| 摘要 |
PCT No. PCT/GB90/00579 Sec. 371 Date Dec. 9, 1991 Sec. 102(e) Date Dec. 9, 1991 PCT Filed Apr. 17, 1990 PCT Pub. No. WO90/13171 PCT Pub. Date Nov. 1, 1990.A linear actuator comprising of two elongate resilient elements (10, 12) joined together at their opposite ends (13, 14), a first one of the elements is fixed at a point intermediate its ends (16) and the two elements (10, 12) are arranged to carry an electric current which causes the two elements (10, 12) to move apart when they are placed in a transverse magnetic field. The linear actuator may be used to control the opening and closing of a valve in a fluid dispensing device, where a needle (20) is attached to the second element (12), which needle co-operates with a valve orifice.
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