Patent ID: 8826997

Claim:
A fire sprinkler comprising: a generally tubular body having an inlet end and an outlet end, the body defining a fluid flow passage extending therethrough between the inlet end and the outlet end such that outlet end is in fluid flow communication with inlet end; a magnetized member disposed within fluid flow passage and movable between a first position wherein fluid flow communication between the outlet end and the inlet end is blocked and a second position wherein fluid flow communication between the outlet end and the inlet end is open; and a temperature sensitive magnetic member coupled to the body and having sufficient magnetic properties to attract the magnetized member below a predetermined temperature, thereby maintaining the magnetized member in the first position, the temperature sensitive magnetic member losing a sufficient percentage of its magnetic properties at and above the predetermined temperature, thereby allowing the magnetized member to move to the second position, wherein the temperature sensitive magnetic member is provided in the form of a sealing ring that is located exterior of the body of the fire sprinkler and is positioned over a threaded connection of the fire sprinkler for securing the fire sprinkler to an upstream water supply.