Link 1, turning about fixed axis A, is connected by a sliding pair to link 3 which slides in link 4. Link 4 is connected by turning pair B to link 2 which slides in fixed guides p-p. Extension a of link 2 has its axis perpendicular to the axis of guides p-p in which link 2 slides. Extension a is connected by a sliding pair to slider 5 . Link 3 is connected by turning pair K to slider 5 . When link 1 turns about axis A, point K describes a parabola with the equation y²=2px, where 2p is the distance from point B to the axis of extension a of link 2.
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