WARPAGE PREVENTING STRUCTURE AND WARPAGE PREVENTIVE TOOL OF DOOR AT TIME OF FIRE

摘要

PURPOSE: To prevent the warpage of a door, and to obviate a spreading fire by elongaging a shape memory alloy member by the heating of a fire, forward moving a movable member on the door side into the recessed section of a frame section against the force of an energizing member and automatically connecting the movable member on the door side to the recessed section of the frame section. ;CONSTITUTION: When a fire is generated and a temperature in a first instrument 2 buried to the upper section of the stile section 10 of a door 1 reaches the austenite transformation end temperature of a shape memory alloy member 22, the shape memory alloy member 22 is restored to a mother phase, and a movable member 21 is pushed out from an opening section 23 against the force of a biassed spring-shaped energizing member 25. The movable member 21 is intruded into the recessed section 30 of an opposed vertical frame section 11, the vertical frame section 11 is connected to the door 1, and the door 1 is locked automatically. Accordingly, an upper section, on which a warpage preventive tool 2a is mounted, is not warped in the door 1, and the intrusion of the flame is prevented, thus obviating a spreading fire. When the fire is 7 extinguished and a temperature in a case 20 lowers, the shape memory alloy member 22 is softened, and the movable member 21 is returned to an original place by the energizing member 25.;COPYRIGHT: (C)1995,JPO