Nut 3 travels along screw 1. Link 4 slides in the guide of nut 3. Rotation of screw 1 is transmitted through bevel gears 5 and 6 to screw 2 along which nut 7 travels. Nut 7 is connected by a turning pair to slider 8. Link 4 is connected by turning pair K to slider 9. Sliders 8 and 9 move along the axis of link 10 which turns about fixed axis 0. When crank handle 11 of screw 1 is rotated, point K of slider 9 describes portion q of a parabola with the equation y=(1/k)x² where k is the distance from the axis of screw 2 to the origin of coordinates.
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