Abstract: The present application relates to a stepwise discrete actuator (10) with two shape memory alloy wires (15, 15?) used in an antagonistic configuration to drive a slider (13) that moves a toothed element (12) through tooth-engaging fingers (131, 132) that are spaced at rest by a distance F that is shorter than the distance T between adjacent teeth by an amount sufficient for a stationary finger lifter (14) to lift that of the slider fingers (131, 132) that does not engage the movable toothed element (12) such that it clears the teeth of the latter.

Abstract: The present invention is inherent to a swing-type Shape Memory Alloy (SMA) actuator (10) comprising a stationary frame (11) and a swingable part (12) that are coupled by means of a pivot (13) allowing the swing of the swingable part (12), two SMA wires (14, 14?) being engaged to two connecting elements (15, 15?) present respectively on a left and right portion of the swingable part (12) and vertically separated from the pivot (13), such that the activation of one of the SMA wires (14, 14?) causes the swing of the swingable part (12) in either the clockwise or counter-clockwise direction.