| 摘要 |
PROBLEM TO BE SOLVED: To provide an actuator that resolves a load change to be generated before and after an operation of the actuator using a SMA (shape memory alloy), and to be received by the SMA from a twisted coil spring.SOLUTION: An actuator A comprises: a lever 3; a SMA (shape memory alloy)4; and a twisted coil spring 9, in which the lever 3 has protrusion parts 3c and 3d coaxial with a rotary shaft, an intermediate part 4d of the SMA4 is wound around circumferential faces of the protrusion parts 3c and 3d, and both end parts 4a and 4c thereof are fixed to a base 1. Contraction of the SMA4 causes the lever 3 to rotate centering around a shaft hole 3b, and after the lever 3 is rotated, the twisted coil spring 9 causes the lever 3 to return to a state before rotated. The SMA4 is wound around the protrusion parts 3c and 3d, which makes the actuator A operable without changing a direction of a load F to be received from the twisted coil spring 9 before and after the rotation of the lever 3.SELECTED DRAWING: Figure 2 |
