SHUTTER FOR CLOSING OPENING Russian patent published in 1994 - IPC

FIELD: construction. SUBSTANCE: shutter has flexible fabric 1 with members 2 for providing lateral rigidity. Each member is made of a pair of angles received one within another. Fabric 1 is interposed between the angles. The ends of the angles are provided with threaded clamps 5. Fabric 1 is made of a pack of horizontally arranged flexible belts. Edges of adjacent belts is secured overlap between the angles. Shelves of the angle of top member 2 of lateral rigidity is welded to drum 10. A weight made of a plate and used for providing vertical position of fabric 1 is welded to shelves of the angle of bottom member 2 of lateral rigidity. The ends of the angles with clamps 5 are received in grooves of box 12 of the opening. Drum 10 with a drive is set on a cover of a shot-blasting chamber. EFFECT: improved design. 3 cl, 7 dwg