar half width of large bottom one with each extending through no more than semicircle

摘要

In the transverse direction of each bar (10), the width of the small top hook portion (14) is between half and two-thirds that (18) of the large bottom one (15). Each portion extends through no more than 180 deg. The edge (14c) of the top portion is on the bar centre line (L1), while that (15e) of the bottom portion is on the centre line (L2) of the top one. When suspended in the vertical position, the hook portions of adjacent bars can be arranged to bear against each other via their inside surfaces. USE/ADVANTAGE - For sliding doors, revolving shutters or roller blind etc. Improved wind resistance and less noisy in use.