FIELD: automatic fire-fighting equipment. SUBSTANCE: thermal lock has locking bar made from fragile material and heat-sensitive plate made from material having shape memory effect. Length of plate is extending perpendicular to bar axis and width of plate is positioned at an angle to bar axis. Support ends of plate are positioned at one side of sprinkler-type sprayer and middle part of plate side face contacting with bar is positioned at other side of sprayer. Such arrangement of heat-sensitive plate with respect to fragile bar allows force acting in transverse and longitudinal directions for restoring initial shape to be effectively used. EFFECT: enhanced reliability in operation and increased efficiency. 3 dwg
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