| 摘要 |
A fire sprinkler head suitable for mounting in a concealed location in the ceiling in a room in a residential dwelling is provided which provides quick and automatic response in the event of a fire. The valve assembly in the sprinkler head is biased to the open mode by means of a positive force, in addition to the force of the fire extinguishing fluid. Nevertheless, the valve assembly is maintained in the closed mode by the valve locking mechanism of the invention until the onset of a fire and the attainment of a predetermined ambient temperature, at which time the locking mechanism is made inoperative. The locking mechanism is maintained in the operative mode until the temperature of the fire melts a heat fusible alloy composition, at which time the locking mechanism or keeper becomes inoperative.
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