Intruder resistant roller shutter locking mechanism - has side protruding lugs engaging case side-piece notches when lowered

摘要

For prevention of unwarranted opening from outside the automatic securing device is fitted to a roller 1 shutter, with case ends sealed by hollow-chamber side-pieces, providing a mounting for the spindle in outer sides and with enlarged holes in inner sides. The blind sheet (20) has protruding securing lugs (20b) (50) protruding at the ends of a shingle piece (20b) running down from the spindle when lowered. These pass through the inner sides (26) of the side-pieces (24) in an angled profile slot (48), where a notch holds the lug if the sheet is pushed upwards.