| 主权项 |
1. Actuator (10; 110; 120; 130; 180; 190; 3000):
comprising at least one shape-memory-alloy based converter (11; 1811; 100, 101, 102, 103) in a housing (14; 197; 3004) and at least one preload spring (12; 3; 3009); and configured to cause a motion of at least one movable member (13; 198; 3002)
in a first direction, upon the at least one converter (11; 1811; 100, 101, 102, 103) undergoing thermally induced phase transition which makes it contracted, andin a second direction that is opposite to the first direction, upon the at least one converter (11; 1811; 100, 101, 102, 103) undergoing phase transition caused by temperature change and enhanced by the preload spring (12; 3; 3009) which makes the converter (11; 1811; 100, 101, 102, 103) elongated;characterized byfurther comprising a rod (3007) connecting to the said movable member (3002) and to a spring (3009), wherein the spring is one of a compression spring stack (3009) placed around the rod (3007) and a tension spring connecting to the end of the rod;and wherein the rod (3007) is pulled to the optimal prestress for the converter such that a fixation part (3008) is addable. |
