Sprinklers with shape-memory alloy actuators
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United States of America Patent
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Feb 27, 1996
Grant Date -
N/A
app pub date -
Feb 1, 1994
filing date -
Feb 1, 1994
priority date (Note) -
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Abstract
An automatic sprinkler includes a sprinkler body having a fluid passage outlet. A valve plug is maintained in sealing engagement with the fluid passage outlet by one or more control levers which react against the sprinkler body. Each control lever is held in position by a temperature-responsive actuator made from a generally C-shaped band of shape-memory alloy. The control band may be rigidly secured to one of the control levers. Upon an occurrence of a high-temperature condition, opposed ends of the control band spread apart in a common plane, releasing all control levers thereby permitting all control levers to pivot relative to the sprinkler body and release the valve plug from sealing engagement with the fluid passage outlet.
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