FIELD: building engineering. SUBSTANCE: shutters to be installed in a slanting roof have profile plates attached to the lateral members of the window frame containing tracks guiding the lower plate of the curtain. Load created at least by one spiral spring which draws the lower plate into the lowered position influences it. The coagulated part of the spring is disposed in the casing on one end of the lower plate. The axle of the spring rotation is in fact parallel to the longitudinal axle of the lower plate. The unfolded part is placed in one of the profile plates and is attached to the lower end of this plate at the lower edge of the window. EFFECT: improved protection devices for windows. 1 cl, 4 dwg
