| 摘要 |
PURPOSE:To aim at the promotion of sharp reduction in a space for assemblage to various devices, by utilizing the expansion and contraction of a form memory alloy wire guided by a guide tube, while dispensing with the space required for three-dimensional or plane form variations in the alloy wire heretofore in use. CONSTITUTION:When a form memory alloy wire 12 is energized with a continuous rating current and heated with a switch turned on, this alloy wire 12 tries to be restored to its memory form, but since the form is restrained by a guide tube 11, it contracts as far as the whole length as leaving its form almost unchanged intact. Therefore, a bias spring 21 is stretched out, and an actuator 19 comes to a backward position (left). Next, stopping the energizing and heating by the current with the switch 23 turned off, when an on-off valve 25 is opened and compressed air is passed through the inside of the guide tube 11, the alloy wire is quickly cooled, losing its contracting force, and stretched out by tension of the bias spring 21 whereby the actuator 19 goes back to a forward position. With repetitions of the above motion, as an actuator it quickly acts, and it has flexibility so that assemblage to various devices is convenient enough and, what is more, the space also is reducible. |
