Patent ID: 6073700
Filing Date: 2000-06-13
Classification: A62C

Abstract:
A closed type sprinkler head for discharging fire extinguishing water in a fire, comprising a valve mechanism for switching the channel of the fire extinguishing water, connected to a fire extinguishing piping filled with the fire extinguishing water supplied with pressure,wherein a first heat sensitive operation part where a shape-memory alloy and a restoring force member are arranged facing to each other so that the shape-memory alloy is deformed to an initial shape by the restoring force member so as to maintain a valve mechanism at a water discharge stopping position when the temperature of the shape-memory alloy is lower than a predetermined memory restoring temperature, and the valve mechanism can be driven to a water discharging position by the restoring force of the shape-memory alloy to a memorized shape when the temperature of the shape-memory alloy reaches the memory restoring temperature, anda second heat sensitive operation part where a predetermined water discharge starting temperature higher than the memory restoring temperature is set so that the valve mechanism is maintained in a closed state regardless of the operation state of the first heat sensitive operation part when the temperature is lower than the water discharge starting temperature, and the closure of the valve mechanism is released so as to discharge fire extinguishing water by thermally disassembling itself at least partially when the temperature reaches the water discharge starting temperature are provided.