Actuator

Details Actuator Actuator

2006-10-10

2010-06-29

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Heat or buoyancy motor actuated

C251S129060

Reexamination Certificate

active

07744058

ABSTRACT:
An actuator (12) is disclosed for example controlling gas flow in a gas turbine engine. The actuator (12) comprises a first portion (14) having shape memory properties, and a second portion (16) formed of substantially the same material as the first portion and having reduced shape memory properties relative to the first portion. The first portion (14) is movable from a first position to a second position at a temperature above the phase transition temperature of the shape memory material of the first portion (14). The second portion (16) is arranged to urge the first portion (14) from the second position to the first position at a temperature below the phase transition temperature of the shape memory material.

REFERENCES:
patent: 4400634 (1983-08-01), Micheron
patent: 4405387 (1983-09-01), Albrecht
patent: 5619177 (1997-04-01), Johnson et al.
patent: 6545384 (2003-04-01), Pelrine et al.
patent: 2005/0166575 (2005-08-01), Birch
patent: 2 024 422 (1980-01-01), None
patent: 2000356557 AB (2000-12-01), None
patent: 2001003850 AB (2001-01-01), None

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