| 摘要 |
A linear actuator comprises two solenoid arrangements, each with a coil 2 and a resiliently biased armature. An elongate member 1 extends through the armatures and each armature is formed from two separate parts 3, 4. The armature parts 3, 4 are arranged to provide a clasping grip and linear movement action upon the elongate member 1 when its associated solenoid coil 2 is energised. When the said solenoid coil 2 is de-energised the armature parts 3, 4 release their grip and are returned along the elongate member 1 by resilient means 11. The armature parts 3, 4 may comprise cylindrical and semi-cylindrical portions and non-magnetic portions 6. The non-magnetic portions are used to separate the armature parts 3, 4 to ensure a good clasping grip. |
