Sprinklers with shape-memory alloy actuators

Details Sprinklers with shape-memory alloy actuators Sprinklers with shape-memory alloy actuators

1994-02-01

1996-02-27

Avila, Stephen

Fire extinguishers

Sprinkler heads

169 38, A62C 3708

Patent

active

054941130

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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Schetky, "Shape-Memory Alloys" Scientific American, vol. 241, No. 5, pp. 74-82, Nov. 1979.
Hodgson et al., "Shape Memory Alloys," Metals Handbook, vol. 2, 10th ed., Oct. 1990.

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